Is a Stamp Duty Refund Taxable? What HMRC Says

Stamp duty refund claims have grown rapidly as a category since 2017. With the growth has come a host of new questions: how does the cash treatment work, do I declare it anywhere, what happens at year-end, and what about the fee my claims firm charges? This article works through the tax position of an SDLT refund in clear language.

The core principle

A refund of stamp duty land tax that was overpaid is a return of tax — it's not new money you've earned. It is not income for income tax or corporation tax purposes. It does not need to be declared on a self-assessment return as income. It does not affect your personal allowance, your basic rate band, or any other income tax calculation.

This is consistent with the general UK tax principle: returns of tax overpaid are not themselves income. You weren't enriched by the refund — you were merely put back into the position you should have been in had the original SDLT been calculated correctly.

Repayment interest

Where HMRC pays interest on a long-delayed refund (under the repayment interest rules), the interest portion is taxable as income — but interest on SDLT refunds is rare and the amounts are usually small. Most surcharge reclaims and chattel reclaims are paid without interest, because HMRC processes them within their statutory timetable.

If you do receive repayment interest from HMRC, it should be declared on the appropriate page of your self-assessment return for the year it's received. The interest is usually labelled separately on HMRC's repayment notification.

The fee your claims firm charges

Most stamp duty refund firms charge a contingent fee — typically 20% to 30% of the refund recovered, plus VAT. This fee is deducted from the refund before the net amount is paid to you, in most cases. The full refund is repaid by HMRC into the firm's client account; the firm deducts the fee; the balance is forwarded to you.

Is the fee tax-deductible? In general, no — at least not for personal owner-occupier purchases. The fee relates to a personal capital event (your home purchase) and is not deductible against income for income-tax purposes. For buy-to-let landlords, the picture is slightly different: a fee related to the rental business may sometimes be deductible against rental income, but only if the underlying refund related to a property used in the rental business. Get specific advice if the amounts are significant.

DIY vs paid: the cost comparison

For a typical chattel-based SDLT refund of £2,500, a 25%-of-recovery fee plus VAT works out at around £750. A typical surcharge reclaim of £15,000 with the same fee structure costs around £4,500. These are meaningful sums.

The DIY alternative — filing the amendment or higher-rate reclaim form directly with HMRC — is free if you do it yourself, or costs whatever a conveyancing solicitor charges (typically £200-£500 for a straightforward reclaim). For surcharge reclaims that meet the standard criteria, DIY filing is usually entirely feasible. Our DIY Claim Pack walks you through the process for £19.99.

Paid claims firms add value most in complex chattel-based claims, where there are genuine borderline classification questions; in multi-property portfolio claims; and in unusual relief claims that benefit from professional argumentation. They add the least value in standard surcharge reclaims where the documentation is unambiguous.

What about capital gains tax?

When you eventually sell the property, the SDLT you originally paid is added to the property's acquisition cost for capital gains tax purposes (relevant for second homes, buy-to-let, and any non-main-residence property). If you received a refund of part of that SDLT, the refunded amount is removed from the CGT cost base. The net effect is broadly neutral over time — you pay less CGT in the year of the refund (via reduced base cost) and you paid less SDLT than you would have. But you don't double-count.