Compute SDLT (England & NI) with the standard bands, First-Time Buyer relief and additional-dwelling / non-resident surcharges.
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Calculates Stamp Duty Land Tax (England & Northern Ireland) from 1 April 2025: progressive residential bands (0–12%), First-Time Buyer relief up to £500,000, +5% additional-dwelling surcharge and +2% non-UK-resident surcharge.