The Tax Free Cash ISA Allowance remains one of the most useful personal savings allowances available to UK savers, business owners, startup founders and directors who want to keep interest away from Income Tax.
For the 2026/27 tax year, which runs from 6 April 2026 to 5 April 2027, the overall ISA allowance remains £20,000 per person. An eligible saver can currently put the entire £20,000 into Cash ISAs or divide it between different ISA types.
However, this is now a particularly important tax year because the rules will change from 6 April 2027.
From the 2027/28 tax year, people under 65 will normally be limited to £12,000 of new Cash ISA contributions each year, although the overall ISA allowance will remain £20,000. People aged 65 or over will continue to have a £20,000 Cash ISA limit.
For founders, directors and entrepreneurs, the distinction is worth understanding properly. A Cash ISA is not a business savings account and company money cannot simply be moved into one while remaining company money. But once earnings, salary, dividends or other funds legitimately become personal money, an ISA can form an important part of personal cash and wealth planning.
What Is the Tax Free Cash ISA Allowance in 2026/27?
The Cash ISA allowance determines how much new money can be subscribed to Cash ISAs during a tax year while remaining inside the ISA tax wrapper.
For 2026/27:
| ISA Rule | 2026/27 Position |
| Overall adult ISA allowance | £20,000 |
| Maximum Cash ISA contribution | Up to £20,000 |
| Stocks and Shares ISA | Up to £20,000, subject to overall limit |
| Innovative Finance ISA | Up to £20,000, subject to overall limit |
| Lifetime ISA | £4,000, forming part of the £20,000 overall allowance |
| Junior ISA | £9,000, separate from an adult’s ISA allowance |
| Tax-year deadline | 5 April 2027 |
Someone could therefore put £20,000 into Cash ISAs and nothing into another ISA.
Alternatively, they could put £10,000 into Cash ISAs and £10,000 into a Stocks and Shares ISA.
Another saver could contribute £4,000 to a Lifetime ISA, £8,000 to Cash ISAs and £8,000 to a Stocks and Shares ISA.
The important rule is that total new subscriptions to adult ISAs cannot normally exceed £20,000 during the tax year.
Unused allowance cannot be carried forward. If only £12,000 of the £20,000 allowance has been used by 5 April 2027, the remaining £8,000 does not increase the following year’s allowance.
What Changes to the Cash ISA Allowance From April 2027?
This is where the existing Cash ISA landscape changes significantly.
From 6 April 2027, the annual Cash ISA limit will become:
| Saver | Cash ISA Limit From 2027/28 | Overall ISA Limit |
| Under 65 | £12,000 | £20,000 |
| 65 or over | £20,000 | £20,000 |
This does not mean the overall ISA allowance is being reduced to £12,000.
For someone under 65, it means only £12,000 of the £20,000 overall allowance can be placed into Cash ISAs. The remaining £8,000 could potentially be used for eligible non-cash ISAs.
This is significantly different from the early suggestions that the Cash ISA limit could fall to £4,000. Those proposals are now outdated.
The confirmed figure is £12,000 for under-65s from 6 April 2027.
What Happens to Money Already in a Cash ISA?
Existing Cash ISA savings do not suddenly become taxable when the new £12,000 limit begins.
This is an important distinction.
The allowance limits new subscriptions, rather than the total amount a person is allowed to hold inside Cash ISAs.
Someone who has built a £100,000 Cash ISA balance over several years does not have to reduce it to £12,000.
Likewise, an individual could potentially contribute up to £20,000 during 2026/27 and keep that money inside the ISA after April 2027.
There is no general £20,000 or £12,000 maximum on the total value a Cash ISA can eventually reach. The restrictions concern how much qualifying new money can be added during individual tax years.
For savers with substantial cash reserves, this makes 5 April 2027 an important planning deadline, because 2026/27 is the final tax year under the announced rules in which an under-65 saver can put the full £20,000 annual allowance into cash.
What If You Turn 65 During the 2027/28 Tax Year?
