A guide to tax planning as a couple: how to stop overpaying

In the international bestseller The Five Love Languages, US marriage counsellor Gary Chapman suggests that people tend to express and experience love in five main ways: words of affirmation, acts of service, receiving gifts, quality time, and physical touch.

What Chapman leaves off the list is the satisfaction of paying less tax than would otherwise be necessary.

Marriage in the UK is one of the most generous financial partnerships the state recognises. Used properly, it allows couples to share allowances, shift income, shelter assets, and significantly reduce the tax they pay as a household.

In this guide, we run through the main ways couples can make the most of that arrangement, from straightforward spousal transfers to the less obvious planning opportunities that probably will not enliven date night, but may materially improve your after-tax returns.

The big lever: spousal transfers

One feature of the UK tax system is unusually generous to married couples: assets can be transferred between spouses or civil partners without triggering an immediate capital gains tax charge.

In practical terms, this means an asset can be moved from one partner to the other at its original purchase price. No tax is paid at the point of transfer. If the receiving spouse later sells, any gain is calculated from that original cost.

This matters because tax is assessed on individuals. Spousal transfers allow couples to decide which person realises income or gains, rather than having those outcomes fixed by historic ownership.

In practice, this is most often used before selling investments with large unrealised gains, or where one partner has spare allowances or lower tax rates. By transferring part of a holding in advance, couples can make use of two sets of capital gains allowances and, in some cases, lower rates, without changing the overall disposal.

The same principle applies to income-producing assets. Once ownership has genuinely changed, the income belongs to the receiving spouse and is taxed on them. There is no reporting requirement at the point of transfer, but records should be kept so the eventual tax position can be established.

The transfer does, however, need to be real. Control and ownership must follow the paperwork. If an asset is given away, the income and gains go with it. Anything that looks like a paper exercise rather than a change of ownership risks being challenged.

Property: mind the mortgage

Here's where the spousal transfer hack starts to break down.

If you give part of a mortgaged property to your spouse, HMRC ignores the fact that it is a gift. Instead, it looks at how much of the mortgage your spouse takes over. That amount is treated as if they had paid it in cash, and Stamp Duty Land Tax (in England and Northern Ireland) is worked out from there.

So the question is not, "did money change hands?"

It is "how much of the loan moved across?"

If the share of the mortgage your spouse takes on is below £125,000, there is no stamp duty to pay. If it is above £125,000, stamp duty is calculated in bands.

Here's a simple example. You own a house with a £600,000 mortgage and transfer half of it to your spouse. Your spouse is now responsible for £300,000 of that mortgage. Stamp duty is calculated on £300,000 as follows:

• 0% on the first £125,000 = £0
• 2% on the next £125,000 = £2,500
• 5% on the remaining £50,000 = £2,500

Total stamp duty = £5,000

Nothing else about the spousal transfer changes. Capital gains tax is not triggered.

The takeaway? Before changing ownership, check the loan balance.

Income tax planning as a couple

Income tax is assessed person by person, but many couples organise their finances as if that were not the case. The result is usually wasted allowances.

The aim of income tax planning as a couple is simple: make sure income is landing on the person best placed to receive it.

Using both personal allowances

Each adult has their own tax-free personal allowance (£12,570 for 2026/27). If one partner is not using all of theirs, income that could legitimately be moved across often should be.

In practice, this usually means holding savings, investments or other income-producing assets in the name of the lower-earning spouse. Once ownership has changed, the interest or dividends are taxed on them, using allowances that would otherwise go unused.

There is also a specific scheme called the Marriage Allowance, which means that if one spouse earns below the personal allowance and the other is a basic-rate taxpayer, up to £1,260 of unused allowance can be transferred. That's worth up to £252 a year in lower income tax, and you can also claim for the previous four tax years.

This is the kind of low-hanging fruit to pick before worrying about more complex planning.

The smaller allowances (worth tidying, not obsessing over)

There are a handful of narrower income tax bands that can help at the margins:

• The starting rate for savings, which allows up to £5,000 of savings interest to be taxed at 0% if other income is very low
• The personal savings allowance (£1,000 for basic-rate taxpayers, £500 for higher-rate),
• The dividend allowance (£500).

For couples, the relevance is straightforward: these allowances exist per person, not per household. Spreading savings and investments across two names can double the shelter.

