I've been trying to get my head around my finances for next year and I keep running into the same problem, which is that I can't work out what I'm actually going to take home each month with any confidence. I'm on UPS1 in the Rest of England and with the confirmed uplift my gross should be somewhere around £49,134, but the moment I start trying to account for the pension tier, the tax, the National Insurance and the student loan, I end up with three different answers depending on how I do the sums. The bit that trips me up every time is the pension, because I've read that the contribution rate applies to your whole salary once you cross a threshold rather than just the portion above it, and I'm fairly sure UPS1 sits right inside the 9.9% band but I don't trust myself to have got that right. I've tried doing it manually with the published tables but I'm never confident about the order the deductions come off in, because tax is worked out after pension comes out but National Insurance is calculated on the full gross figure, and student loan is different again and sits on gross before pension. Three different starting points for three different deductions is exactly the kind of thing that makes me mess it up. A colleague in the staffroom mentioned she'd used a teacher pay calculator to work out whether she could afford to drop to four days a week, and she said it matched her payslip almost exactly, which sounds promising but I don't know which one she used or whether it would work the same for my situation. What I really want to know is whether anyone here has actually compared one of these calculators against their real payslip and found it accurate, because I'm trying to make a decision about reducing my hours and I can't do that based on numbers I'm not sure about. The part time side of things is what matters most to me, because I've read that your pension rate is based on your actual reduced salary rather than your full time equivalent, which means dropping hours can push you down into a cheaper tier and change the maths completely. If a calculator doesn't handle that correctly then it's useless to me. I'm also wondering whether they account for things like a TLR payment properly, since I've seen it said that a five thousand pound responsibility payment only adds something like two thousand eight hundred to your actual net pay once everything is taken off, which is a big difference and not the sort of thing you'd guess at. Has anyone found one that handles all of this without needing a degree in tax law to interpret the results? And did it match what you actually received, or was it close enough to be useful but not exact? Any honest feedback would be really helpful because I'd rather know now than find out the hard way when my bank balance doesn't look like I expected it to.