Support marriage through the tax system
Reform UK · what the evidence says
An independent, source-checked look at Reform UK’s policy “Support marriage through the tax system” — what it would actually do across the things that affect your life. Every claim below quotes the source behind it. How this works.
Tax & the money you keep — Helps
minor · moderate confidence
This policy would let married couples transfer up to 25% of one spouse's personal allowance to the other, saving higher-earning partners up to around £1,000 a year in tax — a real but modest gain for a subset of married couples. The big caveat is that it only helps couples where one earns below the personal allowance threshold, and some would gain far less due to interactions with benefits and tax credits.
The evidence
- The policy would allow a spouse to transfer 25% of their personal allowance to their partner, so neither pays tax on the first £25,000 of income. — reformparty.uk (manifesto) — “introduce a UK 25% transferable marriage tax allowance as soon as finances allow, meaning no tax on the first £25,000 of income for either spouse”
- The current marriage allowance only permits transfer of 10% of the personal allowance (£1,260), saving the receiving partner up to £252 per year. — equifax.co.uk (media) — “This transfer reduces the higher-earner's tax bill by up to £252 per year (20% of £1,260)”
- Under the proposed 25% transferable allowance, the maximum saving for the receiving partner would rise to around £1,000 per year. — equifax.co.uk (media) — “This would result in a tax saving of up to £1,000 per year for the receiving partner (20% of £5,000), a significant increase from the current £252”
- Currently only around 3.9 million out of 12.4 million married or civil partnered couples benefit from the existing allowance. — resolutionfoundation.org (institutional) — “roughly 3.9 million out of 12.4 million married or civil partnered couples benefit, with around 2.7 million being in-work couples”
- A more generous transferable allowance is described by the IFS as notable but dwarfed in size by the accompanying personal allowance increase. — vertexaisearch.cloud.google.com (media) — “a "more generous transferable marriage tax allowance" is a notable giveaway, it is "dwarfed in size" by the proposed increase in the Personal Allowance”
- Around two-fifths of eligible in-work couples would gain only £1.35 per week because of interactions with benefits and tax credits. — resolutionfoundation.org (institutional) — “Around two-fifths (1.1 million) of eligible in-work couples would only gain £1.35 per week due to these interactions”
- If a non-working spouse transfers their allowance and then enters employment, their partner's tax liability increases, creating a disincentive to work. — researchbriefings.files.parliament.uk (government) — “If a non-working spouse transfers their allowance, and then decides to enter employment, their partner's tax liability would increase, effectively taxing every pound earned by the working spouse at the marginal rate of t…”
- Low take-up of the existing allowance means approximately 2 million eligible couples are already missing out. — moneysavingexpert.com (media) — “the take-up of the current Marriage Allowance has been low, with approximately 2 million eligible couples missing out”
Biggest unknown: Whether the policy is ever enacted — the 'as soon as finances allow' conditionality means there is no committed delivery date — and whether low historical take-up of the existing allowance would limit real-world gains.
Our reading: The policy unambiguously increases take-home pay for eligible couples — moving the transferable allowance from 10% to 25% of the personal allowance lifts the maximum annual saving from £252 to around £1,000 per couple. That is a real, if modest, improvement to household after-tax income for those who qualify and claim. However, eligibility is restricted to couples where one spouse earns below the personal allowance, limiting reach: under the existing (smaller) scheme, only around 3.9 million of 12.4 million married couples currently benefit. The IFS flags that even this enhanced allowance is overshadowed by the broader personal allowance increase proposed alongside it. The gain is further diluted for a significant portion of eligible in-work couples, where interactions with tax credits and benefits mean real gains of just £1.35 per week. There is also a secondary distributional issue: the mechanism creates a re-entry disincentive — a non-working spouse who enters work effectively raises their partner's tax bill, which the House of Commons Library notes is a work disincentive particularly for women. On balance, the policy delivers a clear positive on O11 — more take-home pay for a specific subset of married couples — but the effect is minor in magnitude. The conditionality ('as soon as finances allow') means there is no committed delivery timetable, and historically low take-up of the existing allowance suggests many eligible couples may not claim even if enacted.
Public finances & the next generation — Hurts
minor · moderate confidence
This policy would cut tax revenue without any stated funding source, adding to borrowing or requiring cuts elsewhere. The marriage allowance component itself is relatively modest fiscally, but it is still an unfunded commitment.
