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IRS Uses DOI Sent by Notaries, Cross-Referencing with Income Tax to Identify Discrepancies in Real Estate Transactions to Combat Evasion.
The IRS operates an automated system that compares the information from the Declaration of Real Estate Transactions (DOI), submitted by notaries, with the data declared in the Income Tax (IR) of buyers and sellers. The goal is to detect signs of underreporting when the value reported to the tax authority is lower than what was actually negotiated and to adjust the taxation on capital gains.
In practice, the cross-referencing transforms notary records into a “mirror” of the transaction. According to the Gov portal, if the information in the income tax does not match the DOI, an alert is triggered. From there, the declaration may enter the fine mesh, with notification and, in cases of fraud, heavy fines.
What is the DOI and Why is it Central to the Tax Authority
The DOI is an accessory obligation of the Notary and Real Estate Registry Offices: every sale, donation, or transfer of property must be reported to the IRS.
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The submission is made by the last business day of the following month after the execution of the deed/registration, with data on buyer, seller, value, and property identification.
The transfer occurs through the DOI-Web, an online system that validates and transmits the information. This standardized pipeline ensures complete and auditable data, allowing the tax authority to compare, without subjectivity, what was formalized at the notary and what appears in the annual income tax declarations.
How the IRS Cross-References DOI and Income Tax
As soon as the DOI enters the database, the system links the transaction to the involved social security numbers and begins to confront three fronts: sales price reported by the seller, purchase price of the buyer, and assessment of capital gains.
Any relevant divergence becomes an “inconsistency” and may trigger demands for documentary proof.
This data cross-referencing norm has been in place for several years, but on August 15, 2025, it was updated according to legisweb; this flow also covers cases of omissions (when the sale appears in the DOI but not in the income tax) and situations where the taxpayer declares a value lower than what is recorded.
The comparison is direct: notary x declaration, reducing the margin for “memory” errors or incomplete notes.
When It Becomes Underreporting: Signs that Trigger Audit
The tax authority considers underreporting when the value declared in the income tax is lower than that of the DOI.
The same logic applies to the buyer who reports having paid less than what is actually recorded at the notary.
These gaps indicate an attempt to reduce the tax base, especially in the assessment of capital gains.
In addition to the nominal divergence, incompatible financial movements (for example, large bank deposits close to the sale not reflected in the income tax) reinforce suspicion.
The cross-referencing is expanded with other sources, making it difficult to “hide” part of the price outside the records.
What Happens After the Divergence: Fine Mesh, Proof, and Penalties
Once the inconsistency is detected, the declaration enters the fine mesh. The taxpayer is notified to present documents (deed, contract, proof of payment).
If the version does not match the DOI, the IRS recalculates the tax on capital gains and issues the charge.
Penalties vary depending on the case. The fine for error or omission can reach 75% of the tax due, plus interest and correction.
If fraud is confirmed, the qualified fine can reach 150%. In serious cases, the matter may be referred for a tax evasion crime.
Practical Summary: Underreporting is risky, costly, and leaves documentary trails.
Other Databases That Reinforce the Clamp: e-Finance, Credit Cards, and Real Estate Agencies
The DOI is the backbone of control, but it does not act alone.
The IRS cross-references banking data via e-Finance, along with credit card information and records from real estate agencies.
This integrated mesh helps identify deposits, TEDs, PIX, and payments that suggest a higher price than reported.
In the sum of the bases, the likelihood of inconsistencies going unnoticed drops drastically.
The tax authority, with big data and automation, monitors relevant transactions and compares “what was paid” with “what was declared”.
Best Practices for Buyers and Sellers: How to Avoid Headaches
Report exactly the value of the transaction that appears in the deed/registration. For the seller, correctly assess the capital gains; for the buyer, record the purchase value in the income tax.
Keep contracts, receipts, and statements; they will be your backing in case of questioning.
If there are expenses that reduce capital gains (commission paid by the seller, proven improvements), document them robustly.
Transparency from the start avoids audits, fines, and blocks that can jeopardize new operations and credit.
Why Rigor Increased: Efficiency and Equality
Digitalization has increased the tax authority’s efficiency in combating underreporting and omissions.
The IRS seeks equality: those who report correctly should not compete at a disadvantage with those attempting to “save” on taxes by artificially lowering the sale price.
For the market, the effect is cleansing: cleaner transactions, lower legal risk, and more transparent pricing of properties.
In the long run, everyone benefits from predictability: taxpayers, investors, and the real estate sector itself.
The cross-referencing between DOI and IR has made underreporting easily detectable. With integrated databases and automation, the likelihood of “slipping through” is minimal.
For taxpayers and market professionals, the safest path is total compliance: real value in the deed, same value in the income tax, complete documentation.
Do you consider this rigor from the IRS fair to level the playing field, or do you see it as excessive control?
Please share in the comments if this oversight has changed the way you buy, sell, or declare properties; real cases help other readers understand the impact.
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