Most people moving to Portugal with a UK or US pension assume the tax treaty will protect them. It does — but not in the way most people expect, and the protections work differently depending on whether your pension is private, state, or government service. Getting this wrong means paying tax twice, or paying tax in the wrong country entirely.
This guide covers how both the UK-Portugal and the US-Portugal double taxation treaties apply to pensions in 2026, what has changed with the new UK treaty now in force for 2026, and the practical steps you need to take so the right country taxes the right income.
Quick Answer: If you are tax resident in Portugal, most UK private pensions and the UK State Pension are normally taxed in Portugal under the 2025 UK-Portugal treaty. UK government service pensions, such as many civil service or military pensions, usually stay taxable in the UK. For US retirees, 401(k) and IRA income is generally treated as Portuguese-taxable pension income, but US citizens and green card holders still have US filing duties because of the treaty’s saving clause. US Social Security is more complicated: the US and Portugal may both have taxing rights, with relief claimed through the tax return process. In Portugal, foreign pension income is declared each year in Modelo 3, usually in Anexo J.
Quick Pension Tax Table
Use this as a first check before going deeper into the article.
| Pension type | Usually taxed where if you are Portugal tax resident? | What to watch |
|---|---|---|
| UK private pension / occupational pension | Portugal | HMRC may keep withholding until you apply for treaty relief |
| UK SIPP in drawdown | Portugal | Same NT code process as other UK private pensions |
| UK State Pension | Portugal | It is not normally treated as a government service pension |
| UK civil service / military / police pension | UK | Still declare it in Portugal and apply the treaty exemption correctly |
| UK teachers’ pension | Often UK, but check the scheme | Public authority status matters |
| NHS pension | Depends on payer and scheme | Do not assume it is automatically UK-only |
| US 401(k) / IRA | Usually Portugal, but US filing still required | Form 1040 and sometimes Form 8833 may still be needed |
| US Social Security | US and Portugal may both tax it | Relief usually depends on foreign tax credit rules |
| US federal government pension | Usually US | Still consider Portuguese reporting rules |
What a Double Taxation Treaty Actually Does
A double taxation treaty (DTT) doesn’t mean you pay no tax. It decides which country gets to tax each type of income — and sometimes both countries retain some right to tax.
Portugal taxes its tax residents on worldwide income. Without a treaty, both countries could tax the same pension. The treaty steps in to divide those taxing rights by income type, with separate rules for private pensions, government service pensions, and social security.
There are two treaties that matter for most English-speaking expats in Portugal:
1. The UK-Portugal Double Taxation Convention (2025) — signed 15 September 2025 and entered into force on 29 December 2025. In Portugal, it applies from 1 January 2026 for covered taxes. In the UK, the dates are split: 1 January 2026 for taxes withheld at source, 6 April 2026 for Income Tax and Capital Gains Tax, and 1 April 2026 for Corporation Tax. This replaces the old 1968 treaty that had been in place for more than 50 years.
2. The US-Portugal Tax Treaty (1994) — still in force, has not been renegotiated. Older in structure, with a “saving clause” that creates a complication for US citizens that does not exist in the UK treaty.
The New UK-Portugal Treaty: What Changed in 2026
The 1968 UK-Portugal treaty was outdated in several ways. The new one, negotiated post-Brexit, rewrites the rules on pensions, capital gains, anti-abuse provisions, and dispute resolution.
For retirees, the pension articles are what matter most.
Private Pensions, Occupational Pensions, and SIPPs
Under Article 17 of the 2025 convention, private pensions paid to a Portuguese tax resident are generally taxable only in Portugal. In plain English, Portugal normally gets the taxing right, not the UK. This applies to:
- Defined contribution and defined benefit occupational pensions
- SIPPs (Self-Invested Personal Pensions) in drawdown
- Personal pensions and annuities
- QROPS and international pension arrangements where the payment reaches you as a Portuguese resident
In practice, this should mean your UK pension provider pays the gross amount to you, with no UK income tax deducted — but only if you have obtained the correct HMRC authorisation. The treaty doesn’t make it happen automatically.
