One of the most confusing things about UK Capital Gains Tax is the difference between the tax-free allowance and the reporting threshold. They’re different numbers with different rules, and mixing them up is one of the most common mistakes.<\/p>\n
\u00a33,000 \u2014 the annual exempt amount.<\/strong> This is your tax-free allowance. Gains below this aren’t taxed. Simple enough.<\/p>\n \u00a312,000 \u2014 the reporting threshold.<\/strong> This is four times the annual exempt amount. If your total disposal proceeds<\/em> (not gains \u2014 the total amount you received from all sales) exceed \u00a312,000, you must report on your self-assessment. Even if you made a loss.<\/p>\n These are fundamentally different things. The \u00a33,000 is about what you owe. The \u00a312,000 is about what you tell HMRC.<\/p>\n You need to complete the SA108 Capital Gains Summary and include it with your self-assessment if:<\/p>\n Your total disposal proceeds exceed \u00a312,000, OR<\/p>\n Your chargeable gains exceed \u00a33,000 (even if proceeds are under \u00a312,000), OR<\/p>\n You want to claim a loss (you must report losses to claim them), OR<\/p>\n You’re using losses brought forward from previous years.<\/p>\n You don’t need to report if ALL of these are true:<\/p>\n Your total disposal proceeds are \u00a312,000 or less, AND<\/p>\n Your total gains are within the \u00a33,000 annual exemption, AND<\/p>\n You don’t want to claim any losses.<\/p>\n Consider this scenario: you sold \u00a320,000 worth of shares but only made a \u00a3500 gain. You might think “I’m well within the \u00a33,000 exemption, I don’t need to report.”<\/p>\n Wrong. Your proceeds (\u00a320,000) exceed \u00a312,000, so you must report \u2014 even though no tax is due.<\/p>\n The reverse also catches people: you sold \u00a38,000 of shares and made a \u00a34,000 gain. Proceeds are under \u00a312,000, but the gain exceeds \u00a33,000 \u2014 you must report.<\/p>\n Disposals within an ISA don’t count at all. They don’t add to your proceeds total, and gains within ISAs are not chargeable. If all your trading is within an ISA, you have nothing to report.<\/p>\n Filing a self-assessment when you didn’t need to wastes time. But not filing when you should have is worse: HMRC can charge penalties for late or missing returns, and they receive data from brokers about your trading activity. The matching algorithms are getting better every year.<\/p>\n If you’re unsure whether you need to report, err on the side of reporting. There’s no penalty for filing an SA108 when it turns out you didn’t strictly need to \u2014 but there can be penalties for not filing one when you should have.<\/p>\nWhen you MUST report<\/h2>\n
When you DON’T need to report<\/h2>\n
Why the \u00a312,000 threshold trips people up<\/h2>\n
What about ISA trades?<\/h2>\n
The cost of not reporting<\/h2>\n