Side income tracker — free printable side hustle earnings log

In the UK, you generally need to tell HMRC about income from a side hustle if it exceeds the annual £1,000 trading allowance (a tax-free threshold for casual or small self-employed income), and you may need to register as self-employed and complete a Self Assessment tax return if your side income is regular and goes beyond this threshold — the exact rules depend on your specific situation, so it's worth checking GOV.UK or speaking to an accountant for guidance tailored to you, as this is general information, not tax advice. Whatever your income level, keeping a clear, contemporaneous record of what you've earned (and any related expenses, which can often be deducted) makes things far simpler when it comes to actually declaring it, rather than trying to reconstruct a year of earnings from memory and scattered records when a deadline looms. A useful habit many side-hustlers adopt is automatically setting aside a portion of each payment — often suggested as roughly 20-30%, though your actual tax rate depends on your total income across all sources — into a separate savings account as it comes in, so the eventual tax bill doesn't come as an unwelcome surprise drawn from money you've already mentally spent. Keeping a log also helps you see clearly whether the side income is genuinely worthwhile once you account for the time and any costs involved, and gives you the records needed if you're ever asked questions by HMRC about your income. Side income rules can be detailed and depend on your circumstances (your main employment, total income, the nature of the work), so for anything beyond very occasional small amounts, it's well worth checking the current guidance on GOV.UK directly or speaking to an accountant, particularly as your side income grows.

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