The government has also clarified an issue that was previously uncertain.
The higher £20,000 Cash ISA entitlement will apply from the beginning of the tax year in which a person turns 65.
For example, someone who turns 65 in December 2027 will be treated as qualifying for the higher Cash ISA limit from the beginning of the 2027/28 tax year on 6 April 2027.
This is particularly relevant for people approaching retirement who prefer the certainty of cash savings rather than increasing their exposure to equity markets.
Can You Pay Into More Than One Cash ISA?
Yes. One of the most important corrections to older ISA guidance is that savers are no longer restricted to paying into only one Cash ISA during a tax year.
Under the current rules, someone could put:
- £5,000 into one easy-access Cash ISA;
- £10,000 into a one-year fixed Cash ISA; and
- £5,000 into another Cash ISA.
That would use the full £20,000 allowance for 2026/27.
The ability to use multiple accounts can be useful when dividing money between emergency savings and fixed-term deposits.
The important exception is the Lifetime ISA, where subscriptions are still restricted to one Lifetime ISA in a tax year and the separate £4,000 LISA contribution limit applies.
Why Is Cash ISA Interest Tax Free?
Interest earned inside a Cash ISA is generally free from UK Income Tax.
It also does not use the saver’s Personal Savings Allowance.
For 2026/27, the Personal Savings Allowance remains:
| Tax Position | Personal Savings Allowance |
| Basic-rate taxpayer | £1,000 |
| Higher-rate taxpayer | £500 |
| Additional-rate taxpayer | £0 |
There is also a separate starting rate for savings that can provide up to £5,000 of savings interest at 0% for people with sufficiently low levels of other taxable income.
This means a Cash ISA will not always immediately save tax.
A basic-rate taxpayer with only a modest amount of savings interest could already be fully covered by the Personal Savings Allowance.
However, the longer-term value of an ISA becomes clearer as savings balances and interest accumulate.
Example of the Tax Difference
Suppose someone has £20,000 earning 4.5%.
That produces approximately £900 of annual interest.
A basic-rate taxpayer with no other taxable savings interest could potentially receive the £900 without tax because it falls within the £1,000 Personal Savings Allowance.
A higher-rate taxpayer only has a £500 Personal Savings Allowance. Assuming no other savings interest, £400 would therefore remain above the allowance. At a 40% savings tax rate, that could create approximately £160 of Income Tax.
Inside a Cash ISA, the £900 interest remains sheltered from Income Tax.
As balances increase, that difference can become considerably larger.
Is a Cash ISA Always Better Than a Normal Savings Account?
No. This is one area where savers can make the wrong decision by focusing only on the words “tax free”.
The correct comparison is normally the net return after tax, not simply whether an account carries an ISA label.
Imagine a normal savings account pays 5% while a Cash ISA pays 4%.
If a saver remains within their Personal Savings Allowance, the ordinary account could leave them with more money despite not being an ISA.
But a higher-rate taxpayer who has already exhausted their £500 Personal Savings Allowance may find the Cash ISA significantly more attractive.
This is why founders and higher earners should look at their total financial position rather than considering one account in isolation.
What Are Cash ISA Rates Like in October 2026?
Cash ISA rates remain competitive, although offers can change quickly.
Around early October 2026, leading easy-access deals were approximately 4.6% AER, while some longer fixed-rate products were offering rates around 5% and, in certain cases, above 5%.
The highest headline rate should not automatically determine which account to choose.
Some market-leading easy-access deals include temporary introductory bonuses. When the bonus expires, the underlying rate can drop materially.
A saver should therefore compare:
- AER;
- whether the rate is fixed or variable;
- introductory bonus periods;
- minimum deposits;
- withdrawal restrictions;
- early-access penalties;
- whether ISA transfers are accepted;
- whether the account is flexible; and
- whether the provider has appropriate FSCS protection.
Someone maintaining an emergency fund may value instant access more highly than an extra fraction of a percentage point.
