A deed of sale of land in the Philippines is the written instrument by which ownership over land is sold and transferred from one person to another. In Philippine law, it is one of the most important legal documents in property transactions because land ownership is not transferred safely by handshake, verbal promise, or informal receipt alone. For a land sale to be legally sound, the transaction must satisfy the rules on contracts, sales, property ownership, documentation, notarization, taxes, registration, and, where applicable, special restrictions under land, family, agrarian, condominium, subdivision, and nationality laws.

A deed of sale is not merely a private paper. In real property practice, it is the core transfer document around which the rest of the transaction revolves: title verification, payment, tax compliance, transfer of title, and protection against later disputes.

This article explains the full legal framework of the deed of sale of land in the Philippine context.

1. What a deed of sale of land is

A deed of sale of land is a written contract where the seller transfers ownership of a parcel of land to the buyer for a price certain in money or its equivalent.

Its basic legal elements are:

there must be a seller with the right to sell;
there must be a buyer with capacity to buy;
there must be a determinate property, meaning the land being sold is identified;
there must be a price certain in money or its equivalent;
there must be consent between the parties;
the sale must be in a form sufficient for validity or enforceability where the law so requires.

In the Philippines, because land is immovable property, documentation is critical. While a contract of sale is generally consensual in nature, the sale of land is not something prudent parties leave to oral proof. The transaction must be properly documented, and in practice, a written and notarized deed is indispensable for registration and transfer.

2. The legal nature of a sale of land

A sale is a contract where one party obligates himself to transfer ownership and deliver a determinate thing, and the other to pay a price certain in money or its equivalent. In land sales, the thing sold is the real property itself.

The deed of sale is important because it shows:

the parties’ identities;
the fact of sale;
the land being sold;
the price;
the conditions of the transaction;
warranties or disclaimers;
acknowledgment before a notary public;
the basis for tax payment and title transfer.

Without a proper deed, proving the exact terms of a land transaction becomes difficult. Without registration, the buyer also becomes vulnerable against third persons.

3. Deed of Absolute Sale vs. Contract to Sell

One of the most important distinctions in Philippine property law is the difference between a Deed of Absolute Sale and a Contract to Sell.

Deed of Absolute Sale

In an absolute sale, ownership is transferred upon delivery, subject to the requirements of law and the terms of the agreement. The seller is essentially saying that the property is being sold outright.

This is the document most commonly referred to when people say “deed of sale.”

Contract to Sell

A contract to sell is different. In this arrangement, the seller usually reserves ownership until the buyer fully pays the purchase price or fulfills some other suspensive condition. Full ownership does not automatically pass at the time the contract is signed.

This distinction matters greatly.

A transaction labeled “sale” may not yet transfer ownership if, by its terms, ownership is retained by the seller until full payment. In practice:

absolute sale = present transfer of ownership, subject to legal formalities and delivery;
contract to sell = promise to transfer ownership upon fulfillment of a condition, usually full payment.

Many disputes in Philippine real estate come from parties confusing these two.

4. Why the deed must be in writing

The sale of land should be in writing for enforceability and proof. In practice, a written deed is indispensable because land transactions are covered by rules requiring written evidence. More importantly, a written deed is needed for:

notarization;
payment of documentary and transfer taxes;
registration with the Registry of Deeds;
issuance of a new title;
presentation to the BIR, assessor, treasurer, banks, and government offices;
evidentiary protection in litigation.

An oral sale of land is highly risky. Even if there was agreement in fact, proving it and enforcing it can become a major legal problem.

5. Essential requisites of a valid deed of sale

A deed of sale of land must rest on the essential requisites of a valid contract.

A. Consent

The seller and buyer must freely and knowingly agree to the sale. Consent must not be vitiated by:

mistake;
violence;
intimidation;
undue influence;
fraud.

If consent is defective, the deed may be voidable or otherwise challengeable.

B. Object

The property sold must be determinate or capable of being determined. The land must be identifiable, typically through:

title number;
tax declaration number;
lot number;
survey plan reference;
technical description;
location and area.

C. Cause or consideration

The purchase price must be real, lawful, and certain in money or its equivalent.

If the price is simulated, fictitious, or not truly intended, the deed may be invalid or recharacterized.

6. The seller must have the right to sell

A deed of sale is only as good as the seller’s authority and ownership.

The seller must be:

the true owner;
the registered owner, or
someone legally authorized to sell, such as an attorney-in-fact, administrator, guardian with authority, or corporate officer with board authority.

