Property planning

Stamp Duty Calculator

Use this UK stamp duty calculator to estimate the property tax due before you make an offer or complete a purchase. Check SDLT in England and Northern Ireland, LBTT in Scotland or LTT in Wales, then compare how purchase price, buyer status and additional-property rules affect the cash needed at completion.

Written byCallum Dunn
Reviewed4 April 2026
Read Time6 Minutes

What matters most before you make an offer

  • Check the nation first, because England and Northern Ireland use SDLT, Scotland uses LBTT and Wales uses LTT.
  • Buyer status can change the result sharply, especially if you are purchasing an additional property or are not replacing your main home.
  • Treat the tax as part of the upfront cash requirement, not as a minor fee that can be dealt with after the mortgage is agreed.

Decision one

Does the offer price still work after tax?

The purchase price is not the same as the total cash needed to buy. Stamp duty is paid alongside other completion costs, so it needs to be checked before you decide whether a viewing price, offer price or revised negotiation point is realistic.

Run the figure at the price you hope to pay, then run it again at the highest price you might accept. This shows whether a small increase in the offer would merely be uncomfortable or whether it would push the whole transaction beyond your safe cash buffer.

Decision two

Are you using the right buyer status?

First-time buyer, home mover, additional property and non-resident rules can produce very different outcomes. The mistake is to use the most favourable status because it feels close enough, then discover later that the conveyancer has to apply a surcharge.

If your situation is not straightforward, use the calculator as a planning screen rather than the final legal answer. A couple keeping one property, a buyer purchasing before selling, or someone buying through a company may need specific advice before relying on the estimate.

Decision three

Should you change the budget or the timing?

If the tax bill absorbs the cash you planned to keep back for repairs, removals or emergency savings, the property may be more stretched than the mortgage payment suggests. The answer may be a lower offer, a longer saving period, or a different property band.

The calculator is most useful when it changes the decision before you commit. A tax estimate should help you decide whether to move ahead, renegotiate, delay, or compare a different location where the banding rules and thresholds may not produce the same result.

Before you calculate

Build the buying budget around completion cash, not only monthly affordability

Property affordability is often discussed as a monthly mortgage question, but purchase tax is an upfront cash question. That difference matters. A household can pass a mortgage affordability check and still find the move uncomfortable if stamp duty removes the cash that was meant to cover legal fees, moving costs, furniture, repairs or the first months in the new home.

Start by choosing the correct UK nation. A property in England or Northern Ireland is treated differently from one in Scotland or Wales. The names are similar enough to cause confusion, but the thresholds and rates are not identical. A buyer comparing properties near a border should not assume the same tax result will apply.

Then check buyer status carefully. First-time buyer relief can make a large difference, but it only helps when the rules are genuinely met. Additional-property surcharges can also apply in situations that feel temporary, such as buying before selling an existing home. That is why the safest planning approach is to run the calculation with the status your conveyancer is likely to use, not the status you hope will apply.

Finally, judge the result alongside your deposit and remaining cash. If the tax bill leaves you with no buffer, the transaction may be fragile even when the mortgage payment looks manageable. A more robust plan leaves enough cash after completion to handle immediate repairs, insurance, council tax, utilities, removals and a realistic emergency reserve.

Calculator

Estimate the property tax before setting your buying budget

Calculator

Enter the property details and select Calculate to view the estimated tax and band-by-band breakdown.

SDLT bands are used for England and Northern Ireland.
Use the agreed or likely purchase price.
England/NI supports first-time buyer relief within eligibility limits.
Available for England & Northern Ireland SDLT only.

Results

Your estimated tax summary appears here after calculation.

Estimated total
—

Calculate to see the likely purchase tax for this scenario.

Effective rate—
Total purchase cost—
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.

After you calculate

What your stamp duty result means

The result is the estimated residential property tax due for the price, region and buyer status entered. Read it as a completion-cost figure rather than a monthly affordability figure. It tells you how much extra cash the purchase may need before you can judge whether the deposit and mortgage plan are enough.

If the tax looks higher than expected, do not simply reduce your deposit buffer and carry on. Check whether the buyer status is correct, whether the property is in the right nation, and whether the price falls close to a threshold where a small negotiation change could alter the outcome. The useful question is whether the total upfront cost still leaves you with enough money after completion.

For example, a buyer who has saved a 10% deposit may feel prepared until a large tax bill, legal fees and moving costs are added. If the calculator shows that most spare cash disappears at completion, the stronger decision may be to negotiate harder, wait longer, or choose a property that leaves more room for repairs and normal living costs.

What changes the result fastest?

The main lever is the purchase price, but buyer status can be even more important if a surcharge or relief applies. Test the same property as a main residence and as an additional property if your circumstances are uncertain. Also test a lower offer to see whether the saving is meaningful enough to affect negotiation.

Common stamp duty mistakes

The first mistake is using the wrong national system. The second is assuming first-time buyer treatment applies without checking all owners involved in the purchase. The third is forgetting that an additional-property surcharge can apply even when the move feels temporary. The fourth is treating the estimate as the only moving cost, when legal fees, surveys and immediate property work can also be material.

What to do after the calculation

Save the scenario that matches your intended offer and ask your conveyancer to confirm the treatment before exchange. Then compare the all-in completion cost with your remaining cash buffer. A purchase that only works if nothing goes wrong is not as affordable as the mortgage payment alone may suggest.

Read how MyFinanceTools approaches calculator estimates.

Compare next

Use the tax estimate to adjust the buying plan

Once you know the likely tax bill, compare three versions of the purchase: the target offer, the maximum offer, and a lower negotiation point. The difference between those scenarios shows whether price movement changes the plan enough to matter.

Compare with the mortgage payment

A property can have an affordable monthly payment but still be a poor cash-flow fit if the upfront tax drains your reserves. Put the stamp duty result next to the mortgage payment, deposit and fees before deciding.

Compare with your post-move buffer

Keep money back for repairs, furniture, insurance and normal living costs. If stamp duty removes that safety margin, consider reducing the offer or waiting until the cash position is stronger.

Compare with a different region or property type

Rules and thresholds differ across the UK. If you are flexible on location or property type, a second scenario may show whether another option gives the same living outcome with less upfront strain.

FAQ

Stamp duty calculator questions people actually ask

Is stamp duty calculated on the whole property price?

No. Residential property taxes are normally banded, so different slices of the purchase price are taxed at different rates. That is why the effective rate can be lower than the highest rate reached.

Does the calculator cover Scotland and Wales?

Yes, it is designed to estimate SDLT for England and Northern Ireland, LBTT for Scotland and LTT for Wales. You still need to confirm unusual transactions with a conveyancer.

Why does buyer status matter so much?

Buyer status can change reliefs and surcharges. A first-time buyer, home mover and additional-property buyer may pay different amounts on the same purchase price.

Can I add stamp duty to my mortgage?

Usually you should plan to pay it from cash at completion. Borrowing more may indirectly free cash, but that depends on lender limits, deposit size and affordability.

Should I calculate before making an offer?

Yes. Running the number before making an offer helps you understand the full cash requirement and gives you a clearer negotiation boundary.

Is this a legal stamp duty assessment?

No. It is a planning estimate. Your solicitor or conveyancer should confirm the final tax position for the exact transaction before completion.

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