Can you show me the free option that existed in HMRC's portal for non-domiciled statuses? I can only find websites that contradict your point:
https://www.dtaxfiler.co.uk/blog/residence-remittance-sa109
>You will need to use commercial software that supports the SA109 form (such as DTax Filer), You cannot submit the SA109 form through HMRC’s free online service. . If you do not use compatible software, you will need to print and post your tax return instead.
Clearly they're lying and you should correct them post-haste.
You don’t have to use them, there’s a free electronic form. But it’s easier if you’re using an accounting system to just plug the numbers straight in.
>You don’t have to use them, there’s a free electronic form.
If only the IRS also had a free fillable form you can use: https://www.irs.gov/e-file-providers/free-file-fillable-form...