Free Tool

SDLT Calculator

Estimate UK Stamp Duty Land Tax across residential, mixed-use and commercial deals.

Disclaimer. This tool provides an estimate based on current SDLT rules and should not be relied upon as tax advice. SDLT treatment can vary depending on specific transaction structure. Please seek professional advice.

Step 1

Effective date

The date the transaction completes — determines which rules apply.

Multiple Dwellings Relief was abolished for transactions on or after 1 June 2024.

Step 2

Transaction type

About this tool

What the SDLT Calculator calculates

Stamp Duty Land Tax (SDLT) is the transactional tax payable to HMRC on land and property purchases in England and Northern Ireland. The amount due depends on the price, the type of property, the buyer's status and whether the deal is linked to other transactions — and the wrong rate band can move the headline cost by tens of thousands of pounds.

This calculator models the rules that actually apply on real deals: residential rates with the 3% Higher Rate for Additional Dwellings (HRAD) and the 2% non-resident surcharge; first-time buyer relief; non-residential and mixed-use rates; linked transactions; and the Multiple Dwellings election available where six or more dwellings are acquired in a single transaction.

It is built for surveyors, investors, family offices and lenders who need a defensible SDLT figure at the underwriting stage — not a consumer estimate.

Methodology

How it works

How SDLT is calculated

SDLT is a slice tax. Each band of the chargeable consideration is taxed at its own rate and the totals are added. Residential and non-residential rate cards differ. Surcharges (HRAD, non-resident) are applied as an additional percentage on top of every band of the residential ladder, not just the top slice.

Linked transactions

Where two or more transactions form part of a single arrangement between the same buyer and seller (or connected parties), HMRC treats the consideration as aggregated for rate-band purposes. The calculator lets you model this by entering the combined consideration.

The 6+ dwellings election

When six or more separate dwellings are acquired in a single transaction, the buyer can elect to apply the non-residential rate card instead of the residential ladder with HRAD. For larger residential portfolios this is almost always the cheaper outcome — the calculator surfaces both numbers so you can see the saving.

Step-by-step

How to use it

01
Choose the correct rate card
Pick residential, non-residential or mixed-use. Even a single commercial unit inside the title usually shifts the whole transaction onto the non-residential ladder — worth checking before you assume residential.
02
Enter the chargeable consideration
Use the total consideration under FA 2003 — cash price plus any assumed debt, VAT where applicable, and the market value of non-cash consideration. For linked transactions, enter the aggregated total across the linked deals.
03
Mark buyer status
Tick first-time buyer relief, additional-dwelling (3% HRAD) and non-resident (2%) where they apply. Surcharges stack — a non-resident buying a second home pays both HRAD and the non-resident 2% on top of every band.
04
Test the 6+ dwellings election
If the transaction includes six or more separate dwellings, compare the residential-ladder-plus-HRAD figure against the non-residential-ladder figure. The lower of the two is what you'd elect.
05
Read the band-by-band breakdown
The output shows tax per band, the surcharge line and the effective rate. Sense-check that number against your gut before circulating to counsel or the tax adviser.

The maths

The formula, explained

SDLT is a slice tax

SDLT = Σ (band amount × band rate) + surcharges

Each band of the price is taxed at its own rate and the results are summed. Surcharges (HRAD 3%, non-resident 2%) apply as an additional percentage on every band of the residential ladder, not just the top slice.

Worked example

Second home at £750,000 (residential + HRAD)

£0 – £250,000 @ 0% (+3% HRAD) = £7,500
£250,001 – £750,000 @ 5% (+3% HRAD) = £40,000
Subtotal base SDLT = £25,000
HRAD surcharge component = £22,500

Total SDLT = £47,500 (effective rate 6.33%)

Watch out

Common mistakes

Treating mixed-use as residential

A ground-floor shop with flats above almost always sits on the non-residential rate card — cheaper for higher prices, more expensive at the bottom. Don't assume; test both.

Forgetting linked transactions

Two flats bought from the same seller in the same arrangement are aggregated for SDLT. Modelling them separately understates the tax due.

Ignoring the 6+ dwellings election

On residential portfolios of six or more units the non-residential election is almost always cheaper than the residential ladder plus HRAD. Missing it costs real money.

Overlooking non-cash consideration

Assumed debt, deferred consideration and non-cash exchange all count. The chargeable consideration is often materially higher than the cash price on the SPA.

Applying reliefs blindly

First-time buyer relief and other reliefs have strict eligibility rules. The calculator assumes eligibility is confirmed — always verify with a tax adviser before relying on the number.

Assumptions & limitations

Key assumptions

Rates reflect current HMRC SDLT bands for England and Northern Ireland. Scotland (LBTT) and Wales (LTT) are separate regimes and out of scope.
The calculator assumes the consideration entered is the chargeable consideration as defined by FA 2003 — adjust for VAT, assumed debt and non-cash consideration before entering.
Reliefs not modelled in-line (e.g. group relief, charities relief, sub-sale relief) should be applied manually to the result.
First-time buyer relief assumes the buyer meets every FTB condition and the purchase price is within the relief cap.

When you'd use it

Typical scenarios

Acquiring an investment portfolio

Model the linked-transaction position and compare the residential ladder against the 6+ dwellings non-residential election before exchanging.

Acquisitions & Disposals →RICS Red Book valuation →

Mixed-use deals

Even one commercial unit in the title can shift the entire transaction onto the non-residential rate card. Use the calculator to test both treatments and discuss with your tax adviser.

Strategic Advisory →

Lender underwriting and receivership

When pricing a loan or running a sale process, SDLT directly affects the price a buyer can bid. Build it into your net-of-costs analysis.

LPA Receivership →

FAQ

SDLT Calculator — frequently asked

Is this calculator suitable for residential and commercial property?

Yes. Toggle between residential, non-residential and mixed-use to apply the correct rate card. The calculator surfaces HRAD and the non-resident surcharge automatically when you mark the buyer accordingly.

Does it handle the 3% Higher Rate for Additional Dwellings (HRAD)?

Yes. HRAD is applied on top of every band of the residential ladder when the buyer is acquiring an additional dwelling. The breakdown shows the surcharge separately so you can sense-check the figure.

What about the 2% non-resident surcharge?

Yes — the 2% non-resident surcharge stacks on the residential ladder, on top of HRAD where both apply. Mark the buyer as non-resident to model it.

Can it calculate SDLT on the 6+ dwellings election?

Yes. Where the transaction contains six or more separate dwellings, the calculator shows both the residential-ladder figure (with HRAD) and the non-residential figure under the election, so you can see which is lower.

Is the result tax advice?

No. The calculator provides a transparent estimate based on current SDLT bands. Final SDLT depends on transaction structure, reliefs and HMRC's view of the facts — always take professional tax advice before exchanging.

Does it cover Scotland or Wales?

Not currently. SDLT only applies in England and Northern Ireland. Scottish purchases are subject to LBTT (Revenue Scotland) and Welsh purchases to LTT (Welsh Revenue Authority), which have different rate cards.

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