A Practical Legal Article on What May Be Sold, What Cannot Be Sold, and How These Transactions Are Usually Done

In the Philippines, inherited land is often dealt with long before a new title is issued in the names of the heirs. This is common in estates where the original owner has died, the family has not yet completed settlement proceedings, estate taxes and transfer requirements remain unfinished, and the property still appears in the name of the deceased under the old Transfer Certificate of Title, Original Certificate of Title, tax declaration, or even only informal land records.

Because of this, many families ask the same question: can an heir sell inherited land rights even without a title already transferred to the heir’s name?

The accurate answer is: yes, in many cases what may be sold is not yet full registered ownership in the strict land-registration sense, but the heir’s hereditary rights, participation, interest, or adjudicated share in the property. That answer, however, is only the beginning. The legality, enforceability, and risk level of the transaction depend on several facts, especially these:

whether the decedent left a will or none,
whether the estate has already been settled,
whether there is one heir or several heirs,
whether the property is titled, untitled, or only declared for tax purposes,
whether there are creditors,
whether there is already an extrajudicial settlement, partition, or deed of adjudication,
whether the seller is transferring a definite physical portion of land or only an undivided hereditary share,
whether all compulsory heirs consent,
whether the buyer understands that a sale of “rights” is not the same as a clean transfer of titled ownership.

This article explains the Philippine legal framework and the practical consequences of selling inherited land rights without title.

I. The Basic Rule: An Heir May Have Rights Even Before Title Is Transferred

Under Philippine succession law, the rights to the estate of a deceased person pass to the heirs by operation of law upon death, subject to administration, liquidation of debts, taxes, and partition. This is why an heir may already possess a legally recognizable interest in inherited property even if:

the property is still titled in the decedent’s name,
no estate settlement has yet been completed,
no transfer certificate of title has yet been issued to the heirs.

This distinction is essential.

There is a difference between:

ownership of a specific, segregated lot already titled in the seller’s name, and
the heir’s hereditary rights or undivided interest in the estate or in a particular estate property.

When there is no transferred title yet, the seller usually does not sell a fully individualized titled parcel in the ordinary sense. What is more commonly sold is:

hereditary rights,
ideal or undivided share,
participation in the estate,
rights and interests over a property adjudicated to the heir,
possessory rights, where applicable,
expected share subject to settlement and partition.

That is why Philippine documents in these situations are often called:

Deed of Sale of Rights and Interests
Assignment of Hereditary Rights
Deed of Assignment
Waiver/Assignment of Hereditary Share
Sale of Undivided Share
Deed of Extrajudicial Settlement with Sale

The correct form depends on the stage of the estate.

II. What “Without Title” Usually Means

In practice, “without title” in the Philippines can refer to several different situations. Each one has different legal consequences.

1. The land has a title, but it is still in the name of the deceased

This is the most common case. The property is titled, but the heirs have not yet transferred the title to themselves.

In this situation, the heirs may still transfer their hereditary rights or shares, but the buyer does not instantly get a clean new title merely because of the sale. The estate first has to be properly settled, taxes and documentary requirements complied with, and the title eventually transferred.

2. The heirs have no separate title yet because the estate is undivided

If several heirs inherited the property together and no partition has happened yet, each heir normally holds only an undivided ideal share, not a definite metes-and-bounds portion. One heir may usually sell only that heir’s undivided interest, not a specific corner or exact area unless there has already been a valid partition.

3. The property is untitled land

This is riskier. There may be no Torrens title at all, only tax declarations, survey records, possession, or old muniments of title. In such a case, what is being sold may be possession, claim, and whatever rights the heirs inherited from the decedent. This does not guarantee registrable ownership.

4. The property is only covered by tax declarations

A tax declaration is not a title. It may be evidence of claim, possession, or an indicium of ownership, but by itself it is not conclusive proof of ownership. A sale based only on tax declarations requires extra caution.

5. There is no document of settlement yet

The heirs may still have hereditary rights, but if there is no extrajudicial settlement, no probate, no partition, and no adjudication, the buyer is stepping into an incomplete estate situation and inherits its legal complications.

