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You fill in a CWF1 form to tell HMRC that you are self-employed and need to do a Self Assessment. You can use it both to register or to re-register as a sole trader.
After you’ve submitted your CWF1 form, you’ll be given a Unique Taxpayer Reference (UTR) number, which you use to pay your tax return.
You’ll have to fill in details about your:
Click here to fill in your CWF1 form with HMRC.