Warrener Stewart helping individuals navigate Residential Capital Gains Tax compliance and minimise tax exposure

1 September 2025 • Battersea, Chelsea, Chiswick, Fulham, Hammersmith, HMRC, Kensington, Knightsbridge, Mayfair, Putney, Wandsworth, Wimbledon

As more individuals sell non-primary residential properties in the UK, including buy-to-lets, Warrener Stewart’s tax team has seen a marked increase in clients unaware that such sales often trigger a Capital Gains Tax (CGT) reporting requirement.

As a result, many people are being caught out by unexpected late-filing penalties as well as accruing late-payment interest.

New legislation flying under the radar

In April 2020, HMRC introduced new rules designed to improve residential CGT compliance. These required many taxpayers to file a return within 30 days of completion. In October 2021, the filing window was extended to 60 days.

However, the obligation has gone unnoticed by many – leaving them facing avoidable penalties.

Complex filing requirements

The rules remain confusing – particularly for non-residents – and it’s clear that individuals need support.

Currently, UK residents must file a return if the disposal of a non-primary property, such as a buy-to-let, results in a capital gain on which tax is due. In contrast, non-UK residents are required to file a return regardless of whether the property sale results in a gain or not.

Expert support available

Whatever your circumstance, our experts can not only guide you through your filing obligations, but also help you minimise tax exposure by utilising allowances, maximising reliefs and carefully allocating losses. We work quickly and efficiently to help ensure clients avoid unnecessary fines or interest.

For further advice, contact us on 020 7731 6163 or info@warrenerstewart.com