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Do I have to pay taxes on income from my website or profits?
You need to set your status as self-employed the day you started online work. If that date is a little ambiguous (as is usually the case with online business), you can start with the day you first made any money. Yes, you can deduct expenses from your revenue. But you have to be sure that the expenses were purely business related.  This is how it goes: You inform HMRC about the day you started work. HMRC will assign you a UTR (Unique Tax Reference) number. Depending on how much you make you might or might not need to pay Class 2 NI contributions. You'll need to tell HMRC how much you expect to earn in the current tax year. Finally, you'll need to complete a Self-Assessment at the end of the tax year. I highly recommend setting up a business banking account. Here is a link that discusses being part-time self-employed in the UK.