III. Can an Heir Sell Inherited Land Before Partition?

Yes, but with an important limitation.

Before partition, an heir generally has rights over the inheritance but not over a specific, concrete, physically separated portion unless and until partition is made. In simple terms:

the heir may sell his or her share, rights, or interest,
but the heir cannot unilaterally and validly sell a specific exact part of the land as though it already exclusively belongs to that heir, unless such specific part has already been allotted to that heir by valid partition or adjudication.

This is one of the most misunderstood points in real estate transactions involving inherited property.

Example

A father dies leaving a 3,000-square-meter titled lot to three children. No estate settlement has been done. One child sells “the front 1,000 square meters” to a buyer.

Legally, that child may have rights in the inheritance, but unless that front 1,000 square meters was already validly allotted to that child by partition, what that child really owns at that stage is only an undivided hereditary share, not necessarily that exact front portion. The buyer may later discover that the actual partition does not award that exact area to the seller.

This is why many disputes arise when heirs sell “specific portions” of inherited property before partition.

IV. Sale of Hereditary Rights vs. Sale of Ownership of Land

These are not the same transaction.

A. Sale of hereditary rights

This means the heir transfers whatever rights, interests, and participation the heir has in the estate or in a particular inherited property.

The buyer acquires:

the seller-heir’s rights,
subject to estate settlement,
subject to debts of the estate,
subject to the shares of co-heirs,
subject to partition,
subject to defects in the decedent’s title,
subject to taxes and transfer requirements.

The buyer may eventually become entitled to whatever portion is lawfully allocated to the seller’s share.

B. Sale of land ownership

This means the seller is transferring ownership over an identified property that the seller already owns and can validly convey.

That is the cleaner transaction. It usually requires that:

the estate has already been settled,
the property has already been adjudicated or partitioned,
the seller’s ownership over the specific property or specific portion is established,
transfer documents are complete,
the title can be transferred.

Where there is still no title in the heir’s name, many transactions advertised as a “sale of land” are, in strict legal effect, closer to a sale of rights.

V. When the Estate Has Not Yet Been Settled

This is the most delicate stage.

If the owner died and the estate is still unsettled, the heirs may have successional rights, but the estate itself may still be answerable for:

debts of the deceased,
expenses of administration,
estate taxes,
claims of omitted heirs,
claims of illegitimate children, spouse, legitimate descendants, ascendants, or other compulsory heirs,
defects in title,
boundary issues,
adverse claims.

A buyer who purchases from just one heir before settlement is not buying a guaranteed clean title. The buyer is buying into an estate situation.

Effect of sale by one heir

If there are multiple heirs and one heir sells, the buyer usually acquires only whatever rights that selling heir could lawfully transfer. The buyer does not automatically become owner of the whole property.

Effect on co-heirs

Co-heirs are not automatically bound beyond the rights of the selling heir. One heir cannot dispose of shares belonging to others without authority.

Estate creditors and unpaid obligations

Even a valid hereditary right may be subject to liquidation of the estate first. The estate’s obligations may reduce what remains for the heirs.

VI. When There Is an Extrajudicial Settlement

In the Philippines, if the decedent left no will, no debts, and the heirs are all of age or properly represented, the estate may often be settled through extrajudicial settlement, subject to legal requirements.

This document is crucial in inherited-property sales because it can:

identify all heirs,
identify the estate properties,
declare partition or adjudication,
serve as the basis for later transfer with government offices and the Registry of Deeds,
clarify whether the heirs remain co-owners or whether specific properties have been allotted.

Why it matters

A buyer is in a much stronger position where there is already a proper extrajudicial settlement than where there is only a verbal family understanding.

But caution remains

Even an extrajudicial settlement is not magically immune from challenge. Problems may still arise if:

an heir was omitted,
the statement that there were no debts was false,
a compulsory heir was excluded,
signatures are defective or forged,
publication requirements were not properly met,
the seller sold more than what was allotted.

VII. The Special Case of Sole Heir

Where there is only one heir, the situation is usually easier.

