How is Stamp Duty Calculated?
A step-by-step guide to understanding how stamp duty works.
Key Takeaways
- SDLT uses progressive bands like income tax: only the portion of price in each band is taxed at that rate, never the whole amount
- Crossing a band threshold never causes a sudden jump in total tax; £1 extra only adds tax on that £1, not the full price
- The effective rate is always lower than your highest band rate because lower portions are taxed less (e.g., 2.5% on £400k vs 5% top band)
- Surcharges stack on top of base rates in every band: non-UK residents buying second homes pay base + 5% additional + 2% non-resident in each slice
- Scotland's nil-rate band is £145,000 (vs England's £125,000), saving £400 on identical properties below this threshold
- Wales uses separate band structures for additional properties rather than flat surcharges; higher rate bands differ significantly from standard
- First-time buyers pay 0% on the first £300,000 (vs standard 0%/2%/5% across three bands), saving £6,250 on a £300k property
- Corporate buyers pay 17% on amounts over £500k (changed from 15% in 2024), adding £20,000 on a £1m purchase compared to pre-2024 rates
In this article
The Key Concept: Tiered Rates
Stamp duty uses a tiered (or marginal) system, similar to income tax. You don't pay a single rate on the whole property price. Instead, different portions of the price are taxed at different rates. This is why the effective rate is always lower than the highest band rate.
The Stamp Duty Bands (England & NI)
As of January 2026, these are the standard SDLT rates for residential properties. Use our stamp duty calculator to calculate your exact liability:
| Band | Rate |
|---|---|
| £0 - £125,000 | 0% |
| £125,001 - £250,000 | 2% |
| £250,001 - £925,000 | 5% |
| £925,001 - £1,500,000 | 10% |
| Over £1,500,000 | 12% |
Progressive Band System Explained
Stamp duty works like income tax: it uses a progressive (or marginal) rate system. This means different portions of the property price are taxed at different rates, not the entire price at one single rate.
Think of it Like a Layered Cake
Imagine the purchase price as a layered cake:
- •The bottom layer (£0-£125k) is tax-free
- •The second layer (£125k-£250k) is taxed at 2%
- •The third layer (£250k-£925k) is taxed at 5%
- •And so on for higher bands
You only pay the higher rate on the portion of the price within that band, not on the whole price.
This is why crossing into a new band doesn't suddenly make your entire stamp duty bill jump. Only the amount above the threshold is taxed at the higher rate.
Step-by-Step Calculation
Let's work through an example for a £400,000 property purchase:
Example: £400,000 Property
Common Misconception: Flat Rate vs Progressive
Many people mistakenly think that if their property price crosses into a new band, they pay that band's rate on the entire purchase price. This is not how it works.
The Myth
Incorrect thinking: "If I buy at £250,001, I pay 5% on the entire amount (£12,500.05)."
Reality: You pay 0% on the first £125,000, 2% on the next £125,000, and 5% only on the remaining £1. Total: £0 + £2,500 + £0.05 = £2,500.05
This progressive system means there is never a "cliff edge" where paying £1 more suddenly costs you thousands in extra tax. You always pay proportionately more as the price increases, not dramatically more.
| Property Price | If Flat Rate (Wrong) | Actual Progressive (Correct) |
|---|---|---|
| £250,000 | £12,500 (5% of all) | £2,500 |
| £250,001 | £12,500.05 | £2,500.05 |
| £300,000 | £15,000 | £5,000 |
Understanding Effective Rate
The effective rate is the total tax divided by the property price. It's always lower than the highest band rate because lower portions of the price are taxed at lower rates.
In the example above, even though part of the price falls in the 5% band, the effective rate is only 2.5% because the first £125,000 is tax-free and the next £125,000 is only taxed at 2%.
How Higher Rates Stack
If you are subject to additional charges (additional property surcharge or non-resident surcharge), these stack on top of the base rates in each band.
Example: Non-UK Resident Buying Second Home
A non-UK resident buying a £400,000 buy-to-let property pays:
- Base rate: 0%
- + Additional property surcharge: 5%
- + Non-resident surcharge: 2%
- Combined: 7% = £8,750
- Base rate: 2%
- + Additional property surcharge: 5%
- + Non-resident surcharge: 2%
- Combined: 9% = £11,250
- Base rate: 5%
- + Additional property surcharge: 5%
- + Non-resident surcharge: 2%
- Combined: 12% = £18,000
These surcharges apply to each band individually, which is why the effective cost can be very high for certain buyer types.
Calculation for First-Time Buyers
First-time buyer rates differ from standard rates for properties up to £500,000:
| Band | FTB Rate | Standard Rate |
|---|---|---|
| £0 - £300,000 | 0% | 0% (£0-£125k), 2% (£125k-£250k), 5% (£250k-£300k) |
| £300,001 - £500,000 | 5% | 5% |
| Over £500,000 | No relief | Standard bands apply |
FTB Example: £400,000 Purchase
Additional Calculations
Additional Property Surcharge
For second homes and buy-to-let properties, add 5% to each band:
- £0 - £125,000: 5% (instead of 0%)
- £125,001 - £250,000: 7% (instead of 2%)
- £250,001 - £925,000: 10% (instead of 5%)
- £925,001 - £1,500,000: 15% (instead of 10%)
- Over £1,500,000: 17% (instead of 12%)
Non-Resident Surcharge
Non-UK residents pay an additional 2% on top of all other rates. This stacks with the additional property surcharge if applicable, meaning non-residents buying second homes pay base rate + 5% + 2% in each band.
