I'd like it to be different, but at least in Australia, the systems are so heavily stacked in favour of proprietary and SAS accounting tools that I imagine it would currently be nearly impossible to be an a professional tax accountant using free software.

The Australian Tax Office is in the process of rolling out processes where you must report payments to employees monthly online. I need to investigate, but I suspect I won't find any good news.

Meanwhile, I do all my business bookkeeping with Ledger which works well for me!