A buyer must never assume that mere possession proves authority to sell. A person may occupy land without owning it. A relative may hold a title document without authority. A broker cannot sign for the owner unless properly authorized.

This is why due diligence before signing is critical.

7. Capacity of the parties

Both parties must have legal capacity.

Seller

The seller must be legally capable of disposing of property. Issues arise when the seller is:

a minor;
incapacitated;
deceased;
married and selling conjugal/community property without required spousal participation;
acting through an unauthorized agent;
a corporation without proper authority;
a co-owner selling more than his undivided share;
an heir selling property still under estate settlement complications.

Buyer

The buyer must also have capacity to contract. Restrictions may arise when the buyer is:

a minor;
juridically incapable;
a foreigner buying land prohibited by constitutional or statutory rules;
acting through an invalid representative.

8. Foreign ownership restrictions

One of the most important Philippine rules on land sales is this: private land is generally reserved to Filipino citizens and to corporations or associations meeting nationality requirements under Philippine law.

As a general rule, foreigners cannot directly own private land in the Philippines, subject to limited exceptions recognized by law, such as hereditary succession in some cases.

This means a deed of sale of land in favor of a foreigner may be legally defective or void if it violates constitutional and legal restrictions.

This issue must be distinguished from:

condominium ownership, which follows different rules;
long-term lease arrangements, which are not the same as ownership;
hereditary succession, which is a special case;
dual citizenship situations, where citizenship status becomes critical.

A deed that violates nationality restrictions creates severe legal risk.

9. Marital property issues

In Philippine land sales, marital property law is often decisive.

If the seller is married, the buyer must determine whether the land is:

exclusive property of the seller; or
conjugal/community property requiring the spouse’s participation or consent.

A deed signed by only one spouse may be defective if the property forms part of the absolute community or conjugal partnership and the law requires joint action or consent.

Likewise, if the buyer is married, the characterization of the acquired property may have implications for ownership, administration, and later disputes.

Because marriage affects property relations, civil status in the deed is not a trivial detail. It matters legally.

10. Sale by heirs and estate complications

Many Philippine land disputes arise from sales by heirs before formal settlement of the estate.

Important issues include:

whether the seller is merely an heir and not yet the titled owner;
whether the estate has been extrajudicially or judicially settled;
whether all heirs participated;
whether estate taxes and title transfer issues remain unresolved;
whether the property is still in the name of a deceased person.

A person who is only one of several heirs generally cannot validly convey the entire property unless legally authorized. At most, the seller may transfer only whatever hereditary rights or undivided share he actually has, subject to the outcome of estate settlement.

A buyer who purchases from only one heir without checking the full estate situation takes serious risk.

11. Co-owned land

If land is co-owned, one co-owner cannot unilaterally sell the entire property as if he were sole owner. He may generally sell only his undivided share, unless the others authorize the sale or all co-owners sign.

So a deed appearing to sell the whole parcel may be valid only to the extent of the seller’s actual share.

This is a common trap in family-owned lands.

12. Sale through an attorney-in-fact

A deed of sale may be signed by an agent under a special power of attorney or similar authority. In land transactions, the authority to sell must be clear and specific.

The buyer should verify:

the authenticity of the SPA;
whether it is notarized;
whether it specifically authorizes sale of the particular land;
whether it authorizes receipt of payment;
whether it remains valid and unrevoked;
whether the principal was alive when the sale was made.

Agency ends in important situations, including death of the principal in many cases, so timing matters. A stale or revoked SPA can ruin a sale.

13. Corporate and entity sellers

If the seller is a corporation, cooperative, partnership, association, or other juridical entity, the buyer must verify authority.

The deed should be backed by:

board resolution or secretary’s certificate where required;
proof that the signatory is authorized;
proof that the entity owns the property;
proof that the sale is within the entity’s powers.

A corporate officer’s signature alone does not automatically prove authority.

14. What a deed of sale of land usually contains

A proper deed of sale of land commonly includes:

title of the document;
date and place of execution;
full names of the parties;
citizenship;
civil status;
age or legal capacity language;
residence address;
statement that the seller is the lawful owner;
description of the land;
title number or tax declaration reference;
technical description or reference to attached description;
purchase price;
acknowledgment of receipt of payment, if applicable;
transfer language;
undertakings on taxes and expenses;
warranties on title or possession, if any;
signatures of the parties and witnesses;
notarial acknowledgment.