The step most people miss: You need to submit Form DT-Individual to HMRC. This is the application for a No Tax (NT) code, which instructs your UK pension provider to stop deducting UK income tax at source. HMRC processes the form and issues the NT code directly to the provider. A phone call to the International Pension Centre is not sufficient — the form is required.
Until the NT code is in place, your provider will continue withholding UK tax. You can reclaim it, but the process is slower and more complicated than getting the code upfront.
The UK State Pension
The UK State Pension is taxable only in Portugal under the new treaty. Despite being paid by the UK government, it does not qualify as a “government service pension” under Article 18 — it falls under Article 17 alongside private pensions. For Portuguese tax residents, Portugal normally gets the taxing right.
The same NT code process applies. HMRC and the Department for Work and Pensions operate separately — if you receive State Pension via DWP and private pension income via a provider, you may need separate applications.
Government Service Pensions — The Exception That Catches People Out
Under Article 18 of the 2025 treaty, pensions paid for past services to the UK government are taxable only in the UK. Portugal cannot tax them.
This covers civil service pensions, military pensions, police and fire service pensions, and teachers’ pensions where the employer was a public authority. If you receive one of these, Portugal will not tax it — but you must still declare it on your Portuguese Modelo 3, because the Portuguese Tax Authority (Autoridade Tributária e Aduaneira) needs to see that you are correctly applying the treaty exemption.
There is one important exception to the government service rule: if you are both a Portuguese tax resident and a Portuguese national, the government service pension may become taxable in Portugal instead. For most British retirees, this doesn’t apply.
NHS pensions need specific attention. This is one of the easiest places to make a mistake. Some NHS-related pensions may not be treated as government service pensions, depending on who pays the pension and how the scheme is structured. For example, HMRC guidance has historically treated some NHS pensions differently when paid by CAPITA or the Paymaster General’s Office, while local authority-linked pensions can be different. So do not assume “NHS = UK-only” without checking your exact scheme.
| Pension Type | Taxed Where? | Notes |
|---|---|---|
| UK private / occupational pension | Portugal only | Submit Form DT-Individual for NT code |
| UK SIPP (drawdown) | Portugal only | Same — NT code required |
| UK State Pension | Portugal only | DWP notified separately from HMRC |
| UK civil service / military / police pension | UK only | Declare in Modelo 3 with treaty exemption note |
| Teachers’ pension (public authority) | UK only | Verify scheme classification |
| NHS pension | Depends on payer/scheme | Do not assume UK-only treatment without checking |
How Portugal Taxes Pension Income in 2026
Once you’ve established that Portugal has the right to tax your pension, the income is subject to Portuguese progressive IRS (Imposto sobre o Rendimento das Pessoas Singulares) rates.
For 2026, Portuguese tax residents are taxed at progressive IRS rates that run from 12.5% to 48%, after the deductions and allowances that apply to their case. Pension income may also benefit from Category H pension deductions, but the exact deduction depends on the tax year and your full return, so do not rely on old screenshots or forum numbers.
Portugal also has a solidarity surcharge for higher incomes. The practical point is simple: your final tax is not just “pension amount x one rate”. It depends on your total taxable income, deductions, household situation, and whether any treaty exemption or foreign tax credit applies.
For example, a British retiree receiving a UK private pension and the UK State Pension may now mainly be dealing with Portugal for tax on those pensions. But if the UK provider keeps withholding tax because the HMRC relief process was not completed, the person may need to reclaim UK tax later. That is why the paperwork matters as much as the treaty wording.
The Portuguese tax year runs on a calendar year basis. You declare income earned in 2025 on the Modelo 3 return filed between 1 April and 30 June 2026. Foreign pension income goes in Anexo J. If you are new to this process, our IRS Portugal guide for foreigners explains Modelo 3, Anexo J, and the April-to-June filing window in more detail.
