Under Philippine tax law, the deliberate underdeclaration of the sales price in a deed of absolute sale involving real property classified as a capital asset constitutes a serious violation that exposes the parties to substantial civil, administrative, and criminal liabilities. This practice, while historically common as an attempt to reduce tax exposure, is explicitly addressed and penalized under the National Internal Revenue Code of 1997 (NIRC), as amended by Republic Act No. 10963 (TRAIN Law) and subsequent revenue regulations. The Bureau of Internal Revenue (BIR) treats such acts as fraudulent, triggering not only deficiency assessments but also severe sanctions designed to deter tax evasion and falsification of public documents.

Legal Framework Governing Capital Gains Tax and Related Levies

Section 24(D) of the NIRC imposes a final capital gains tax (CGT) of six percent (6%) on the gain presumed to be realized from the sale, exchange, or other disposition of real property located in the Philippines by an individual taxpayer not engaged in the real estate trade or business. The tax base is explicitly the higher of (a) the gross selling price stated in the contract or (b) the current fair market value (FMV) as determined by the Commissioner of Internal Revenue (zonal valuation) or the provincial or city assessor, whichever is higher at the time of sale.

For corporations, gains from the sale of real property are included in gross income and subject to the regular corporate income tax rate under Section 27, but the same valuation rule applies in determining the amount realized.

Closely intertwined are:

Documentary stamp tax (DST) under Section 196 of the NIRC – imposed at the rate of one and one-half percent (1.5%) on the selling price or FMV, whichever is higher.
Local transfer taxes under the Local Government Code (Republic Act No. 7160) – typically 0.5% to 0.75% of the selling price or assessed value/FMV, again taking the higher amount.
Withholding tax obligations (creditable or final) when the seller is engaged in business.

Revenue Regulations (notably RR 2-98, RR 7-2019, and RR 13-2018) mandate that the BIR and the Register of Deeds shall not accept or register deeds where the stated consideration is manifestly lower than the prevailing zonal value without proper justification. The “higher-of” rule is not a loophole; it is a statutory safeguard precisely to prevent underdeclaration.

The Mechanics and Prevalence of Underdeclaration

Underdeclaration occurs when the parties execute and notarize a deed reflecting a selling price lower than the actual consideration agreed upon and paid (whether in cash, check, bank transfer, or other form). Typical patterns include:

Stating the contract price exactly at the zonal value while the buyer remits an additional “off-the-books” amount.
Declaring a nominal or artificially low price even when the zonal value or true market value is substantially higher.
Using “assumed” or “installment” structures that disguise the true total consideration.

Although the “higher-of” rule means the CGT base cannot fall below zonal value, the fraud lies in two dimensions: (1) the deed itself becomes a false public document, and (2) if the BIR later establishes that the actual selling price exceeds the zonal value, the entire excess becomes additional taxable base subject to 6% CGT plus penalties. The falsified deed also distorts the buyer’s cost basis for future disposition, creating perpetual inconsistency in tax records.

BIR’s Authority to Disregard the Declared Price and Recompute Liability

Under Section 6(B) of the NIRC (Best Evidence Obtainable Rule) and Section 43 (Power to Interpret Tax Laws), the Commissioner may disregard any false or fraudulent document and reconstruct the true gross selling price using any evidence, including:

Bank deposit records (authorized under Republic Act No. 10021 and the TRAIN Law).
Buyer’s canceled checks, wire transfers, or affidavits.
Third-party information returns (e.g., from notaries, brokers, or banks).
Discrepancies between the seller’s income tax returns and actual cash flows.
Comparative sales data or appraisal reports.

Once the BIR proves the actual consideration exceeds the zonal value or the declared price, it issues a deficiency assessment covering the additional CGT, DST, and local taxes on the differential. The assessment is prima facie correct, and the burden shifts to the taxpayer to prove otherwise with clear and convincing evidence.

Civil and Administrative Consequences

Deficiency Tax Assessment
The taxpayer must pay the recomputed 6% CGT on the full actual selling price (or the higher amount established), plus recomputed DST and local transfer taxes.
Surcharges
- 25% for late filing or payment (ordinary negligence).
- 50% for willful underdeclaration or fraud (Section 248 of the NIRC).
  Fraud is presumed when the underdeclaration exceeds 30% of the correct tax due, or when the deed price is patently below zonal value without explanation.
Interest
12% per annum on the deficiency from the due date until full payment (as amended by TRAIN Law), computed daily and compounded.
Compromise Penalties and Administrative Fines
Administrative penalties range from ₱10,000 to ₱50,000 per violation under Section 250, plus daily fines for continued non-compliance. The BIR may also impose a 25%–50% compromise rate on the basic tax if settlement is pursued.
Tax Liens and Collection Remedies
Automatic tax lien under Section 219 attaches to the property. The BIR may levy, distrain, or file a civil action to enforce collection. Registration of the sale may be suspended or annulled by the Register of Deeds upon BIR directive.
Impact on Buyer
The buyer’s cost basis for future CGT computation is the actual amount paid (provable by evidence), not the deed price. However, the buyer risks being assessed as a withholding agent if applicable, and may face civil liability for conspiracy if the underdeclaration is proven mutual.