Depending on the transaction, the deed may also state:

whether improvements are included;
whether the property is tenanted or occupied;
whether there are easements;
whether there is an existing mortgage;
who will pay capital gains tax, documentary stamp tax, transfer tax, registration fees, and incidental expenses;
turnover date;
possession arrangements;
special conditions.

15. Description of the property

The property description is one of the most critical parts of the deed.

The deed should identify the land with enough certainty to avoid confusion. This often includes:

Transfer Certificate of Title or Original Certificate of Title number;
lot number;
block number where applicable;
survey plan;
location;
area in square meters;
technical description;
boundaries;
tax declaration references.

If the land is untitled, extra caution is needed because the deed may rely on tax declarations, surveys, possession history, and other evidence. Untitled land is not automatically unsellable, but it is much riskier.

A vague description can trigger disputes over what was actually sold.

16. Price and consideration

The deed must state the consideration. The price should be:

real;
lawful;
certain or ascertainable.

This is not merely a formality. The stated price affects:

validity questions in simulated or sham transactions;
tax computation;
possible donor’s tax issues if the price is grossly unrealistic in relation to actual intent;
later claims of underpayment or overpayment;
BIR assessment issues;
anti-fraud scrutiny.

Underdeclaration of price in deeds is a serious legal and tax risk.

17. Earnest money, down payment, and full payment

These concepts are often confused.

Earnest money

Earnest money can be proof of the perfection of the sale and is usually part of the purchase price.

Down payment

This is a portion of the price paid in advance.

Full payment

If full payment has been made, the deed may acknowledge complete receipt.

A buyer should not assume that because a deed says “received in full,” the real payment issues are settled beyond dispute. Conversely, parties should not sign an absolute sale acknowledging full payment unless that reflects reality.

Mismatch between actual payment and the deed’s language is a common source of litigation.

18. Absolute sale with unpaid balance

Some parties execute a deed of absolute sale even though part of the price remains unpaid. This is dangerous if poorly drafted.

Ownership consequences depend on the real legal structure. If the parties truly intended to reserve ownership pending full payment, the better instrument may be a contract to sell, not an absolute sale.

If an absolute sale is executed, the seller may have transferred ownership but retained only a right to collect the unpaid balance, unless the document validly provides otherwise.

Confusing these structures can prejudice either side.

19. Public instrument and notarization

A deed of sale of land should be notarized. Once notarized, it becomes a public document.

This is crucial for several reasons:

it enjoys greater evidentiary weight than a private document;
it is generally required for registration;
it helps establish due execution;
it is necessary for most transfer processing steps.

Notarization does not cure every defect. A notarized deed can still be void if:

the seller had no authority;
signatures were forged;
the property could not legally be sold;
consent was vitiated;
the transaction violated law.

Still, as a practical matter, a land deed that is not notarized is highly problematic for registration and enforcement.

20. Effect of notarization

Notarization converts the document into a public instrument and creates a presumption of regularity. But it is not magic.

It does not:

create ownership where none existed;
validate a forged signature;
legalize an unconstitutional land transfer;
replace the need for registration;
defeat proof of fraud.

Improper notarization can itself become a ground for challenge and administrative liability.

21. Delivery and transfer of ownership

In sale law, ownership is ordinarily transferred by delivery. In real property transactions, delivery may be actual or constructive. Execution of a public instrument can operate as constructive delivery, unless there is a contrary intent or legal obstacle.

But in Philippine land practice, one must distinguish between:

transfer of ownership between the parties; and
effectiveness against third persons.

Between the parties, a valid sale may produce effects even before registration. But as against third persons, registration is critical.

This is why the buyer must not stop at signing the deed.

22. Registration: the decisive practical step

A deed of sale of land should be registered with the proper Registry of Deeds so that a new title can be issued in the buyer’s name, where the land is titled and registrable.

Registration is crucial because it:

protects the buyer against later conflicting claims;
gives public notice;
updates the certificate of title;
reduces the risk of double sale;
strengthens enforceability against third parties.

A buyer who signs a deed but never registers it may later discover that:

the seller sold the same land to another person;
the property was mortgaged;
an adverse claim was annotated;
title problems emerged;
heirs or creditors intervened.

In Philippine property law, possession of an unregistered deed is not the same as secured ownership against the world.

23. Double sale risk

Double sale is a serious danger in land transactions.

