UK Property CGT Late Filing Penalties: Rules Change

Changes to late filing penalties for UK property disposals

The rules around Capital Gains Tax (CGT) and UK residential property disposals are changing, providing some welcome relief for taxpayers who miss the property reporting deadline but subsequently declare the disposal through their Self Assessment tax return.

From 28 October 2026, changes will affect how late filing penalties are treated where a UK residential property disposal has subsequently been reported through Self Assessment.

What are the current rules?

Individuals, trustees and personal representatives who make a chargeable gain when disposing of UK residential property may need to report the property disposal and pay Capital Gains Tax within 60 days of completion.

Where a UK property disposal return is required but isn't submitted by the deadline, late filing penalties can arise.

This creates a particular issue where someone misses the original reporting requirement but later provides details of the disposal on their Self Assessment tax return. Under the current system, reporting the gain through Self Assessment does not necessarily stop penalties relating to the outstanding property disposal return.

What is changing from 28 October 2026?

Under the new rules, where a relevant residential property disposal is subsequently reported on a Self Assessment tax return, the requirement to submit the outstanding UK property disposal return will end when that Self Assessment return is submitted.

Crucially, late filing penalties relating to the outstanding property disposal return will also stop accruing from that point.

The change applies where the residential property disposal is reported in a Self Assessment tax return delivered on or after 28 October 2026.

It should help prevent taxpayers continuing to build up late filing penalties after they have already declared the disposal through Self Assessment.

Does the 60-day property reporting deadline still apply?

Yes. This is an important distinction.

The change does not remove the original obligation to report a qualifying UK residential property disposal within the statutory 60-day deadline. Nor should it be treated as an alternative way of meeting your property reporting obligations.

If you have sold or otherwise disposed of a residential property, it's therefore important to establish whether a UK property disposal return is required and whether Capital Gains Tax is due, rather than simply waiting until your next Self Assessment tax return.

Not sure where you stand?

Property disposals and Capital Gains Tax can quickly become complicated, particularly where there are questions over allowable costs, your acquisition history, reliefs or an earlier missed reporting deadline.

If you've recently disposed of a property, or you're concerned that a previous disposal wasn't reported correctly, talk to us before taking action. We can help you understand your position, meet the relevant reporting requirements and deal with any outstanding tax obligations. Call us now on 01380 723692 or email here.