Foreign Tax Credit for UK Landlords with Overseas Property: TIOPA 2010 Claim Mechanics

Own a flat in Lisbon, Marbella, Nice or anywhere else outside the UK, and two tax systems want a share of the same rent. The country where the property sits taxes it under its own non-resident landlord regime and under Article 6 of the bilateral treaty. The UK, because you live here, taxes the same rental on the arising basis. From 6 April 2025 the remittance basis is gone; the Foreign Income and Gains (FIG) regime gives a 4-year window for qualifying new arrivers, after which arising-basis taxation resumes in full. Left unmanaged, you pay tax on that income twice.

You stop that through the UK's foreign tax credit (FTC) framework: TIOPA 2010 Part 2, section 18 for treaty credit, section 9 for unilateral credit, and sections 36 and 40 to 42 for the credit limit. The credit is the lesser of (i) the foreign tax paid and (ii) the UK tax on the doubly taxed income. You claim it on SA106 (Foreign pages), with HS304 as the helpsheet.

The mechanics turn on one number you have to get right: the UK measure of the rental, computed under UK rules, which sets the cap on your credit. Get that wrong and you over-claim or under-claim. Take Helen, a UK-resident higher-rate taxpayer with a short-let Lisbon flat: €13,500 net rental, €3,375 Portuguese IRS, a UK tax cap of £4,576 on the UK measure, credit of £2,860, UK net liability £1,716. For the wider treaty framework, see our UK tax treaties framework guide; if you also let property in the UK, our landlord self-assessment filing step-by-step guide covers the SA105 side that runs alongside.

When does the foreign tax credit apply to you as a UK-resident landlord?

You are on the receiving end of the credit, not the giving end. The overseas country is the source state: it taxes the rent because the property is there. The UK is your residence state: it taxes the same rent because you live here, and it gives the credit. That direction matters, because the rules you work to are the UK's own credit framework in TIOPA 2010 Part 2, not the foreign country's.

Three things have to line up before the credit comes into play:

1. You are UK resident in the tax year. Per TIOPA 2010 s.18(1) (treaty) and s.9 (unilateral), the credit is for a UK resident. Whether you are resident is settled by the Statutory Residence Test under FA 2013 Sch 45.
2. The foreign rental is on your UK return. From 6 April 2025 that is automatic if you are on the arising basis (past the FIG window, or never on FIG). During the 4-year FIG window, foreign rental income is excluded from UK tax altogether, so there is nothing to credit.
3. The same rental has already been taxed where the property sits. Usually through that country's non-resident landlord regime (Portugal 25% flat, France barème scale plus social charges, Spain 19% for EU residents pre-Brexit or 24% non-EU post-Brexit, Italy IRES or IRPEF depending on landlord status).

When all three hold, the same income is taxed twice, and the credit is how you fix it.

TIOPA 2010 Part 2: the statutory framework

The Taxation (International and Other Provisions) Act 2010 Part 2 (sections 2 to 134) is the modern statutory framework for double taxation relief. Earlier provisions in ICTA 1988 (s.788 and s.790) were rewritten into TIOPA in 2010 without changing the underlying rules.

The four key sections for property landlords:

• Section 18 (Entitlement to credit under DTA). Where a bilateral treaty between the UK and the source country provides for credit relief in respect of foreign tax on the income concerned, credit is available against UK tax on the same income. Section 18 is the route for any treaty country, which means virtually every major property-owning destination for UK landlords.
• Section 9 (Unilateral relief). Where there is no treaty, or where the treaty does not cover the income or tax involved, unilateral credit may be available. HMRC INTM161030 cites the US state-tax example: the UK-US treaty covers federal income tax only, so US state income tax is relievable via s.9 unilateral credit rather than s.18 treaty credit. For property landlords, the relevant unilateral cases are typically state and local property taxes that fall outside the treaty's covered taxes.
• Sections 36 and 40 to 42 (Limit of credit). Credit is limited to the lesser of (a) the foreign tax paid and (b) the UK tax on the doubly taxed income computed under UK rules. The limit applies per item of income, not in aggregate. Excess foreign tax over the UK cap is not creditable in the current year; limited carry-forward applies in specific circumstances under sections 73 to 76.
• Section 27 (Deduction instead of credit). A UK resident may elect to deduct the foreign tax from the foreign-source income rather than claim credit against UK tax. Election is made on SA106.