The evidence
- The policy commits to a 25% transferable marriage tax allowance but only 'as soon as finances allow', with no identified funding source or offsetting measure. — reformparty.uk (manifesto) — “Reform UK will introduce a UK 25% transferable marriage tax allowance as soon as finances allow”
- The existing marriage allowance already costs around £580 million per year. — marriagefoundation.org.uk (media) — “HMRC estimated the allowance cost £580 million in 2021/22, benefiting over 2 million couples”
- The enhanced 25% transferable allowance would increase the annual saving per couple from up to £252 to up to £1,000, implying a significantly higher fiscal cost than the current scheme. — equifax.co.uk (media) — “This would result in a tax saving of up to £1,000 per year for the receiving partner (20% of £5,000), a significant increase from the current £252”
- The IFS notes the marriage allowance element is notable but 'dwarfed in size' by the proposed Personal Allowance increase in the same package, suggesting its standalone fiscal cost is moderate. — vertexaisearch.cloud.google.com (media) — “it is "dwarfed in size" by the proposed increase in the Personal Allowance”
Biggest unknown: Whether offsetting revenue measures or spending cuts would be introduced alongside it, and whether the 'as soon as finances allow' caveat means it is never actually implemented.
Our reading: The policy reduces income tax revenue by expanding the transferable marriage allowance from 10% to 25% of the personal allowance. The current scheme costs around £580m/year; the enhanced version would roughly quadruple the per-couple saving (from £252 to £1,000), implying a materially higher annual cost — though the IFS notes this is still dwarfed by the associated personal allowance increase in the broader package. No funding offset is stated; the only qualifier is 'as soon as finances allow', which is a timing caveat, not a funding mechanism. An unfunded permanent reduction in income tax revenue worsens the debt path by increasing the structural deficit unless offset by growth effects or spending cuts — neither of which is evidenced here. The magnitude is minor rather than moderate because the marriage allowance component is fiscally small relative to total public finances, and the soft-verb qualifier introduces real uncertainty about whether it would be enacted at all. The direction is nonetheless clearly 'worsens': this is an unfunded consumption-side tax cut with no cited evidence of productivity or investment effects that would improve long-run fiscal sustainability.
Inequality & fair shares — Mixed picture
minor · low confidence
The policy gives a tax break to married couples where one earns less than the other, which could help some lower-middle-income households — but single people, single parents, and cohabiting couples get nothing, and it creates a work disincentive for second earners that could widen gender earnings gaps. The overall effect on the gap between richest and rest is genuinely ambiguous.
The evidence
- The policy would make up to 25% of income (up to £25,000) transferable between spouses, benefiting only married couples and civil partners. — reformparty.uk (manifesto) — “no tax on the first £25,000 of income for either spouse”
- The existing marriage allowance already only reaches around 3.9 million of 12.4 million married or civil partnered couples. — resolutionfoundation.org (institutional) — “roughly 3.9 million out of 12.4 million married or civil partnered couples benefit”
- A more generous transferable allowance (modelled at 100%) would direct the largest benefits to households in the 2nd–4th income deciles, suggesting some distributional benefit within the married population. — blog.policyengine.org (media) — “households in the second through fourth income deciles benefiting the most”
- The policy creates a work disincentive for non-working spouses (often women): if the non-working spouse enters employment, the working partner's tax rises, effectively penalising the second earner. — researchbriefings.files.parliament.uk (government) — “their partner's tax liability would increase, effectively taxing every pound earned by the working spouse at the marginal rate of tax”
- The House of Commons Library flagged that such policies could create a 'strong disincentive for women to work'. — researchbriefings.files.parliament.uk (government) — “such policies could create a "strong disincentive for women to work"”
Biggest unknown: Whether the gain to lower-middle-income married couples outweighs the exclusion of non-married households (who are disproportionately lower income) and the secondary-earner work disincentive effect.
