Tax Benefits of Marriage: What You Gain and What Changes If You Split

By Iblal IqbalPublished 24 September 2026Last reviewed 24 September 202612 mins read11 sections

Part of: Financial Settlement after Divorce

The tax benefits of marriage are real, but narrower than most couples expect. Spouses and civil partners can share part of a tax-free allowance, move assets to each other without Capital Gains Tax, and leave each other their estate free of Inheritance Tax. If your marriage is now ending, every money decision can feel heavy, and these reliefs matter, because some change from the day you stop living together (TCGA 1992, s.58). Our financial settlement after divorce specialists assist and advise on how that fits into the wider split.

This guide explains the main tax advantages of marriage in the 2026-27 tax year, and what happens to each when you separate. The family law is for England and Wales, and the tax rules are UK-wide apart from Scotland’s own Income Tax bands. This is general information, not tax advice. We are family law specialists, not tax advisers, so also speak to a qualified tax adviser.

Reviewed by: Garry Steedman, Family Law Consultant (Divorce, Children & TOLATA), Kabir Family Law

What are the tax benefits of marriage? UK rules for 2026-27

Marriage or a civil partnership opens three main reliefs: Marriage Allowance, tax-free transfers between you, and the Inheritance Tax spouse exemption. Married Couple’s Allowance also helps, but only where one of you was born before 6 April 1935 (GOV.UK).

Living together is not enough. GOV.UK rules out Marriage Allowance for couples who live together without marrying or forming a civil partnership. HMRC’s own manual takes the same line for Inheritance Tax, however long the relationship lasts (IHTM11032). Couples who trust the myth of common law marriage can learn too late that none of these reliefs applies.

Marriage does not change your tax band, either. Each of you keeps your own Personal Allowance, £12,570 for most people in 2026-27, and pays Income Tax on your own income (GOV.UK). So the tax benefits of marriage come from a few reliefs, not from pooling your incomes. The catch is that each relief depends on the marriage, and each one changes on its own timetable when the relationship ends.

How does Marriage Allowance cut your tax bill?

Marriage Allowance lets the lower earner hand £1,260 of their Personal Allowance to their spouse or civil partner. That cuts the partner’s tax by up to £252 in the tax year, which runs from 6 April to 5 April (GOV.UK). The law sets the amount at 10% of the Personal Allowance, rounded up to the nearest £10 (ITA 2007, s.55B).

GOV.UK says all of these must apply:

• the two of you have married or formed a civil partnership;
• the lower earner pays no Income Tax, or earns below the Personal Allowance, usually £12,570;
• the other partner pays basic-rate tax, usually on an income between £12,571 and £50,270.

Marriage tax benefits UK-wide follow these rules, but in Scotland the receiving partner must pay the starter, basic or intermediate rate, usually on £12,571 to £43,662. You can also backdate a claim to 6 April 2022.

The part people miss: Marriage Allowance renews every year until someone cancels it. After a divorce, dissolution or legal separation, you must cancel it. The change may then reach back to 6 April, and GOV.UK warns that one of you might underpay tax for the year (GOV.UK: if your circumstances change). Nobody needs a surprise tax bill mid-separation.

Can you pass assets to your spouse tax-free during a marriage?

Yes, in most cases. Spouses and civil partners who live together pay no Capital Gains Tax on assets they give or sell to each other. The law treats each transfer as producing neither a gain nor a loss (TCGA 1992, s.58(1B)). It is one of the most useful tax advantages to being married. But the tax does not vanish: if your spouse later sells, their gain runs from the value when you first owned the asset (GOV.UK).

“Living together” has a specific meaning. Unless the marriage has broken down and you have separated by court order, by formal deed or in a way likely to be permanent, HMRC treats you as living together, even in two homes (HMRC helpsheet HS281).

That rule cuts both ways. Once the marriage breaks down and you live apart, HMRC values a transfer outside the rules at market value, so the person giving it may face a taxable gain. It is one of the tax benefits a marriage quietly loses when it ends. Our guide to Capital Gains Tax when you divorce explains more.

What does marriage mean for inheritance tax?

Inheritance Tax is where the benefits of marriage can be largest. There is normally no Inheritance Tax to pay if you leave everything above the £325,000 threshold to your spouse or civil partner. If your estate is worth less than your threshold, the unused part moves to your partner’s threshold when you die (GOV.UK).

The exemption comes from IHTA 1984, s.18. A cap applies if you are a long-term UK resident and your spouse is not, so couples with ties abroad need specific advice. HMRC’s manual adds that separated spouses still count as spouses, but divorced couples do not (IHTM11032).

Wills catch people out too. Marriage usually cancels an earlier will (Wills Act 1837, s.18). Without a will, a surviving spouse takes a large share, or everything if there are no descendants (AEA 1925, s.46), unless a judicial separation order is in force (MCA 1973, s.18(2)). After a divorce, the will usually works as if your former spouse had died (s.18A). Until then, an old will leaving everything to your spouse still stands, even years after you separate.

What other financial benefits of marriage should you know about?

The benefits of marriage UK law recognises go well beyond tax. On divorce, the court can order maintenance, lump sums and other provision between spouses (MCA 1973, s.23). To decide what is fair, it must weigh each person’s contribution to the family, including looking after the home, and any benefit a spouse loses the chance of acquiring through the divorce (MCA 1973, s.25(2)). Unmarried partners have no claim under these rules.

When people weigh up the benefits of getting married, UK tax rules are only part of the picture. Bereavement Support Payment, for example, sets unmarried partners who lived together an extra condition (GOV.UK). Planning to marry with assets to protect? Our prenuptial agreement specialists assist and advise.

This is also why the way you divide things matters. GOV.UK says that on divorce you need a financial consent order to make an agreement about money and property legally binding. Without one, what you settled at the kitchen table may not hold.

What happens to the tax benefits of marriage when you split up?

A separation rarely starts on a date you plan. For tax, though, the day you stop living together can matter as much as the divorce itself.

Transfers between you. They stay free of gain and loss until the end of the third tax year after the year you separated, or until the court grants your divorce, whichever comes first (TCGA 1992, s.58(1C)). In HMRC’s example, a couple who separated on 1 December 2025 can transfer on that basis until 5 April 2029. A formal divorce or separation agreement, or a court order, removes the time limit.

Your home. If you move out, Private Residence Relief covers the time you lived there plus your final 9 months of ownership. Keep a share and sell more than 9 months after moving out, and full relief may not be due. A special choice can help when the sale follows a formal agreement or court order, but it rules out the same relief on a new home for that period (HS281).

Put together, these rules reward timing. The informal tax-free window can shut on the day the court grants your divorce. After that, only a formal agreement or court order keeps a transfer tax-free. So the order in which you divorce and settle your money deserves real thought.

When does the tax clock start after you stop living together?

It starts in the tax year you stop living together, in HMRC’s sense. This 2026-27 guide shows what follows.

Dates like these are easy to miss. If one of you has moved out, or is about to, book a free initial consultation. One of our specialists will give you initial advice on how your separation and your money fit together.

Tax benefits of marriage checklist: are you on track?

Use this short check to see where you stand before anything changes hands.

Frequently asked questions

Expert Tip

Many people ask us whether to move savings or property into one name before a divorce starts. Doing it quietly rarely helps. The court looks at the property and resources each of you has, and a transfer after you stop living together can carry a tax cost if the timing is wrong. Note the date you separated, keep a record of who holds what, and take advice before anything changes hands.

Iblal Iqbal, Partner & Family Law Strategist