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What do I do with a P11D Expenses & Benefits form?
The P11D is a record of the total benefits you've received in a tax year that haven't been taxed in another way, a bit like the P60 is a record of the total pay and tax you've paid in a tax year. Note that travel for business purposes shouldn't be taxable, and if that's what's being reported on the P11D you may need to make a claim for tax relief to HMRC to avoid having to pay the tax. I'm not sure whether it's normal for such expenses to be reported there. HMRC will normally collect that tax by adjusting your tax code after the P11D is issued, so that more tax is taken off your future income. So you don't need to do anything, as it'll be handled automatically. As to how you know it's accurate, if you have any doubts you'd need to contact your former employer and ask them to confirm the details. In general you ought to know what benefits you actually received so should at least be able to figure out if the number is plausible. If your "travel" was a flight to the USA, then probably it was. If it was a bus ticket, less so :-) If you fill in a tax return, you'll also have to report the amount there which will increase the tax you owe/reduce your refund. You won't be charged twice even if your tax code also changes, as the tax return accounts for the total amount of tax you've already paid. For travel benefits, the exact treatment in relation to tax/P11Ds is summarised here.