By contrast, money that is unlikely to be needed for several years may be more suitable for a fixed term, provided the withdrawal conditions are fully understood.
How Much Cash ISA Money Is Protected by the FSCS?
There has also been a significant update to savings protection.
Since 1 December 2025, the standard Financial Services Compensation Scheme deposit protection limit has been £120,000 per eligible person, per UK-authorised firm.
Previously, the standard limit was £85,000.
That does not necessarily mean £120,000 is protected separately at every banking brand.
Several banks can operate under the same banking licence. If two brands share one authorised institution, balances across those brands may need to be combined when calculating FSCS protection.
This matters increasingly for long-term Cash ISA users whose accumulated balances can substantially exceed a single year’s allowance.
What Is a Flexible Cash ISA?
A flexible ISA allows eligible withdrawals to be replaced during the same tax year without necessarily using the annual allowance again.
For example, imagine £20,000 has been contributed to a flexible Cash ISA.
If £5,000 is withdrawn and the ISA’s flexibility rules permit replacement, that £5,000 can generally be returned within the same tax year without the replacement being treated as an additional £5,000 ISA subscription.
A non-flexible Cash ISA works differently. Once the annual allowance has been used, withdrawing money generally does not restore that allowance.
Flexibility is determined by the provider’s product terms, so savers should never assume every easy-access ISA is automatically flexible.
How Do Cash ISA Transfers Work in 2026?
ISA transfers allow tax-protected money to move between eligible ISA accounts without first being withdrawn into an ordinary bank account.
Currently, a Cash ISA can generally be transferred between providers, and transfers can involve current-year or previous-year ISA money.
The important point is to use the new provider’s formal ISA transfer process.
Simply withdrawing the balance and sending the money yourself can cause the payment to be treated as a new subscription and may use available allowance.
Cash ISA-to-Cash ISA transfers should normally complete within 15 working days, while transfers involving other ISA types should generally take no more than 30 calendar days.
Providers can still impose product-specific restrictions or early-withdrawal charges.
What Will Change for ISA Transfers From April 2027?
The 2027 reform introduces another major change that is often overlooked.
From 6 April 2027, transfers from non-cash ISAs into Cash ISAs will generally no longer be permitted under the new rules.
Cash ISA money will still be able to move into non-cash ISAs.
The restriction is designed to prevent an under-65 saver from putting £20,000 into an investment ISA and immediately moving more than the permitted £12,000 into cash.
The restriction will be lifted from the tax year in which an individual reaches 65.
This makes future ISA asset allocation more important because moving from cash into investments will remain possible, while moving the same money back into a Cash ISA will become more restricted.
What Is the 22% Charge on Cash Held in Stocks and Shares ISAs?
Another important reform will take effect from April 2027.
Some Stocks and Shares ISAs allow investors to keep uninvested cash inside the account.
Without additional rules, someone could potentially try to avoid the £12,000 Cash ISA limit by subscribing £20,000 to a Stocks and Shares ISA and simply leaving the money sitting in cash.
To discourage that behaviour, a flat 22% charge will apply to interest or qualifying alternative-finance returns paid on cash held inside non-cash ISAs.
The ISA manager will be responsible for the charge rather than the investor having to declare the ISA interest personally to HMRC.
The Personal Savings Allowance will not apply to this ISA charge.
The government is also restricting portfolios designed entirely around cash-like investments. Money market funds can remain part of a diversified non-cash ISA portfolio, but a portfolio consisting entirely of those cash-like assets will not meet the new approach.
Conventional shares, investment funds, investment trusts, ETFs, corporate bonds and government bonds such as gilts are not being treated as cash-like assets for this purpose.
Should You Put £20,000 Into a Cash ISA Before April 2027?
For someone under 65 who already plans to keep a substantial amount of money in cash, 2026/27 has unusual strategic importance.
It is the final tax year under the announced rules where the whole £20,000 allowance can be placed into Cash ISAs.
But that does not mean everyone should rush to put £20,000 into cash.
Before doing so, consider:
- Whether enough accessible cash is already available for emergencies.
