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Compensatory Interest vs Late-Payment Interest in Portugal: What’s the Difference?
🧮 Compensatory Interest (*Juros Compensatórios*)
What it is: interest that compensates the State when, because of the taxpayer, a tax was paid late or less than it should have been — or a refund was received in excess.
When it applies:
- A tax return was filed late, leading to late payment
- Tax that should have been withheld or self-assessed wasn’t paid on time (for example, Stamp Duty on a lease)
- An error in a return reduced the tax paid
- A refund was obtained that wasn’t due
Rate: 4% per year (the legal civil interest rate)
Period: from the end of the deadline for payment (or the date of the excess refund) until the date the error is detected or corrected — with legal limits on the period that can be charged.
⏰ Late-Payment Interest (*Juros de Mora*)
What it is: interest charged when a tax that has already been assessed (with a payment slip and a deadline) isn’t paid by that deadline.
When it applies:
- You received an IRS, IMI or other tax assessment and didn’t pay by the due date
- Any tax debt after the voluntary payment period ends
Rate for 2026: 7.221% per year (set annually by the Treasury and Public Credit Agency — IGCP). In 2025, it was 8.309%.
Period: from the day after the payment deadline until full payment, generally up to a maximum of 3 years (longer in some instalment plans).
🔍 The Key Differences
- Moment: compensatory interest relates to before the tax is assessed; late-payment interest relates to after the payment deadline of an assessment
- Cause: compensatory interest arises from a delay or error attributable to the taxpayer in fulfilling obligations; late-payment interest arises from not paying a debt that is already due
- Rate: 4% vs 7.221% (2026)
- Can they both apply? Yes — but not for the same period. Compensatory interest covers the period until the assessment; late-payment interest covers the period after the payment deadline.
📘 Example
A landlord forgets to pay Stamp Duty on a lease due in January 2025. The Tax Authority detects it and issues an assessment in March 2026, with payment due by April 2026:
- Compensatory interest (4%) from January 2025 to the assessment
- If the landlord doesn’t pay by April 2026 → late-payment interest (7.221%) from then on
- Plus any fine for the late communication
⚖️ And When the Tax Authority Is Late?
Interest works both ways. If the Tax Authority makes an error that leads you to pay too much, or delays a refund beyond the legal deadline, you may be entitled to indemnity interest (juros indemnizatórios) — often recognised in successful objections or appeals.
💡 Practical Tips
- Pay assessments on time, even if you plan to object — or request a suspension with a guarantee.
- Correct errors quickly — compensatory interest keeps running until the error is fixed.
- Check the interest in any assessment — the periods and rates must be correct.
- Ask for instalments if you can’t pay in full — it can limit additional costs.
🚀 Final Considerations
Compensatory interest compensates for a delay before the tax is assessed; late-payment interest applies when you don’t pay an assessment on time. Knowing the difference helps you check the bill — and avoid paying more than you should.
📢 Expert Advice: Check the interest periods and rates on every assessment. Errors happen, and they can be challenged.
Received a tax assessment with interest? Step Inside Portugal’s tax team can review it and advise on the next steps — find out more about our tax services here. ✨
This article is for general information only and doesn’t constitute tax advice. Interest rates are updated annually; confirm the rate applicable to your period.
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