IFICI Does Not Apply to Pensions
If you arrived in Portugal after January 2024 and looked into the IFICI (Incentivo Fiscal à Investigação Científica e Inovação) regime — the regime that replaced NHR — here is the most important thing to know: IFICI does not cover pension income.
Category H income (pensions) is explicitly excluded from IFICI benefits. Retirees cannot use IFICI to reduce their tax burden on pension income. If you registered under IFICI believing you would pay a flat rate on foreign pensions, this is an error worth correcting before your first filing.
Expats who registered under the original NHR (Non-Habitual Resident) regime before January 2024 retain their benefits for the full 10-year period, including the 10% flat rate on qualifying foreign pension income. If your NHR registration is still active, check your confirmation date — the clock started from your first year of Portuguese tax residency. For a full breakdown of what IFICI covers and who actually qualifies, see our guide to what replaced NHR in Portugal.
The US-Portugal Treaty: Older, More Complex, With a Critical Catch
The US-Portugal Income Tax Treaty has been in force since 1994. It was the first income tax treaty between the two countries, and unlike the new UK treaty, it has not been renegotiated.
For US citizens and green card holders, the treaty creates a particular complication: the saving clause (Article 1). This allows the United States to tax its citizens and permanent residents as if the treaty did not exist. No equivalent clause exists in the new UK-Portugal treaty. This means US nationals in Portugal cannot simply rely on treaty provisions to eliminate US tax — they need additional mechanisms.
Private Pensions: 401(k), IRA, and Similar
Under Article 18 of the US-Portugal treaty, private pension income paid to a Portuguese tax resident is generally treated as taxable in Portugal. This can include 401(k) distributions, IRA withdrawals, and annuities from private US pension plans.
In practice, the US may still withhold tax on distributions depending on the administrator and how treaty claims are filed. US nationals claiming treaty benefits on pension income must file Form 8833 (Treaty-Based Return Position Disclosure) with their annual IRS return. This is not optional — failing to file Form 8833 when you’re claiming a treaty position can result in penalties.
Because the saving clause applies, many US expats in Portugal also look at the Foreign Tax Credit route using Form 1116 for Portuguese tax paid. This does not mean the result is automatic. The credit has limits and depends on the income type, exchange rates, and how the return is prepared.
US Social Security Benefits
US Social Security is not treated like the UK State Pension. The US may tax it, and Portugal may also tax it if you are Portuguese tax resident.
So the practical protection is usually not a simple exemption. It is relief through the tax return process, often through foreign tax credit rules. In Portugal, that normally means reporting the income in Modelo 3 / Anexo J and making sure any tax paid abroad is claimed in the correct place.
This is one of the more sensitive areas of US-Portugal tax planning. The right answer depends on citizenship, residence, total income, and how the US return is filed. A simple blog article can explain the shape of the rule, but this is a case where personalised tax advice is genuinely useful.
The WEP repeal matters here. The Windfall Elimination Provision (WEP) was repealed on 5 January 2025 through the Social Security Fairness Act, retroactive to January 2024. Americans receiving both a Portuguese pension and US Social Security who had their benefits reduced under WEP should have received an SSA recalculation. If you haven’t heard from SSA about a retroactive increase, contact the Federal Benefits Unit at the US Embassy in Lisbon.
Government Pensions: Federal and State
US government pensions (federal civil service, military, state government) have their own treatment under the treaty, generally preserved to the source country. Federal US government pensions paid to a Portuguese resident are typically taxable only in the US. But this is an area where the saving clause interacts with treaty provisions in ways that differ from the cleaner UK arrangement — confirm with a US-qualified CPA or international tax adviser.