Criminal Liabilities

Underdeclaration is not merely a tax issue; it constitutes criminal offenses under the NIRC and the Revised Penal Code:

Section 253 (Attempt to Evade or Defeat Tax) – Any person who willfully attempts to evade or defeat any tax imposed by the NIRC through the use of false or fraudulent returns, statements, or documents (including a falsified deed) is guilty of a felony. Penalties include a fine of not less than Five Hundred Thousand Pesos (₱500,000) but not more than Ten Million Pesos (₱10,000,000), and imprisonment of not less than six (6) years but not more than ten (10) years.
Section 255 (Failure to File Return, Supply Correct Information, or Withhold) – Filing a false or fraudulent capital gains tax return or DST declaration carries a fine of not less than Ten Thousand Pesos (₱10,000) but not more than Fifty Thousand Pesos (₱50,000), and imprisonment of not less than one (1) year but not more than ten (10) years.
Falsification of Public Document (Article 172, Revised Penal Code) – A notarized deed of absolute sale is a public document. Making untruthful statements therein as to the consideration is punishable by prision correccional in its medium and maximum periods (2 years, 4 months and 1 day to 6 years) and a fine not exceeding ₱5,000 (as adjusted by subsequent laws).
Conspiracy and Other Related Offenses – If the buyer, notary public, broker, or accountant knowingly participates, they may be charged as co-principals. Notaries public additionally face administrative sanctions from the Supreme Court, including suspension or disbarment, plus revocation of notarial commission under the 2004 Rules on Notarial Practice.

Prosecution may be initiated by the BIR through the Department of Justice. Conviction carries moral turpitude implications, permanently barring the individual from holding public office or certain professions.

Liabilities of Other Parties

Notary Public – Liable for notarizing a document with known false statements; subject to disciplinary action and possible criminal charges.
Register of Deeds – May refuse registration and must report suspicious deeds to the BIR under existing memoranda of agreement.
Real Estate Broker or Agent – Subject to suspension or revocation of license by the Professional Regulation Commission and possible inclusion in criminal complaints.
Banks and Financial Institutions – Required to report large cash deposits or suspicious transactions under the Anti-Money Laundering Act, which may trigger BIR investigation.

Detection, Prescription, and Defenses

The BIR routinely conducts post-registration audits, cross-checks zonal values against deed prices, and receives information from the Land Registration Authority and local treasurers. Prescription for assessment is three (3) years for ordinary cases and ten (10) years for fraudulent cases, reckoned from the date of discovery of the fraud (Section 222, NIRC). Criminal actions prescribe in ten (10) years from commission.

Valid defenses are narrow and require clear and convincing proof:

That the declared price was in fact the true and complete consideration.
That the zonal value was erroneously applied and a valid appraisal shows lower FMV.
Good-faith reliance on professional advice (rarely successful in fraud cases).

Mere ignorance of the law or “common practice” is never a defense.

Broader Ramifications and Long-Term Effects

Beyond immediate penalties, underdeclaration:

Creates a cloud on the title that may surface during future sale, mortgage, or estate settlement.
Exposes the property to BIR tax liens enforceable against subsequent owners if not settled.
May be considered an act of tax evasion for purposes of anti-money laundering watch-listing.
Affects the seller’s eligibility for future tax amnesty programs or voluntary disclosures.

In estate tax contexts, an underdeclared prior sale can lead to additional donor’s tax recharacterization if the excess payment is later viewed as a disguised donation.

Compliance Imperatives and Lawful Alternatives

Taxpayers must ensure the deed accurately reflects the entire consideration. Lawful planning tools include:

Proper use of installment sales (subject to proportionate recognition rules).
Availment of tax amnesties or voluntary disclosure programs when announced by the BIR.
Pre-sale valuation consultations with accredited appraisers to align contract price with zonal value.
Full disclosure of all consideration forms in the tax return.

The Philippine tax system is deliberately structured with the “higher-of” rule and stringent anti-falsification provisions to eliminate any economic incentive for underdeclaration. Any attempt to circumvent these safeguards exposes all parties to cascading liabilities that far exceed the tax supposedly saved. Strict adherence to the actual transaction value remains the only legally sustainable approach to real property transfers in the Philippines.