Pensions: where the real leverage is

For high earners, pension planning in a couple should be about moving income out of very high tax rates today and deciding whose future income it will eventually become.

Each person has their own annual limit on how much they can contribute and receive tax relief on. But for couples, the sensible question is not "how much should each of us pay in?"

It is instead: "where does the next pound of pension saving do the most work?"

In most couples, the answer is the higher earner.

If one partner is paying tax at 45%, every pound they contribute to a pension can save 45p of tax today. For a basic-rate taxpayer, the saving is only 20p. That difference alone is enough to justify uneven contributions in many households.

Pension contributions can also be used to manage income thresholds.

Once income goes above £100,000, the personal allowance is gradually withdrawn, creating an effective marginal tax rate of 60% on part of earnings. Pension contributions reduce the income figure used for this calculation. For some couples, pensions are the cleanest way to avoid drifting into that zone.

When pension allowances shrink at the top

There is, however, a limit to how much high earners can put into pensions each year.

Under normal rules, an individual can contribute up to £60,000 a year and receive tax relief. For very high earners, that limit is gradually reduced. This is what's known as the "pension taper".

In plain terms, once total income (including bonuses and benefits) rise above a high threshold, the annual pension allowance starts to fall. At the extreme end, it can be reduced to as little as £10,000 a year.

The practical effect is this: two people in the same household can have very different pension headroom, even if their overall wealth is similar.

For example, one partner might earn enough that their pension allowance has been cut to £10,000. The other partner, earning less, may still be able to contribute the full £60,000.

If pension planning is done individually, the household may underuse the available tax shelter. If it is done jointly, contributions can be redirected to the spouse who still has room.

Pensions for the lower-earning spouse

Lower earnings do not mean pensions are irrelevant. Even a spouse with little or no earned income can contribute up to £3,600 gross per year to a pension and still receive basic-rate tax relief. In effect, £2,880 paid in is topped up to £3,600 by the government.

For wealthier couples, it's a way of moving assets into a tax-advantaged wrapper in the other spouse's name, which can be valuable later when drawing income across two people rather than one.

This can materially affect how much income can be taken in retirement at lower tax rates.

Capital gains planning as a couple

Capital gains tax (CGT) is another area where couples regularly overpay simply by acting one at a time.

Each spouse has their own annual CGT exemption. That's £3,000 per person for 2026/27. That might not be generous, but it is per head. Used properly, a married couple still has £6,000 of gains that can be realised each year without tax.

Using both exemptions before you sell

Because transfers between spouses are CGT-free, couples can rebalance ownership before selling an asset.

In practice, this often means splitting a holding that sits in one name so that each spouse realises part of the gain. Two people selling half an asset usually pay less tax than one person selling the whole thing.

This only works if the transfer happens before the sale is agreed. Once the disposal has happened for capital gains tax purposes, it is too late. The asset has to be genuinely owned by the spouse who sells it, even if only briefly.

Using the lower CGT rate where possible

Capital gains tax rates depend on your income tax position.

If one spouse is a higher or additional-rate taxpayer and the other is not, it can make sense for gains to land with the lower-taxed partner. The difference between 18% and 24% adds up quickly on six-figure disposals.

Bed and ISA, but tag teamed

ISAs remain one of the few places where future gains are ignored entirely. Each person gets a £20,000 allowance. Couples therefore have £40,000 a year between them.

A common tactic is to sell an investment outside an ISA and buy it back inside, using up the allowance and resetting the base cost. This crystallises any gain at today's tax rates, but shelters all future growth.

Couples can take this a step further by coordinating where ISA allowance sits. One spouse may sell an asset and realise a gain, while the other uses their unused ISA allowance to buy the same holding. The benefit here is capacity. Between them, couples can migrate more assets into ISAs over time than either could manage alone.

Done carefully, this allows couples to move assets into ISAs over time, crystallising gains against small annual exemptions and sheltering future growth.

Timing matters

CGT exemptions reset every tax year. Couples often spread disposals across March and April to use two years' allowances in quick succession.

Transfers between spouses are normally no gain, no loss for capital gains tax, but records still matter.

While the transfer itself is not reportable, the eventual sale may be. Large disposals can trigger reporting requirements, and non-UK residents must report UK property sales even where no tax is due.

