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How do I submit my tax return online?

To file your return in this way, you’ll need to register online and request an ‘activation PIN’ from the HMRC website. To do this, you’ll need your Unique Taxpayer Reference (UTR), which you’ll find on form SA100 of your tax return, as well as your National Insurance Number or postcode. It can take up to a week to receive your account password and become fully registered, so don’t wait until the last minute! Once you have completed your form, just make sure you print a copy off or save one on your computer, so you can still refer back to it if necessary.