A sole heir may execute a deed of self-adjudication or similar instrument, subject to the legal requirements for settlement of the estate. If validly executed and processed, this can become the basis for transferring title.

If the sole heir sells before the transfer is completed, the transaction is still usually better than a sale involving many co-heirs because there is no co-heir conflict over shares. Even so, the buyer must still verify:

that the seller is truly the sole heir,
that there are no omitted compulsory heirs,
that taxes and settlement requirements are complied with,
that the decedent had valid ownership,
that no creditors remain unpaid.

A false “sole heir” claim is one of the biggest dangers in these transactions.

VIII. Sale by All Heirs Together

This is generally the safer route if the estate has not yet been fully transferred.

If all heirs join in the sale, and the settlement documents are complete, the buyer has a much better legal foundation because the entire hereditary ownership is being conveyed, not just one heir’s undivided interest.

This commonly appears in a document called Extrajudicial Settlement of Estate with Sale, where:

the heirs first acknowledge their status,
identify the estate,
settle and partition it, or collectively act over it,
then sell the property to the buyer.

This is often the most practical way to transfer inherited property still under the deceased’s name.

Still, the buyer must ensure the heirs are truly complete and correctly identified.

IX. Can One Heir Sell the Entire Property Without the Consent of the Others?

As a general rule, no.

One heir cannot validly convey the shares of the other heirs without their authority. At most, that heir may transfer only:

his or her own hereditary rights,
his or her own undivided interest,
whatever share may ultimately belong to him or her.

A deed by one heir purporting to sell the entire inherited land is vulnerable to challenge to the extent it covers rights not belonging to that heir.

This is true even if the buyer acted in good faith. Good faith helps in some contexts, but it does not create ownership where the seller had no right to convey the others’ shares.

X. Can an Heir Sell a Specific Physical Portion Before Partition?

Usually this is legally problematic.

Before partition, co-heirs are generally co-owners of the whole property in ideal shares. That means no single heir can confidently point to one exact strip, corner, frontage, or backyard portion and say, “This exact part is mine alone,” unless there has already been a valid partition or an allocation recognized by all co-heirs.

A sale of a specific portion before partition may still have some effect between seller and buyer, but it may not bind the co-heirs if the seller had no exclusive right over that specific portion yet.

This often creates these consequences:

the buyer may be forced to await partition,
the buyer may receive only whatever equivalent share the seller actually gets,
the chosen specific area may not ultimately belong to the seller,
the transaction may become the subject of partition litigation,
possession disputes may arise.

XI. Untitled Inherited Land: What Is Really Being Sold?

Untitled inherited land is common in rural areas and older family properties. In those cases, the heirs may hold:

possession,
tax declarations,
survey plans,
old deeds,
judicial confirmations,
Spanish-era or pre-war documents,
ancestral or long possession claims.

In such cases, a “sale” may transfer whatever rights the heirs inherited, but the buyer must understand that:

there is no Torrens title guarantee,
ownership may still be contestable,
registration may not be immediately possible,
surveys and technical descriptions may be lacking,
overlapping claims may exist,
occupants or other relatives may challenge possession.

This is not automatically invalid, but it is much riskier than buying already titled property.

A buyer in these cases should understand that the transaction may function more as a transfer of claim, possession, and inherited interest rather than a straightforward title transfer.

XII. Tax Declaration Is Not Title

This point cannot be overstated.

In Philippine property practice, sellers often say, “May tax declaration naman,” as though that resolves ownership. It does not.

A tax declaration may support a claim of possession or ownership, but it is not the same as a Torrens title. It does not conclusively prove ownership. A buyer who purchases inherited land “without title” but only with a tax declaration is taking a major legal and factual risk.

The buyer must distinguish between:

evidence that taxes were paid, and
conclusive proof that the seller owns registrable title.

Those are not the same.

XIII. Documents Commonly Used in These Transactions

The proper document depends on the status of the estate and the land.

1. Deed of Assignment of Hereditary Rights

Used when an heir assigns whatever hereditary share or rights belong to the heir in the estate or in a specific estate property.

