Second Home & Buy-to-Let Stamp Duty Calculator
Both second homes and buy-to-let purchases pay the same 5% surcharge. Calculate the full bill, and see when you can avoid the surcharge by selling your existing home first. Updated for January 2026.
Your Results
Stamp Duty to Pay
£20,000
Effective tax rate: 6.67%
Tax Breakdown
| Band | Rate | Tax |
|---|---|---|
| £0 - £125,000 | 5% | £6,250 |
| £125,001 - £250,000 | 7% | £8,750 |
| £250,001 - £300,000 | 10% | £5,000 |
| Additional Property | +5% | +£15,000 |
| Total | £20,000 | |
£0 - £125,000
5%
£6,250
£125,001 - £250,000
7%
£8,750
£250,001 - £300,000
10%
£5,000
Additional Property
+5%
+£15,000
Total
£20,000
Tax by Band
Added to 25-Year Mortgage
£117/month
Based on 5% interest rate, added to loan amount
Second Home vs Buy-to-Let: Same SDLT Either Way
Identical at the point of purchase
HMRC does not distinguish between a holiday home, a second home and a buy-to-let for SDLT. All three are "additional residential property" and all three attract the same 5% surcharge on top of standard rates. Whether you plan to live in it occasionally or rent it out makes no difference to the tax bill.
The only real difference: refunds
If the new property becomes your main residence and you sell your old main home within 36 months, you can reclaim the 5% surcharge. A buy-to-let kept as a rental cannot — the surcharge is permanent. Use this calculator either way; the SDLT figure is the same.
Understanding the 5% Surcharge
What is it?
Since April 2025, if you buy an additional property (second home, holiday home, or buy-to-let), you pay an extra 5% on top of the standard stamp duty rates. This applies to the entire purchase price.
When does it apply?
The surcharge applies when you already own another residential property anywhere in the world at the end of the day of purchase, and the new property costs £40,000 or more.
How Much Extra Will You Pay?
| Property Price | Standard SDLT | 5% Surcharge | Total to Pay |
|---|---|---|---|
| £200,000 | £1,500 | +£10,000 | £11,500 |
| £300,000 | £5,000 | +£15,000 | £20,000 |
| £500,000 | £15,000 | +£25,000 | £40,000 |
| £750,000 | £27,500 | +£37,500 | £65,000 |
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Selling Your Existing Home First Cuts the Bill
The 5% surcharge is triggered by property count at the end of the day of completion, not by what you intend to do with the new place. If your only existing residential property is sold before — or on the same day as — you complete the new purchase, you only own one property at completion, and the surcharge does not apply.
Worked example — £400,000 purchase:
- • Keep existing home, buy second/BTL: £30,000 SDLT (standard £10,000 + £20,000 surcharge)
- • Sell existing home, then buy: £10,000 SDLT (no surcharge, single property at completion)
- • Saving: £20,000
This applies to buy-to-let buyers too: if a landlord with one rental property sells that rental and then buys a different one, no surcharge is due (only one property owned at the end of completion day). Many investors and downsizers underestimate the savings from sequencing a sale before a purchase.
Timing matters: the test is run at the end of the day of completion. A sale that completes on the same day as the purchase counts. A sale that completes one day later does not — you would pay the surcharge upfront and have to reclaim it later (only available where the new property is your main residence). See the refund rules below.
Can You Get a Refund?
Yes, you may be entitled to a refund if:
- 1.You sell your previous main residence within 36 months of buying the new property
- 2.The new property becomes (or was intended to become) your main residence
How to claim: You must claim the refund within 12 months of selling your previous home (or within 12 months of the filing date for the original return, if later). See our complete stamp duty refund guide for full details.
Common Scenarios
Surcharge DOES apply if:
- •You're buying a holiday home while keeping your main residence
- •You're buying a buy-to-let investment property
- •You haven't sold your old home before completing on the new one
- •You own property abroad worth over £40,000
Surcharge does NOT apply if:
- •You're replacing your main residence (sold before purchase) - read our second home guide or our second home surcharge FAQ
- •Property is worth less than £40,000
- •You only own a share of another property (less than major interest)
- •You're buying a caravan, mobile home, or houseboat
What Counts as an Additional Property?
HMRC's definition is broad and intent-blind. Any residential property you purchase while already owning another residential property triggers the 5% surcharge — second home, buy-to-let, holiday home, or property held for renovation. This includes:
- •Holiday homes: A cottage in Cornwall, a flat in Edinburgh, or any property used for holidays while you retain your main residence
- •Buy-to-let investments: Properties purchased to rent out, regardless of whether they are your first rental property
- •Properties abroad: If you own residential property anywhere in the world (even if inherited), it counts as existing ownership
- •Properties held in trust: Beneficial interests in residential property held through trusts may also trigger the surcharge
Notable exceptions: caravans, mobile homes, and houseboats are not classified as dwellings for SDLT purposes. Properties valued under £40,000 are also exempt from the surcharge.
