First-Time Buyer Stamp Duty Mistakes — 8 Things That Can Cost You Your Relief

Why Mistakes Happen

First-time buyer SDLT relief sounds straightforward — if you have never owned a home, you get a discount. But the legal definition of "first-time buyer" for SDLT purposes is broader and more technical than most people assume. HMRC regularly discovers incorrectly claimed relief and pursues buyers for the shortfall, plus interest and penalties.

Here are the eight most common mistakes.

Mistake 1: Owning an Overseas Property

The SDLT definition of "first-time buyer" applies globally. If you own a flat in Spain, a share in a family home in another country, or any other overseas residential property, you do not qualify — even if you have never owned property in the UK. Many buyers do not realise this applies to them until it is pointed out.

Mistake 2: One Joint Buyer Has Previously Owned Property

For a joint purchase, all buyers must be first-time buyers. If your partner, friend, or family member you are buying with previously owned a property — even decades ago, even if it was sold long since — the relief is lost for the entire transaction. There is no partial relief for the buyer who does qualify.

This is the single most common reason first-time buyer relief claims are successfully challenged.

Mistake 3: Inheriting a Share of a Property

Inheriting even a small share in a property — typically through the death of a parent or grandparent — counts as owning residential property for SDLT purposes. It does not matter that you did not buy it, that you did not live in it, or that you subsequently sold your inherited share. The inheritance itself is the disqualifying event.

Many buyers who grew up with no property background inherit a small share in a deceased relative's home and do not realise this affects their first-time buyer status.

Mistake 4: Having Previously Received a Property as a Gift

If someone transferred a property to you for no payment — a parent giving their home to an adult child, for example — that counts as ownership. The recipient cannot later claim first-time buyer relief.

Mistake 5: Being a Former Buy-to-Let Owner

Some buyers sell their investment property before purchasing their first home to live in, and then attempt to claim first-time buyer relief. This does not work. SDLT does not require you to currently own property — it only requires that you have never previously owned a residential property at any point in your life.

Mistake 6: Having Owned Under a Help to Buy Arrangement

Some Help to Buy and shared ownership arrangements can result in buyers having previously held an interest in residential property. If you participated in a previous shared ownership purchase and staircased to 100% or were on the title, you are not a first-time buyer.

Mistake 7: The Property Price Exceeds £500,000

First-time buyer relief disappears entirely if the purchase price exceeds £500,000. There is no tapering. Many buyers at the top end of the threshold range do not realise relief is lost in full above this price. At £500,001, standard SDLT rates apply from the first pound.

A buyer purchasing at £495,000 pays £9,750 SDLT (5% × £195,000 above the £300k nil-rate band). A buyer purchasing at £505,000 pays £15,250 in SDLT (0% on £125k, 2% on £125k, 5% on £255k at standard rates). A difference of £10,000 in purchase price results in over £5,000 of additional SDLT.

Mistake 8: Not Amending an Incorrect Return Promptly

If you discover after the fact that first-time buyer relief was incorrectly claimed — perhaps because one buyer had a forgotten share in an inherited property — the SDLT return can be amended within 12 months of the original filing date. Prompt voluntary disclosure and amendment results in a simpler resolution than waiting for HMRC to investigate.

After 12 months, HMRC can still raise an assessment for up to 4 years (or longer if it considers there was a deliberate error). Prompt action is always better.

Use our Stamp Duty Calculator at Property Passport UK to compare your liability as a first-time buyer versus a standard purchaser — and before claiming the relief, make sure you genuinely satisfy every element of the eligibility criteria described above.