Residential SDLT Calculator UK 2025/26

Reviewed by Mustafa Bilgic
UK Calculator Editor · Updated May 2026

Standard residential SDLT structure for owner-occupiers

Stamp Duty Land Tax for owner-occupier residential purchases in England and Northern Ireland in 2025/26 has four bands: 0% on the first £250,000, 5% on the next £675,000 (taking you to £925,000), 10% on the next £575,000 (to £1.5m), then 12% on everything above £1.5m. The threshold of £250,000 was made permanent by the March 2025 Spring Statement.

SDLT is calculated on a sliced basis — only the slice within each band is taxed at that rate, not the whole price. This is unlike older 'slab' regimes that taxed the whole price at the highest band reached.

Filing and payment process

Your conveyancer files form SDLT1 with HMRC within 14 days of completion. Penalties apply for late filing: £100 fixed plus interest on unpaid tax. Most conveyancers file via HMRC's online system and pay directly from completion funds.

If you under-declare the price, HMRC has 9 months to query the return and 21 years to investigate fraud. Honest mistakes are usually corrected without penalty.

£200,000 starter home

Below the £250k threshold. SDLT = £0. Effective rate 0.00%.

£350,000 suburban semi

0% × £250k + 5% × £100k = £5,000. Effective rate 1.43%.

£1,200,000 country house

0% × £250k + 5% × £675k + 10% × £275k = £61,250. Effective rate 5.10%.

Common mistakes to avoid

• Assuming the highest band rate applies to the whole price — sliced calculation differs.
• Missing the 14-day filing window — automatic penalty.
• Using residential bands for a mixed-use purchase — non-residential rates are lower.
• Forgetting the FTB relief if eligible — see the dedicated FTB calculator.
• Using £125,000 threshold from older guidance — the threshold was permanently raised to £250,000 in March 2025.

When to use this calculator

Standard residential calculator for owner-occupiers replacing a main residence or buying their first standard-priced home. For BTL, second home, FTB or non-resident scenarios, use the dedicated calculators.

How this differs in Scotland, Wales and Northern Ireland

Standard SDLT applies in England and NI. Welsh LTT bands: 0% on £0-£225k, 6% on £225k-£400k, 7.5% on £400k-£750k, 10% on £750k-£1.5m, 12% above. Scottish LBTT bands: 0% on £0-£145k, 2% on £145k-£250k, 5% on £250k-£325k, 10% on £325k-£750k, 12% above.

When this calculator is and isn't the right tool

The Residential SDLT Calculator UK 2025/26 above is built for the most common UK 2025/26 scenarios in this tax area. It will be the right tool when your situation maps cleanly onto the inputs — single property or simple aggregation, standard HMRC rates and bands, and individual taxpayer (rather than complex trust or partnership structures). It is informational and does not replace tailored advice from a chartered tax adviser, especially for transactions above £500,000, cross-border situations, or where reliefs interact with each other. For year-end filings, always reconcile with HMRC's own free calculators on gov.uk before pressing submit on Self Assessment.

Closely related calculators

• UK SDLT Rates 2026 — useful when you need a different angle on the same UK property tax topic, especially if your situation involves multiple types of property income or disposal.
• First-Time Buyer SDLT — useful when you need a different angle on the same UK property tax topic, especially if your situation involves multiple types of property income or disposal.
• Mortgage Stamp Duty — useful when you need a different angle on the same UK property tax topic, especially if your situation involves multiple types of property income or disposal.
• Property Purchase Cost — useful when you need a different angle on the same UK property tax topic, especially if your situation involves multiple types of property income or disposal.
• BTL SDLT — useful when you need a different angle on the same UK property tax topic, especially if your situation involves multiple types of property income or disposal.

Glossary of UK property tax terms

SDLT

Stamp Duty Land Tax — the UK government tax on residential property purchases in England and Northern Ireland.

HRAD

Higher Rates for Additional Dwellings — the formal name for the 5% surcharge on second homes and BTL purchases.

SDLT1

The HMRC return form filed within 14 days of completion to declare and pay SDLT.

Sliced bands

SDLT is charged on slices of the price within each band, not on the whole price at the highest band.

Effective rate

Total SDLT divided by the purchase price, expressed as a percentage.

Tax planning checklist

1. Confirm the figures input above match your actual position — purchase contract, mortgage offer or completion statement.
2. Cross-check the year (2025/26) — figures change every April. The tax year 2026/27 starts 6 April 2026.
3. Use HMRC's official calculator at gov.uk for the final filing figure; this calculator is informational.
4. Keep records for at least 6 years — HMRC's normal enquiry window. 21 years for fraud investigations.
5. Discuss any unusual transaction (joint purchase, gift, divorce settlement, trust) with a qualified tax adviser.
6. Submit your return online via Government Gateway — paper deadlines are earlier and penalties harsher.