2. Deed of Sale of Rights and Interests

Used when the seller is not yet in a position to transfer clean titled ownership but can transfer rights and interests.

3. Extrajudicial Settlement of Estate with Sale

Used when all heirs settle the estate and simultaneously sell the property.

4. Deed of Self-Adjudication with Sale

Used where there is truly only one heir and the sole heir sells the adjudicated property.

5. Deed of Absolute Sale

Best used when ownership over the specific property is already established and transferable. It is sometimes still used in inherited-property situations, but the underlying legal reality may still be a sale of rights if title has not yet been settled.

6. Partition Agreement

Important where multiple heirs need first to define which specific property or portion belongs to whom.

7. Special Power of Attorney

Necessary where one heir signs for another, unless the co-heir personally signs.

XIV. Essential Requirements for Validity

A transaction over inherited land rights should, at minimum, satisfy the basic requirements of contracts and property transfers.

A. Legal capacity

The seller must have legal capacity. If an heir is a minor, incapacitated, or deceased, special rules apply.

B. Authority

If one person signs for others, that person must have authority.

C. Consent

The parties must knowingly agree to what is really being sold: rights, interests, undivided share, or a specific adjudicated property.

D. Object certain

The subject matter must be clearly described. If only rights are being sold, the deed must say so clearly. If a specific parcel is being sold, the legal basis for the seller’s ownership of that parcel must exist.

E. Cause or price certain

The price and payment terms must be definite.

F. Proper form

Real property transactions and assignments of rights affecting immovables should be documented in a public instrument for practical enforceability and registrability.

G. Compliance with estate and tax rules

Even a valid private sale may run into difficulty if the estate is unsettled, taxes unpaid, or transfer requirements incomplete.

XV. Registration Issues: Why the Buyer May Not Immediately Get a New Title

Even if the sale of hereditary rights is valid between the parties, the buyer may still not be able to immediately register the transfer and obtain a new title.

Why?

Because the Registry of Deeds and other offices typically require the chain of transfer to be in order. If the registered owner is dead, the usual path is:

settle the estate,
pay applicable estate-related obligations,
execute proper settlement/adjudication documents,
comply with documentary requirements,
then transfer the property or the heir’s share in accordance with law.

A buyer who purchases too early or with incomplete documents may end up holding only a private contractual right until the estate is regularized.

This can take years in some cases.

XVI. Estate Settlement Is Not Optional in Practice

Many parties think they can skip estate settlement by executing a simple deed of sale. In practice, this is one of the biggest sources of delay and litigation.

If title remains in the name of the deceased, the death of the owner creates a succession issue that usually must be properly addressed. The buyer cannot cleanly bypass that problem merely by paying the heirs and signing a deed.

Eventually, the transaction usually runs into one or more of the following:

Registry of Deeds requirements,
Bureau of Internal Revenue requirements,
local assessor’s transfer requirements,
missing heir problems,
estate tax issues,
publication and notarization issues,
technical description discrepancies,
extra-judicial settlement defects.

XVII. Risks to the Buyer

Buying inherited land rights without title is not automatically unlawful, but it is undeniably high-risk. The buyer should be aware of the full risk profile.

1. Omitted heirs

A child, spouse, illegitimate child, adopted child, ascendant, or other compulsory heir may later appear.

2. Seller sold more than his share

A single heir may have represented the whole property as his own.

3. No valid partition

The “specific portion” sold may not actually belong to the seller.

4. Estate debts

The estate may still have obligations reducing the distributable share.

5. Estate taxes and transfer costs

These can be substantial and may delay transfer.

6. Documentary defects

Missing death certificate, marriage certificate, birth certificates, title copy, tax clearances, publication proof, technical descriptions, or valid IDs can stall the transaction.

7. Defective title of the decedent

The deceased may not have had valid ownership to begin with.

8. Untitled or overlapping claims

Common in ancestral and rural properties.

9. Possession disputes

Occupants, relatives, tenants, or informal settlers may resist turnover.

