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How long does it take for tax code to change after you've done self assessment for child benefit?

Hi, my income was around £55k last year according to my P60, so straight away in April I filled out a self assessment, knowing I will have to pay back about half of my child benefit (3 kids so its quite a bit). I had an email acknowledgement saying I should be able to see any changes to my account within 72 hours but nothing was showing, I would have thought I would have a new tax code by now? Or does it not update until next April? I'm just worried about owing money and want to budget for paying it back! 

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  • Dazed_and_C0nfused
    Dazed_and_C0nfused Posts: 19,376 Forumite
    10,000 Posts Sixth Anniversary Name Dropper
    Hi, my income was around £55k last year according to my P60, so straight away in April I filled out a self assessment, knowing I will have to pay back about half of my child benefit (3 kids so its quite a bit). I had an email acknowledgement saying I should be able to see any changes to my account within 72 hours but nothing was showing, I would have thought I would have a new tax code by now? Or does it not update until next April? I'm just worried about owing money and want to budget for paying it back! 
    I think you have got a little confused with your tax years.

    Tax owed under Self Assessment for 2023-24 will not be included in your tax code for this year, it is your 2025-26 tax code that is changed for this liability.

    Depending on how you have completed the return HMRC do sometimes update your code for the current tax year (2024-25) to start collecting extra tax towards any HICBC for the current tax year.

    But as the lower HICBC threshold has increased to £60,000 this might not be relevant for you anyway.
  • KaratePigeon
    KaratePigeon Posts: 322 Forumite
    Part of the Furniture 100 Posts Photogenic Name Dropper
    Ok thanks, so I can expect my tax code to be changed on 6th Apr 25 (or maybe earlier), and then it'll just get taken out of my salary over the 12 months after? I know the threshold has increased but as I understand it I still need to pay it back for 2023-24 as I earned over the 50k threshold that was in place then. If my income stays below 60k I won't need to pay it back for any other years. 

    Is that correct? 
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