ISA Allowance for Couples: How It Works for Two People

Gov.uk says you cannot hold an ISA with someone else, and gives the maximum you can save in ISAs in a tax year (£20,000). gov.uk does not state "one allowance per person" in those words. Reading it as a limit for each adult, so that a married couple or two partners each have their own and the two are not pooled, is this site's own interpretation, not a rule gov.uk states. There are no joint ISAs. The main exception is when a spouse or civil partner dies, which can create an extra allowance for the survivor.

The site's rules data was last checked against gov.uk on 26 September 2026. Figures typed in this guide may not yet reflect a later change, and the descriptions of gov.uk pages are summaries that may also lag. The current figures are on the ISA rules at a glance page. General information only, not financial advice.

Does each person in a couple get their own ISA allowance?

On this site's own reading, yes. GOV.UK says you cannot hold an ISA with someone else and gives the maximum you can save in ISAs in a tax year. It does not say "one allowance per person" in so many words: reading that as a limit for each person, not for a household, is the site's interpretation and not a gov.uk-stated rule. The current figure is £20,000 for 2026-27. That tax year runs from 6 April to 5 April, and gov.uk gives the allowance for each tax year. You must be 18 or over to open an adult ISA (GOV.UK: Individual Savings Accounts).

On that reading (the site's own, as above), two adults who both meet the eligibility rules each have their own £20,000. gov.uk describes no way of moving one person's unused allowance to the other, or of carrying an unused part into a later tax year.

The gov.uk ISA pages read for this guide give the limit without distinguishing between married couples, civil partners and other adults.

Can a couple have a joint ISA?

No. GOV.UK states that you cannot hold an ISA with someone else. Every ISA belongs to a single named person, who is the account holder. A joint savings or investment account is not an ISA, so ask the provider what tax treatment applies to it.

This has practical effects:

• Each person opens, and is responsible for, their own ISAs.
• Interest, dividends and gains inside an ISA belong to that individual.
• If you want a joint pot of money, an ISA is not a way of getting one.

Whose money is paid into an ISA?

An ISA is opened in one person's name, and on the site's reading the subscription counts against that person's allowance. HMRC's guidance for ISA managers says an investor must subscribe with their own cash, with an exception for employer cash subscriptions. The consumer ISA pages read for this guide do not go into what that means when a couple manage their finances together, so this guide does not state a rule on it.

If money moves from one partner to the other so that it can be paid into the second person's ISA, that is a tax matter as much as an ISA matter, and the answer can depend on the circumstances. It is worth checking with HMRC or a regulated financial adviser rather than assuming. Your provider may also have its own requirements about how an account is funded, which you can ask about when opening it.

What if one partner has not used their allowance?

The allowance is set for each tax year. If one person pays in less than £20,000 in a tax year, gov.uk describes no way of passing the difference to their partner or of building it up for later years. On the site's reading, the other person can still pay in up to their own £20,000, but no more than that.

On the same reading, the rules on how many ISAs each person may pay into in a year are also individual. Gov.uk's how ISAs work page gives an example of saving in more than one cash ISA in a tax year, and says you can only pay into one Lifetime ISA in a tax year. The total across all a person's ISAs still counts against their single allowance. Our guide on how many ISAs you can have covers the detail, and the guide to how much you can put in an ISA each year explains how the total is counted.

A worked example of two allowances across different ISA types

This example uses assumed amounts to show the arithmetic only. They are not rule figures and are not a suggestion about how anyone should split their money. Suppose two adults, Person A and Person B, each pay into ISAs during one tax year:

The arithmetic works person by person:

• Person A paid in £6,000 + £8,000 + £2,500, which is £16,500. Their unused allowance for the year is £20,000 minus £16,500.
• Person B paid in £2,000 + £10,500, which is £12,500. Their unused allowance for the year is £20,000 minus £12,500.
• On the site's reading, nothing is combined. Person A's total is checked against Person A's allowance, and Person B's against Person B's.

Two points sit inside the numbers. First, Person A's Lifetime ISA payment counts towards their overall allowance, but the Lifetime ISA has its own yearly limit of £4,000, and a government bonus of 25% is added to Lifetime ISA payments up to a maximum of £1,000 a year. Person B has no Lifetime ISA in this example, so nothing of the sort applies to them. Second, the Cash ISA and Stocks and Shares ISA figures are simply amounts paid in. Investments in a Stocks and Shares ISA can go down as well as up, so what the account is worth later can be less than what was paid in.

You can test your own figures on the ISA allowance checker, which shows how payments across different ISA types add up against one allowance.

What happens to the allowance when a spouse or civil partner dies?

When someone dies, their ISA stops earning tax-free interest and gains at a point set by the rules, and a surviving spouse or civil partner may be entitled to an additional permitted subscription (APS). This is an extra amount they can pay into their own ISA, on top of their normal allowance. Whether it applies, how much it is and the deadline for using it depend on the circumstances and on when the death occurred. GOV.UK covers this in its section on inheriting an ISA from a spouse or civil partner, which you can reach from the main GOV.UK ISA guidance.

We explain the extra allowance step by step in our guide to the additional permitted subscription. Providers are not all set up in the same way for this, so it is a topic to raise with the provider directly.

What to check with your provider

• Does the provider accept new subscriptions to an ISA of this type from someone in my situation, and what documents does it need?
• Are there minimum or maximum payment amounts on the accounts I am looking at?
• If my partner and I use different providers, does each provider only see the payments made to its own accounts?
• If a transfer between ISAs is planned, how many days will it take, and is any of the allowance affected?
• After a bereavement, does the provider accept an additional permitted subscription, and by when?

For a broader view of the rules that apply to every ISA holder, see the ISA rules page.

Frequently asked questions

Do a husband and wife get one ISA allowance or two?

Two, on this site's own reading of gov.uk (it does not state this in so many words): gov.uk says you cannot hold an ISA with someone else and gives the limit as the amount you can save in ISAs in a tax year (£20,000), so the site reads each spouse or civil partner as having their own. gov.uk describes no way of adding the two together or moving unused allowance from one person to the other.

Can two people open a joint ISA?

No. GOV.UK says you cannot hold an ISA with someone else. Each ISA is held by one person only, and on the site's reading the payments into it count against that person's allowance.

Can I use my partner's unused ISA allowance?

gov.uk describes no way of using a partner's unused allowance or of rolling an unused part over into the next tax year. The additional permitted subscription that may be available to a surviving spouse or civil partner after a death is a separate matter.

Is giving money to a spouse or civil partner for their ISA a tax matter?

It can be. This guide does not set out the tax treatment of gifts between spouses or civil partners, and it can depend on individual circumstances. HMRC or a regulated financial adviser can confirm the position for your case.

Do unmarried partners have the same ISA allowance rules?

The gov.uk pages read for this guide give the limit without distinguishing married couples from other adults. The additional permitted subscription after a death, however, relates specifically to a spouse or civil partner.

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This guide does not constitute financial advice. Your personal situation, tax position, and savings goals may mean different strategies are appropriate. Consider speaking to a regulated financial adviser if you are uncertain.