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Yep, I did that, so in theory my tax bill from employment should be 0, as it should have been accounted for by the tax I've paid as shown on P45/P60, except that I've already been told I'd underpaid some via some earlier in the year, and as I understand it, am already paying that back via increased PAYE.
The total tax bill is some £70 higher than expected, annoyingly it doesn't tell me what of this is from which income so I'm assuming it's the deficit mentioned above, but I'm already paying this via PAYE so it won't show up until next year's P60 comes. Hopefully it'll come back to me at that point, but It's pretty unclear.
You should be able to enter what you've already paid the tax return I'd have thought
In the Employment section I had
'Pay from this employment – the total from your P45 or P60 – before tax was taken off'
And
'UK tax taken off pay in box 1' (i.e. above figure)
I corrected the 'Pay from this employment' bit and the correct figure was used in the calculation at the end. I'd think your additional PAYE contributions would/should be included in the 'UK tax taken off pay in box 1' bit?
So it wasn't that I submitted it and then later was told I'd overpaid, the provisional overpayment was calculated on the basis of what I was about to submit.
If that makes sense.
(I am most definitely not qualified to offer advice)