Buy-to-Let: Extra Considerations for Landlords
No refund on rentals
The 5% surcharge is permanent on a property kept as a buy-to-let. The refund mechanism only applies where the new home becomes your main residence. Build the SDLT into your acquisition cost when modelling yields with our rental yield calculator.
Limited company purchases
The 5% surcharge applies on company SPV purchases too. Properties over £500,000 bought by a corporate body attract a flat 17% rate in some circumstances. Compare with our limited company vs personal calculator.
Capital, not revenue, expense
Stamp duty paid on a BTL is added to your acquisition costs. It is not deductible against rental income, but it does reduce your capital gains tax liability when you eventually sell the property.
Non-UK resident landlords
If you are a non-UK resident, an additional 2% surcharge stacks on top of the 5% additional property rate, taking the total surcharge to 7%. See our non-resident calculator.
Replacement Main Residence Exemption
The most common way to avoid the surcharge permanently is through the replacement main residence exemption. If you sell your current main home before completing on the new one, the surcharge does not apply at all. However, property chains rarely align perfectly, so many buyers pay the surcharge upfront and then reclaim it.
If you buy your new main residence before selling the old one, you pay the 5% surcharge at completion but can apply for a full refund once you sell within 36 months. The refund claim must be made within 12 months of the sale of the previous property or within 12 months of the filing date for the SDLT return, whichever is later.
Common trap: If your sale falls through after you have already completed the purchase, the 36-month clock continues ticking from your purchase completion date. You must find another buyer and complete the sale within that period to qualify for the refund. It is not reset if a sale collapses.
Common Stamp Duty Traps for Second Home Buyers
Inherited Property
If you have inherited a share of a residential property worth more than £40,000, it counts as ownership of an additional dwelling. Buying a new property while holding this interest triggers the surcharge, even if you have never lived in the inherited property.
Separation and Divorce
If you still jointly own the matrimonial home and buy a new property, the surcharge applies. This can be a costly surprise for separating couples who have not yet completed a property settlement.
Gifted Properties
Properties gifted to you, including those transferred at nil value, count as ownership. If a family member has transferred a property into your name, this triggers the surcharge on any subsequent purchase.
Missed Refund Deadline
The 36-month window to sell your previous main residence and claim a refund is strictly enforced. A slow market, difficult tenants, or planning issues that delay the sale can result in permanently losing the refund.
Frequently Asked Questions
Is stamp duty different for a second home vs a buy-to-let?
No. SDLT is identical for second homes, holiday homes and buy-to-let purchases. All three are treated as additional residential property by HMRC and attract the same 5% surcharge on top of standard SDLT rates. The only difference is what happens after completion: a second home that becomes your main residence may qualify for a refund if you sell your old main home within 36 months, while a buy-to-let kept as a rental cannot reclaim the surcharge.
What is the second home and buy-to-let stamp duty surcharge?
Since 31 October 2024, buyers purchasing an additional residential property such as a second home, holiday home, or buy-to-let pay a 5% surcharge on top of standard SDLT rates. The previous surcharge was 3%. This applies to the entire purchase price of properties over £40,000.
Can I avoid the surcharge by selling my existing home first?
Yes. If you sell your only residential property before completing on the new one, the new property becomes your only home at the end of the day of purchase, so the 5% surcharge does not apply. This works whether the new property is a buy-to-let, second home, or replacement main residence — what matters for SDLT is property count at completion, not the intended use. If you are buying a buy-to-let and have nothing else, you pay standard SDLT.
Does the surcharge apply to my first buy-to-let?
Yes, if you already own your main home. The surcharge is triggered by owning more than one residential property at completion, not by it being your first investment. If you have no other property and buy a BTL, no surcharge applies.
When does the 5% surcharge apply?
The surcharge applies when you already own another residential property anywhere in the world at the end of the day of purchase and the new property costs more than £40,000. This includes inherited properties, properties abroad, and properties held in trust worth over £40,000.
Can I get a refund on the second home surcharge?
Only if the new property is replacing your main residence. You must sell your previous main home within 36 months of buying the new one, and the new property must become your main residence. The refund claim must be made within 12 months of the sale. Buy-to-let purchases kept as rentals cannot reclaim the surcharge — it is a permanent cost.
Can I deduct stamp duty as a landlord expense?
No. Stamp duty on a buy-to-let is a capital expense, not a revenue expense, so it cannot be deducted from rental income for income tax. However, it is added to your acquisition cost and reduces your capital gains tax liability when you eventually sell the property.
What counts as owning another property for the surcharge?
Any residential property worth over £40,000 counts, including properties abroad, inherited properties, and properties held in trust. Minor interests under £40,000 in value are excluded. Caravans, mobile homes, and houseboats are not classified as dwellings for SDLT purposes.
Reviewed by
Emma Richardson, MRICS
Chartered Surveyor & Property Tax Specialist
Emma Richardson is a RICS-qualified Chartered Surveyor with over 12 years of experience in UK property taxation. She founded Calculate My Stamp Duty UK to help buyers understand the complex world of property transaction taxes.