Our reading: The distributional effect of this policy pulls in two directions. Within the married-couple population, the evidence from a comparable modelled policy (E13) suggests benefits flow disproportionately to the 2nd–4th income deciles, which is mildly progressive relative to that subgroup. However, the policy is marriage-specific: it delivers nothing to single people, single parents, and cohabiting couples — groups that are concentrated in lower income deciles. The policy therefore transfers resources to a subset of households defined by legal marital status, not by income need. This structural feature means that much of the gain goes to households that are not the poorest, while the households that are excluded include many of the most economically vulnerable. On top of this, the secondary-earner disincentive (E15) is well-evidenced: it structurally penalises the spouse who enters work, a dynamic the House of Commons Library links to depressed female employment (E14). Long-run suppression of second-earner (often women's) earnings would widen the gender earnings gap, which is itself a dimension of inequality. Balancing these two effects — some benefit to lower-middle-income married couples against structural exclusion of non-married low-income households and a work disincentive — produces a genuinely mixed verdict. Neither effect is large enough to dominate on the available evidence, and confidence is low because no direct distributional modelling of this exact policy (25% transferable, £25,000 threshold) is available in the provided evidence.
Cost of living — Mixed picture
minor · moderate confidence
This policy would cut tax bills for some married couples — up to around £1,000 a year for those who benefit — but it excludes single people, cohabiting couples, and the lowest earners who pay no tax anyway, and it may actually discourage the second earner (often a woman) from going back to work. The net gain for most eligible couples is modest, and the policy's timing is conditional on future finances.
The evidence
- The policy would make 25% of the Personal Allowance transferable between spouses, so neither pays tax on the first £25,000 of income. — reformparty.uk (manifesto) — “introduce a UK 25% transferable marriage tax allowance as soon as finances allow, meaning no tax on the first £25,000 of income for either spouse”
- The policy is explicitly conditional — it will be introduced only 'as soon as finances allow'. — reformparty.uk (manifesto) — “as soon as finances allow”
- The current marriage allowance allows transfer of only 10% of the Personal Allowance (£1,260), saving the higher earner up to £252 per year. — equifax.co.uk (media) — “This transfer reduces the higher-earner's tax bill by up to £252 per year (20% of £1,260)”
- Currently around 3.9 million out of 12.4 million married or civil partnered couples benefit from the existing allowance. — resolutionfoundation.org (institutional) — “roughly 3.9 million out of 12.4 million married or civil partnered couples benefit, with around 2.7 million being in-work couples”
- Moving to a 25% transferable allowance would save the receiving partner up to £1,000 per year — a large increase from the current £252. — equifax.co.uk (media) — “This would result in a tax saving of up to £1,000 per year for the receiving partner (20% of £5,000), a significant increase from the current £252”
- The IFS noted the transferable marriage allowance is 'dwarfed in size' by a proposed personal allowance increase, suggesting it is not the dominant income effect. — vertexaisearch.cloud.google.com (media) — “while a "more generous transferable marriage tax allowance" is a notable giveaway, it is "dwarfed in size" by the proposed increase in the Personal Allowance”
- The House of Commons Library warns such policies could create a strong disincentive for women to work. — researchbriefings.files.parliament.uk (government) — “The House of Commons Library noted that such policies could create a "strong disincentive for women to work"”
- If a non-working spouse enters employment after transferring their allowance, their partner's tax liability rises, effectively penalising the new earner. — researchbriefings.files.parliament.uk (government) — “If a non-working spouse transfers their allowance, and then decides to enter employment, their partner's tax liability would increase, effectively taxing every pound earned by the working spouse at the marginal rate of t…”
- Around two-fifths of eligible in-work couples would gain only £1.35 per week because of interactions with the tax-benefit system. — resolutionfoundation.org (institutional) — “Around two-fifths (1.1 million) of eligible in-work couples would only gain £1.35 per week due to these interactions”
- A fully transferable allowance could be administratively complex for tax offices to manage. — researchbriefings.files.parliament.uk (government) — “a fully transferable allowance system could be "administratively complex," requiring tax offices to track small incomes and coordinate tax code changes between spouses”
Biggest unknown: Whether the policy's fiscal cost is manageable enough to actually be introduced, and whether the work-disincentive effect on second earners offsets the disposable income gain.
