I have recently bought a 17BII+, superb(having owned a 10B since about 1994). I am grappling with writing a solve equation to calculate net income (after tax) by entering the gross income (before tax). The problem is UK tax has tiers at different rates, for instance 0-£5225 is 0%, next tier is £5226-£7545 at 10% and the next £7546-£39825 at 22% with everything above £39826 at 40%.

This has meant that it appears to be a lengthy formula using 'IF' and lots of parentheses. I have tried countless variations and the machine keeps saying "Invalid Equation". Any help/ thoughts please.

Many thanks

Will