Advanced wrappers and structures used by some couples

Once ISAs, pensions and straightforward capital gains planning are in place, some high-net-worth couples start to look at more specialist structures. These are not mainstream tools, and financial advice is usually a good idea to get them up and running smoothly.

The aim with the advanced wrappers that follow is to change who ultimately pays tax, when it is paid, and how wealth passes through the family.

Investment bonds

Investment bonds are sometimes used by couples who want flexibility over the timing and ownership of taxable income.

A key feature is that bonds can be assigned between spouses without triggering a tax charge. The tax position that matters is the one in place when the bond is eventually encashed.

This means a bond funded by a higher-earning spouse during working life can later be transferred to the lower-taxed spouse before encashment, helping to smooth income in retirement or reduce higher-rate exposure on large gains.

The outcomes, however, depend heavily on sequencing. It's a tool that makes sense only when other shelters are already full.

Trusts

Trusts are mentioned here only for completeness, but they're more about control than squeezing out tax savings.

For couples, they tend to show up in inheritance planning, particularly where there are children from previous relationships, large estates, or a desire to pass wealth down generations with strings attached rather than letting the dominoes fall where they may.

A trust lets couples separate who controls assets from who benefits from them, even after one spouse has died.

If you want the full taxonomy, we have a separate guide on trusts. For present purposes, the important thing is this: trusts have their own tax rules, they are rarely generous, and the reporting requirements can be a headache. This is firmly in "get advice" territory.

Family investment companies

Some affluent couples go a step further and use a family investment company (FIC) to hold and grow investment wealth.

In simple terms, the couple keeps shares that lock in today's value, while growth shares sit with the children or a family trust. Future growth then piles up inside the company, taxed at corporation tax rates, with that growth sitting outside the parents' estate.

Family investment companies come with legal setup costs, ongoing admin, and a long shelf life. They usually only make sense once you are into several million pounds and thinking seriously about who gets what, and when.

Advanced wrappers: bottom line

None of these replaces the basics. ISAs, pensions and straightforward capital gains planning are the bread and butter of any couple's finances. These are the proverbial second helpings of dessert: you generally will not need to consider exploring any of these options until you have fully maxed out the simple stuff.

You also don't need to be in a couple to use any of them. Being a couple simply gives you more options.

That extra flexibility lets you separate who puts money in from who owns it, who owns it from who pays tax on it, and today's income from tomorrow's wealth.

Check out our full guide on wealth protection strategies for high-net-worth people

Property and couples

Property is often the biggest line item on a couple's balance sheet, and it plays by its own tax rules.

Some work in your favour. Others absolutely do not. The key is knowing which ones treat you like two people with two sets of allowances, and which ones insist on merging you into one – which may sound cosy, but it is usually just costly.

Your main home: one between you, not one each

When you sell your main home, any gain is often free of capital gains tax, thanks to Private Residence Relief, if you meet the conditions.

Here's the catch for couples: if you are married or in a civil partnership and living together, HMRC treats you as one unit for this relief. You can only have one main residence between the two of you at any point in time.

That means you cannot double up by having one home in each name and claiming relief twice. If you own more than one property, you must choose which one counts as your main home. If you do nothing, HMRC will decide for you, based on the facts.

There is a formal nomination process, and you must complete it within two years of acquiring a second home.

The upside is that once a property is your main home, the relief is generous. It usually covers the whole gain, even if the property is owned by just one spouse. There is no CGT requirement to put both names on the deeds purely for tax reasons.

If you do add one spouse later, that transfer is normally no gain, no loss for CGT. For Private Residence Relief purposes, the spouse you add can generally inherit your ownership history, so you do not automatically dilute the relief, but the detail depends on the facts.

Rental property: ownership matters more than you think

Rental income follows ownership, but for married couples HMRC starts with a blunt assumption.

If you jointly own a rental property, the default position is that profits are split 50:50 for tax, regardless of who paid for what. This catches a lot of couples out.

If that split doesn't reflect reality – for example, one spouse funded most of the purchase and is in a lower tax band – you can change it. But you have to jump through some hoops to do it.

The steps are as follows:

• Hold the property as tenants in common, with defined unequal shares
• Put that split into formal evidence, for example a declaration of trust
• Submit HMRC Form 17 within 60 days of signing the declaration, with the supporting evidence. Miss the deadline and it is invalid.

