Additional Property SDLT Calculator 2026 (HRAD)

Reviewed by Mustafa Bilgic
UK Calculator Editor · Updated May 2026

HRAD scope: which transactions are caught

The Higher Rates for Additional Dwellings apply whenever, at the end of the day of completion, the buyer owns two or more major interests in residential dwellings — anywhere in the world, not just the UK. The dwelling test is by value: each property must exceed £40,000 to count.

Common situations that trigger HRAD: buying a buy-to-let, buying a second home, buying a holiday cottage, buying a child a flat (in your name), inheriting a property and then buying another, owning a flat abroad and buying in the UK.

How to reclaim the HRAD surcharge

If you bought before selling your previous main residence (so the new home triggered the surcharge as an additional dwelling), you can reclaim the 5% surcharge if your old main residence sells within 36 months of the new purchase.

Apply to HMRC online within 12 months of the disposal of the old home, or within 12 months of the SDLT filing deadline of the new purchase, whichever is later. Approximately £6 billion of reclaims have been made since the original 3% surcharge was introduced in April 2016.

Pure BTL £250,000 — no reclaim possible

Standard SDLT: £0. HRAD: £12,500. Total £12,500. No previous-residence reclaim because the BTL doesn't replace a main home. Permanent cost of investment.

Bridging purchase £600,000 (sells old £450k home in 18 months)

Standard SDLT: £17,500. HRAD: £30,000. Total today: £47,500. After reclaim: £17,500. Refund of £30,000 within 12 months of selling old home.

Inherited flat then buying main home £400,000

Inherited 3 months earlier disqualifies main-home replacement test. Standard: £7,500. HRAD: £20,000. Total: £27,500. No reclaim because you didn't sell a main residence."

Common mistakes to avoid

• Believing 'I sold my home but my partner still owns one' avoids the surcharge — joint test catches both.
• Missing the 36-month sale window — even one day late means no reclaim.
• Not applying for the reclaim within 12 months of the old-home sale.
• Treating mixed-use commercial properties as residential — non-residential SDLT applies and HRAD does not.
• Forgetting to disclose foreign property holdings in the SDLT return — penalties for omission.

When to use this calculator

Run before any second purchase, especially in chain situations. Helps decide whether to bridge or wait. Couples should run twice — once each — to identify if buying solely under one spouse's name avoids HRAD.

How this differs in Scotland, Wales and Northern Ireland

England and NI use HRAD at 5%. Scotland's LBTT Additional Dwelling Supplement is 8% from December 2024 (raised from 6%). Wales's LTT surcharge is 5%. Each devolved nation has its own reclaim rules but the 36-month framework is similar.

When this calculator is and isn't the right tool

The Additional Property SDLT Calculator 2026 (HRAD) 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

• 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.
• Second Home SDLT 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.
• Non-UK Resident 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.
• 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.
• Residential SDLT 2025/26 — 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.