10. Inability to register

The buyer may hold only contractual rights for a long time.

11. Fraud and double sale

A seller may sell the same rights to more than one buyer.

12. Forged signatures

Particularly in transactions involving many heirs abroad or in different provinces.

XVIII. Risks to the Selling Heir

The heir-seller also faces legal exposure.

1. Selling property not exclusively owned

An heir who sells the whole property without authority may face civil liability.

2. Misrepresentation

If the seller claims to be sole heir or claims clean title when none exists, that creates serious liability risk.

3. Family disputes

Co-heirs may challenge the transaction.

4. Tax exposure

Improper structuring may create tax and documentation problems.

5. Rescission or damages claims

If the buyer cannot obtain what was promised, disputes over refund and damages may follow.

XIX. Rights of the Buyer After Purchase of Hereditary Rights

A buyer who validly acquires hereditary rights generally steps into the seller-heir’s position to the extent of the rights transferred.

Depending on the wording of the document and the surrounding facts, the buyer may be able to:

assert the seller’s share in partition,
participate in efforts to settle the estate,
receive the portion eventually attributable to the seller’s hereditary rights,
demand compliance from the seller under the contract,
protect possession if delivered,
seek reimbursement, rescission, or damages if the sale is defective.

But the buyer does not automatically acquire more rights than the heir-seller had.

That is the central limit.

XX. Is Court Approval Required?

Not always, but sometimes.

No court proceeding needed in some cases

If the estate qualifies for proper extrajudicial settlement, the heirs may settle it outside court.

Court involvement needed in other cases

Court proceedings may be necessary where there is:

a will,
disagreement among heirs,
minors or incapacitated heirs requiring special handling,
estate debts and contested claims,
need for judicial administration,
adverse claims or partition disputes.

If the estate is under administration, transactions affecting estate property may become more restricted and more formally supervised.

XXI. The Role of Co-Ownership Before Partition

Before partition, inherited property often falls under co-ownership among heirs. This has major consequences.

Each co-owner or co-heir has rights over the whole property in an ideal sense, proportional to his share, but not over a specific identified portion unless partition has taken place.

Because of that:

one heir may dispose of his undivided share,
but not the undivided shares of others,
and not necessarily a definite portion as exclusively his.

This is why a buyer should be suspicious of statements like:

“Ako ang panganay, so akin na ito.”
“Ako ang nagbabayad ng amilyar, so sa akin ito.”
“Kami naman ang nakatira rito, so puwede ko ibenta buong lupa.”
“Napag-usapan na namin iyan sa pamilya.”

Those statements do not necessarily create exclusive legal ownership.

XXII. Possession Does Not Equal Full Transferable Ownership

Some heirs are already in actual possession of inherited property for years. That fact matters, but it does not automatically mean they can validly transfer the entire property as exclusive owners.

Possession may strengthen a claim. It may help in proving control, payment of taxes, or family recognition. But it is not a substitute for proper estate settlement and proof of legal share.

In family disputes, the heir in possession is often the one who sells first. That does not mean the sale covers the rights of absent co-heirs.

XXIII. Extrajudicial Settlement With Sale: Often the Cleanest Practical Structure

For inherited titled property still under the decedent’s name, one of the cleanest practical approaches is usually:

all heirs are identified,
death and family documents are gathered,
the property records are reviewed,
the estate is extrajudicially settled if legally allowed,
the heirs then collectively sell in one integrated instrument.

This structure reduces the problem of one-heir sales and clarifies the chain of transfer.

But it must still be carefully prepared. A badly drafted document can cause future rejection by government offices or trigger later family disputes.

XXIV. Common Mistakes in Philippine Practice

1. Using a Deed of Absolute Sale when only rights are actually being sold

This creates false expectations and later conflict.

2. Selling a specific portion without partition

One of the most frequent legal mistakes.

3. Failing to identify all heirs

A classic ground for dispute.

4. Assuming tax declarations prove ownership

They do not.

5. Ignoring estate debts

These can affect the distributable estate.