Transfers between spouses are normally no gain, no loss for CGT as we've seen, so shifting ownership to the lower-taxed partner is often sensible.

Stamp Duty Land Tax and couples

Stamp duty is another area where couples are treated as a single unit, and this is where people might assume there exists a clever workaround – although there usually isn't.

As we explained above, spousal transfers of property can come tied up with stamp duty if there is an outstanding mortgage attached.

Other considerations for couples include first-time buyer relief and the higher rates on additional properties.

First-time buyer relief

The reduced stamp duty rates are only available if both of you are first-time buyers. If one of you has owned a property before, you spoil the fun for your other half, even if they have never owned so much as a parking space.

Since 1st April 2025, eligible first-time buyers pay 0% up to £300,000, then 5% on the portion up to £500,000. Above £500,000 there is no relief.

Higher rates on additional properties

HMRC effectively asks the question: "does either of you already own a home?"

If the answer is yes, a new purchase is usually treated as an additional property and the higher rates on additional properties (second homes or buy-to-lets) apply.

Unfortunately, putting the purchase in the other spouse's name does diddly-squat: for stamp duty purposes, your spouse's property counts as yours. You cannot side-step the surcharge by re-shuffling names.

There is an exception if you are both selling your main residence. In that case, the higher rates usually do not apply.

Inheritance tax and estate planning as a couple

When it comes to inheritance tax, the core rule is simple and extremely generous: anything you leave to your spouse gets passed on completely untouched by HMRC.

The nil-rate band: how couples double it

Everyone has a basic inheritance tax allowance, known as the nil-rate band. It currently stands at £325,000 where it has been frozen since 2009/10.

If, on your death, you leave everything to your spouse, none of that allowance is used. Because spousal transfers are exempt, the allowance just sits there unused.

The clever bit is what happens next. When the surviving spouse later passes away, their estate can claim:

• Their own £325,000 allowance, plus
• Whatever proportion of their partner's allowance went unused.

Leave everything to your spouse and you pass across 100% of your allowance. The result is that a married couple can currently pass on £650,000 free of inheritance tax, even if all the tax is assessed on the second death.

The residence nil-rate band: the extra layer (with conditions)

On top of the basic allowance sits the residence nil-rate band. This is an additional allowance of up to £175,000 per person, available when a home is left to direct descendants, such as children or grandchildren.

As with the basic band, this allowance is transferable between spouses. If the first spouse leaves the home to the survivor rather than straight to the children, their unused residence band can be carried forward and used later.

Add everything up, and a married couple can pass on up to £1 million free of inheritance tax:

• £650,000 from the basic allowances
• £350,000 from the residence allowances

Now for the fine print: the residence allowance only applies to a property you actually lived in, and it must go to direct descendants. It also tapers away for larger estates: once an estate exceeds £2 million, the allowance is reduced by £1 for every £2 over the threshold. Go far enough over, and it disappears completely.

More bad news: that £2 million test is applied to the estate on the second death, and it does not double just because you are a couple.

Gifting: two people, two sets of allowances

Lifetime gifting is another big lever for couples.

If you give assets to an individual and survive seven years, the gift falls out of your estate entirely. Pass away sooner, and inheritance tax may apply, with relief reducing the bill after three years.

As a couple, your gifting allowances get multiplied by two. Each of you can do the following:

• Give away £3,000 per tax year outright, inheritance tax-free
• Make multiple small gifts of up to £250
• Make larger gifts that start the seven-year clock ticking.

Used consistently, these allowances allow couples to move wealth out of their estates gradually, ensuring their heirs lose less to the taxman.

There's also another exemption for gifts made out of surplus income, which can be an option for high earners, although it needs careful record-keeping to demonstrate the gifts were genuinely affordable.

Bottom line

Marriage gives you the full five love languages, plus a sixth: moving money around legally so HMRC takes a smaller bite. Most of the wins in this guide come from treating the household as one plan, while remembering the tax system still taxes two people.

Once you move beyond the basics into pensions at the taper, property restructuring, trusts, investment bonds or family companies, that is usually the point where proper financial or tax advice pays for itself.

Get the sequencing right, and the only person sulking will be the third-wheeling taxman.

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