| Income Type | Primary Taxing Right | US Filing Requirement |
|---|---|---|
| US private pension (401k, IRA) | Portugal | Form 8833 + Form 1040 |
| US Social Security | Both (shared rights) | Form 1040 + Modelo 3 Anexo J |
| US federal government pension | US | Form 1040 |
| US dividends | Portugal (with US withholding) | Form 1116 credit claim |
Law vs. Reality: What the Official Guidance Doesn’t Tell You
| What the official guidance says | What actually happens in practice |
|---|---|
| Submit Form DT-Individual to stop UK withholding | Processing takes 4–12 weeks. Your pension provider may continue withholding until they receive confirmation. Keep evidence of your submission date |
| Private pensions taxable only in Portugal | Some providers continue withholding UK tax until the NT code arrives. You’ll need to reclaim from HMRC — R43 form, through the Non-Residents Team |
| File Modelo 3 between April 1 and June 30 | Portal das Finanças crashes around the May deadline every year. File in April if you can |
| IFICI replaces NHR for new arrivals | IFICI has no pension benefit. Many tax advisers in Portugal are still catching clients who signed up for IFICI under the mistaken belief that pension income would qualify |
| WEP was eliminated in January 2025 | SSA has been issuing retroactive payments, but not everyone has received them. Check your benefits statement |
Establishing Portuguese Tax Residency: When the Clock Starts
The treaties apply to your pension income only from the point you are a Portuguese tax resident. You become a tax resident if either of the following is true:
- You spend more than 183 days in Portugal in a calendar year (days do not need to be consecutive)
- You maintain a habitual residence in Portugal at any point during the year that indicates an intent to make it your permanent home
Portugal’s residency test operates on a calendar year basis. The UK tax year runs April 6 to April 5. This timing difference has real consequences if you move mid-year.
If you establish Portuguese residency on 31 December, you are a Portuguese resident for that entire calendar year. UK residency rules operate differently — you may be non-UK-resident from an earlier date under the UK’s Statutory Residence Test. The period between losing UK residency and gaining full Portuguese residency for treaty purposes needs to be mapped carefully, especially in the year of departure. This is exactly the kind of one-way door that is much more expensive to fix after the fact than before.
Common Mistakes
Mistake: Assuming the NT code process is automatic
The pension treaty provision doesn’t instruct your UK provider to do anything. HMRC doesn’t know you’ve moved to Portugal until you tell them. Form DT-Individual is the mechanism — it goes to HMRC’s Charities, Savings and International department. Your provider continues withholding until they receive an NT code. Start this process before you establish Portuguese residency if you can, because getting the timing right prevents an overpayment situation that can take months to resolve.
Mistake: Treating NHS pensions as definitively UK-only taxed
NHS pension holders often assume they fall under the government service rule. Some may; some may not. The safest approach is to check the payer and scheme before filing. If the pension is paid through one route it may be treated differently from another. This is too important to guess from the word “NHS” alone.
Mistake: Registering for IFICI believing it covers pension income
IFICI (Category H income) exclusion is not hidden in the small print — it is in the published legislation. But several tax advisers were marketing IFICI to retirees in 2024 and early 2025 as a straight swap for NHR without flagging this limitation. If you registered under IFICI and have pension income as your primary source, your Portuguese tax exposure is materially higher than you may have been told. Get a second opinion before your first filing.
Mistake: Not filing Form 8833 when claiming US treaty benefits
US nationals who claim that their private pension is taxable only in Portugal under the treaty must disclose this position to the IRS on Form 8833. The form is a disclosure requirement — not filing it while claiming treaty benefits is a compliance failure, separate from the underlying tax position. The penalty for failure to file Form 8833 starts at $1,000 per year.
Mistake: Assuming Portuguese Finanças knows about your UK NT code
Your UK pension provider has an NT code. Portuguese tax authorities have no visibility into what happens with UK tax deductions. You still declare the full gross pension amount on your Modelo 3 in Portugal, and Portuguese IRS is calculated on the gross. The NT code stops UK withholding; it doesn’t reduce your Portuguese obligation.
Real Scenarios
Retired UK teacher, government pension plus State Pension
A retired secondary school teacher in Porto receives a teachers’ pension from the Teachers’ Pension Scheme and the UK State Pension. She assumed both would be UK-taxed because both involve the state.
