A Government Gateway user ID is the 12-character identifier HMRC issues for online services.
Create one at GOV.UK when you enrol for Self Assessment. Keep the password somewhere safe — we never see a live HMRC password in this demo app, and the production product only uses it to authenticate the submission.
QuickTaxFiler helps you complete Self Assessment and supplementary forms. If you have questions, use chat or email support@quicktaxfiler.co.uk.
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