Need help understanding why my UK tax code suddenly changed from 1275L to 1113L

This change in your UK tax code from 1275L to 1113L indicates that HMRC believes you're entitled to less tax-free income than the standard personal allowance. The numbers in the tax code represent the amount of tax-free income you're entitled to (divided by 10), so 1275L means £12,750 tax-free and 1113L means £11,130 tax-free. The most common reasons for this type of reduction include: receiving additional untaxed income (perhaps from a second job or rental property), owing tax from a previous year, receiving taxable benefits from your employer (like a company car or private health insurance), or simply an error on HMRC's part. I'd recommend checking your Personal Tax Account online through the gov.uk website, as this should explain the reason for the change. Alternatively, you can call HMRC directly to ask about it. If you believe it's incorrect, you can challenge it.

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Your tax code change might be related to the updated personal allowance thresholds. The standard personal allowance is gradually reduced when your income exceeds £100,000 (by £1 for every £2 you earn over that threshold). Have you perhaps had a pay rise recently that pushed you into a different bracket? Or received any other income HMRC might have become aware of?

Has anyone tried using the HMRC app to check tax code changes? I found it's much easier than the website and usually explains the reasons for changes.

I've been through this exact situation! When my tax code changed unexpectedly, I found that HMRC sometimes makes adjustments based on information they receive from third parties - like banks reporting interest, employers reporting benefits, or even estimates based on previous year's self-employment income. Since you mentioned you're on £32,000 and haven't had major life changes, the most likely culprits are: untaxed interest from savings accounts that exceeded the personal savings allowance, any small employment benefits you might have forgotten about (even things like employer-paid subscriptions), or if you've done any freelance/gig work that HMRC has become aware of. The good news is that if it's an error, HMRC will backdate any refund once you get it sorted. I'd definitely recommend checking your Personal Tax Account first as others have suggested - it usually shows the breakdown of how they calculated your new code. If that doesn't give you clarity, calling them is worth it even if the wait times are frustrating.