HMRC Admin 18 Response

Hi, Your wife can check if she meets Self Assessment criteria at:
Check if you need to send a Self Assessment tax return
If the criteria is not met for 2022/23 then she can contact HMRC to review and cancel the tax return:
Self Assessment: general enquiries
Thank you.

Hi, Unfortunately, we are unable to provide specific advice tailored to individual circumstances on this forum. This forum is for general queries only and is intended to help you self-serve: Self Assessment: general enquiries
Alternatively, you may wish to engage the services of a professional advisor/accountant to assist with your enquiry. 
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Hi.Unfortunately, P50 repayments cannot be made by bank transfer or BACS.
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Hi, No - your Self Assessment calculation (produced before you submit your return) will show you how much tax you owe for the 23/24 tax year. Once you submit your return, any payments on account or overpayments remaining on your record will be be deducted from the amount of tax calculated.
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Hi. For copies of older tax returns, write to us, or contact us by webchat or phone, via:
Self Assessment: general enquiries
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Hi h88, Any untaxed income you earn between 6th April 2024 and 5th of April 2025 would be declared in a 24/25 tax return, which you would file from 6th of April 2025 (the deadline for this return being received by us would be 31st of January 2026). When you file your return, the remainder of your basic rate will be applied against your untaxed income, after which the higher rate will be applied.
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Hi,You may already have paid the amount due, through payments on account or a previous years' overpayment, for example. If you would like us to check this, contact us by webchat or phone via:
Self Assessment: general enquiries
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Hi, If your wife's carer's allowance hasn't appeared on her record at this point, request that she contact us by webchat or phone via:
Income Tax: general enquiries
and we can check her record.
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Hi, Unfortunately, you can only backdate your claim for the previous 4 tax years. To cancel the transfer of Marriage Allowance, read more and apply here:
Marriage Allowance
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Hi,Yes, you can be employed and self-employed at the same time - while the tax you owe on your employed income is sent to us by your employer, you need to register for Self Employment, as a sole trader, to pay the tax and National Insurance you owe on your self-employed income. You can register and find more advice in the link below:
What a sole trader is
or by contacting us by webchat or phone via:
Self Assessment: general enquiries
Thank you.