Advice for 2 tax codes

[Littlegreywolfcub]

I have 2 tax codes - one for job in local shop where I work around 20 hours a week code is 247T and the other is for my NHS pension which is 622L.

I think I'm paying too much tax as they don't seem to add up to £12,570.

Will it be ironed out by HMRC eventually or should I be chasing this with them? TBH I had forgotten about it 'til now - but knew in April

Note - the hours in the shop can vary quite a bit - sometimes down to 16 hours per week, sometimes 27 hours etc.

Thanks for any advice.

You can log on to the HMRC app and adjust your expected income for each which should sort your tax code - I've just had to help my DD do this because of her uni term-time and holiday jobs having wonky tax codes (she'll earn a lot more in the holiday jobs having wonky but the expected income was set much lower for that one).
if you don't have one, you'll need to create a government gateway ID to log into the app.
if you dont do anything, HMRC will eventually sort it out but I would guess not until after the end of the tax year.

Thanks for that - I do have the government gateway ID but the slightly tricky part is adjusting expected income because my hours vary each week ie it probably won't ever be that accurate.

Then your tax code is only ever going to be based on a close approximation. HMRC automatically do a reconciliation at the end of every tax year (between April and October) and will let you know then if you’ve overpaid tax, in which case you can claim a refund.

If you look at the coding notices for both then that will tell you what adjustments are being made to come to the tax codes. Do you have interest or dividend income which is untaxed, for example?

Work through them and if there are any you don't understand after some googling, ask again.

Ultimately it should all work itself out when HMRC do the end of year reconciliation but better to have it as close to correct as possible in-year.

My DCs have two part time jobs each. We called HMRC and they have now split the two employers with expected income. It’s now 80/20 with the 80% being allocated to the more consistent hours employer. They got the over paid tax money back in May.

Have you checked you paid the right amount of tax for 2025-2026 tax year, yes HMRC is helpful and you can claim any overpayment via the app.

Depending on how much your pension is, you could ask HMRC to allocate the full personal allowance to your pension, that might be easiest. Then they might then use a BR or 0T code for the shop.