Two of these establish whether you get a credit at all (s.18 or s.9), two cap how much (s.36 and ss.40 to 42), and one offers the fallback of a deduction instead (s.27). Everything operational flows from how they fit together.

HMRC's six basic principles for FTC

HMRC INTM161100 sets six principles that apply to every FTC claim, treaty or unilateral. Miss any one and the claim can fail, so it pays to take them one at a time.

Principle 1: source rule. The source of the income or gain must be in the country that has charged the tax. For rental, the source is the country where the property is situated, the same allocation that Article 6 of the bilateral treaty makes. There are limited exceptions: INTM161120 confirms the Crown Dependency carve-out (Isle of Man and Channel Islands), and INTM161130 lists treaty-specific concessions. With overseas property, you meet the source rule automatically where the foreign tax is the source country's own property tax on the rental.

Principle 2: basis of allowance. Credit is allowed against UK tax on the same item of income. The UK tax and the foreign tax must fall on the same income; partial overlap (say, foreign tax that also covers a slice of business income not on your UK rental) gives no credit on that slice. For a straightforward rental, the income matches cleanly.

Principle 3: residence of claimant. You must be UK resident for the tax year. If you arrive or leave part-way through, split-year treatment under FA 2013 Sch 45 Part 3 apportions the year, and the credit is available only for the UK-resident part. Our SRT landlord decision tree takes you through working out residence.

Principle 4: limit of credit. Your credit cannot exceed the lesser of the foreign tax and the UK tax on the UK measure of the doubly taxed income. This is the principle that matters most and the one most often got wrong. The UK measure is computed under UK rules, not foreign rules.

Principle 5: minimum foreign tax rule. Per HMRC INTM161250, credit is allowed only for the minimum foreign tax chargeable under both the laws of the foreign country AND the relevant treaty. Where the treaty cuts the foreign rate below the domestic rate, the treaty-reduced rate is what you can credit. It is easy to end up paying foreign tax at the full domestic rate because you did not invoke the treaty-reduced rate at the withholding stage abroad; that excess is not creditable against UK tax and you have to reclaim it from the foreign authority directly.

Principle 6: qualifying foreign taxes. The foreign tax must be similar in character to UK income tax or capital gains tax. INTM161300 and INTM161310 list qualifying taxes country by country. Rental income taxes qualify everywhere; municipal property occupation taxes (the council tax equivalents) generally do not.

The credit-limit calculation in detail

This is the calculation that decides how much of your foreign tax actually comes off your UK bill. Run it in this order, per TIOPA 2010 s.36 and HMRC INTM161210.

Step 1: identify the doubly-taxed item of income. For rental, that is the rent from the specific overseas property. Each property is its own item of income.

Step 2: compute the UK measure of that item. UK rules apply. If you hold the property in your own name, that means gross rental income, less UK-eligible expenses (letting fees, repairs and maintenance, accountancy, insurance, agent fees, ground rent), less capital allowances on qualifying plant and machinery, after applying the s.24 ITA 2007 finance cost restriction on mortgage interest (a basic-rate tax reducer rather than a full deduction). The result is the UK-measure rental income.

Step 3: compute the UK tax on that item. Apply your marginal rate to the UK measure. At higher rate that is 40% on the UK measure (less the s.24 basic-rate reducer on mortgage interest); at additional rate, 45%.

Step 4: identify the foreign tax paid on the same item. The foreign tax you actually paid abroad on the same rental, in the same tax period. Convert it to GBP using a HMRC-recognised exchange rate (usually the average rate for the year, from HMRC's monthly exchange rates table).

Step 5: take the lesser of foreign tax and UK tax. That is your credit. It comes off the UK tax on that item.

Step 6: where foreign tax exceeds the UK tax cap, the excess is not creditable. You lose it; there is no general carry-forward for excess foreign tax (the limited exceptions in TIOPA ss.73 to 76 apply mainly to companies). Look at the deduction alternative under s.27 only in the rare cases where the credit is unusable.

The source rule and the Crown Dependency exception

For rental, the source rule (Principle 1) is straightforward: the source state is the state where the property sits. Per INTM161110, the foreign tax has to be charged by the same country in which the income is sourced. For rent, that is the property's location, and the tax that country charges on the rent is your creditable foreign tax.

