How Couples Shelter GBP 40,000 a Year Using Two ISAs (2026/27)

ISAs are deliberately individual: you cannot hold one jointly and you cannot share your allowance. But that individual nature is exactly what lets a couple double up. Each spouse or civil partner has their own GBP 20,000 ISA allowance for 2026/27, so between two people you can shelter GBP 40,000 a year completely free of UK tax.

The rules that make it work

Three rules combine neatly:

• Each adult gets a GBP 20,000 ISA allowance per tax year. Allowances cannot be transferred or shared, but two people simply have two of them.
• Transfers between spouses and civil partners are exempt from Capital Gains Tax and Inheritance Tax, so moving money or assets between you to fund the ISAs has no tax cost.
• ISAs must be in one person's name. So the practical method is to gift money to your partner, who then subscribes to their own ISA.

You cannot pay into your spouse's ISA on their behalf, but you can give them the cash and they pay it in. The end result is the same household pot, tax sheltered twice over.

Worked example

Tom and Priya have GBP 40,000 of savings to invest for 2026/27. Tom is a higher-rate taxpayer; Priya is a basic-rate taxpayer.

• Tom pays GBP 20,000 into his stocks and shares ISA.
• Tom gifts Priya GBP 20,000 (a tax-free interspousal transfer).
• Priya pays that GBP 20,000 into her own stocks and shares ISA.

The whole GBP 40,000 is now sheltered. Future dividends and gains on both ISAs are tax free. Had they instead left GBP 20,000 in a taxable account in Tom's name, dividends above the GBP 500 allowance would be taxed at 35.75% and gains above GBP 3,000 at 24%.

Beyond the ISA: spreading allowances

The same interspousal exemption lets couples use both partners' wider allowances on any money that does not fit in the ISAs:

• Two dividend allowances of GBP 500 each (GBP 1,000 combined) on taxable holdings.
• Two CGT annual exempt amounts of GBP 3,000 each (GBP 6,000 combined).
• Two personal savings allowances on interest.
• Holding income-producing assets in the lower earner's name, where dividend tax is 10.75% rather than 35.75%.

For a couple where one is a higher-rate taxpayer and the other is basic rate or a non-earner, shifting taxable investments to the lower earner can cut the household tax bill substantially, on top of filling both ISAs.

Practical points to watch

• Gifts to a spouse are genuine: legally the money becomes theirs. Only do this if you are comfortable with that.
• Keep each ISA within GBP 20,000 a year; paying into more than one ISA of the same type in a year used to be barred, though multiple subscriptions are now more flexible. Confirm current rules with your provider.
• Junior ISAs add GBP 9,000 per child if you have children, a separate allowance again.

For couples, the headline is simple: two ISAs, GBP 40,000 a year, zero UK tax on the growth.

To see how much tax you save by sheltering investments and shifting income to a lower-earning spouse, use the CalcHub dividend tax and capital gains tax calculators, and confirm ISA and spousal transfer rules on gov.uk.