SDLT on English development acquisitions: cashflow questions and scenarios

Define the acquired interest before the tax rate

Record the legal interest, existing buildings and use, buyer, completion date, linked transactions and any relief claimed. Ask the adviser to confirm the classification and chargeable consideration rather than choosing the cheapest result in the spreadsheet.

HMRC publishes different residential and non-residential schedules. This guide’s arithmetic covers only an assumed straightforward English non-residential freehold purchase. It does not calculate residential surcharges, a corporate acquisition, a lease or a mixed portfolio.

Sources: HM Revenue & Customs: Stamp Duty Land Tax: overview; HM Revenue & Customs: Rates for non-residential and mixed land and property

Apply the published non-residential bands

On the HMRC schedule accessed on 18 September 2026, non-residential consideration is charged at 0% up to £150,000, 2% on the next £100,000 and 5% above £250,000. A fictional £1m chargeable consideration produces £39,500.

Sources: HM Revenue & Customs: Rates for non-residential and mixed land and property

Reconcile contract price to the tax base

If the adviser confirms that another £200,000 is included in chargeable consideration, the same simplified calculation gives £49,500, an increase of £10,000. This is a sensitivity, not a statement that every deferred or contingent payment is immediately taxable in full.

VAT, assumed liabilities, overage, options and linked arrangements require specific analysis. Keep the adviser’s conclusion and the contract reference beside the input so the land-price cell is not silently reused as the tax base.

Fund the payment on its due date

Model the tax payment separately from the deposit and land completion balance. Record the effective date and filing/payment requirements for the transaction; do not defer cash merely because the project has not started construction.

If the land lender excludes acquisition taxes from eligible costs, the £39,500 must come from equity or another permitted source. The tax can therefore increase peak equity even when the headline loan-to-cost ratio appears unchanged.

Lock the conclusion before exchange

The acquisition checklist should record who confirmed classification, which rates apply, what relief is assumed and what would invalidate it. Recalculate after a change in consideration, buyer structure or completion date.

Use the marginal calculation as an audit check against the adviser’s figure. Resolve differences rather than overwriting one number; the discrepancy may reflect transaction details that the simple model excludes.