Self-assessment penalties: how they stack up, and how to avoid them
Self-assessment penalties are designed to escalate: a nudge first, then real money, then daily charges. Most people who get hit did not set out to be late; they underestimated how the penalties compound. Here is the full stack, so you can see exactly what lateness costs. Missing the filing deadline: 31 January File even one day late and it is an automatic £100. At three months late, £10 per day starts accruing for up to 90 days. At six months, the greater of 5 percent of tax due or £300. At twelve months, another 5 percent or £300, and in serious cases up to 100 percent of the tax due. The £100 initial penalty applies even if you owe no tax, which catches people every year. Missing the payment deadline Paying late has its own ladder: 5 percent of unpaid tax at 30 days late, another 5 percent at six months, another 5 percent at twelve months, plus interest running from 1 February. Filing on time but paying late still costs you; the two deadlines are separate and both bite. Payment...