SDLT residency test vs Statutory Residence Test (UK 2026)
The UK has two completely different tests for whether you are "UK resident". One decides whether you pay income tax here. The other decides whether you pay an extra 2% Stamp Duty when you buy a home. They use different rules, different time windows, and different consequences — and they regularly give opposite answers for the same person.
Conflating the two is one of the most common buyer mistakes flagged in HMRC's Stamp Duty Land Tax manual. This guide walks through what each test actually does, the four scenarios where they diverge, and the legal references you can cite to a conveyancer.
The headline difference
The Statutory Residence Test (SRT) — Finance Act 2013, Schedule 45 — decides whether you are UK-resident for income tax and capital gains tax in a given tax year. It is multi-stage, weighs five "UK ties", and runs over a tax year (6 April to 5 April).
The SDLT residency test — Finance Act 2003, Schedule 9A, inserted by Finance Act 2021 section 88 — decides whether you pay a 2% surcharge on top of standard SDLT when buying residential property in England or Northern Ireland. It is a single counted-days test over a rolling 12-month window. There are no "ties" and no tax-year alignment.
The two tests share no statutory mechanism. A buyer can pass one and fail the other in the same calendar week.
What the SDLT residency test actually requires
To be UK resident for SDLT purposes on completion, the buyer must have been present in the UK on at least 183 days during any continuous 12-month period falling within the 24 months ending on the effective date of the transaction (HMRC SDLTM09850).
The effective date is normally completion, not exchange.
Practical consequences:
- The test looks backwards from completion. Days in the 12 months after completion can also rescue a buyer — if a continuous 12-month window inside that 24-month frame hits 183 days, a refund of the 2% surcharge can be claimed (within 2 years of the effective date, HMRC SDLTM09875).
- "Present in the UK" means present at the end of the day (midnight rule), with the same transit and exceptional-circumstances exceptions used in the SRT.
- Joint purchasers: if any one buyer fails the test, the surcharge applies to the whole transaction (HMRC SDLTM09820). Marriage and civil partnership add their own aggregation rules.
- The surcharge applies regardless of whether the property will be a main residence, a second home, or a buy-to-let.
That is it. There is no "ties test", no "automatic" tests, no split-year carve-out. It is a 183-day count over a rolling window.
What the Statutory Residence Test actually requires
The SRT is a three-stage cascade applied to a UK tax year:
- Automatic overseas tests (FA 2013 Sch 45 Pt 1 paras 12-16). If any is met, the individual is non-resident for the year. Examples: fewer than 16 days in the UK if previously resident; fewer than 46 days if not previously resident; full-time work overseas with fewer than 91 UK days and fewer than 31 working days in the UK.
- Automatic UK tests (paras 6-9). If any is met, the individual is resident. Examples: 183 days or more in the UK in the tax year; a UK home where the person is present for at least 30 days and no overseas home of equivalent use; full-time work in the UK over a 365-day window.
- Sufficient ties test (paras 17-20). Days in the UK are matched against the number of UK ties (family, accommodation, work, 90-day, country). The day thresholds differ depending on whether the person was UK-resident in any of the three preceding tax years (an "arriver" or "leaver").
The SRT therefore produces a single yes/no answer per tax year, drawing on six months of data and up to five distinct ties. HMRC's RDR3 guidance runs to roughly 100 pages.
The four divergence cases
The two tests routinely disagree. The four most common combinations buyers hit in practice:
| Case | SRT result | SDLT result | What happens at completion |
|---|---|---|---|
| Long-term UK resident relocating abroad, returns to buy | Non-resident for the current tax year | Non-resident under the 183-day rolling test | 2% surcharge payable; refund possible if 183 UK days are reached in the 12 months after completion |
| New arrival, fewer than 183 UK days at completion | Resident (e.g. automatic UK test via UK home) | Non-resident | 2% surcharge payable on completion; refund possible after 183 UK days are reached |
| Long-term UK resident, brief 7-month posting abroad spanning completion | Likely resident (depending on ties) | Resident — still has 183+ days in the trailing 12 months | No 2% surcharge |
| Habitual non-resident inheriting and buying through UK structure | Resident or non-resident depending on ties | Non-resident | 2% surcharge payable; usually no refund pathway because the 183-day pattern is unlikely to materialise |
These outcomes are unintuitive precisely because the income-tax answer carries no weight in the SDLT calculation, and vice versa.