The exceptions start to matter once you hold property across several jurisdictions:

• Crown Dependencies. Per INTM161120, the Isle of Man, Jersey, and Guernsey are treated as if their tax is a foreign tax, even though they share UK statutory provenance. Rent from a Jersey or Manx property you own triggers FTC on the Jersey or Manx tax you pay, under the UK's modern bilateral treaties with each Crown Dependency. The 2018-onwards CD treaties contain Article 23-equivalent elimination provisions; pre-2018 cases sat under the historic concessional regime.
• Treaty-specific concessions. INTM161130 covers narrow exceptions where a treaty varies the source rule (typically older treaties or specific income categories).
• US state taxes. Per INTM161030, US state income tax is unilateral credit under TIOPA s.9, not treaty credit under s.18, because the UK-US treaty's covered-taxes article does not include state taxes.

For a plain overseas property (Portugal, France, Spain, Italy, UAE, Germany, Australia), you meet the source rule automatically and the credit comes via s.18 treaty credit.

How do you report the foreign tax credit on SA106?

The foreign property goes on SA106 (Foreign) in your Self Assessment, with HS304 (Non-residents claiming relief under DTAs) for the technical detail and HS302 (Dual residents) if you are also dual-resident under a treaty tie-breaker.

The SA106 boxes that matter for the 2026 tax year:

• Boxes 14 to 17: foreign property income. Gross rental per property, with currency conversion to GBP. Multiple properties are itemised by country.
• Boxes 18 to 22: allowable expenses on the UK measure. UK-rule expenses against the foreign rental: letting agent fees, repairs and maintenance, accountancy, insurance, ground rent, capital allowances on plant and machinery.
• Box 23: finance costs on the UK measure. Mortgage interest and other finance costs, restricted per s.24 ITA 2007 to a basic-rate tax reducer for residential property.
• Box 24: foreign tax for which credit is claimed. GBP equivalent of the foreign tax actually paid in the source country on the same rental, in the same period.
• Box 25: credit (or deduction) election. The election under s.18 (credit) or s.27 (deduction). Default is credit.

HS304 holds the detail behind those entries: confirming the source rule, reconciling the UK measure against the foreign measure, working the limit, and showing the unclaimed foreign tax where the cap bites.

The FIG regime overlay

If you have recently moved to the UK, the Foreign Income and Gains (FIG) regime can take the whole credit question off the table for a few years. In force from 6 April 2025 under Finance Act 2025, FIG replaced the old remittance basis with a 4-year window for qualifying new UK residents.

Where you stand depends on which of these you are:

• Qualifying new arriver. You have not been UK resident in any of the prior 10 tax years AND you become UK resident on or after 6 April 2025.
• FIG election. Within the 4-year window from the year you arrive, you can elect to keep foreign income and gains out of UK tax. You make the election on SA109 / SA106 alongside the residence pages.
• FIG-elected foreign rental. Out of UK tax, so there is no UK charge to credit against and the FTC mechanics simply do not apply. The foreign tax you pay where the property sits is the only tax on the rent.
• After the FIG window. From year 5 you are on the arising basis. The foreign rental is fully UK-assessed and FTC applies in full.
• Not electing. If you qualify but FIG is not worth it (typically because your foreign income is low and the cost of the election outweighs the relief), you are on the arising basis from year 1 and FTC applies in full from arrival.
• Already on the remittance basis. Transitional rules under FA 2025 protect pre-April-2025 income and gains if you were a remittance-basis user under the old regime. New post-April-2025 foreign income is on the arising basis, with the FIG election still open if you qualify.
• Always UK resident. If you are UK-domiciled and have always lived here, you were always on the arising basis, FIG does not touch you, and FTC applies to any foreign rental exactly as before.

So if you have always been UK resident, FIG changes nothing. If you are a recent arriver, it can defer the credit question by up to 4 years while the window absorbs the rental entirely. And if you were a non-dom caught by the April 2025 reform, the transitional rules can make a real difference to your position.

Worked example: Helen UK-resident with a Lisbon flat

Helen, 47, UK-domiciled and UK-resident throughout, lives in Reading. UK marketing director on £95,000 salary (higher-rate taxpayer). Inherited a one-bedroom flat in Lisbon (Bairro Alto, walking distance to tourist core) from her aunt in 2022; the flat is mortgage-free, valued at €380,000.

