You can hold unlimited ISAs over your lifetime, but there is a strict limit on how much you can pay in each tax year and a couple of special-case rules.

Quick scoop

  • No cap on how many ISA accounts you can have in total.
  • In each tax year (6 April–5 April), you can only add up to £20,000 across all your adult ISAs combined.
  • From April 2024, you can pay into multiple ISAs of the same type in the same tax year (e.g. two cash ISAs), as long as you stay within the overall allowance.
  • Lifetime ISA is the main exception: you can only pay into one Lifetime ISA per tax year, up to £4,000 of that £20,000 allowance.

How many ISAs can you have?

You can have as many ISA accounts as you like open at the same time – there’s no legal maximum number. Old ISAs from previous years can stay open and still keep their tax-free status, even if you’re no longer paying into them.

Where limits do bite is how much new money you add each year, not how many accounts you hold.

How many ISAs can you pay into each year?

For the 2025/26 tax year, the standard adult ISA allowance is £20,000 in total. That £20,000 is shared across all your adult ISAs, not £20,000 per ISA.

You can, for example:

  • Put some money into a cash ISA
  • Some into a stocks & shares ISA
  • Some into an Innovative Finance ISA

…and split the £20,000 however you like between them.

Same-type ISAs (post-2024 rule change)

Since April 2024, you can:

  • Open and pay into more than one cash ISA in the same tax year.
  • Open and pay into more than one stocks & shares ISA in the same tax year.
  • Do the same with Innovative Finance ISAs.

Previously you could only subscribe to one of each main type per year, which is why many older forum posts still say you are restricted.

Special cases: LISA, Junior ISA, Help to Buy

Some ISA types still have extra quirks:

  • Lifetime ISA (LISA)
    • You can only pay into one LISA per tax year.
* Max contribution is £4,000 a year (this uses part of your £20,000 allowance).
  • Junior ISA (for under-18s)
    • Child can have one cash and one stocks & shares JISA, with its own annual limit separate from your adult allowance.
  • Help to Buy ISA (now closed to new applicants)
    • Existing ones can still be used but have monthly deposit caps rather than a big yearly allowance.

Simple example

Imagine you want to “use up” your allowance this year:

  • £8,000 into Cash ISA 1
  • £4,000 into Cash ISA 2 (better rate later in the year)
  • £4,000 into a Stocks & Shares ISA
  • £4,000 into a Lifetime ISA

That totals £20,000, so you’re fine – even though you’re using four separate ISAs and two of them are the same type.

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Wondering how many ISAs can you have in the UK? You can hold unlimited ISA accounts, but you can only pay up to £20,000 a year across them, with special rules for Lifetime and Junior ISAs.

Information gathered from public forums or data available on the internet and portrayed here.