CGT catches people out two ways: they overpay by missing a relief they were entitled to, or they miss the 60-day deadline and get an automatic £100 penalty. This pack covers both, plus the 2026/27 rates and exactly how to report and pay on time.
The automatic penalty for missing the 60-day deadline starts at £100, regardless of the size of your gain, with interest and further penalties on top the longer it runs. This is £4.99, once.
£4.99, against an automatic £100 penalty for filing the 60-day return late, before any interest or further penalties. You get a download link straight away and can re-download up to 5 times over 7 days.
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Written and reviewed by James Whitfield and the UKCapitalGainsTaxCalculator editorial team.
Every figure is checked against current HMRC and GOV.UK guidance and reviewed for the 2026/27 tax year. We explain how the tax works in plain English with worked examples, not just numbers. Editorial standards · Sources · About us