Tax After Divorce in the UK: HMRC, Marriage Allowance, and Capital Gains
Tax After Divorce in the UK: HMRC, Marriage Allowance, and Capital Gains
Divorce changes your tax position in ways that are not immediately obvious. If you do not notify HMRC, you could end up with the wrong tax code, an unexpected bill for Marriage Allowance overpayment, or a Capital Gains Tax liability on assets you thought were exempt.
Here is what needs updating and the order that matters.
Cancel the Marriage Allowance
If either spouse was transferring £1,260 of their Personal Allowance to the other under the Marriage Allowance, this must be cancelled as soon as the divorce is finalised. The allowance is only available to married couples and civil partners.
Who needs to act: The person who transferred their allowance (the lower earner) must cancel it through their personal tax account on GOV.UK or by calling HMRC.
What happens if you do not cancel: HMRC will continue applying the old tax codes. The higher earner keeps receiving the benefit, and the lower earner keeps losing part of their Personal Allowance. When HMRC eventually catches up, you may face an underpayment notice.
The cancellation takes effect from the end of the tax year in which the divorce is finalised. So if your Final Order is granted in January 2027, the Marriage Allowance runs until 5 April 2027.
Update Your Tax Code
Notify HMRC of your change in marital status through your personal tax account or by calling the Income Tax helpline. HMRC will issue a new tax code to your employer. Key changes:
- Your Personal Allowance reverts to the standard individual allowance
- Any adjustments for Marriage Allowance are removed
- If your address has changed, update it — HMRC correspondence goes to the address on file
Capital Gains Tax on Asset Transfers
Transfers of property, shares, or business assets between spouses are normally CGT-free (the "no gain, no loss" rule). After divorce, this exemption continues for transfers made under a formal court order, but only for a limited period.
Under current rules, divorcing spouses have until the later of:
- Three tax years from the end of the tax year of separation, or
- The date of the court order
to transfer assets CGT-free. After that window closes, any transfer is treated as a disposal at market value, potentially triggering a significant CGT bill.
Transfers under a sealed Consent Order or Financial Remedy Order remain exempt from CGT throughout this period. Get the transfer done within the window — do not let it lapse.
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Stamp Duty and Land Transaction Tax
In England: Transfers of property under a divorce court order are exempt from Stamp Duty Land Tax (SDLT). You still need to file an SDLT return to claim the exemption.
In Wales: SDLT does not apply. Wales has its own Land Transaction Tax (LTT), administered by the Welsh Revenue Authority. Property transfers under a formal divorce order qualify for the LTT divorce exemption. File the LTT return with the WRA — failure to file can trigger penalties even when no tax is due.
Council Tax Single-Person Discount
If you are now living alone (or only with children under 18), you qualify for a 25% single-occupancy Council Tax discount. In Wales, apply to your local council — Cardiff, Swansea, Newport, Wrexham, or whichever Welsh authority covers your address.
The discount typically takes effect from the date of your application, not the date you started living alone. Apply as soon as your ex-spouse moves out to avoid paying full Council Tax unnecessarily. Some Welsh councils backdate the discount if you can show when the change occurred.
Council Tax Reduction Scheme (Wales-Specific)
Wales operates its own Council Tax Reduction Scheme (replacing the old Council Tax Benefit). If your household income has dropped significantly after divorce, you may qualify for a further reduction beyond the 25% single-person discount. Eligibility is based on income, savings, and household composition. Apply through your local Welsh council.
What to Do First
- Cancel the Marriage Allowance (if applicable)
- Update your personal tax account with your new name and address
- Check your tax code is correct on your next payslip
- File any SDLT/LTT returns for property transfers
- Apply for the Council Tax single-person discount
The Wales Post-Divorce Checklist includes an HMRC update checklist covering every notification you need to make, plus a Council Tax application template for Welsh local authorities.
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