Decision one
Is the tax still manageable once the price is agreed?
Purchase tax is easy to underweight because it is not part of the mortgage. It still has to be funded alongside deposit, fees and moving costs.
Property guides
Stamp Duty Calculator
Use this stamp duty calculator to estimate the tax due on a residential purchase in England and Northern Ireland, Scotland or Wales. It is built for a planning question rather than a legal one: if you buy at this price, which tax system applies, how much is likely to be due, and how much of the total purchase cost does that add in practice?
What matters most
- The tax is charged in bands, so the headline rate does not apply to the whole purchase price.
- Region, buyer type and surcharges can change the result far more than buyers expect near common thresholds.
- The useful decision is not just the tax due, but whether the all-in cash needed still fits the purchase plan.
Decision two
Are you close to a threshold that changes the bill?
Small price moves can change how much of the purchase falls into higher bands, especially once surcharges or relief rules are involved.
Decision three
Are buyer type and region changing the picture more than expected?
A first-time buyer, a home mover and an additional property buyer can face very different tax outcomes at the same price.
Before you calculate
Use this page to test the true cash requirement, not just the tax headline
A stamp duty estimate is most useful before an offer is final, when you still have room to test different prices, buyer types and regions. The point is not to admire one tax figure. It is to see whether the total purchase cost still works once the tax is added to everything else you need to fund.
This page does not replace conveyancing advice or specialist tax advice. Leasehold rent, companies, linked transactions, multiple dwellings and certain reliefs can change the final amount. What it does well is show the likely direction of the bill and make the band structure easier to see.
Calculator
Model the tax before you commit
Keep the inputs practical. Start with the likely purchase price, choose the nation that applies, then test whether buyer type or surcharge status materially changes the cost. The strongest use of this tool is comparison rather than confirmation.
Calculator
Enter the property details and select Calculate to view the estimated tax and band-by-band breakdown.
Results
Your estimated tax summary appears here after calculation.
Estimated total
—
Calculate to see the likely purchase tax for this scenario.
Purchase total
—
Property price—
Tax due—
This estimate applies — rules to a — purchase. Any surcharge position is shown as —. Use the band table below to see where the bill is actually being created rather than treating it as one flat rate across the whole price.
Band breakdown
| Band | Rate | Taxable amount | Tax |
|---|
This is a simplified SDLT estimate. Complex cases are not included.
Interpret the result
How to use this result in a real purchase decision
The tax figure matters, but the more useful reading is whether the all-in cash requirement still feels sensible once it sits next to deposit, legal fees, survey costs and moving expenses. A purchase can look affordable on mortgage terms alone and still become awkward once the tax is added back in.
This result is most useful when you compare nearby scenarios rather than staring at one number. A modest change in price, buyer type or surcharge position can alter the bill more than expected, especially if you are near a threshold. The useful question is not just “how much tax is it?” but “does this tax meaningfully change what I can buy without stretching?”
It also helps to separate the legal answer from the budgeting answer. Your conveyancer still determines the final treatment, but your own decision comes earlier: whether the total cash outlay still supports the purchase plan.
When the result can mislead you
- When you assume the top band rate applies to the whole purchase price
- When first-time buyer status or additional property status is guessed rather than checked
- When the tax is treated separately from deposit and fees instead of as part of the upfront funding need
- When a special case could apply but the estimate is treated like a formal conveyancing calculation
Compare next
Change the inputs that actually shift the bill
The next scenario should answer a decision, not just produce another tax number. If the total cost feels high, test a slightly lower purchase price first. If you are close to a threshold, compare both sides of it. If the buyer type is driving the result, check whether the surcharge or relief assumption is really secure before you rely on the lower figure.
Price now or price after negotiation?
A small negotiated reduction does not just save purchase price. It can also keep more of the transaction in lower bands.
First-time buyer relief or standard rates?
If relief is uncertain, test the standard outcome as well. A budget that only works with the best tax treatment is a weaker plan.
Main residence or additional property?
Additional property surcharges can change the bill sharply. Confirming that status early often matters more than obsessing over minor price changes.
What this page cannot tell you
It does not replace conveyancing advice, tax advice or a review of special transaction rules. Leasehold rent, companies, linked transactions, multiple dwellings and certain reliefs can all change the final position. Use it to pressure-test the purchase budget, not to replace the legal completion figure.
Best way to use the result
Keep one realistic scenario and one tougher one. If the tougher version still leaves enough room for deposit, fees and contingency, the purchase budget is much more believable.
FAQ
Stamp duty calculator questions
Why is the tax not one flat percentage of the purchase price?
Residential purchase taxes use bands. Different slices of the price are taxed at different rates, which is why the effective rate is usually lower than the top marginal rate reached.
Does first-time buyer relief apply everywhere in the UK?
No. Relief rules differ by nation. This tool reflects the broad residential rules, but you should still confirm eligibility for your exact case before relying on the lower outcome.
What counts as an additional property?
It generally means you are buying another residential property rather than replacing your main residence. Surcharge rules can be nuanced, so treat the result as a planning estimate and verify the final position with your conveyancer.
Does this include every special case?
No. It does not model companies, linked transactions, leasehold rent calculations, multiple dwellings relief or every exception. It is designed to cover the common residential scenarios cleanly.
Why compare the total purchase cost, not just the tax?
The tax matters because it changes the upfront cash requirement. A purchase can still be the wrong fit if the total needed at completion is too high, even when the mortgage itself looks fine.
Should I still ask my conveyancer to confirm the final amount?
Yes. This calculator is for planning and comparison. Your conveyancer should confirm the final treatment before completion because transaction details can change the legal answer.
Last updated: