Marriage Allowance Calculator
✓ Verified for 2026/27Partner Incomes
Calculation Logic
Partner A transfers £1,257 of their Personal Allowance. This reduces Partner B's taxable income by £1,257, saving exactly 20% of that transfer amount in tax.
How We Calculated This
- Confirm Eligibility Conditions: Verify that both partners meet the eligibility criteria. One partner must be a non-taxpayer (earning less than the Personal Allowance of £12,570 for 2026/27). The other partner must be a basic-rate taxpayer (earning between £12,571 and £50,270 in England, Wales, or Northern Ireland). Neither partner can be a higher-rate or additional-rate taxpayer.
- Transfer Personal Allowance Portion: Under the rules, the non-taxpaying partner can transfer exactly 10% of their standard Personal Allowance to their spouse or civil partner. For the 2026/27 tax year, this transfer personal allowance spouse amount is set at £1,260 (rounded to the nearest £10 from 10% of £12,570).
- Reduce Low Earner's Allowance: Subtract the transferred £1,260 from the low-earning partner's Personal Allowance. Their tax-free threshold is reduced to £11,310 (£12,570 - £1,260). If the low earner's actual income is below £11,310, they pay no tax, making the transfer highly efficient.
- Increase High Earner's Allowance: Add the transferred £1,260 to the basic-rate taxpayer's Personal Allowance, raising their tax-free threshold to £13,830 (£12,570 + £1,260). This means they can earn an extra £1,260 before they begin paying basic-rate income tax at 20%.
- Calculate the Marriage Tax Allowance Savings: Compute the tax savings for the couple. The basic-rate taxpayer pays 20% tax on the extra £1,260 of tax-free income, which creates a tax saving of exactly £252.00 (£1,260 * 0.20) for the tax year.
- Submit the Claim Online: Claim the allowance. To secure the savings, the couple must claim marriage tax allowance online through the HMRC portal or by contacting HMRC. Once processed, HMRC updates the tax codes (appending suffix M to the recipient and suffix N to the transferor), applying the savings through payroll or Self Assessment.
Real-World Examples
This scenario details the calculations for a married couple in England where Partner A works part-time and Partner B has a full-time salary, demonstrating the standard Marriage Allowance savings.
Step 1: Verify Eligibility:
Partner A (Low earner) = £8,500.00 (Non-taxpayer, below £12,570)
Partner B (High earner) = £35,000.00 (Basic-rate taxpayer, between £12,571 and £50,270)
Step 2: Transfer 10% of Personal Allowance:
Transfer Amount = £1,260.00
Step 3: Adjust Partner A's Personal Allowance:
New Allowance = £12,570.00 - £1,260.00 = £11,310.00
(Partner A still pays £0 tax because their income of £8,500 is below the new £11,310 allowance.)
Step 4: Adjust Partner B's Personal Allowance:
New Allowance = £12,570.00 + £1,260.00 = £13,830.00
Step 5: Calculate Partner B's Tax Savings:
Old Taxable Income = £35,000.00 - £12,570.00 = £22,430.00
New Taxable Income = £35,000.00 - £13,830.00 = £21,170.00
Reduction in Taxable Income = £1,260.00
Tax Savings = £1,260.00 * 20% = £252.00 per yearThis scenario demonstrates the calculations for a couple who backdate their Marriage Allowance claim to cover the previous three tax years in addition to the current year.
Step 1: Current Year (2026/27) Savings = £252.00 (Allowance transferred: £1,260 at 20%)
Step 2: Year 1 Backdate (2025/26) Savings = £252.00 (Allowance transferred: £1,260 at 20%)
Step 3: Year 2 Backdate (2024/25) Savings = £252.00 (Allowance transferred: £1,250 at 20%)
Step 4: Year 3 Backdate (2023/24) Savings = £252.00 (Allowance transferred: £1,260 at 20%)
Step 5: Sum Total Refund:
Total Cumulative Savings = £252.00 * 4 years = £1,008.00
(HMRC will issue a bank transfer or cheque for the backdated years, and apply the current year savings through your monthly PAYE tax code.)Related Calculators
Frequently Asked Questions & Detailed Tax Guide
What is Marriage Allowance and who is eligible?
Marriage Allowance is a tax perk that allows a spouse or civil partner to transfer a portion of their tax-free Personal Allowance to their partner. To qualify:
– You must be married or in a civil partnership.
– One partner must earn less than the Personal Allowance (£12,570), making them a non-taxpayer.
– The other partner must be a basic-rate taxpayer (earning between £12,571 and £50,270). If either partner pays higher-rate tax, you do not qualify.
Step-by-Step Mathematical Calculation: Marriage Allowance
Under HMRC rules, the lower earner transfers exactly **£1,260** of their allowance to the basic-rate partner.
– The basic-rate partner’s personal allowance increases to £13,830.
– This reduces their taxable income by £1,260, saving them **£252.00 per year** in tax (20% of £1,260).
– The lower earner’s allowance drops to £11,310. As long as their income is below £11,310, they pay £0 tax.
Tax Expert Pro-Tips: Backdating Your Claim
David Vance, CTA FCA, recommends: “If you have been married and eligible for several years but haven’t claimed, you can backdate your claim for up to 4 tax years. A backdated claim can result in a cash refund exceeding **£1,250** from HMRC. Apply directly on the government website to avoid fee-charging third-party agencies.”
Legislative References
- Income Tax Act 2007 (Section 55A) – Transferable tax allowance regulations.
- Taxes Management Act 1970 – Rules for backdating personal claims.