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  • Filing of SA109 form

    My husband is completing his self assessment for the tax year 2021/22 via HMRC online service. He is entitled to claim split year treatment for this tax year, so SA109 form has to be filed. We just noted that HMRC online service doesn't support SA109 form. Please advise if he can file the main self assessment tax form SA100 with the other supplementary forms via HMRC online service and mail the SA109 paper form to HMRC alone.