Is it allowed to upload SA109 when submitting Self Assessment Tax Return online?

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

Hi,

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.