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Posted Mon, 16 Jan 2023 12:50:41 GMT by Canon Tsang
Hi Support team, It's found that SA109 couldn't be submitted respectively online. So may I upload SA109 when submitting Self Assessment Tax Return online? Thank you very much and have a good day : ) Your Sincerely, CT
Posted Thu, 19 Jan 2023 15:56:44 GMT by HMRC Admin 5

You cannot attach it as a pdf as it needs to form part of the tax return.

You will need to use 3rd party software to file the whole tax return. Details can be found here:

Self Assessment commercial software suppliers

Thank you.

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