Long-tail planning checks people search for beyond “stamp duty calculator”:
- £300k standard: often only the 5% band above £250k applies (~£2,500 illustrative).
- First-time buyer ≤ £425k: relief can mean £0 SDLT when eligible.
- Additional dwelling: add the surcharge on each band — confirm current surcharge with your solicitor.
Pair with the mortgage affordability calculator for a full cost picture.