Stamp Duty on a £450,000 Second Home in 2026: Full Worked Example

Standard SDLT Rates on a £450,000 Property

England and Northern Ireland's residential SDLT bands for 2026/27 are:

Applying these bands to a £450,000 purchase:

• £0 - £125,000: 0% = £0
• £125,000 - £250,000 (£125,000 taxable): 2% = £2,500
• £250,000 - £450,000 (£200,000 taxable): 5% = £10,000

Standard-rate SDLT total: £12,500

Adding the 5% Additional Property Surcharge

If the buyer already owns another residential property anywhere in the world at the point of completion — most commonly a buy-to-let purchase, second home or holiday home — a flat 5% surcharge applies to the entire purchase price, not just the amount above a threshold:

5% x £450,000 = £22,500

Total SDLT on a £450,000 second home: £12,500 + £22,500 = £30,000

This is a substantial cost — at this price point, the surcharge alone is nearly double the standard-rate bill, and the combined SDLT charge of £30,000 represents 6.7% of the purchase price before any legal fees, survey costs or mortgage arrangement fees are added.

Why the Surcharge Applies to the Whole Price, Not Just the Top Slice

Unlike the standard SDLT bands, which apply progressively (only the portion of the price within each band is taxed at that band's rate), the 5% additional property surcharge is a flat percentage of the entire purchase price. This is a common point of confusion — buyers sometimes assume the surcharge only applies to the amount above £250,000 or £925,000, but it applies from £1 of the purchase price if the property qualifies as an additional dwelling.

Reclaiming the Surcharge When Replacing a Main Residence

Not every additional-property purchase is a genuine second home. A common scenario is someone who completes on their new main residence before selling their previous home — perhaps to avoid a chain collapsing, or because timing didn't align. In this case:

• The surcharge is paid upfront, because at the point of completion the buyer technically owns two properties
• If the previous main residence is sold within 36 months of the new purchase, the 5% surcharge can be reclaimed from HMRC in full
• The reclaim must be made within 12 months of the sale of the previous home, or 12 months from the filing date of the SDLT return for the new purchase, whichever is later

This distinction matters for a £450,000 purchase: someone genuinely buying a second home or buy-to-let pays the full £30,000 with no prospect of a refund, while someone in a temporary two-property situation while moving house can recover the £22,500 surcharge once their old home sells.

Buy-to-Let Considerations Beyond SDLT

For landlords specifically, the £30,000 SDLT bill on a £450,000 buy-to-let purchase is a significant upfront cost that reduces the effective yield in the early years of ownership. It's worth factoring the full SDLT cost — not just the deposit and mortgage arrangement fee — into any rental yield calculation before committing to a purchase at this price point.