When I started work last year there was a big delay in getting me onto payroll. As I was on an emergency tax code (no idea why as I submitted my p45 on my first day), and I was paid 4 months wages in one go, I ended up paying far too much tax and NI as I got one month's allowance for 4 months of wages. This has cost me several hundred pounds.
I willbe getting a tax refund shortly, but I was wondering how it works with NI. I know that it isn't on a cumulative basis like income tax, but if I'd been paid in the correct month, rather than all one go then I would have paid a lot less.
Can i claim it back? My employers aren't being very helpful and have suggested I sort it out myself. So for example, I should have paid £50 per month for 4 months, but because I got 4 month's salary in month 4, I paid £500 in NI. Will they refund me under the circumstances?