- Whether expensive debt should be repaid first.
- Whether the money will be needed in the short term.
- Whether a normal savings account produces a better net return.
- Whether part of the money has a long investment horizon.
- Whether pension contributions offer greater benefits for retirement planning.
- Whether locking money away could create cash-flow problems.
For founders comparing savings with longer-term assets, considering where to invest money to get good returns can help separate short-term capital preservation from genuine long-term investment decisions.
What Should Startup Founders and Business Owners Know About Cash ISAs?
A Cash ISA is a personal savings product.
It is not an alternative place to hold company working capital.
If a limited company has £100,000 sitting in its business account, the director cannot simply move £20,000 into a personal Cash ISA and continue treating it as company money.
Funds first need to become the individual’s money legitimately, potentially through salary, dividends, repayment of money owed by the company or another valid mechanism.
Each route can have different tax consequences.
That is why founders should consider personal ISA planning separately from company obligations such as profits, distributions and Corporation Tax.
From a business-owner perspective, we see the ISA as one component of a much wider financial structure:
Company cash → personal extraction strategy → emergency reserves → ISA → pension → longer-term investments.
The most tax-efficient route is not necessarily the one that puts the largest possible amount into a Cash ISA immediately.
For example, a founder preparing for a business slowdown may place a greater value on liquidity. Someone who has completed an exit may instead be concerned about managing a much larger personal cash position across ISA allowances, investments and pensions.
Retirement planning may also need to be reviewed alongside forthcoming pension inheritance tax changes, particularly for founders whose personal wealth is spread across pensions, company shares, investments and cash.
Cash ISA vs Stocks and Shares ISA
The choice should normally be driven by when the money is needed and how much risk the saver can tolerate.
| Feature | Cash ISA | Stocks and Shares ISA |
| Capital volatility | Normally very low | Value can rise or fall |
| Return | Interest | Investment growth, income or losses |
| Typical use | Short and medium-term savings | Longer-term investing |
| Tax treatment | Interest tax free | Qualifying gains and income sheltered |
| Access | Depends on account | Investments normally need to be sold |
| FSCS treatment | Deposit protection may apply | Different investment-protection rules apply |
Cash should not automatically be viewed as inferior to investing.
Founders often hold larger-than-average emergency reserves because their personal income may be connected to the performance of one company.
Six or twelve months of personal expenditure in accessible cash may therefore be more valuable to an entrepreneur than to someone receiving a highly predictable salary.
Equally, holding excessive cash for decades can expose wealth to inflation and opportunity cost.
The correct balance depends on the purpose of the money.
Can Couples Get a £40,000 ISA Allowance?
Yes, effectively, provided both individuals are separately eligible.
ISAs cannot be held jointly.
Each person has their own £20,000 allowance for 2026/27, meaning a couple could potentially shelter £40,000 of new money between them during the tax year.
From April 2027, two people under 65 would each have a £12,000 Cash ISA limit, potentially allowing £24,000 of combined new Cash ISA subscriptions while retaining £40,000 of overall combined ISA capacity.
Ownership matters, however. Money contributed to one person’s ISA legally belongs inside that individual’s account.
What Happens If You Exceed the ISA Allowance?
People using several ISA providers need to keep track of their combined subscriptions.
A bank cannot necessarily see what has been paid into an ISA held with another provider.
If the overall allowance is exceeded accidentally, it is generally better not to try to correct the situation manually by closing accounts or withdrawing arbitrary amounts.
HMRC may identify invalid subscriptions through ISA reporting and determine the appropriate correction.
Careful record keeping becomes particularly useful now that savers can subscribe to multiple ISAs of the same type.
Is the Cash ISA Still Worth Using in 2026?
For many people, yes.
The combination of relatively strong savings rates, frozen tax thresholds and a Personal Savings Allowance of only £500 for higher-rate taxpayers makes tax-free savings increasingly valuable as balances grow.
