---
title: Stamp Duty Costs Calculator Guide for UK Practitioners (2026/27)
description: When building or updating a Stamp Duty Costs calculator for the 2026/27 tax year, practitioners must account for the reversion to historic thresholds. Stamp Duty Land Tax (SDLT) is a tax on land transactions, not documents, applying to any acquisition…
url: "https://www.accountingfirms.co.uk/knowledge-bank/stamp-duty-costs-calculator/"
updated: "2026-08-11"
category: Tax calculators
---

# Stamp Duty Costs Calculator Guide for UK Practitioners (2026/27)

When building or updating a Stamp Duty Costs calculator for the 2026/27 tax year, practitioners must account for the reversion to historic thresholds. Stamp Duty Land Tax (SDLT) is a tax on land transactions, not documents, applying to any acquisition of a chargeable interest in land.

Crucially, the temporary increase to residential nil-rate thresholds ended on 31 March 2025.  For transactions with an effective date on or after 1 April 2025, the standard residential nil-rate threshold returns to £125,000.

## Standard Residential Rates and First-Time Buyers

Your [Stamp Duty](https://www.accountingfirms.co.uk/blog/building-trust/) Costs calculator must apply the revised standard rates for residential property purchases in England and Northern Ireland.

### **Table: Standard Residential SDLT Rates (2026/27)**

| Chargeable Consideration | SDLT Rate |
| --- | --- |
| Up to £125,000 | 0% |
| £125,001 to £250,000 | 2% |
| £250,001 to £925,000 | 5% |
| £925,001 to £1,500,000 | 10% |
| Over £1,500,000 | 12% |

For [First-Time Buyers](https://www.accountingfirms.co.uk/blog/first-time-buyer-relief-for-sdlt-and-investment-property-trap/) (FTB), the withdrawal of the temporary relief means the nil-rate threshold reverted to £300,000 from 1 April 2025, and the maximum property value eligible for this relief returned to £500,000.

## Additional Dwellings and Corporate Purchases

Section 51 of the Finance Act 2025 introduced increased [higher rates](https://www.accountingfirms.co.uk/blog/high-income-child-benefit-charge-not-just-for-higher-rate-taxpayers/) for purchases of additional dwellings.  A 5% baseline surcharge now applies over the standard rates.

> In Schedule 4ZA to FA 2003 (higher rates of [stamp duty land tax](https://www.accountingfirms.co.uk/blog/stamp-duty-on-second-home/) for additional dwellings etc), for the Table A in section 55(1B)... substitute— TABLE A: RESIDENTIAL... So much as does not exceed £125,000 [at] 5%"

### **Table: Higher Rates for Additional Dwellings (FA 2025, s 51)**

| Chargeable Consideration | Higher SDLT Rate |
| --- | --- |
| Up to £125,000 | 5% |
| £125,001 to £250,000 | 7% |
| £250,001 to £925,000 | 10% |
| £925,001 to £1,500,000 | 15% |
| Over £1,500,000 | 17% |

Furthermore, for corporate clients, section 53 of the Finance Act 2025 increased the single rate of SDLT payable by [companies and non-natural persons](https://www.accountingfirms.co.uk/blog/deadline-to-benefit-from-increased-sdlt-threshold-approaching/) acquiring "higher threshold interests" (dwellings over £500,000) from 15% to 17%.

## Integrating Devolved Property Taxes

A comprehensive [Stamp Duty](https://www.accountingfirms.co.uk/blog/is-there-vat-on-stamp-duty/) Costs calculator must automatically route Scottish and Welsh properties to their respective devolved tax regimes.

### **Scotland: Land and Buildings Transaction Tax (LBTT)**

The Scottish Parliament sets LBTT rates. For 2026/27, the residential nil-rate band sits at £145,000, rising to 2% up to £250,000, 5% up to £325,000, 10% up to £750,000, and 12% thereafter.  First-time buyers benefit from an increased nil-rate ceiling of £175,000.  Notably, the Additional Dwelling Supplement (ADS) applies as a flat 8% surcharge on the total purchase price.

### **Wales: Land Transaction Tax (LTT)**

The Welsh Revenue Authority manages LTT.  For 2026/27, the Welsh residential nil-rate band covers the first £225,000 of consideration.  Rates then progress to 6% up to £400,000, 7.5% up to £750,000, 9% up to £1.5m, and 12% above this threshold.

 

*Next steps for research: Review the [incoming "property rates" of income tax](https://www.accountingfirms.co.uk/blog/hmrc-payment-niers/) (22%, 42%, 47%) legislated in Section 7 of the Finance Act 2026, which take effect in the 2027/28 tax year, to evaluate long-term corporate vs individual property holding structures.*