But then I found this page: https://www.gov.uk/capital-gains-tax/rates
The first problem with it is that it refers to higher rate tax payers, and basic rate tax payers. Well, if you have no income, then you won't fall into the "basic rate" band, so, you're not really a basic rate income tax payer (https://www.gov.uk/income-tax-rates).
But let's say I have misunderstood that point, and that one is a basic rate taxpayer if your income is below the higher rate threshold. I then follow the steps laid out:
1. Work out how much taxable income you have - this is your income minus your Personal Allowance and any other Income Tax reliefs you’re entitled to.
Easy enough: £0 - £12,570 = -£12,570
2. Work out your total taxable gains
Well, to make it easy, let's say I have total gains of £13,000.
3. Deduct your tax-free allowance from your total taxable gains.
£13,000 - £3,000 = £10,000
4. Add this amount to your taxable income.
Hmm, here's where it gets a little tricky
-£12,570 + £10,000 = -£2,570 (or, if you like £10,000 + -£12,570 = -£2,570)
5. If this amount is within the basic rate Income Tax band, you’ll pay 18% on your gains made from 30 October 2024. For gains made between 6 April 2024 to 29 October 2024, you’ll pay 10% on your gains (or 18% on residential property and carried interest).
Err, couple of problems here:
The crux of the problem for me is that, from following the instructions, I have no CGT to pay on gains of £13,000, because the figure this sequence comes to is -£2,570 - ie less than zero.
The further issue is that, following the instructions at 5., even if I’d made a gross gain of £25,000, I’d still have no CGT to pay:
£25,000 - £3,000 = £22,000
£22,000 - £12,570 = £9,430
£9,430 is below the "basic rate incom tax band", so… there's no GCT to pay!?
Seems to me that somehow you end up getting the personal allowance twice, using these instructions.
The other thing that confuses me, is that, for the sake of income tax, interest and dividends seem to be considered as "income", with additional allowances. That is to say that you can combine your personal allowance and starting rate for savings to get up to £17,570 with no income tax to pay. See https://www.gov.uk/apply-tax-free-interest-on-savings
Similarly you can combine your personal allowance and dividend allowance for a total of £13,070, with no income tax or dividend tax to pay. See https://www.gov.uk/tax-on-dividends
If, regardless of these instructions, you really only get a CGT allowance of £3,000, and completely disregard the personal allowance, then that seems more than a little inequitable compared to the position of those receiving interest or dividends.