The 2025 Income Tax Campaign is already underway and, with it, a common practice returns: confirming the Tax Agency's draft with a single click. However, that document is only a proposal based on third-party data, not a closed declaration, and errors can result in a Treasury fine on personal income tax or economic losses for the taxpayer.
The draft is prepared with information from banks, companies, or Social Security, but it does not always include relevant personal or financial changes. Situations such as births, changes of address, rentals, or home purchases may not appear correctly, something especially important in communities like Valenciana, where regional deductions have a decisive weight.
Confirming without reviewing can be expensive
There is a widespread idea that, if the draft is prepared by the Treasury, it cannot contain errors. But the regulations are clear: the final responsibility is always the taxpayer's.
If the error benefits the citizen, they will be losing money by not applying deductions or tax benefits. But if the error harms the Tax Agency —for example, by not declaring income or gains—, it can lead to surcharges, interest, and economic penalties.
In these cases, the fine from the Tax Agency on personal income tax can range between 50% and 150% of the undeclared amount, depending on the severity.
Regional deductions, the great loophole in the draft
One of the points where most errors are detected is in the regional deductions, which the system does not always incorporate automatically.
In the Valencian Community, for example, it is common to miss deductions for rent of habitual residence, healthcare expenses, or family situations. Not reviewing them can mean a significant difference in the final result of the declaration.
How to review and correct the draft
The review must be done through the Tax Agency's website, accessing Renta WEB using Cl@ve, digital certificate, or reference number.
Once inside, it is advisable to check in detail:
- Personal data and tax domicile
- Employment income
- Real estate and rentals
- Potential capital gains
- State and regional deductions
The system allows modifying any data and automatically recalculates the result.
Keep the receipt, key for any review
After submitting the declaration, it is essential to download the PDF receipt. This document is the only guarantee in case of a possible check by the Tax Agency.
The conclusion is clear: confirming the draft without reviewing it may seem quick, but it can also end in a fine from the Tax Agency in income tax or lost money.