A worked example: the SDLT cost of getting it wrong
Take a buyer completing on a £400,000 home in England in 2026. The standard SDLT bill, based on the current slabs, is:
| Slab | Rate | Tax on band |
|---|---|---|
| £0–£125,000 | 0% | £0 |
| £125,001–£250,000 | 2% | £2,500 |
| £250,001–£400,000 | 5% | £7,500 |
| Total standard SDLT | £10,000 |
Source: HMRC SDLT residential rates, current at 18 May 2026; reproduced by Homecost's SDLT calculator.
If the buyer fails the SDLT residency test, the 2% surcharge applies on top of every slab, adding £8,000 (£400,000 × 2%). The bill rises from £10,000 to £18,000. At £750,000, the same surcharge takes the bill from £27,500 to £42,500. At £1 million, from £43,750 to £63,750.
Buyers who later qualify under the 12-month rolling window can reclaim the £8,000, but only if they file within 2 years of the effective date and supply travel records that withstand HMRC scrutiny. Reasons claims fail are catalogued in why SDLT surcharge refund claims fail.
Why prime central London tends to feel the divergence first
Land Registry transactions registered for 2025 show prime central London postcodes where the average sale price by itself triggers the highest SDLT slabs:
| Postcode | 2025 sales | Average price |
|---|---|---|
| W1K 6NP | 72 | £6,195,110 |
| SW1W 9JB | 108 | £3,192,017 |
| SW1X 9PP | 93 | £2,901,088 |
| SW7 2BH | 238 | £2,615,561 |
| W8 6AA | 292 | £2,433,282 |
| NW8 0LU | 291 | £2,390,031 |
| SW3 3JL | 327 | £2,373,479 |
Source: HM Land Registry Price Paid (registered transactions, sale dates 2025-01-01 to 2025-12-31), queried via Homecost on 18 May 2026.
At an average £2.4 million, the 2% surcharge alone is £48,000. The cumulative cost of misreading the SDLT residency test in these postcodes is large enough that conveyancers routinely advise an SRT-experienced tax adviser to sign off on a buyer's day-counts in writing before completion.
You can sanity-check the typical SDLT bill for any postcode using Homecost's lookup tool — try SW1A 1AA.
What to bring to a conveyancer
A conveyancer cannot give tax advice in the FCA / SRA sense, but they will ask for documentation that maps cleanly onto the SDLT residency test:
- A complete day-by-day calendar for the 24 months ending on the planned completion date. Air-travel itineraries, boarding-pass copies, and timestamped immigration entries are the strongest evidence.
- For joint purchasers, the same evidence for every named buyer plus any spouse or civil partner whose status aggregates under FA 2003 Sch 9A.
- A separate file recording any days that might qualify for the exceptional-circumstances rule (FA 2003 Sch 9A para 7) — for example, prolonged hospitalisation in the UK.
If completion is uncertain, the prudent default is to assume the surcharge applies, pay it on the SDLT1 return, and plan the refund route in parallel. This is detailed in the non-resident SDLT refund process.
Crossing into Scotland or Wales changes the picture entirely: LBTT and LTT have their own additional dwelling supplements but no comparable non-resident surcharge as of May 2026. See SDLT vs LBTT vs LTT compared for the cross-regime detail.
The bottom line
The Statutory Residence Test and the SDLT residency test are not two versions of the same idea. They look at different periods, use different mechanisms, and produce independent answers. A new arrival who is income-tax-resident from day one of their UK home can still owe £8,000–£60,000 of additional SDLT because they have not yet accumulated 183 days in any 12-month window ending at completion. A long-resident expat who has spent the past nine months abroad can still escape the surcharge because the trailing window picks up earlier UK presence.
Anyone close to either threshold should document day-counts contemporaneously, in the form HMRC will accept, and have the SDLT analysis signed off in writing before exchange — not after.
This is general information about how the SDLT residency test and the Statutory Residence Test work. It is not tax, mortgage or legal advice. Speak to a qualified adviser before acting.
Based on 30.98 million HM Land Registry transactions and current HMRC SDLT slabs as published at 18 May 2026. See more Cost Intelligence guides.