Many entrepreneurs, freelancers, and digital business owners operate through a US Limited Liability Company (LLC). However, when the owner becomes a tax resident in Portugal, the tax treatment of LLC income can become complex.

The key issue is that Portugal and the United States treat LLCs differently for tax purposes. Understanding this difference is essential to avoid compliance issues or unexpected tax liabilities.

This article explains how US LLC income is taxed in Portugal, based on the Portuguese Personal Income Tax Code (CIRS) and official binding rulings issued by the Portuguese Tax Authority (Autoridade Tributária e Aduaneira).

1. How Portugal Taxes Foreign Income

Under Article 15 of the Portuguese Personal Income Tax Code (CIRS), Portuguese tax residents are taxed on their worldwide income.

This means that if you live in Portugal and qualify as a tax resident, you must declare:

Portuguese income
Foreign employment income
Foreign business profits
Dividends and investment income
Income received through foreign entities such as LLCs

This obligation applies regardless of where the income is paid or where the bank account is located.

In other words, keeping profits inside a foreign company does not automatically remove the obligation to declare the income in Portugal.

2. Why LLCs Create Tax Complexity

The complexity arises because LLCs are treated differently in the US and Portugal.

In the United States, most LLCs operate under pass-through taxation. This means:

The LLC itself does not pay corporate tax
Profits pass directly to the owners
Owners are taxed personally through a Schedule K-1

However, Portugal does not automatically recognize this pass-through treatment.

According to binding ruling Process 2360/2016, the Portuguese Tax Authority states that:

The US fiscal transparency regime cannot be automatically applied under Portuguese law
Income attributed to a Portuguese resident shareholder may instead be treated as capital income (dividends) under Article 5 of the CIRS

This difference is critical for tax compliance.

3. Portuguese Tax Treatment of LLC Profits

Under Portuguese tax law, profits from a US LLC may be classified as capital income.

According to Articles 5 and 72 of the CIRS, capital income is typically subject to:

Flat tax rate of 28%, or
Optional progressive taxation if aggregation is chosen

However, the final treatment depends on the structure of the LLC and the nature of the income.

4. The Role of the Portugal–US Double Tax Treaty

The Portugal–United States Double Tax Treaty (DTT) also plays an important role.

The treaty includes a special protocol clause covering entities such as LLCs.

According to the Portuguese Tax Authority (Process 23980):

Income derived through US transparent entities may fall under Article 24 – Other Income
This article grants shared taxing rights to both countries

Therefore:

The United States may tax the income
Portugal may also tax the income

To avoid double taxation, Portugal allows the use of the international double taxation relief mechanisms under Article 81 of the CIRS.

5. Methods to Eliminate Double Taxation

Portuguese tax law provides two possible methods:

Exemption Method

Under certain conditions, foreign income may be exempt in Portugal if it can be taxed in the source country.

This method was commonly applied under the Non-Habitual Resident (NHR) regime.

Foreign Tax Credit

If the exemption method does not apply, Portuguese residents may use a foreign tax credit.

This means:

The income is taxed in Portugal
Taxes already paid in the United States are credited against Portuguese tax

This prevents the same income from being taxed twice.

6. Do You Need to Declare LLC Income if Profits Stay in the Company?

This is one of the most common questions among entrepreneurs.

The answer depends on how the LLC is taxed in the United States.

Scenario 1 — Pass-Through LLC

If the LLC uses pass-through taxation and issues a Schedule K-1, profits are attributed to the owner regardless of distribution.

In this situation:

The income is considered earned by the owner
It must normally be declared in Portugal, even if the funds remain in the LLC bank account

Scenario 2 — LLC Taxed as a Corporation

Some LLCs elect to be taxed as a C-Corporation.

In this case:

The company pays corporate tax in the US
The owner only receives income when dividends are distributed

If profits remain in the company:

There may be no immediate personal income to declare in Portugal
Taxation generally occurs when dividends are distributed

7. Reporting LLC Income in the Portuguese Tax Return

If the income must be declared, Portuguese tax residents typically report it in:

Model 3 – Portuguese Personal Income Tax Return

Relevant annexes include:

Annex J – Foreign income
Annex L – Double taxation relief method

Documentation may include:

Schedule K-1
US tax return extracts
Evidence of taxes paid in the United States

8. Why Proper Structuring Is Essential

Many entrepreneurs create US LLCs for e-commerce, consulting, or dropshipping businesses.

However, once they move to Portugal, the tax treatment of the structure can change significantly.

Incorrect assumptions can lead to:

Undeclared foreign income
Tax corrections from the Portuguese Tax Authority
Penalties and interest

For this reason, it is important to review:

The type of LLC election
The operating agreement
The US tax treatment of the entity
The applicable double tax treaty rules

9. Final Thoughts

Operating a US LLC while living in Portugal is perfectly possible, but it requires careful tax analysis.

The key points are:

Portugal taxes residents on worldwide income
The US pass-through regime is not automatically recognized in Portugal
LLC income may be treated as capital income
The Portugal–US tax treaty determines how double taxation is avoided
The obligation to declare income often depends on whether profits are attributed to the owner

Because each structure is different, professional advice is strongly recommended before filing a tax return.

If you operate a US LLC while living in Portugal, reviewing the structure with a cross-border tax advisor can help ensure compliance and avoid unnecessary taxation.

GoalSeek provides advisory services for expatriates, freelancers, and international entrepreneurs managing US and Portuguese tax obligations.

How US LLC Income Is Taxed in Portugal: A Complete Guide for Tax Residents