Can a deed be modified to change the property's price?

Modifying the public deed of a sale to correct or adjust the price is possible in Peru, but it requires meeting formal requirements before a notary and, above all, not falling into operations that SUNAT could interpret as simulation. This article distinguishes when a clarifying deed is a legitimate procedure and when, on the contrary, it opens a tax contingency.

The clarifying deed in the Peruvian notarial system

The instrument used is the public clarifying deed, provided in the Notary Law (Legislative Decree No. 1049) and related regulations. It serves to remedy material errors, specify elements that the first deed did not clarify, or reflect adjustments agreed by the parties later.

The clarification does not annul the original deed: it complements it. Once signed, it is registered in SUNARP in the same registry entry of the property.

When it is appropriate to modify the price

1. Obvious material error

When the price recorded in the deed differs from the one supported by the minute, bank receipts and preparatory contract. The notary reviews the documents: signed minute, bank transfers, proof from the bank that financed the mortgage loan, correspondence between the parties.

2. Adjustment for area discrepancy

When a new survey, topographic measurement or architectural expert opinion shows area differences from the original deed and the parties agree to adjust the price. It is common in rural lots or in properties with unclear boundaries.

3. Adjustment clause agreed in the minute

Some operations are closed with a provisional price subject to later adjustment (work delivered late, missing meters, liens not released as of the signing date). The clarification formalizes the adjustment agreed in the original minute.

When NOT to modify

If the real intent is to lower the recorded price to reduce taxes —seller's Income Tax or buyer's Alcabala— it is best not to do so. SUNAT has broad powers to review operations on a market-value basis (article 32 of the consolidated Income Tax Law). If undervaluation is detected:

• It determines IR on the market value.
• It applies default interest and fines from 50% to 100% of the omitted tax.
• In extreme cases, the matter can be referred to the prosecution for alleged tax fraud.

The municipality, in turn, can also question the Alcabala tax base if the declared price is lower than the autoavalúo.

Step-by-step process

1. Document the reason for the modification with backup: minute, bank receipts, expert opinion or new survey.
2. Agree with the counterparty on the modification and sign a new clarifying minute, ideally with attorney advice.
3. Take the minute to the notary who formalized the original sale (preferable) or to another competent notary.
4. Sign the clarifying deed. The notary includes the supporting annexes.
5. Pay the notary fees and registry fees.
6. Register the clarification in SUNARP in the same registry entry of the property. Without registration, it is not enforceable against third parties.

Tax implications

For the seller (Income Tax)

If the clarification reduces the price, the second-category IR already paid was in excess: a refund is requested through SUNAT virtual form No. 4949, attaching a copy of the clarifying deed. If it increases it, a corrective return must be filed and the differential paid with interest.

For the buyer (Alcabala)

Alcabala is calculated on the higher of transfer value and IPM- adjusted autoavalúo, with a non-taxable minimum of 10 UIT. If the clarification reduces the price but the autoavalúo remains higher, the Alcabala does not change. If the modification crosses the tax base, a corrective return must be filed before SAT de Lima or the corresponding municipality.

Before SUNARP

Once the clarification is registered, future transfers of the property will show both the original deed and the modification. Traceability protects the buyer.

Practical case: Lima, capture error

In Surco, an apartment was sold for US$ 195,000. The deed recorded US$ 159,000 due to a notarial transcription error. The parties sign a clarifying minute with a copy of the bank transfer for the correct amount, grant the clarifying deed and register it in SUNARP. The seller files a corrective IR return and pays the small differential, plus default interest.

Practical case: Arequipa, area adjustment

A house in Cayma was sold at US$ 1,400 per m² over 280 m² recorded. A new topographic measurement shows 268 m². The parties agree to reduce the total price by US$ 16,800. The clarification records the new price, both IR and Alcabala are adjusted, and it is registered in SUNARP.

Common mistakes

• Modifying the price "verbally" without formalizing the clarification.
• Artificially lowering the price to reduce taxes: market-value audit leaves the operation exposed for five years.
• Forgetting to register the clarification in SUNARP.
• Not processing the IR corrective return before SUNAT.
• Not communicating with the municipality to adjust the Alcabala base.

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