What is AIMI and Who Has to Pay for It in Portugal

AIMI: The Tax That Could Surprise Homeowners in September

If you own several urban properties or land for construction, there is a tax that can appear in September and catch those who are unaware of the rules off guard: the AIMI - Additional to the Municipal Property Tax. Do not confuse it with IMI. This is an additional tax, and yes, it takes a lot of people by surprise.

🏠 What is AIMI?

Created in 2017, the AIMI applies to taxpayers with urban residential real estate assets or building land whose total value exceeds certain limits. Unlike the IMI, which is levied on each property individually, the AIMI considers the overall value of the properties held by each taxpayer on January 1 of the year in question.

👥 Who is subject to AIMI?

This tax applies to:

• Natural persons (individuals)

• Legal persons (companies)

• Undivided inheritances (not yet shared)

• Unincorporated entities (such as condominiums)

All urban residential properties and building land located in Portugal are covered. The following are excluded:

• Rustic buildings

• Properties allocated to commerce, industry or services

• Properties exempt from IMI in the previous year

• State Heritage, Autonomous Regions and Municipalities

📅 When is AIMI paid?

The AIMI is charged annually, based on the ownership of the properties on January 1st. The process is as follows:

• The Tax Authority calculates the tax in June

• Payment must be made by September 30, in a single installment

• The collection note is made available on the Finance Portal or sent by mail, according to the taxpayer's preference

📊 What are the applicable fees?

The rates vary depending on the type of taxpayer and the value of the estate: