to be slightly irate with work

[StealthPolarBear]

I left a job I hated last December. Shortly before I left I went on strike with everyone else. I asked my manager at the time to email payroll to let them know and make sure it would be deducted from my final payslip. She did, and I have confirmation they've been notified.
Now, 4 bloody months later they've sent me an invoice for the strike day saying that I was paid and "as I can appreciate they want to recoup the money". I did this deliberately so I didn't get landed with a surprise bill long aftert I had forgotten the hell that was that job.

But I don't usually get paid the gross? So if they overpaid me for one day, let's say £200 gross, for argument's sake (figures are made up):

£40 tax
£20 NI
£10 pension

I would have received £120.
OK, forget the pension because presumably that's gone into my pension, not my choice but still...
If they then charge me the £200 they have overpaid me, I am £70/£80 out of pocket because they overpaid me.

Sorry, they dp not add up how embarrassing, had a different figure in mind for tax

I think the love and cuddles will help them write it off anyway! Were you a teacher? They have funny pay calculations

No, not a teacher, ironically I worked with numbers, still do. I can add up, I promise!
Do you think I should throw in a snog?

OK, sending letter, will update when I hear back (if you're not all bored to tears)
I can be drunk again if that helps :o

But you are taxed on the gross and as you lost a day's pay you will not have paid a pension contribution for that day and neither will they.

But I didn't, I gained a day, according to them. So at the time I'll have paid tax etc

There are codes for when you add or take money from payroll, I bet someone has been happily typing in the "gross up" code rather than the "pay reclaim". So, you should have had a net payment of £93.61 deducted but someone pressed the wrong button so payroll software added in the extra for tax, NI etc (grossing up) and this gross amount went through your payroll that month. As the tax and NI have gone through the books, they are asking for the net payment for the strike day, and the additional day added in error. They will be able to do an end of year reconciliation to reclaim back the employers tax and NI that they have overpaid.

As a rough calculation, for basic rate tax you can deduct roughly 21% for tax and NI (not totally on, but near enough for rough working out of take home pay). This would bring a day's wage down to roughly £115, I assume the difference would probably be pension?

Hoe that's clear, feel free to PM me if you want any additional help/I've not been clear.

You are quite within your rights to state that you cannot repay this a present, you had only a partial month's salary so had taken it on trust that they had deducted as appropriate and he money as been used. You can offer a payment plan, but I would be tempted to ask for proof of what has happened, and an explanation of how and why. You might find that the decide it's too much effort to recoup the amount (it's not like it's thousands).

Sorry for the errors, must proof read!

well I have had a reply, they hadnt made a mistake and I have to pay up :(
grr

SPB I would get some legal advice before agreeing to pay back anything. I may be wrong but I think that if you can reasonably prove that you did not realise that you had received an overpayment and subsequently spent it they cannot force you to pay them back.

Really? I'm not out to deny the money that is rightfully their but iam so annoyed that I made preparations so this wouldn't happen and yet here we are. Feel that may be clouding my judgement somewhat.
And if I don't pay, they'll just up my council tax next April :o