6. Accepting a family tree without civil registry proof

Birth, marriage, death, and legitimacy issues matter.

7. Relying on notarization alone

A notarized deed is not automatically valid against the world if the seller lacked rights.

8. Believing possession cures title defects

It does not, by itself.

9. No title verification

The registered owner may not be the decedent claimed by the sellers, or annotations may exist.

10. No technical verification

Actual area, boundaries, and occupation may not match the deed.

XXV. Due Diligence Checklist for a Buyer

A prudent buyer of inherited land rights in the Philippines should examine, at minimum:

death certificate of the decedent,
marriage certificate of the decedent, if relevant,
birth certificates of all heirs,
proof of heirship,
title copy, if titled,
tax declaration,
tax clearance/real property tax receipts,
extrajudicial settlement, deed of adjudication, or probate papers, if any,
settlement of estate tax matters,
technical description and survey records,
actual possession and occupancy,
identities and signatures of all heirs,
special powers of attorney where applicable,
existence of mortgages, liens, notices, adverse claims, or cases,
whether the property is tenanted or occupied,
whether the portion being sold is already partitioned,
whether the seller is transferring only rights or actual adjudicated ownership.

A buyer who skips these steps is effectively speculating.

XXVI. Due Diligence Checklist for an Heir-Seller

The heir-seller should also be careful to avoid future liability.

The seller should determine:

Am I really an heir, and what is my share?
Are there other heirs I am not accounting for?
Is the estate settled or unsettled?
Am I selling only my rights, or am I claiming to sell a specific property?
Has there been a valid partition?
Are there estate debts?
Are taxes and documents complete?
Do I have authority from co-heirs, if I am signing for them?
Is the deed accurately worded as a sale of rights if title transfer is not yet possible?

An heir who oversells the legal effect of the transaction invites litigation.

XXVII. What a Good Deed Should Clearly State

A well-drafted deed for sale of inherited land rights should clearly identify:

the deceased owner,
the basis of the seller’s heirship,
whether the estate is settled or unsettled,
whether the property is titled or untitled,
the exact property description,
whether what is sold is hereditary rights, undivided share, or an already adjudicated specific property,
whether possession is delivered,
whether taxes, fees, and expenses are allocated between parties,
warranties and limitations,
what happens if additional heirs or defects appear,
the seller’s obligation to cooperate in future estate settlement and transfer documents.

Ambiguity is dangerous in these transactions.

XXVIII. Warranty Issues

A buyer often assumes that a deed automatically carries a full warranty of ownership. In inherited-property sales without title transfer, that assumption is unsafe.

The scope of the seller’s warranty may be limited by the nature of what is sold.

If the seller is selling only “rights and interests,” the buyer should not read that as a guarantee of immediate, unassailable, registrable ownership. The contract should be read according to its actual wording and legal context.

That said, a seller cannot hide behind “sale of rights” language to excuse outright fraud. If the seller was never an heir, forged the transaction, concealed co-heirs, or knowingly misrepresented ownership, liability can still arise.

XXIX. Can the Buyer Take Possession Immediately?

Possibly, but possession and ownership are separate issues.

The parties may agree that the buyer takes possession immediately. That may be valid between them. But immediate possession does not automatically settle the rights of co-heirs, occupants, tenants, or third parties.

If one heir delivers possession of the entire property without consent of the others, conflict is likely.

The buyer should distinguish between:

contractual turnover,
peaceful possession,
legal entitlement to possess as against all others,
clean registrable ownership.

Those are different layers of rights.

XXX. What Happens if an Omitted Heir Appears Later?

This is one of the gravest risks.

If an omitted heir later proves lawful heirship, that heir may assert rights over the estate. Depending on the facts, the buyer’s acquisition may be reduced, challenged, or complicated.

This is why “family assurance” is not enough. Philippine succession law gives serious protection to compulsory heirs.

A buyer should never rely solely on statements like:

“Wala nang ibang anak.”
“Kami-kami lang ang magkakapatid.”
“Patay na rin naman iyong unang asawa.”
“Hindi na kikibo iyong anak sa labas.”

