Stamp Duty is a government tax charged when you buy property (and in some countries, certain other assets like shares), calculated as a percentage of the purchase price and paid by the buyer at the time of purchase.

Where Stamp Duty Applies

Stamp Duty Land Tax (SDLT) applies in England and Northern Ireland; Scotland has its own equivalent (Land and Buildings Transaction Tax) and Wales has Land Transaction Tax — all function similarly but with different rates and thresholds. Australia charges stamp duty (sometimes called "transfer duty") at the state and territory level, so rates vary depending on where the property is. Many other countries have similar property transfer taxes under different names.

How It's Calculated

Stamp duty is almost always progressive — different portions of the purchase price are taxed at different rates, similar to how income tax brackets work. You don't pay the top rate on the entire purchase price, only on the portion that falls into each band. This is a common point of confusion: someone buying a home just above a threshold doesn't suddenly owe the higher rate on the whole price, only on the amount above that threshold.

Who Pays More: Common Surcharges

  • First-time buyers often get relief or a reduced rate up to a certain price threshold, as an incentive to help new buyers onto the property ladder.
  • Additional property purchases (second homes, buy-to-let) typically carry a surcharge on top of standard rates in both the UK and Australia.
  • Overseas buyers face an additional surcharge in several jurisdictions, on top of any other applicable surcharges.

Common Mistakes

  • Forgetting to budget for it as a separate upfront cost. Stamp duty is due at completion alongside your deposit — it's not something you can typically fold into your mortgage.
  • Assuming the top rate applies to the whole price. Progressive banding means only the portion above each threshold is taxed at the higher rate.
  • Not checking for first-time buyer relief before assuming the standard rate applies. This can mean a meaningfully different amount owed for an eligible buyer.

Calculate Your Stamp Duty

Use the UK Stamp Duty Calculator or Australia Stamp Duty Calculator to get an exact figure for your purchase price and buyer type.

Frequently Asked Questions

Does everyone pay the same stamp duty rate?

No. Rates are progressive (higher portions of the price are taxed at higher rates) and vary by buyer type — first-time buyers, additional-property buyers, and overseas buyers often face different rates or reliefs in the same country.

Is stamp duty a one-time cost?

Yes, for property purchases it's paid once at the time of purchase (or shortly after, depending on the country's filing deadline) — it's not an ongoing annual cost like property tax or council tax.

Can stamp duty be added to a mortgage?

Generally no — stamp duty is typically due as a separate upfront payment at completion, paid alongside (not folded into) your mortgage, so it needs to be budgeted for in cash alongside your deposit.