Tax season is often associated with stress, especially when you are juggling multiple projects and clients. Sometimes you simply forget the deadline. Other times you file everything on time, but a week later you realize you forgot to include an important invoice from abroad.
It happens to everyone. The most important rule here is: do not panic and do not try to hide the problem. The National Revenue Agency (NRA) has clear procedures for such situations. This article will guide you through the correction steps and show you what the actual consequences are in 2026.
1. You missed the deadline: What is next?
The standard deadline for filing the annual tax return for individuals and freelancers is the end of April or early May (if April 30 is a holiday). To ensure you never miss these dates again, save our Accounting calendar 2026.
If you still miss the deadline, here is what you need to know:
- Fine amount: By law, the fine for a late tax return for individuals is usually up to 250 euros (the equivalent of the old 500 BGN) if it is a first-time offense. For a repeated violation, the amount doubles.
- What to do: File the return as quickly as possible, even if it is late. The faster you react, the higher the chance the inspector will impose the minimum penalty. The very fact that you submitted the document voluntarily (before they looked for you) is considered a mitigating circumstance.
2. You filed the return, but found a mistake
This is a much better scenario. The NRA gives you the legal right to fix your mistakes without suffering administrative fines for the mix-up itself, as long as you meet the deadlines.
Here is how the correction mechanism works:
- Correction deadline (until September 30): You have the right to file a corrective tax return once a year, by September 30 of the current year (for the income of the previous year).
- How to file: You log into the NRA portal with your PIC (Personal Identification Code) or electronic signature. You open the same form, but this time you mark at the beginning that this is a “Corrective return”. You fill in all the data again – this time correctly. The new return completely “overwrites” the old one.
- The facilitation in 2026: Do not forget that a large part of the information is already entered by the employers and platforms themselves. To avoid manual entry errors, always check The pre-filled tax returns for 2026 are now available: What you need to know first.
3. Interest on unpaid tax
Even if you file your return or correction on time, if you paid less tax than you owe, default interest is charged.
- The corrective return until September 30 saves you from a fine for “incorrectly submitted data”, but it does not save you from the interest on the tax not paid on time (which should have been paid by the end of April).
- The interest accrues daily on the outstanding difference. Therefore, if you find a mistake (for example, forgotten income from an international client), file the correction and immediately pay the difference in the tax to stop the interest from piling up.
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4. How to avoid problems next year?
The best defense against fines is good organization. Freelancers often have chaotic income from various sources, which makes omissions easy.
- Gather all invoices, PayPal/Revolut statements, and contracts in one place every month, not the day before the deadline.
- To make sure you are following the correct steps at the end of each year, read our detailed guide: How to do year-end closing for freelancers?.
Conclusion
A wrong or late tax return is not the end of the world. The system provides mechanisms through which taxpayers in good faith can clear up their mistakes. The key is in a fast reaction – the sooner you file the missing document or correct the wrong one, the more minimal the financial consequences for you will be.
