ISA Allowance 2026 UK: How Much Can You Save Tax-Free?

The ISA allowance for 2026 is £20,000 per tax year. This is the maximum you can pay into ISAs tax-free. Any growth or interest inside your ISAs is sheltered from income tax and capital gains tax.

What is the ISA allowance?

The ISA allowance is the total amount you can contribute across all your Individual Savings Accounts in a single UK tax year, which runs from 6 April to 5 April. For the 2025/26 tax year (and as of now, the 2026/27 tax year starting 6 April 2026), that limit is £20,000.

You can split this allowance across different ISA types: Cash ISAs, Stocks and Shares ISAs, Innovative Finance ISAs, and Lifetime ISAs. However, you can only pay into one of each type per tax year, and your total contributions must not exceed £20,000.

The Lifetime ISA has an additional annual limit of £4,000, which counts towards your overall £20,000 allowance. If you put £4,000 into a Lifetime ISA, you have £16,000 left for other ISAs that year.

Once money is inside an ISA, it grows free from UK income tax on interest or dividends and free from capital gains tax when you sell investments. This tax shelter remains in place for life, even after you stop contributing. You can learn more about how the allowance works in our guide to the ISA allowance explained.

Will the ISA allowance change in 2026?

As of early 2025, the government has not announced any planned changes to the ISA allowance for 2026. The £20,000 limit has been in place since the 2017/18 tax year and has remained frozen through multiple Budgets.

Historically, the allowance has increased over time. It was £15,240 in 2016/17, then jumped to £20,000 in 2017/18. The government reviews ISA rules periodically, and changes are typically announced in the Spring Budget (usually March) or Autumn Statement.

If there is a change for the 2026/27 tax year, it would likely be confirmed by March 2026 and take effect on 6 April 2026. Until then, you should plan on the basis of the current £20,000 limit, but check GOV.UK or HM Revenue and Customs announcements for any updates.

It is also possible the allowance could be reduced or adjusted in future years, particularly if fiscal policy shifts. Freezing the allowance while inflation rises effectively reduces its real value over time, so some observers expect eventual upward adjustments, but nothing is guaranteed.

How to use your ISA allowance strategically

You do not have to use your full allowance in one go. You can drip-feed money into ISAs throughout the tax year, which suits regular savers and can smooth out investment timing risk if you are buying index funds or shares.

Many people set up monthly standing orders to their ISA provider. For example, contributing roughly £1,667 per month gets you close to the £20,000 annual limit. This approach avoids the need to find a lump sum and can take advantage of pound-cost averaging in a Stocks and Shares ISA.

If you have a lump sum available early in the tax year, investing it straight away (often called "lump sum investing") historically outperforms drip-feeding over the long term, because your money is in the market longer. However, this depends on your risk tolerance and whether you are comfortable with short-term volatility.

You can also split your allowance across multiple ISA types. For instance, you might put £10,000 into a Stocks and Shares ISA for long-term growth and £10,000 into a Cash ISA for an emergency fund. Just remember you can only open or pay into one Cash ISA and one Stocks and Shares ISA per tax year, though you can transfer between providers without using up new allowance.

Lifetime ISAs are a special case. If you are under 40 and saving for a first home or retirement, the government adds a 25% bonus on contributions up to £4,000 per year. That is effectively free money, so it often makes sense to prioritise this if you are eligible, then use the remaining allowance elsewhere.

What happens if you exceed the ISA allowance?

If you accidentally pay in more than £20,000 across all your ISAs in a single tax year, HMRC will contact you to correct the overpayment. They will ask you to withdraw the excess amount, and that money will lose its tax-free status for the period it was held in the ISA.

You will not usually face a fine if the breach was accidental and you cooperate with HMRC. However, the excess contribution and any growth or interest it earned while in the ISA may be subject to income tax or capital gains tax.

If you realise you have gone over the limit, contact your ISA provider or HMRC as soon as possible. They can help you correct the mistake. Most providers have systems to prevent over-contributions, but errors can happen if you hold multiple ISAs or switch providers mid-year.

To avoid problems, keep a running total of your contributions across all ISAs during the tax year. Many providers show your year-to-date contributions on your account dashboard, but if you use multiple platforms, you need to track the combined total yourself.

Getting the most from your ISA allowance

Using your ISA allowance is only half the story. What you invest in matters just as much. Inside a Stocks and Shares ISA, you can hold funds, ETFs, individual shares, investment trusts, and bonds, depending on your platform.

For most UK investors, low-cost global index funds or ETFs are a sensible core holding. These spread risk across hundreds or thousands of companies worldwide and have annual charges typically below 0.25%. Popular choices include funds tracking the FTSE Global All Cap or MSCI World indices.

Cash ISAs make sense for money you need in the short term or as part of an emergency fund. Interest rates vary, so compare accounts on price comparison sites or MoneyHelper. Easy-access Cash ISAs offer flexibility; fixed-rate Cash ISAs can offer higher rates if you can lock money away for one to five years.

Avoid holding cash long-term in a Stocks and Shares ISA unless you are waiting to invest. Cash inside a Stocks and Shares ISA usually earns little or no interest, so you are wasting the tax shelter. Either invest the money or move it to a Cash ISA if you need safe access.

Remember that ISA allowances do not roll over. If you do not use your £20,000 this tax year, you lose it. The allowance resets on 6 April each year, so you get a fresh £20,000 (or whatever the limit is) to use again.

What to do when you max out your ISA allowance

If you have already used your full ISA allowance for the year and still have money to invest, you have several tax-efficient options. The next most common choice is a pension, either a workplace pension or a Self-Invested Personal Pension (SIPP). Pensions offer tax relief on contributions and shelter growth from tax, though you cannot access the money until age 55 (rising to 57 in 2028).

For higher and additional rate taxpayers, pensions are often more tax-efficient than ISAs because you get upfront relief at your marginal rate. Basic rate taxpayers get 20% relief automatically. The pension annual allowance is currently £60,000 per year (or 100% of your earnings, whichever is lower), giving you significant additional tax-advantaged space.

You can also invest in a standard general investment account (GIA) with a broker or platform. You will not get ISA tax benefits, but you do have a capital gains tax allowance (currently £3,000 per year as of 2024/25, though this can change) and a dividend allowance (currently £500) before you owe tax. For many people, a GIA is still worthwhile once ISA and pension allowances are used.

For more detail on these strategies, see our guide on tax-efficient investing beyond your ISA allowance.

Another option is to use your spouse or partner's ISA allowance if they have not used theirs. Each adult gets their own £20,000 allowance, so a couple can shelter £40,000 per year. You cannot transfer your allowance to someone else, but you can gift them money to invest in their own ISA (as long as the gift is genuinely theirs and you are not retaining control).

This is general information, not personalised financial advice. The value of investments can go down as well as up. Check FCA guidance or speak to a regulated adviser.