Where the same property is sold to different buyers, priority issues can arise. Registration, good faith, and possession become critical.

A buyer who delays registration runs the risk that another buyer may register first in good faith. This can produce devastating consequences.

This is why immediate processing after execution is not just clerical; it is legally strategic.

24. Titled vs. untitled land

The deed of sale rules apply differently in practice depending on whether the land is titled.

Titled land

Safer, though not automatically risk-free. The buyer should verify:

authenticity of the title;
identity of the registered owner;
annotations;
liens and encumbrances;
boundaries and technical description.

Untitled land

Much more dangerous. The buyer must examine:

tax declarations;
possession history;
survey records;
possible overlapping claims;
classification of the land;
whether it is public land, forest land, ancestral land, agrarian land, or already privately owned;
chain of transfers;
whether title can eventually be secured.

A deed covering untitled land may transfer rights, but the evidentiary and registration risks are far greater.

25. Tax declarations are not the same as title

A tax declaration is not conclusive proof of ownership. It is evidence of a claim and of tax payment, but it is not equivalent to a Torrens title.

Many buyers mistakenly think that because the seller has tax declarations and tax receipts, ownership is settled. It is not.

A deed of sale based only on tax declarations must be approached with caution.

26. Tax consequences of the deed of sale

The deed of sale triggers tax and transfer obligations. In Philippine practice, land sales usually involve several government charges, depending on the nature of the transaction and applicable law.

These may include:

capital gains tax or other applicable tax treatment depending on the nature of the property and seller;
documentary stamp tax;
transfer tax imposed by local government;
registration fees;
tax clearance requirements;
real property tax clearance.

The deed often specifies who will shoulder these amounts, but the parties’ private agreement does not necessarily control government assessment as to legal liability.

Tax compliance is essential because the Registry of Deeds and other offices typically require proof of payment before transfer can be completed.

27. The importance of BIR and local compliance

A signed and notarized deed is not enough. The transaction usually must pass through:

tax filing and payment;
issuance of certificates or clearances;
local transfer tax payment;
assessor’s transfer of tax declaration;
Registry of Deeds registration.

Failure in any of these steps can stall transfer for months or years.

28. Real property tax arrears

Before buying, the buyer should verify whether the land has unpaid real property taxes. Tax delinquency can create problems in transfer and may expose the property to enforcement issues.

A deed may allocate responsibility for unpaid real property taxes, but the buyer should not rely on promises alone. Documentary verification is necessary.

29. Existing liens and encumbrances

A deed of sale of land does not automatically erase mortgages, adverse claims, notices of levy, easements, lis pendens, usufructs, or other encumbrances.

The buyer must examine the title and supporting records.

Common issues include:

mortgage to a bank or private lender;
court levy;
adverse claim;
notice of lis pendens;
easement rights;
right of way disputes;
lease rights;
usufruct;
restrictions in subdivision titles.

A seller cannot give more rights than he legally has.

30. Warranties in a deed of sale

The seller generally warrants certain aspects of the sale unless validly limited by law. These may include warranties regarding:

ownership;
peaceful possession;
freedom from hidden defects in some contexts;
absence of eviction risk, subject to applicable law and stipulations.

In land sales, the most practically significant is the seller’s obligation in case of eviction, meaning the buyer is deprived of the property by final judgment due to a right existing prior to the sale.

Parties may include warranty clauses, but they cannot always escape liabilities that the law imposes.

31. Sale “as is, where is”

Some deeds state that the property is sold on an “as is, where is” basis. This can shift some risk to the buyer, especially regarding physical condition or occupancy. But such language does not automatically erase all legal protections or validate concealed defects in title, fraud, or bad faith.

A buyer should never read “as is, where is” as meaning “buy blindly.”

32. Possession vs. ownership

A deed of sale concerns ownership transfer, but possession is a separate real-world issue.

Land may be:

occupied by tenants;
occupied by informal settlers;
used by relatives;
subject to lease;
encroached upon;
involved in boundary conflict;
tenanted agriculturally.

A buyer who acquires title but not possession may face serious practical and legal hurdles.

That is why a careful deed may include representations on:

current possession;
vacant status;
tenant status;
turnover date;
obligations to remove occupants.

33. Agrarian reform and agricultural land issues

Agricultural land can raise special legal complications. Not all agricultural land may be freely sold without considering agrarian laws, tenancy rights, land reform coverage, retention limits, and transfer restrictions.

