SDLT budgeting should begin before a buyer commits to the purchase. A client may have calculated the deposit, mortgage repayments and legal fees while overlooking Stamp Duty Land Tax or assuming that a relief applies.
If the mistake emerges shortly before exchange, the buyer may face a funding shortfall. For the conveyancer, the question is whether the tax position was investigated, explained and kept under review.
Originally published on 18 March 2014. Updated on 3 October 2026. Tax examples below use the residential SDLT rates published by HMRC at this update.
Does your SDLT procedure identify the assumptions?
A useful procedure should show which facts were collected, how the calculation was checked and when the client was told about changes.
View Lexsure’s Stamp Duty Land Tax policy template. Adapt it to your practice and the current requirements.
Why SDLT budgeting needs more than the purchase price
The purchase price is only part of the calculation. The buyer’s circumstances, other property interests, residence status and eligibility for relief can change the amount payable.
A client’s statement that this is their “first home” should prompt appropriate questions. It should not automatically be treated as confirmation that they qualify for first-time buyer relief.
Similarly, buying a new main home does not necessarily mean the higher rates are irrelevant. The timing and circumstances of the disposal of the previous home may matter.
The same price can produce different tax bills
For an illustrative £350,000 residential purchase in England, the following calculations apply under the rates published at this update:
| Assumed tax position | SDLT |
|---|---|
| Eligible first-time buyer relief | £2,500 |
| Standard residential rates, without relief | £7,500 |
| Higher rates for additional dwellings apply | £25,000 |
These examples assume no non-UK resident surcharge, linked transactions or other special treatment. Eligibility and the applicable rates must be checked for the actual transaction.
A buyer who budgets £2,500 when the correct liability is £7,500 needs another £5,000. If the higher rates apply, the gap is substantially greater.
Check the current HMRC residential SDLT rates and reliefs rather than relying on an old quotation or saved calculation.
Give the client a written calculation and explain its basis
Provide a written calculation early enough for the buyer to budget. Explain the assumptions, any unresolved questions and what could change the result.
The file should make clear:
- The price and other relevant consideration.
- The purchasers and their relevant circumstances.
- The rates, reliefs or surcharges considered.
- Any information still needed before the calculation can be confirmed.
- When the calculation was checked and communicated.
Distinguish an estimate based on incomplete information from a calculation supported by the required facts. Tell the client which changes they need to report.
Revisit the calculation before exchange
An initial calculation should not simply be carried forward unchanged. A price adjustment, change of purchaser or delay in selling another property may affect the position.
Before exchange, confirm the relevant facts and explain any revised liability. Check that the client understands the funds required for the transaction.
Our article on SDLT risks for conveyancing lawyers considers higher-rate checks, changing client circumstances and calculation records.
Keep an audit trail of the advice
A calculator result does not establish that the correct information was entered. Retain the relevant questionnaire, supporting information, calculation and advice.
Where the position is unusual or uncertain, identify the issue and obtain appropriate specialist input. Record the question referred, advice received and how it was applied to the transaction.
For practical policy considerations, see our article on preparing a Stamp Duty Land Tax policy.
CQS procedures need to work on the file
CQS-accredited firms should check their procedures against the current Core Practice Management Standards. Written policies need to be supported by staff understanding, supervision and evidence of implementation.
The procedure should identify responsibility for gathering information, checking calculations, explaining the liability and dealing with cases that require specialist advice.
Our guide to operational policies for CQS conveyancing explains why implementation matters alongside the policy document.
Check the tax jurisdiction and filing requirements
SDLT applies in England and Northern Ireland. Wales has Land Transaction Tax and Scotland has Land and Buildings Transaction Tax, with their own rules and rates.
Where an SDLT return and payment are required, the usual deadline is 14 days from the effective date, normally completion. Earlier substantial performance can affect that date, so unusual arrangements need checking.
Consult HMRC’s SDLT guidance for the applicable requirements.
Make SDLT budgeting part of the conveyancing process
Collect the facts early, explain the calculation and check whether anything has changed before the client commits.
Leave a Reply