Mods - happy for this to be a sticky if you think appropriate: If you earned more than Â£31,720 including TA Pay of more than Â£4745 in tax year ended Apr 05 you probably paid too much NI and will be due a refund. TA Pay deducts tax at basic rate assuming you have used your allowances in other employment but deducts NI Contributions as if they were the sole employer. Note, this means if you are due a NI rebate you probably also owe them tax. Employee NI Contribution for 04/05 works as follows: 11% of all earnings between Lower Earnings Limit of Â£4,745 and Higher Earnings Limit of Â£31,720. Therefore 11% of Â£26,975 or Â£2,967.25 You then pay 1% on everything else above the Higher Earnings Limit. Because of the way TA Pay is calculated, you will have probably have paid the 11% rate on bits of your pay where you should only have been paying 1%. Obviously, if you have earned less than Â£4,745 from TA and/or less than Â£31,720 in total you don't have a problem but some big earners (don't the TA love to tell their Reg counterparts how much they're on in civvy street?) can get substantial refunds. For those who think they're due one, full details available from the Refunds Line on 084591 57778. (I assume this is a weekday, working hours number) They can tell you if you're due anything from previous years as well.