If the land is:

covered by agrarian reform;
subject to tenancy;
awarded under agrarian laws;
classified as agricultural with restrictions,

then the deed of sale may be affected by special rules, and in some cases the sale may be restricted, void, voidable, or subject to government approval or statutory limitations.

Agrarian status must never be ignored.

34. Public land, timber land, mineral land, and classification issues

Not every parcel that people treat as “private land” is legally disposable private property.

The buyer must determine whether the land is:

alienable and disposable public land;
private titled land;
forest land;
timber land;
mineral land;
protected land;
foreshore or otherwise restricted land.

A deed of sale over land that cannot legally be privately owned or transferred is seriously defective.

Land classification is therefore fundamental, especially for untitled properties.

35. Subdivision and condominium project issues

Where the land is within a subdivision or part of a larger development, additional issues may arise:

homeowners’ association dues;
restrictions and easements;
road lot access;
project approvals;
common area rights;
developer consent or project rules.

If the property is part of a condominium project, the transaction may involve condominium law rather than an ordinary raw-land sale. One must distinguish land ownership from condominium unit ownership.

36. Sale of only a portion of a larger parcel

A very common Philippine transaction is the sale of a portion of a larger titled or untitled property.

This is legally delicate.

The deed should address:

exact metes and bounds of the portion sold;
approved subdivision plan where needed;
segregation requirements;
road access;
utilities;
responsibility for subdivision expenses;
timeline for issuance of separate title.

A deed that sells a “portion” without precise technical identification can be a litigation magnet.

37. Judicial and extrajudicial disputes over deeds of sale

A deed of sale of land may be attacked or enforced in court for many reasons, including:

forgery;
fraud;
lack of authority;
nullity;
simulation;
nonpayment;
rescission;
reformation;
partition-related disputes;
double sale;
boundary conflicts;
specific performance;
annulment of title;
reconveyance.

Many land cases in the Philippines ultimately turn not just on the deed itself, but on surrounding evidence:

title history;
tax records;
possession;
witnesses;
notarial records;
survey plans;
estate records;
marriage records;
corporate resolutions;
proof of payment.

38. Forged deeds

Forgery is one of the gravest risks in land transactions. A forged deed is void and cannot validly transfer ownership.

Even notarization does not save a forged deed. If the seller’s signature was forged, the deed is null, and subsequent problems can cascade through later transfers.

This is why identity verification, document inspection, and notarial integrity are critical.

39. Simulated deeds and sham sales

A deed may also be challenged if the sale was simulated. Examples include:

fake sale to hide assets;
deed signed without real intent to transfer;
sale used to disguise donation or other arrangement;
fictitious price not intended to be paid.

A simulated deed can be void or may be recharacterized depending on the facts.

40. Nonpayment of price

Failure to pay the price does not always automatically void a deed of absolute sale. Often, the seller’s remedy depends on the structure of the agreement and applicable law. In some cases, the remedy may be:

collection of the unpaid price;
rescission where legally available;
damages;
enforcement of contractual remedies.

This is another reason the distinction between absolute sale and contract to sell matters.

If the seller wants ownership to remain with him until full payment, that intent must be reflected in the proper form of agreement.

41. Rescission and cancellation

Not every breach automatically allows rescission. Whether a sale can be rescinded or cancelled depends on:

the terms of the deed;
the nature of the breach;
whether the agreement is a deed of absolute sale or a contract to sell;
applicable legal provisions;
whether judicial action is required.

Improper unilateral cancellation can itself generate liability.

42. Rights of the buyer before registration

A buyer under a valid deed may have rights against the seller even before registration, but the buyer remains exposed.

Without registration:

the title stays in the seller’s name;
third-party dealings remain dangerous;
the seller may create encumbrances;
heirs may complicate matters if the seller dies;
creditors may intervene;
the buyer’s protection becomes weaker.

So while the deed may be binding between the parties, registration remains indispensable in practice.

43. Rights of the seller after execution

Once the seller executes a true deed of absolute sale and constructive delivery occurs, the seller may lose ownership rights, retaining only such rights as the deed or law gives, such as collection rights if part of the price remains unpaid.

A seller who signs too quickly, acknowledges full payment falsely, or turns over title documents carelessly can severely prejudice himself.

44. Notarial and witness issues

The deed should be properly signed and acknowledged. Witnesses may be useful, and in practice are common, though the more decisive requirement is proper notarization for public character and registration utility.