Scotland and Wales: Different Calculations
Scotland (LBTT) and Wales (LTT) have their own tax systems with different bands and thresholds. The calculation method is the same (tiered rates), but the specific rates and thresholds differ significantly. See the full 2026 stamp duty rate tables for complete details.
Scotland LBTT Bands
| Band | Rate |
|---|---|
| £0 - £145,000 | 0% |
| £145,001 - £250,000 | 2% |
| £250,001 - £325,000 | 5% |
| £325,001 - £750,000 | 10% |
| Over £750,000 | 12% |
Scotland's Additional Dwelling Supplement (ADS) is 8% (increased from 6% in December 2024) and applies as a flat surcharge on top of each band, similar to England's additional property surcharge.
Wales LTT Bands
| Band | Standard Rate | Higher Rate |
|---|---|---|
| £0 - £225,000 | 0% | 4% |
| £225,001 - £400,000 | 6% | 7.5% |
| £400,001 - £750,000 | 7.5% | 9% |
| £750,001 - £1,500,000 | 10% | 11.5% |
| Over £1,500,000 | 12% | 16% |
Unlike England and Scotland, Wales uses completely separate band structures for additional properties rather than adding a flat surcharge. The higher rates are significantly different from standard rates in each band. You can compare England and Scotland rates to see the differences.
Quick Reference
- Scotland nil-rate: £145,000 (£175,000 for FTB)
- Wales nil-rate: £225,000 (no FTB relief)
- Scotland ADS: 8% flat surcharge
- Wales higher rates: Separate band structure (not a flat surcharge)
Common Mistakes
- Applying one rate to the whole price: Remember, only the portion within each band is taxed at that rate
- Forgetting the surcharge: Additional properties always pay the 5% surcharge in England/NI
- FTB threshold confusion: Properties over £500,000 don't get any FTB relief at all
- Wrong region: Scotland and Wales have completely different rates and bands
- Ignoring non-resident surcharge: Non-UK residents pay an extra 2% on top of everything else
- Confusing effective and marginal rates: The highest band rate is not your total tax rate
Frequently Asked Questions About Stamp Duty Calculations
Is stamp duty calculated on the full price?
Yes, stamp duty is calculated on the full purchase price, but not at a single rate. Different portions of the price are taxed at different rates using a progressive band system. For example, on a £400,000 property, the first £125,000 is taxed at 0%, the next £125,000 at 2%, and the remaining £150,000 at 5%. The total is £10,000, which is 2.5% of the full price (the effective rate), even though the highest band rate used was 5%.
How do stamp duty bands work?
Stamp duty bands work like income tax bands. Each portion of the purchase price within a specific range (band) is taxed at that band's rate. The first £125,000 is tax-free (0%), the next £125,000 is taxed at 2%, the next £675,000 at 5%, and so on. You only pay the higher rate on the portion of the price that falls within that band, not on the whole price. This is why crossing into a new band doesn't cause a sudden jump in your total bill; it increases proportionately.
Why is stamp duty so high?
Stamp duty can seem high because property prices in the UK are high, especially in areas like London and the South East. Additionally, the April 2025 threshold reductions mean more of the purchase price is now taxable. For investment properties, the 5% additional property surcharge significantly increases the bill. For example, a £500,000 buy-to-let property costs £32,500 in stamp duty, more than double the £15,000 a homeowner would pay. Non-UK residents pay even more due to the 2% surcharge. The government uses stamp duty as a significant revenue source, raising billions annually.
Can I reduce my stamp duty bill?
Limited options exist to legally reduce stamp duty. First-time buyers should ensure they claim relief if eligible (properties up to £500,000). If buying a property with fixtures and fittings, you can agree a separate price for these items (furniture, carpets, curtains) which is not subject to stamp duty, but this must be genuine and documented. If buying multiple properties, purchasing them in separate transactions might reduce the total, though this depends on timing and circumstances. Some buyers consider purchasing through a company, but this rarely saves on stamp duty alone and has other tax implications. Avoid tax avoidance schemes; HMRC actively challenges these.
Does stamp duty apply to the deposit or full price?
Stamp duty is calculated on the full purchase price of the property, not just the deposit or the amount you are borrowing via a mortgage. For example, if you buy a £300,000 property with a £30,000 deposit and a £270,000 mortgage, stamp duty is calculated on the full £300,000. This catches many first-time buyers by surprise, as they need to budget for stamp duty on top of their deposit and other fees. Stamp duty must be paid within 14 days of completion, so ensure you have the full amount available in addition to your deposit.
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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 Stamp Duty Calculator to help buyers understand the complex world of property transaction taxes.