For many taxpayers, filing an annual Portuguese Personal Income Tax (IRS) return is one of the most important tax compliance obligations of the year. However, the process does not end once the return has been submitted through the Portuguese Tax Authority’s online portal (Portal das Finanças).
After filing, it is essential to monitor the status of the return, review the tax assessment notice issued by the Portuguese Tax Authority (Autoridade Tributária e Aduaneira – “AT”), and confirm that the resulting tax liability or refund corresponds to expectations.
In this article, we address three topics that frequently raise questions among taxpayers: how to interpret an IRS tax assessment notice, how to correct errors after filing a tax return, and the consequences of filing an IRS return after the statutory deadline.
How to Interpret a Portuguese IRS Tax Assessment Notice
The IRS tax assessment notice (known in Portuguese as a demonstração de liquidação) is the document through which the Portuguese Tax Authority presents the calculations performed to determine the final amount of tax payable or the refund due.
When reviewing this document, particular attention should be paid to the following elements:
- Total taxable income, to ensure that all declared income has been correctly taken into account;
- Tax deductions and tax benefits, verifying that they correspond to the amounts previously validated;
- Tax losses carried forward from previous years, particularly relevant where capital gains have been reported;
- Tax withheld at source, to confirm that the amounts considered by the Tax Authority match those effectively withheld during the year.
If the assessed amount differs from what was expected, it is advisable to compare the tax assessment notice with the tax return submitted and the supporting documentation used in its preparation.
In many cases, discrepancies arise from errors or omissions in the tax return itself. In other situations, a more detailed review of the tax assessment issued by the Portuguese Tax Authority may be required.
What to Do if You Discover an Error After Filing Your Tax Return
If you discover an error after submitting your IRS return, this does not necessarily mean that the situation cannot be remedied.
Portuguese tax legislation allows taxpayers to correct mistakes by filing an amended tax return (declaração de substituição), which fully replaces the previously submitted return.
This may occur, for example, where the taxpayer:
- omitted income that should have been declared;
- reported an incorrect amount;
- failed to include a mandatory annex;
- subsequently realized that they were entitled to a tax benefit that had not been claimed.
It is also possible for the Portuguese Tax Authority itself to identify discrepancies between the information declared and the data available in its records.
In such cases, the taxpayer will normally be notified and requested either to amend the return or to provide the necessary explanations and supporting documentation.
The sooner an error is corrected, the lower the risk of penalties, additional tax assessments, or other adverse tax consequences. For this reason, taxpayers should not ignore notifications or discrepancy notices issued by the Portuguese Tax Authority.
Consequences of Filing an IRS Return After 30 June
Although it is possible to submit an IRS return after 30 June, the filing will be considered late and therefore outside the statutory deadline.
The main consequence is the possibility of enforcement proceedings being initiated and a financial penalty being imposed.
Under current Portuguese tax legislation, penalties for late filing may range from €150 to €3,750, without prejudice to the application of statutory penalty reduction mechanisms where the relevant legal requirements are met.
In particular, if the taxpayer voluntarily submits the return before receiving any notification from the Portuguese Tax Authority, the penalty may be reduced to €25.
Accordingly, if you realize that you have failed to submit your tax return within the prescribed time limit, it is generally advisable to regularize the situation as soon as possible, preferably before any notification is received from the Portuguese Tax Authority.
Conclusion
If you have already filed your Portuguese IRS return, it is worthwhile reviewing the tax assessment notice to ensure that all relevant information has been correctly taken into consideration.
If you identify an error, receive a discrepancy notification, or disagree with the assessment issued by the Portuguese Tax Authority, it is important to analyze the situation promptly in order to determine the most appropriate course of action.
At this stage, the assistance of a specialized tax professional can be particularly valuable, as it enables the rapid identification of the underlying issue, the assessment of the associated risks, and the definition of the most effective strategy for rectification or challenge. In many cases, timely intervention may prevent unnecessary costs, additional tax assessments, administrative penalty proceedings, and the loss of rights or tax benefits to which the taxpayer may legitimately be entitled.
Belzuz Abogados, S.L.P.’ Tax Department is available to provide tailored advice on all matters relating to Portuguese Personal Income Tax (IRS), including the review of tax assessments, correction of tax returns, and representation in procedures before the Portuguese Tax Authority.