2027 ISA Tax Changes
- Thowsif Mukit
- Jun 8
- 4 min read
ISAs are not becoming taxable in the usual sense. The ISA wrapper still protects eligible interest, income and gains, but from 6 April 2027 the government plans to change how some cash held in ISAs is treated.
For savers, landlords, sole traders and company directors, the key point is not to panic. The practical step is to understand where your cash sits, what it is for, and whether it belongs in a Cash ISA, investment ISA, ordinary savings account or business reserve.
2027 Isa Tax Changes
The 2027 ISA tax changes are not the same as the government removing the ISA tax wrapper.
For the tax year 6 April 2026 to 5 April 2027, the ISA allowance remains £20,000. This can be split across the permitted ISA types, including Cash ISAs, Stocks and Shares ISAs, Innovative Finance ISAs and Lifetime ISAs.
Under the existing ISA rules, you do not pay tax on interest on cash held in an ISA. You also do not pay tax on income or capital gains from investments held in an ISA. If you complete a Self Assessment tax return, ISA interest, ISA income and ISA gains do not normally need to be included.
The main change from 6 April 2027 is the treatment of cash within the ISA system.
For people under 65, the Cash ISA limit will reduce to £12,000. The overall ISA allowance will remain £20,000. This means a saver under 65 could still use the full £20,000 allowance, but not all of it as Cash ISA savings.
To prevent savers placing £20,000 of cash into a Stocks and Shares ISA or Innovative Finance ISA instead, the government is introducing anti avoidance style rules. Interest paid on cash held inside a non Cash ISA will be subject to a 22% charge. A non Cash ISA will also not be allowed to consist entirely of cash like investments. The government has said this will initially focus on Money Market Funds.
Transfers will also be restricted. From 6 April 2027, transfers from non Cash ISAs into Cash ISAs will not be permitted for many savers. Transfers from Cash ISAs into non Cash ISAs will still be allowed.
For people aged 65 and over, the Cash ISA limit will remain £20,000. They will also have more flexibility on transfers into Cash ISAs. However, the 22% charge on interest from cash held in non Cash ISAs will still apply.
So the headline is this: ISAs are not becoming taxable across the board, but holding cash in the wrong ISA type could become less efficient from 6 April 2027.
How it impacts you
For everyday savers, the main issue is the reduced Cash ISA limit from 6 April 2027. Anyone under 65 who usually puts most of their savings into Cash ISAs may need to rethink how they use the £20,000 overall allowance.
This could affect people who prefer low risk savings. It may also affect small business owners who hold surplus personal cash after taking salary, dividends or profits from a business. Cash savings may still be sensible, but the structure will matter more.
For landlords and property owners, the changes may sit alongside wider tax planning. Rental profits, mortgage interest restrictions, repairs, capital expenditure and future Capital Gains Tax exposure can already make the personal tax position more complicated. ISA planning does not replace Property Accounting, but it forms part of the wider financial picture.
For sole traders and contractors, the key point is liquidity. Many people keep cash aside for Self Assessment, VAT Returns or future business costs. That cash needs to be accessible and clearly separated from longer term savings. A Cash ISA may still be useful, but the lower limit from 6 April 2027 means some savers will need a second home for excess cash.
For company directors, the changes may also interact with dividend planning. If profits are extracted from a limited company and then saved personally, the tax position does not end when the dividend is paid. The next step is deciding where the net cash should be held. That could involve Cash ISAs, investment ISAs, pensions, ordinary savings accounts or retaining cash in the company.
There is also an administrative point. ISA income may not need to go on a Self Assessment tax return, but ordinary savings interest outside an ISA can still matter. It may affect tax calculations, payments on account and the information needed for an accurate SA100 submission.
What you can do
Start by checking how much you currently hold in Cash ISAs, Stocks and Shares ISAs and ordinary savings accounts. The issue is not only how much you have saved. It is where the money is held and what purpose it serves.
Next, separate short term cash from long term savings. Money needed for tax bills, VAT, emergency costs or upcoming property expenses should not be treated the same way as money invested for several years. This is where simple bookkeeping and cash flow planning can help, especially for sole traders and landlords.
If you hold cash inside a Stocks and Shares ISA, review why it is there. A small cash balance for fees, timing or investment flexibility may still be normal. Holding large cash balances for a long period may become less efficient once the 22% charge applies from 6 April 2027.
Do not rush into investments purely because the Cash ISA rules are changing. Stocks and Shares ISAs involve investment risk. The right decision depends on your time horizon, risk tolerance and wider finances.
For business owners, review personal and business cash together. Clean bookkeeping, accurate Management Reporting and timely Self Assessment preparation make it easier to understand how much cash is needed for tax and how much could be saved or invested.
Ledgr Accountants can support clients by keeping records organised, preparing Self Assessment Tax Returns, reviewing property income, and helping business owners understand their cash flow more clearly. The aim is not to make savings decisions for you. It is to make sure your tax position and financial records are clear enough for sensible planning.
Thowsif Mukit
Commercial Manager
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