Our reading: This policy would deliver a real but modest boost to disposable income for a subset of married couples — up to roughly £1,000 a year for those who can fully exploit the 25% transfer. That is a genuine cost-of-living improvement for those households. However, the gains are narrowly targeted: only married or civil-partnered couples where one partner earns below the threshold benefit at all, and only 3.9 million of the 12.4 million such couples currently use even the existing smaller allowance. A large share of eligible in-work couples would gain only £1.35 a week after tax-benefit interactions. The policy is also conditional on fiscal headroom, which the projected five-year cost figure of £391 billion for the broader Reform package puts in serious doubt. Critically, the structure of a transferable allowance creates a work-disincentive for the second earner (typically a woman): once an allowance is transferred, re-entering the workforce raises the partner's tax bill. The House of Commons Library identifies this as a 'strong disincentive for women to work', which could reduce household earnings over the medium term and partly cancel out the income gain. Overall, there is a genuine but minor direct benefit to disposable income for those who benefit, offset by a real risk that the work-disincentive effect reduces household earnings for some couples — a mixed verdict, with the improvement slight and uncertain in timing.
Good work & fair pay — Mixed picture
minor · moderate confidence
A more generous transferable marriage tax allowance would give some married couples a modest income boost, but the same mechanism creates a financial penalty for a non-working spouse — typically a woman — who returns to work, potentially worsening job take-up and pay security for that group.
The evidence
- The policy would introduce a 25% transferable marriage tax allowance, meaning no tax on the first £25,000 of income for either spouse, to make work pay and incentivise people back into the workplace. — reformparty.uk (manifesto) — “no tax on the first £25,000 of income for either spouse, to make work pay and incentivise people back into the workplace”
- The current Marriage Allowance only allows transfer of 10% of the Personal Allowance (£1,260), saving the higher earner up to £252 per year. — equifax.co.uk (media) — “This transfer reduces the higher-earner's tax bill by up to £252 per year (20% of £1,260)”
- Raising the transferable rate to 25% would produce a tax saving of up to £1,000 per year for the receiving partner. — equifax.co.uk (media) — “This would result in a tax saving of up to £1,000 per year for the receiving partner (20% of £5,000), a significant increase from the current £252”
- Take-up of the existing allowance is already low, with around 2 million eligible couples missing out. — moneysavingexpert.com (media) — “the take-up of the current Marriage Allowance has been low, with approximately 2 million eligible couples missing out”
- Around two-fifths of eligible in-work couples would only gain £1.35 per week due to interactions with other tax rules. — resolutionfoundation.org (institutional) — “Around two-fifths (1.1 million) of eligible in-work couples would only gain £1.35 per week due to these interactions”
- If a non-working spouse transfers their allowance and then enters employment, their partner's tax liability increases, effectively taxing every pound that spouse earns at the marginal rate — a strong work disincentive. — researchbriefings.files.parliament.uk (government) — “If a non-working spouse transfers their allowance, and then decides to enter employment, their partner's tax liability would increase, effectively taxing every pound earned by the working spouse at the marginal rate of t…”
- The House of Commons Library found that such policies could create a strong disincentive for women to work. — researchbriefings.files.parliament.uk (government) — “The House of Commons Library noted that such policies could create a "strong disincentive for women to work"”
- The IFS notes the transferable allowance is a notable giveaway but is dwarfed in size by the proposed Personal Allowance increase. — vertexaisearch.cloud.google.com (media) — “a "more generous transferable marriage tax allowance" is a notable giveaway, it is "dwarfed in size" by the proposed increase in the Personal Allowance”
Biggest unknown: Whether the work-disincentive effect on secondary earners (mostly women) outweighs the income gain from the allowance transfer, and how many eligible couples would actually claim it given historically low take-up.
Our reading: The policy delivers a real, if modest, income gain for eligible married couples where one partner earns less than the other: a saving rising from £252 to up to £1,000 per year under the 25% rate. For in-work couples this is a direct improvement to take-home pay. However, the structural logic of the allowance creates a countervailing effect on work incentives. When a non-working spouse transfers their allowance, re-entering the labour market triggers an immediate increase in their partner's tax bill. The House of Commons Library explicitly flags this as a strong disincentive for women to work — the group most likely to be the secondary earner. This is not a theoretical concern: the incentive structure is mechanical and built into the design. On magnitude, the gains are real but small for most recipients, and historically low take-up suggests many eligible couples will not claim at all. The policy thus produces a genuine improvement in net pay for couples who use it and where the non-working spouse stays out of work, but simultaneously risks locking secondary earners — disproportionately women — out of the labour market, worsening their job security and long-run earnings. Both effects are substantiated by cited evidence, warranting a 'mixed' verdict. The balance is close to neutral in aggregate but the distributional pattern — modest cash gain for some, structural work penalty for others — is the key story for O4.