Stamp Duty is usually the first number to check
In England, Stamp Duty Land Tax is calculated on portions of the purchase price. First-time buyer relief, additional-property rules, replacement of a main residence, and non-standard transactions can change the result.
Because Stamp Duty can change the cash needed by thousands of pounds, check your calculator result against the official GOV.UK Stamp Duty guidance before acting.
If you are buying in Scotland, Wales, or Northern Ireland, the property tax rules are different, so an England SDLT estimate is not enough.