Lost tax calculator

[Relaxed]

I saw a link somewhere on this forum on calculator where I can enter company income, external PAYE income, expenses etc and then it shows four columns of tax calculation: Outside IR35, Inside IR35, Umbrella and PAYE - all on one screen - very useful. Does anyone remember where it sits?

[PerfectStorm]

https://www.nixonwilliams.com/net_pay_calculator.asp

Very accurate in my experience.

[Relaxed]

That's the one. Many thanks.