What SDLT Is and When You Pay It
Stamp Duty Land Tax is a tax HMRC levies on residential and non-residential property purchases in England and Northern Ireland above a price threshold. It applies to freehold purchases, new and existing leaseholds, shared-ownership transactions, and any transfer where you take on debt or pay consideration in some other form (for example, taking over the seller's mortgage as part-payment). It is a buyer tax — not a seller tax — and it is charged on the consideration paid, not on the mortgage amount or the surveyor's valuation.
Where SDLT does and does not apply. SDLT only covers England and Northern Ireland. Scotland charges Land and Buildings Transaction Tax (LBTT), administered by Revenue Scotland. Wales charges Land Transaction Tax (LTT), administered by the Welsh Revenue Authority. The bands, thresholds and reliefs differ in each nation, and the gap is wider than most buyers realise — at £600,000, the LBTT bill is £33,350 against an SDLT bill of £20,000. Always check which regime applies before you start budgeting.
The 14-day filing deadline. You must submit an SDLT return to HMRC and pay the tax within 14 days of completion. Your solicitor or conveyancer will normally handle the filing as part of the conveyancing process and add the SDLT amount to the completion statement, but the legal liability rests with you. Late filing attracts a £100 fixed penalty if you are up to three months late, £200 if more than three months late, plus interest on any unpaid tax. The full rules are at gov.uk/stamp-duty-land-tax.
Where SDLT does not apply or is reduced. Transfers between spouses or civil partners as part of a divorce or separation are exempt under HMRC's connected-party rules. Property left in a will is exempt from SDLT (inheritance tax may apply separately). Genuine gifts of property where no consideration changes hands are also exempt — but a gift carrying a mortgage is treated as consideration for the outstanding debt and SDLT is charged on that amount. Shared-ownership purchases are treated specially: you can either pay SDLT on the initial share at acquisition rates or elect to pay on the full market value upfront (the latter usually wins if you intend to staircase to 100% within a few years).
If you are still working out whether you can afford to buy at all, our first-time buyer mortgage checklist walks through deposit, affordability and rate selection. The mortgages hub covers porting, remortgaging and rate trends. SDLT is the upfront cost most buyers underestimate, and the only one that grows with the purchase price after every other cost is fixed.