Those statements must be verified through documents and circumstances.

XXXI. Foreign-Based Heirs and Special Powers of Attorney

A great many inherited-property sales involve heirs abroad. In such cases:

each heir should either personally sign or be represented by a valid authority,
the authenticity and formal sufficiency of powers of attorney matter,
document execution abroad must be handled correctly for Philippine use.

A missing or defective authority can undermine the transaction.

XXXII. Minors and Incapacitated Heirs

Where any heir is a minor or legally incapacitated, extra caution is required. Transactions involving their property interests are not routine private family matters. Special legal protections apply, and improper handling can make the transaction voidable or otherwise defective.

Any sale involving minors’ hereditary rights is far more legally sensitive than an ordinary adult transaction.

XXXIII. Judicial vs. Extrajudicial Settlement and the Buyer’s Position

The buyer’s position is strongest where:

the estate has been validly settled,
all heirs are accounted for,
the seller’s share is clear,
the property is titled and transferable,
there are no conflicting claims.

The buyer’s position is weakest where:

there is no settlement,
there are several heirs,
one heir alone sold,
the property is untitled,
no partition exists,
the buyer was promised a specific portion without basis,
there are possession disputes,
there may be omitted heirs or debts.

XXXIV. Is the Transaction Void?

Not every sale without transferred title is void.

That is an important correction to a common misconception.

A sale of inherited land rights may be valid as a sale or assignment of rights, even if no new title can yet be issued. The real question is what exactly was validly sold.

The transaction becomes vulnerable when:

the seller had no rights at all,
the seller sold rights of others without authority,
the object of sale was falsely represented,
the contract violates mandatory legal rules,
signatures or authority are defective,
the buyer was promised more than the seller could legally convey.

So the issue is often not “valid or invalid” in a simplistic sense, but rather:

valid as to what rights?
enforceable against whom?
subject to what limitations?
sufficient for registration or not?
vulnerable to which challenges?

XXXV. Practical Legal Conclusions

1. An heir may sell inherited rights even before title is transferred

This is generally true in Philippine law, but what is transferred is often only hereditary rights or undivided interest, not clean titled ownership.

2. One heir usually cannot sell the whole inherited property without authority from the others

At most, that heir transfers only his own share.

3. Before partition, a co-heir usually cannot guarantee a specific physical portion as exclusively his

A sale of a specific area before partition is legally risky.

4. A title still in the name of the deceased does not prevent all transactions

But it means the chain of transfer is incomplete and estate settlement remains necessary.

5. A tax declaration is not a title

It is only supporting evidence at best.

6. The safest route is usually settlement of the estate first, or collective action by all heirs

This minimizes later disputes.

7. Buyers of inherited land rights must understand they may be buying into an estate problem, not just land

That is the real commercial reality.

XXXVI. Best Practices in the Philippine Setting

In actual Philippine practice, the safest sequencing is usually:

identify all heirs,
verify the decedent’s ownership,
determine whether the property is titled or untitled,
settle the estate properly,
partition if necessary,
ensure all heirs consent or all required parties sign,
use the correct deed,
pay the proper taxes and fees,
register in proper order,
only then treat the transaction as a clean sale of land.

Where the parties insist on proceeding before full transfer, the deed should candidly reflect that the subject is rights and interests and should allocate the risks clearly.

XXXVII. Final Legal Position

Under Philippine law and practice, the sale of inherited land rights without title is possible, but it is not the same as an ordinary sale of fully titled land. The heir may have a transferable hereditary interest upon the decedent’s death, yet that interest is often:

undivided,
subject to the rights of co-heirs,
subject to estate settlement,
subject to debts and taxes,
subject to proof of heirship and ownership,
insufficient by itself for immediate issuance of a new title.

The most important rule to remember is this:

Without prior partition or adjudication, an heir usually sells only the heir’s hereditary or undivided share, not a guaranteed specific physical portion of the inherited land.

That single principle explains most of the legal risks, most of the documentary requirements, and most of the disputes that arise in Philippine transactions involving inherited land rights without title.