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Pay your Simple Assessment bill. Check the tax calculation from HM Revenue and Customs (HMRC) and pay any tax you owe.
Tell HMRC if you've stopped being self-employed, or you're ending or leaving a business partnership - responsibilities, tax returns, letting any employees know.
If you’ve missed Self Assessment deadlines get an estimate of how much you’ll need to pay in penalties and interest
Find information on completing the self-employment section of your Self Assessment tax return.
Learn more about getting started with Self Assessment including registration, tax returns, tax bills and payments.
Find out what the Self Assessment for Agents online service is for, what you can do in the service and how to do it.
Directors may need to complete an annual Self Assessment tax return. 
Learn more about your responsibilities if you're running a small business including registration, tax returns, record keeping, tax bills and payments.
How to report your income and claim tax reliefs and any repayment due to you using the SA100 tax return.
How to pay tax on your income if you come to live in the UK - tax returns, paying National Insurance, Portable Document A1, E101 or E102, claiming relief if you're taxed twice, claiming a refund (form R43).
Don’t include personal or financial information like your National Insurance number or credit card details.
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