The State Pension falls under Article 17 — taxable only in Portugal. The teachers’ pension, paid in respect of services as a public authority employee, falls under Article 18 — taxable only in the UK. She should have a NT code for the State Pension only. Her Modelo 3 needs to show the teachers’ pension declared but exempt via the treaty (for Portuguese transparency purposes), and the State Pension included in her Portuguese taxable income. Getting this the wrong way round — claiming both as UK-only — would likely trigger a query from Autoridade Tributária.
Retired US couple with mixed pension sources
A retired couple from California — one with a US federal pension, the other with a 401(k) and Social Security — moved to the Algarve in 2025. The federal pension is taxable only in the US; the 401(k) distributions are taxable only in Portugal. Social Security has shared taxing rights. They filed Portuguese Modelo 3 returns declaring the 401(k) and Social Security income; filed Form 1040 with Form 1116 (Foreign Tax Credit) for the Portuguese tax paid on the 401(k); and reported the federal pension on their US return only. They also checked with SSA about WEP repeal — the partner with a combined pension/Social Security income received a retroactive payment adjustment going back to January 2024.
UK retiree who moved mid-year and got the timing wrong
A retired engineer moved to the Algarve in June 2025 and established habitual Portuguese residency that month. He submitted Form DT-Individual in October, by which point four months of pension income had been withheld by UK providers. He reclaimed the overpayment via HMRC’s R43 process, which took approximately nine months to resolve and required additional documentation including proof of his Portuguese residency (NIF certificate, Portuguese property rental agreement). The lesson is not that reclaiming is impossible — it is — but that the upfront process is faster by months.
Pro Tips
Apply for Form DT-Individual before you establish residency, not after. You can submit it in anticipation of residency. HMRC’s processing time means submitting the day you land guarantees a gap.
Get certified proof of your Portuguese tax residency. For HMRC and for reclaim purposes, you’ll need a residence certificate issued by the Portal das Finanças or your local Finanças office. Your NIF alone is not sufficient evidence — the certificate should state your registered fiscal address and your status as a tax resident.
Declare everything, even what’s treaty-exempt. The Autoridade Tributária wants to see the full picture and verify you’ve applied the treaty correctly. Income that is exempt from Portuguese tax under a treaty still appears in your Modelo 3 — typically in Anexo J — with the exemption noted. Missing it entirely is a compliance gap.
The US saving clause doesn’t eliminate credits. US nationals in Portugal rarely pay net US tax at the end of the year because the FTC from Portuguese taxes typically covers the bill. But you still need to file a Form 1040 every year, including FBAR (FinCEN 114) if Portuguese accounts exceed $10,000 at any point during the year, and Form 8938 (FATCA) for foreign assets above $200,000 for expats abroad.
Check your NHR status if you arrived before 2024. If you registered under the original NHR regime and have confirmed status, your 10% flat rate on qualifying foreign pensions applies for the remainder of your 10-year period. The end date depends on which year you first registered. Log in to Portal das Finanças and check under your personal tax profile to confirm.
Frequently Asked Questions
Is my UK private pension taxed in the UK or Portugal if I live in Portugal?
Under the 2025 UK-Portugal Double Taxation Convention, UK private pensions paid to a Portuguese tax resident are generally taxable in Portugal, not the UK. But your pension provider may still withhold UK tax until HMRC issues a No Tax (NT) code. You normally apply for this using Form DT-Individual.
What is Form DT-Individual and where do I send it?
Form DT-Individual is HMRC’s form for claiming treaty relief on UK pension income when you are resident in another country. It must be submitted to HMRC’s Charities, Savings and International department. Your Portuguese tax authority may need to stamp or certify part of it confirming your residency. Download it from GOV.UK’s Portugal tax treaties page.
Is the UK State Pension taxable in Portugal?
Yes. Under the 2025 treaty, the UK State Pension is taxable only in Portugal for Portuguese tax residents — it does not qualify as a government service pension. DWP will continue paying the gross amount once an NT code is in place; you declare it as income on your Portuguese Modelo 3.