The notary should verify:

identity of signatories;
personal appearance;
competent evidence of identity;
voluntariness;
completeness of document.

Defective notarization can undermine the deed and lead to disputes or sanctions.

45. Documentary attachments often needed in practice

Although not always physically part of the deed, land transfers often require supporting documents such as:

owner’s duplicate title;
latest tax declaration;
tax clearance;
real property tax receipts;
valid IDs;
marriage certificate where relevant;
birth certificate where relevant;
certificate authorizing registration or equivalent tax compliance documents;
special power of attorney;
board resolution or secretary’s certificate;
death certificate and estate documents for inherited property;
survey plans and technical descriptions.

A deed that is formally correct but unsupported by the needed documents may still be impossible to process.

46. Deed of sale and transfer of title process

In a typical titled-land sale, the broader legal workflow often looks like this:

verify title and property status;
verify seller identity and authority;
agree on terms and payment structure;
prepare and sign the deed;
notarize the deed;
pay applicable national and local taxes and fees;
submit documents for registration;
secure issuance of title in buyer’s name;
transfer tax declaration to buyer;
update possession and utility arrangements.

The deed is central, but it is only one stage in the complete transfer process.

47. Land sold with improvements

If the land has a house, building, fence, warehouse, or other improvement, the deed should say whether the sale includes the improvements.

Land and improvements are often treated together in practice, but clarity is essential for:

tax treatment;
valuation;
turnover;
possession;
insurance;
utility accounts;
hidden defect disputes.

48. Special care with family home and occupied residential property

Residential land may involve:

family home protections;
occupancy by relatives;
undocumented inheritance issues;
informal boundary understandings;
unregistered adverse claims.

A buyer who looks only at the title but not at family realities may inherit long disputes.

49. Common mistakes in Philippine deeds of sale of land

The most common legal mistakes include:

buying from someone who is not the true owner;
relying only on photocopies of title;
failing to inspect the title for annotations;
ignoring spouse consent issues;
buying inherited property without complete estate settlement;
using an absolute sale when the arrangement is really a contract to sell;
vague property description;
false recital of full payment;
signing without notarization;
failing to register promptly;
underdeclaring the price;
ignoring taxes and transfer fees;
failing to check possession and occupancy;
overlooking agrarian or land classification restrictions;
allowing an unauthorized broker or relative to sign;
buying only on the strength of tax declarations;
purchasing a “portion” without approved technical segregation.

50. Best legal framework for evaluating a deed of sale of land

The safest way to analyze any deed of sale of land in the Philippines is to ask these questions in order:

First: Can this land legally be sold?

Check land classification, ownership restrictions, agrarian issues, and title status.

Second: Is the seller the proper person?

Check title, estate status, co-ownership, marital property, and authority.

Third: Is the buyer legally qualified?

Especially for citizenship-related restrictions and capacity issues.

Fourth: Is the property precisely identified?

The deed must clearly describe what is being sold.

Fifth: What exactly is the transaction structure?

Is it an absolute sale, contract to sell, sale of hereditary rights, or sale of an undivided share?

Sixth: Is the consideration real and properly stated?

Price issues affect validity, proof, taxes, and disputes.

Seventh: Is the deed properly executed and notarized?

This is indispensable for registration and evidentiary strength.

Eighth: Has the transaction been fully processed?

Taxes, clearances, and registration matter as much as the deed itself.

51. Final conclusion

In the Philippines, a deed of sale of land is the principal legal instrument for transferring land ownership, but its effectiveness depends on far more than a signed paper. A sound land sale requires compliance with the law on contracts, sales, property ownership, family relations, succession, agency, taxation, registration, and sometimes agrarian, constitutional, or land-classification restrictions.

The deed must accurately identify:

the parties;
the property;
the price;
the authority to sell;
the conditions of transfer.

It should be written, notarized, and followed by proper tax payment and registration. Without registration, the buyer may remain dangerously exposed. Without due diligence, even a notarized deed can collapse because of forgery, lack of authority, marital defects, estate issues, nationality restrictions, or title problems.

The most important practical truth is this:

A deed of sale of land is not just a form. It is the legal heart of the transaction, but it only works safely when the land is legally transferable, the seller is truly authorized, the terms are correctly structured, and the transfer is properly completed through taxes and registration.

That is the full legal landscape. In Philippine property law, the safest deed is not merely one that is signed, but one that is valid in substance, correct in form, and completed through lawful transfer procedures.