Helen lets the flat through a short-stay platform during high season (May to October) and reserves it for personal use the rest of the year. 2025/26 figures:

Portuguese position.

• Gross rental: €18,000 (180 nights at €100 average net of platform commission).
• Portuguese deductible expenses (utilities, cleaning, agent fees, IMI municipal tax, condominium fees): €4,500.
• Portuguese net rental: €13,500.
• Portuguese non-resident landlord IRS rate: 25% flat.
• Portuguese tax: €13,500 × 25% = €3,375.
• Helen pays the €3,375 to Autoridade Tributária through her Portuguese fiscal representative.

UK position (UK measure of the same rental).

• Gross rental converted at 2025/26 average rate (£1 = €1.18): €18,000 ÷ 1.18 = £15,254.
• UK-rule expenses (same items, GBP-converted): €4,500 ÷ 1.18 = £3,814.
• No mortgage on the property (Helen inherited free of mortgage), so s.24 has no effect.
• UK-measure net rental: £15,254 - £3,814 = £11,440.
• Helen's UK marginal rate (higher-rate, 40% on rental above the basic-rate band): £11,440 × 40% = £4,576. This is the UK tax cap on the same item of income.

FTC calculation under TIOPA s.18.

• Foreign tax paid (GBP-converted): €3,375 ÷ 1.18 = £2,860.
• UK tax cap on UK measure: £4,576.
• Lesser of foreign tax and UK cap: £2,860.
• Credit allowed: £2,860.
• UK net liability on the rental: £4,576 - £2,860 = £1,716.

SA106 entries.

• Box 14 to 17: foreign rental €18,000 = £15,254.
• Box 18 to 22: UK-eligible expenses £3,814.
• Box 23: no finance costs (no mortgage).
• Box 24: foreign tax £2,860.
• Box 25: credit election (default).

Helen's overall 2025/26 UK tax on the rental: £1,716 (£4,576 gross UK liability minus £2,860 credit). Plus £2,860 already paid in Portugal. Total tax on the €13,500 net rental (£11,440 UK measure): £4,576 (£1,716 UK + £2,860 Portuguese). Effective tax rate on the rental: 40% (Helen's UK marginal rate). The credit has eliminated the double taxation; the UK has absorbed all the rental into its system at Helen's UK marginal rate.

Counterfactual: if Helen had a mortgage. Suppose Helen had a £200,000 buy-to-let mortgage on the Lisbon flat at 5% (€236 per month, £200 per month after currency conversion). Annual interest: £2,400. Under s.24 ITA 2007, the £2,400 is restricted to a basic-rate (20%) tax reducer of £480 against Helen's UK tax bill. The UK-measure rental remains £11,440 (interest is NOT a deduction against the UK measure for s.24 purposes); UK tax on the rental is still £4,576 gross, minus £480 finance-cost reducer, minus £2,860 FTC credit = £1,236 net UK liability. The mortgage reduces Helen's economic return but only marginally reduces her UK tax bill because s.24 caps the relief at basic rate. Portuguese tax position is unchanged because Portugal allows full interest deduction (different foreign-measure produces a lower €13,500 - €2,832 = €10,668 net, IRS at 25% = €2,667 = £2,260). FTC then drops to £2,260 (the new lower foreign tax), and the UK net liability rises to £1,836. Net cost of having a mortgage on the Portuguese flat: £600 a year of extra UK-side cost on top of the £2,400 of interest. If you carry a mortgage on an overseas property, this is exactly the s.24 / FTC interaction that is easy to under-model.

Deduction instead of credit: when it works

Instead of a credit, TIOPA 2010 s.27 lets you elect to deduct the foreign tax from the foreign income. The deduction route takes the foreign tax off the UK-measure rental; the credit route takes it off the UK tax bill. The credit usually wins, but not always, so it is worth knowing when the other route pays.

On Helen's figures:

• Credit route: UK tax on £11,440 = £4,576; less credit £2,860; net UK = £1,716. Combined tax: £4,576.
• Deduction route: UK measure £11,440 - foreign tax £2,860 = adjusted UK measure £8,580. UK tax at 40% = £3,432. Combined tax: £3,432 (UK) + £2,860 (Portuguese already paid) = £6,292.

