Taxopedia › S › SA1S · GlossarySA1HMRC form to register for Self Assessment for non-self-employed reasons. The SA1 registers you for Self Assessment when you're not self-employed (e.g. you have rental income, dividends, foreign income). Submit online or by post.Related termsCWF1HMRC form to register self-employed for Self Assessment + Class 2 NI.Self AssessmentAnnual UK tax return system for non-PAYE income.← Back to all terms Stop dreading tax. Start ignoring it.Get a fixed-fee quote in 60 seconds. No signup, no card, no sales call. We'll just tell you what it'll cost and how fast we can file it.Get my free quoteCall +44 7799 123045