For TI / ENI

For Accountants

Help

Invoicing

For TI / ENI

Social Security

VAT

Tax Shield

Plans

For Companies

For Accountants

Help

Iniciar sessão

Aderir ao FIZ

Tax Shield — Portugal’s first tax protection

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.

See all plans in detail

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

Your Tax Shield

FIZ is the first provider in Portugal offering tax guarantee

With FIZ, filing taxes means more than calculation and submission. It means protection on every declaration — because security isn’t optional, it’s our promise.

Zero-error
design

Zero-error design

Mistakes are stopped before they happen.

Smart
documents

Smart documents

Invoices and expenses are always checked for compliance.

Automated
checks

Automated checks

Every declaration is verified and validated instantly.

Tax Shield is more than a feature. It’s our mission: supporting and protecting you, your time, and your peace of mind.

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 Portuguese Tax Authority (AT) or Social Security that result from an error or omission in a declaration filed with FIZ.

Applies even if the mistake was yours — provided it was not intentional fraud and eligibility steps were followed.

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

See all plans in detail

What is not covered

Additional/recalculated taxes (only the fine/penalty is covered).

Interest on overdue taxes.

Fraud or deliberate tax evasion as determined by authorities.

Non-submission or repeated late submission of declarations.

Declarations not filed through FIZ or edited outside FIZ after filing.

Cases outside the validity window (e.g., fines issued more than 365 days after submission).

Failure to meet eligibility steps shown in the app (e.g., skipping required reviews or ignoring critical warnings).

Beyond automation: FIZ experts by your side

And even more: with FIZ, you never face the system alone — our expert team stands with you every step of the way.

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

Before

After

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.

Before

After

Social Security fine

After

Before

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.

Before

After

FIZ Tax Shield — peace of mind, guaranteed.

More than automation: real confidence. Tax Shield protects you from risk — with a guarantee of up to 1.500€ per declaration and expert support from accountants, tax specialists, and lawyers at your side.