Its value is particularly clear for:
- higher and additional-rate taxpayers;
- people who have already exhausted their savings allowances;
- savers building substantial long-term cash balances;
- retirees seeking predictable income;
- founders keeping personal emergency reserves;
- people expecting their future savings interest to increase; and
- savers who want to preserve tax protection over many years.
A person does not need an immediate tax bill for an ISA to have value.
Money placed into the ISA today can continue earning tax-free interest in future years without using another year’s allowance simply to keep the existing balance sheltered.
That cumulative protection is one of the biggest advantages of using ISA allowances consistently.
What Should Savers Do Before 5 April 2027?
For under-65 savers with substantial cash, the 2026/27 tax year deserves more attention than an ordinary ISA year.
The £20,000 overall allowance is still available, and the entire amount can still be held in Cash ISAs until 5 April 2027.
From the following day, the £12,000 cash restriction is scheduled to begin.
That creates a practical window for people who already intend to keep money in cash.
However, decisions should still be based on personal goals rather than simply maximising an allowance because it exists.
For startup founders especially, liquidity has economic value. Money required for tax payments, household expenditure, a future business investment or an uncertain income period should not be locked away simply to obtain a marginally higher savings rate.
Conclusion
The Tax Free Cash ISA Allowance for 2026/27 is £20,000, and eligible adults can currently place the entire amount into Cash ISAs if they choose.
The biggest change arrives on 6 April 2027, when the annual Cash ISA limit falls to £12,000 for under-65s, while people aged 65 and over retain the £20,000 cash limit. The total ISA allowance remains £20,000.
The reform also goes considerably further than simply changing one number. New restrictions will affect transfers from non-cash ISAs into Cash ISAs, while a 22% charge will apply to interest on cash held inside non-cash ISAs. Existing Cash ISA savings remain protected, and the new limit applies to future subscriptions rather than forcing savers to reduce balances they have already accumulated.
For founders, directors and entrepreneurs, a Cash ISA works best when viewed as part of personal financial planning rather than as a substitute for business banking or investment strategy.
Using the allowance can be valuable, but the strongest approach is usually to balance tax efficiency with liquidity, interest rates, risk, business cash-flow needs and long-term wealth objectives.
FAQs
How Much Can I Put Into a Cash Isa in 2026/27?
You can put up to £20,000 into Cash ISAs during 2026/27, provided your total subscriptions across adult ISAs do not exceed £20,000.
When Does the £12,000 Cash Isa Limit Start?
The new £12,000 limit for people under 65 is scheduled to start on 6 April 2027.
Will My Existing Cash Isa Balance Be Reduced?
No. The new limit applies to new annual contributions. Money already held inside Cash ISAs can remain there.
Can I Have Two Cash Isas in the Same Tax Year?
Yes. Current rules allow contributions to multiple Cash ISAs, provided the combined subscriptions remain within your applicable annual ISA limits.
Do I Pay Tax When Withdrawing Money From a Cash Isa?
No Income Tax is normally charged simply because money is withdrawn from a Cash ISA, although fixed-term products may impose provider penalties or loss of interest.
Is Cash Isa Interest Part of the Personal Savings Allowance?
No. Cash ISA interest is sheltered inside the ISA and does not use your Personal Savings Allowance.
Can a Limited Company Open a Cash Isa?
No. Adult ISAs are personal accounts for eligible individuals rather than company savings vehicles.
Can I Transfer an Old Cash Isa Without Using This Year’s Allowance?
A formal ISA transfer generally does not count as a new subscription. Always use the receiving provider’s ISA transfer process rather than withdrawing the money yourself.
How Much Fscs Protection Applies to a Cash Isa?
Eligible deposits with UK-authorised institutions can be protected up to £120,000 per eligible person, per authorised firm, subject to FSCS rules.
What Happens to the Remaining £8,000 After April 2027?
An under-65 saver will still have a £20,000 overall ISA allowance. After using the £12,000 Cash ISA limit, up to £8,000 of remaining allowance could potentially be allocated to eligible non-cash ISAs.
