Beyond the Big Day: 10 Real-World Advantages of Marriage in the UK

Anthony McGrath • December 29, 2025

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When we think of marriage, we usually picture confetti, cake, and romantic vows. We rarely think about tax legislation or next-of-kin status. Yet, once the honeymoon is over, the legal contract of marriage remains one of the most significant financial and legal partnerships you can enter in the UK.


While many couples successfully cohabit long-term, the law still treats married couples (and civil partners) very differently from those living together. "Common law marriage" is a myth in the UK; without that certificate, you often lack vital safety nets.



Here are 10 practical advantages of tying the knot in the UK.

1. The Marriage Allowance (Tax Break)


 If one spouse is a non-taxpayer (earning under £12,570) and the other is a basic-rate taxpayer, the lower earner can transfer 10% of their personal allowance to their partner. This can save you up to £252 a year in tax. It’s essentially free money for eligible couples.



2. The Inheritance Tax (IHT) Shield


This is arguably the biggest financial perk. Assets passed between spouses on death are usually free from Inheritance Tax, regardless of value. Unmarried partners may face a 40% tax bill on assets over £325,000. Furthermore, you can inherit your deceased spouse’s unused IHT threshold, potentially doubling the tax-free amount your children inherit.



3. Inheriting ISAs Tax-Free


 If your spouse dies, you get an "Additional Permitted Subscription." This allows you to inherit the value of their ISA savings without it counting towards your own annual ISA allowance, keeping that money wrapped up tax-efficiently.



4. Capital Gains Tax (CGT) Flexibility


Married couples can transfer assets (like shares or a second property) between themselves without triggering a CGT bill. This allows you to utilise both your annual CGT allowances before selling an asset to maximise profit.



5. Automatic Parental Responsibility


If you are married when your child is born, the father automatically shares parental responsibility. Unmarried fathers do not automatically have this right and must acquire it (e.g., by being on the birth certificate).



6. Next-of-Kin Status


 In medical emergencies, being married gives you immediate, undisputed status as next-of-kin for consultation on medical treatment.



7. Matrimonial Home Rights


 Even if the family home is only in one partner’s name, marriage gives the other spouse rights to live there and prevents the property from being sold from under them without their knowledge.



8. Pension Protection


 Many workplace and private pensions offer superior benefits to a surviving spouse compared to a cohabiting partner upon death.



9. Health and Stability


 Studies consistently show that married people tend to live longer and enjoy better mental health, attributed to the stability and support network marriage provides.



10. The Power of Commitment


 Finally, the intangible benefit. The public, legal commitment of marriage can provide a deeper sense of security and shared future that strengthens the relationship bond.


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