Are UK government service pensions (civil service, military) taxed in Portugal?
No. Under Article 18 of the 2025 treaty, pensions paid for government service are taxable only in the UK. You still declare them on your Portuguese Modelo 3 for transparency, with the treaty exemption noted. The exception is if you hold both Portuguese residency and Portuguese nationality — in that case, Portugal may claim the right to tax.
How is my US 401(k) taxed if I live in Portugal?
Under Article 18 of the US-Portugal treaty, 401(k) distributions and IRA withdrawals are generally treated as pension income taxable in Portugal if you are Portuguese tax resident. But US citizens and green card holders still need to file a US Form 1040, and treaty positions may need to be disclosed on Form 8833.
Does the US-Portugal treaty cover Social Security?
US Social Security can be taxed by the US, and Portugal may also tax it if you are Portuguese tax resident. The practical protection is usually relief through foreign tax credit rules, not a simple full exemption. The result depends on your wider return, so this is one area where professional advice is strongly recommended.
Was the WEP (Windfall Elimination Provision) repealed?
Yes. The WEP was repealed on 5 January 2025 through the Social Security Fairness Act, retroactive to January 2024. Americans receiving both a Portuguese pension and US Social Security who previously had benefits reduced under WEP should have received an SSA recalculation and retroactive increase. Contact the Federal Benefits Unit at the US Embassy in Lisbon if you haven’t received confirmation.
When do I file my Portuguese tax return declaring pension income?
The Modelo 3 return for income earned in 2025 is filed between 1 April and 30 June 2026 through Portal das Finanças. Foreign pension income is declared in Anexo J. File as early in April as possible — the system is consistently under strain in May and June.
Does IFICI (the NHR replacement) help retirees with foreign pension income?
No. IFICI excludes pension income (Category H) from its benefits. The regime is targeted at qualified professionals in science, technology, and innovation. Retirees cannot use it to reduce their pension tax burden. The original NHR regime (for those registered before January 2024) included a 10% flat rate on qualifying foreign pensions for the full 10-year period — if you hold that status, it still applies.
Do I need to pay Portuguese social security on my UK or US pension?
No. Pension income does not trigger Portuguese Segurança Social contributions. The US-Portugal Totalization Agreement also prevents dual social security contributions for Americans who remain in the system. Portuguese social security (NISS) contributions only apply to active employment or self-employment income.
What Portuguese tax rate applies to my pension?
For 2026, Portuguese tax residents are taxed under progressive IRS rates from 12.5% to 48%, after the deductions and allowances that apply to the return. Pension income may benefit from Category H deductions, but the final effective rate depends on your total taxable income, household position, and any treaty relief or foreign tax credit claimed.
Can I reclaim UK tax already withheld if I didn’t apply for an NT code in time?
Yes. Use HMRC’s R43 form (Claim for repayment of UK tax when you live outside the UK). You’ll need evidence of Portuguese tax residency — a certificate from Finanças, not just your NIF — and documentation of the pension payments and tax withheld. HMRC’s Non-Residents Team handles these claims; allow several months for processing.
The single most important thing about double taxation treaties is that they don’t enforce themselves. The UK treaty gives Portugal the right to tax your pension — but your provider keeps withholding until you file the right form with HMRC. The US treaty helps — but the saving clause means you still file a US return every year. Neither treaty removes Portugal’s right to know about the income on your Modelo 3.
Your first step, before any other planning, is to confirm your Portuguese tax residency registration at Portal das Finanças, then contact HMRC (for UK nationals) or your plan administrator (for US nationals) with the correct treaty documentation. If you’re reading this before your move, you are ahead of the curve — most people start asking these questions after their first Portuguese tax filing.
For how Portugal taxes your other income sources, see our guide to filing your IRS return in Portugal — it covers Modelo 3 structure, deadlines, and the full set of income categories. And if you are still sorting residency itself, the D7 visa guide covers the income requirements and path to the residence permit that establishes your status here.