> forgive me if I am wrong. what I can see from rudimentary search on IR35 is that it is meant to make people pay the same tax whether. employed or working as a contractor.
It's not that you're wrong, it's that what you're suggesting is naive.
There is no "equivalent" tax rate when working through a limited company and when IR35 applies per contract and not per worker.
That's just not how tax works here. Instead you pay an accountant to estimate your accounts, hand them to HMRC and they either accept them as correct or hold a tax investigation.
HMRC can't and won't tell you what you should pay, they just say yes or no to the estimate you provide them.
There is no way to know what a potential future fine might be because they could reopen all previous year's tax returns.
If they can't tell you then how can anyone else know what they should set aside?
I have also worked as a contractor (In Denmark, though). Working as a contractor in software development is rather forgiving, as there are only insignificant expenses. Therefore I can report most / all of my revenue as profits and pay full income tax. Knowing the basics of the Danish tax code, I can estimate my contribution and just pay it on a monthly basis to SKATs (Danish IRS) bank account. EOY I will report all my deductions, banks report all my capital gains, etc. and SKAT calculates the tax true rate and automatically pays me back within a week. If I forgot something, I can change merely change my reporting and everything is recalculated instantly.
However, hearing about the systems in other countries makes me appreciate the Danish system.
It's not that you're wrong, it's that what you're suggesting is naive.
There is no "equivalent" tax rate when working through a limited company and when IR35 applies per contract and not per worker.
That's just not how tax works here. Instead you pay an accountant to estimate your accounts, hand them to HMRC and they either accept them as correct or hold a tax investigation.
HMRC can't and won't tell you what you should pay, they just say yes or no to the estimate you provide them.
There is no way to know what a potential future fine might be because they could reopen all previous year's tax returns.
If they can't tell you then how can anyone else know what they should set aside?