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A Simple Guide to Small Business Corporation Tax in Portugal

By Rauva

Published on 31 January 2024

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If you're a small business owner setting up shop in Portugal, it's essential to understand the ins and outs of corporation taxes. Portugal offers an enticing business environment, but navigating its tax system can be a bit challenging, especially if you're new to entrepreneurship and the Portuguese language.

This guide will break down what corporation tax is, how and when you need to pay it, and provide practical tips on calculating and reducing your tax liability.

What is Corporation Tax?

Corporation tax, known as Imposto sobre o Rendimento das Pessoas Coletivas (IRC) in Portuguese, is a tax on the profits of your business.

As a small business owner, you're required to pay this tax to the Portuguese government. It's essential to understand that your business entity, such as a limited liability company (LLC) or a sole proprietorship, will determine how you're taxed.

How and When to Pay Corporation Tax

Reporting Period

In Portugal, corporations must report their profits and pay IRC on an annual basis. The reporting period typically corresponds to the calendar year, running from January 1st to December 31st, with your corporation tax payment being due the following year.

Filing and Payment

To fulfill your tax obligations, you need to file an annual tax return and pay any owed taxes by the deadline. The deadline is usually May 31st of the following year. However, this date may change, so it's essential to stay updated with the latest tax regulations.

Payment Methods

Corporation tax can be paid through the Portuguese Tax and Customs Authority (Autoridade Tributária e Aduaneira) website, by bank transfer, or in person at a tax office.
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Calculating Corporation Tax

Calculating corporation tax can be complex, but here's a simplified example:

Step 1: Calculate Your Taxable Income

Start with your business's total revenue and deduct allowable expenses such as salaries, rent, utilities, and depreciation. The resulting figure is your taxable income.

Step 2: Apply the Applicable Tax Rate

Portugal has different corporate tax rates depending on the region and the type of business. For instance, the standard rate is 21% for mainland Portugal. Calculate your tax liability by applying this rate to your taxable income.

Step 3: Account for Deductions and Credits

Portugal offers various tax deductions and credits that can reduce your tax liability. For example, small and medium-sized businesses may qualify for a reduced tax rate of 17% on the first €25,000 of taxable income. Investigate these opportunities to lower your tax bill.

Reducing Your Corporation Tax Liability

Reducing your corporation tax liability is a smart way to optimize your business's finances. Here are some strategies to consider:

1. Take Advantage of Tax Deductions: Be meticulous about recording your business expenses. Common deductible expenses include employee salaries, rent, interest on loans, and depreciation.

2. Opt for the Appropriate Legal Structure: Choosing the right business entity and activity can impact your tax liability. Consult with a tax professional to determine whether a sole proprietorship, LDA, or another structure is most tax-efficient for your business.

3. Explore Investment Incentives: Portugal offers various investment incentives and tax breaks for certain industries and regions. Research if your business qualifies for these benefits.

4. Consider International Tax Treaties: If you operate internationally, Portugal has tax treaties with numerous countries to prevent double taxation. Ensure you're taking full advantage of these treaties.

5. Engage a Tax Professional: Tax laws can be complex and subject to change. Hiring a tax professional with expertise in Portuguese tax regulations can help you navigate the system and minimize your tax liability.


Along with VAT, understanding corporation taxes in Portugal is crucial for small business owners. By grasping the basics of what corporation tax is, when and how to pay it, and employing smart strategies to calculate and reduce your liability, you can optimize your business's financial health in this appealing European business destination. If you're ever uncertain about your tax obligations, seeking advice from a tax expert is a wise investment to ensure you're on the right financial track.
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Written by Rauva

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