Property
UK Commercial Lease Stamp Duty Calculator
Enter annual rent, lease term, location, and any lease premium to estimate commercial lease SDLT, LBTT, or LTT.
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Your result
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Useful next checks
- Check the inputs before relying on the result.
- Try a second scenario to compare outcomes.
- Read the guide below for context.
Intro
Use this commercial lease stamp duty calculator to estimate tax on a new commercial lease from annual rent, lease term, property location, and any lease premium. It covers SDLT, LBTT, and LTT lease rent bands checked against official sources on 20 May 2026.
What this commercial lease calculator does
The calculator estimates:
- Net present value of level annual rent.
- Tax due on rent NPV.
- Tax due on any lease premium.
- Total estimated lease transaction tax.
It is designed for quick planning before you ask a solicitor or accountant to confirm the exact filing position.
How it works
New commercial leases can be taxed in two parts. The lease premium is taxed using the selected non-residential premium bands, with the Welsh relevant-rent exception below. The rent is converted into a net present value, then rent NPV bands are applied.
This calculator assumes the annual rent stays level throughout the term and discounts future rent using the 3.5% temporal discount rate used in official lease NPV guidance.
Welsh relevant rent and premium tax
For a new non-residential lease in Wales with an effective transaction date on or after 4 February 2021, relevant annual rent of £13,500 or more removes the premium's nil-rate band. The first £250,000 of premium is then taxed at 1%, the portion over £250,000 up to £1 million at 5%, and the portion above £1 million at 6%. The rent NPV bands keep their separate nil-rate band.
Relevant rent generally means the highest annual rent over the lease term. In this calculator's level-rent model, it is the annual rent you enter; it is not total rent or rent NPV. Variable, stepped, linked or mixed leases need a separate calculation.
Example calculation
For a 10-year commercial lease in England or Northern Ireland with annual rent of 50,000 and no premium:
- The calculator discounts each year of rent at 3.5%.
- The rent NPV is about 415,830.
- The first 150,000 of rent NPV is taxed at 0%.
- The remaining rent NPV is taxed at 1%.
The estimated SDLT on rent is about 2,658.
Welsh premium example
For a new 10-year non-residential Welsh lease with level annual rent of £15,000 and a £250,000 premium:
- Annual relevant rent exceeds £13,500, so the premium has no nil-rate band.
- Premium tax is £250,000 × 1% = £2,500.
- The estimated rent NPV is about £124,749, below the separate £225,000 rent NPV threshold, so rent tax is £0.
- Total estimated LTT is £2,500.
At annual rent of £13,499, the same premium retains the £225,000 nil-rate band: (£250,000 − £225,000) × 1% = £250. At exactly £13,500 annual rent, premium tax becomes £2,500.
How to use the result
Use the estimate to compare lease terms, rent levels, and premium structures. A lower rent with a higher premium can shift tax between the rent and premium calculations, so review both parts of the breakdown.
For purchase scenarios, use the Commercial Stamp Duty Calculator.
Assumptions and limitations
- The calculator assumes level annual rent.
- It does not model rent-free periods, stepped rent, turnover rent, reviews, assignments, mixed leases, linked transactions, reliefs, historic/transitional rules, or filing deadlines.
- Enter rent inclusive of VAT where VAT applies; the calculator does not decide VAT treatment.
- Lease tax rules can be technical, especially where rent and premium interact.
- Confirm the final figure with a solicitor, accountant, or the relevant official calculator before signing or completion.
Welsh premium rule source check
On 15 October 2026 we compared the Welsh £13,500 relevant-rent condition, premium bands and the level-rent example with WRA rates and bands, WRA lease guidance (LTTA/4020 and LTTA/4110), and Schedule 6, paragraph 34 of the Welsh LTT Act. This is a source and calculator check of that specific rule, not professional tax or legal review or a new verification of every jurisdiction or lease assumption.
Sources
Frequently asked questions
What is NPV?
Net present value discounts future rent payments so tax bands can be applied to a present-value estimate of rent over the lease term.
Can I enter changing rent?
No. Version one assumes the same annual rent for the full lease.
Does a lease premium use the same bands as a purchase?
Usually, but a Welsh new non-residential lease with relevant annual rent of £13,500 or more has no premium nil-rate band. In that case, the first £250,000 of premium is taxed at 1%; rent NPV tax is calculated separately.
What is rent NPV?
Net present value discounts future rent payments back to a present-day value before lease rent tax bands are applied.
Can I model changing rent?
No. Version one assumes level annual rent throughout the lease term.
Does the calculator include VAT?
Enter rent inclusive of VAT where VAT applies. The calculator does not decide whether VAT should be charged.
How does Welsh relevant rent affect premium tax?
For a new non-residential Welsh lease on or after 4 February 2021, relevant annual rent of £13,500 or more removes the premium nil-rate band. The first £250,000 of premium is taxed at 1%, with higher portions at 5% and 6%. In this level-rent calculator, relevant rent is the annual rent entered, not rent NPV. Rent tax is calculated separately.