Methodology
Last updated: April 2026
This page explains how our calculators derive totals and which official sources are used for SDLT (England and Northern Ireland), LBTT (Scotland), and LTT (Wales).
How calculations are performed
Residential property taxes are calculated progressively across bands: each rate applies only to the part of consideration within that band. Additional-property and non-resident adjustments are then layered based on rule-specific thresholds.
Core assumptions
Results are informational estimates for common residential scenarios. Complex transactions (mixed use, trusts, relief interactions, and unusual beneficial ownership structures) may produce different liabilities and should be reviewed by a qualified adviser.