Mandatory Lease Registration With the AT: The 30-Day Rule

Every Portuguese lease must be registered with the Tax Authority (AT) within 30 days of signing. Miss it and you face penalties — and a weaker hand if you ever need to evict.

The problem

The 30-day window is short and easy to miss, especially for a remote landlord juggling the deal from another country. By the time it surfaces, you’re already non-compliant.

What you need to know

• Deadline — 30 days from signing the lease.
• Where — the Finanças (AT) portal, with contract and party details.
• Stamp duty — settled at registration.
• Consequence of missing it — penalties and a weaker basis for a future eviction.

Protection that costs only attention

An unregistered lease complicates eviction and adds fines to the loss. Hitting the deadline is free protection.

Frequently asked questions

Who is responsible for registering?

The obligation typically falls on the landlord, via the Finanças portal, within the 30-day window.