Credit is £1,716 better than deduction in Helen's case. The deduction route is preferable only where:

• UK tax on the doubly-taxed item is zero or negative. If Helen had UK losses elsewhere that wiped out UK tax on the rental, the credit would be zero (cap of nil) and deduction would at least reduce the loss.
• The foreign tax exceeds the UK tax cap materially. Where the foreign rate is high and the UK measure is low (e.g. Portuguese non-resident IRS at 25% applied to a rental that gives only a small UK tax bill after expenses and s.24), the lost-credit excess can be substantial; deduction may give better aggregate relief.

If you are a higher-rate landlord with positive UK tax on the rental, credit beats deduction. Either way, model the election rather than assume it.

Common traps for UK-resident landlords with overseas property

Five mistakes catch out UK-resident landlords with overseas property more than any others:

1. Treating the foreign measure as the UK measure. Foreign expense rules are usually more generous (Portugal's 25% non-resident deduction, France's micro-foncier 30%, Spain's deductible-actual regime). Your UK measure uses UK rules and tends to be higher than the foreign measure, and the credit cap is on the UK measure, not the foreign one.

2. Forgetting s.24 on overseas residential property. Section 24 ITA 2007 applies to overseas residential rental you own in your own name, not just to UK rental. Mortgage interest is restricted to a basic-rate tax reducer, so your UK measure is the gross-less-non-finance-expenses figure, which can sit well above the foreign-rule net figure.

3. Missing the FIG election window. If you are a qualifying new UK resident, the 4-year FIG window can keep foreign rental out of UK tax entirely. The election is annual, and miss the deadline and you lose the UK tax it would have covered for that year.

4. Not running the credit cap per item. Each overseas property is a separate item of income with its own cap. With a portfolio across several countries (Lisbon + Madrid + Paris, say), you run three separate cap calculations, not one in aggregate.

5. Failing to invoke the treaty-reduced rate at foreign withholding. Where the bilateral treaty cuts the foreign withholding rate below the domestic rate (rare for rental, real for some structures), you have to tell the foreign withholding agent to apply the treaty rate. Otherwise you pay at the domestic rate, the excess over the treaty-reduced rate is not creditable in the UK, and you recover it from the foreign authority rather than through UK FTC.

What to do next

Rent from an overseas property is double-taxable by design, and the UK's foreign tax credit framework is what cancels the overlap. The mechanics are TIOPA 2010 Part 2 (s.18 treaty credit or s.9 unilateral credit), the limit is the lesser of foreign tax and UK tax on the UK measure (s.36, ss.40-42), and you claim it on SA106 with HS304 behind it. The work itself:

• Confirm UK residence first. SRT under FA 2013 Sch 45. Split-year apportionment under Part 3 if relevant.
• Check FIG eligibility if a new arriver. From 6 April 2025, the 4-year FIG window may exclude foreign rental entirely; election is annual and must be made on SA109 / SA106.
• Compute the UK measure under UK rules. Apply s.24 to mortgage interest on residential overseas property. Capital allowances on qualifying plant. UK-eligible letting expenses only.
• Cap the credit at the lesser of foreign tax and UK tax on the UK measure. Per item of income. Excess foreign tax is generally lost; carry-forward is narrow.
• Choose credit over deduction unless UK tax is exhausted by other relief. Model both routes annually.
• Record the foreign tax paid in GBP using HMRC monthly exchange rates or annual averages.
• File SA106 with foreign rental and FTC alongside SA105 for any UK rental, SA108 for any disposals, and SA100 for the master return.

If your property is in a specific country, our worked country guides apply this framework to the situation on the ground: read the UK-France DTA guide, the UK-Spain DTA guide for a Spanish holiday home, or the UK-Italy DTA guide. Everything starts with residence, so if yours is at all in doubt, work through the SRT landlord decision tree and, where two countries both claim you, the Article 4 tie-breaker. For the bigger picture across all your treaties, see the UK tax treaties framework guide; if you let in the UK too, the landlord self-assessment filing guide covers the SA105 side that sits next to SA106.

FTC has only a few moving parts: the UK measure, the cap, the source rule, the six principles. Get them in the right order and document the per-item arithmetic, and the credit lands where it should. Most claims that fail or under-claim do so by skipping the UK-measure step or treating a portfolio as one lump. If your overseas property is mortgaged, or you hold rentals in more than one country, that is where it pays to have someone run the numbers with you before you file.