Peace of mind is guaranteed: if you ever get a fine from AT or Social Security for a declaration filed with FIZ, we pay it.
Each statement is verified by a certified accountant
Response in less than 24h for urgent requests
Full coverage of Portuguese tax law
Tax Guarantee —
up to 1.500€ covered per declaration |
FIZ is the first provider in Portugal to offer a tax guarantee |
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Mistakes are stopped before they happen. |
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How Tax Shield works |
Receive a notice from AT or Social Security → send it to FIZ |
We verify eligibility and handle the case with our specialists
We pay the covered fine (within your plan limit) and stay with you until it’s resolved
What is covered |
Fines/penalties imposed by the Tax Authority (AT) or by Social Security that result from an error or omission in a declaration filed through FIZ. |
Applies even if the mistake was yours — provided it was not intentional fraud and eligibility criteria were met. |
Coverage limits |
Per declaration |
Up to 500 €
in our Auto and Auto Pro plans
Up to 1.500 €
in our Prime and Prime Pro plans
What is not covered |
Additional/recalculated taxes (only the fine/penaltyis covered). |
Interest on overdue taxes. |
Fraud or deliberate tax evasion, as determined by the authorities. |
Non-submission or repeated late submission of declarations. |
Declarations not filed through FIZ or edited outside FIZ after submission. |
Cases outside the validity window (e.g., fines issued more than 365 days after submission). |
Failure to meet the eligibility criteria shown in the app (e.g., skipping required reviews or ignoring critical warnings). |
Beyond automation: |
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Accountant
Prepares and adjusts reports instantly.
Tax specialist
Interprets requests from AT or Social Security, ensuring compliance without overpaying.
Lawyer
Drafts official requests and letters.
Priority contact
Every case answered
within 24h.
Full case management
We stay with you until
the issue is resolved.
Peace of mind
We know the rules,
the pitfalls, and the shortcuts.
Before & After
Before / After — without Tax Shield vs. with FIZ Tax Shield |
Unexpected request from AT
João received an unexpected letter from the AT and didn’t know where to start.
The Tax Shield team prepared the required response within 48 hours — no fines, no stress.
Social Security fine
Social Security miscalculated the contribution and issued a fine.
Our team prepared the formal documentation proving the declaration was correctly submitted. Social Security accepted it and the fine was cancelled.
Compliance question from AT
Sofia received a complex compliance question from the AT and didn’t know the legal answer.
Our lawyer drafted the official response, which Sofia submitted to the AT. The case was closed in 3 days.
Frequently Asked Questions
What does the FIZ Tax Shield cover?
What does the FIZ Tax Shield cover?
If you ever get fined by AT or Social Security because of an error or submission in a declaration you filed with FIZ, we’ve got you covered.
What is not covered?
What is not covered?
We’re with you on all honest mistakes — but not on cases of fraud or undelivered declarations.
Who is covered?
Who is covered?
All users on the Auto or Prime plan who submit declarations through the FIZ app/web.
If I make a mistake, am I still covered?
If I make a mistake, am I still covered?
Sim. Desde que não seja considerado fraude intencional pela AT, nós cobrimos a coima.
Does the Tax Shield also pay the taxes due?
Does the Tax Shield also pay the taxes due?
Não. Nós cobrimos apenas a coima. O imposto devido continua a ser responsabilidade do utilizador.
AT № 3041
NIPC 517696835
1200-082, Lisbon, Cais do Tojo 24