The main downsides of an ISA include potential,inflation-driven losses in cash ISAs, market risk in stocks and shares ISAs, and restricted access to funds. Specific disadvantages include penalties for early withdrawals on fixed-rate or Lifetime ISAs (LISA), limited contribution allowances, and, in some cases, lower interest rates compared to traditional savings accounts.
If you're not paying tax on your savings interest, cash ISAs have no benefit – so many should ditch them for higher-paying standard accounts. That's the message from MoneySavingExpert.com founder Martin Lewis in the third episode of the latest series of ITV's The Martin Lewis Money Show Live.
A Cash ISA is a great way to start. There is no income or capital gains tax to pay on the interest or returns your savings earn inside an ISA. In other words, you keep more of what you save. There are different types of Cash ISAs to suit different goals.
Pensions are particularly beneficial for higher-rate taxpayers who get a higher rate of tax relief on initial contributions. ISAs are much simpler and more flexible, but you are held back by the lower annual investment limit. In practice, a combination of ISAs and pensions will be suitable for most people.
Can I put more than £20,000 in an ISA? Technically, yes, but not all at once. There's no limit to how much money can be in an ISA. The ISA allowance limit applies to how much you can pay in during each tax year (6 April to 5 April the following year).
The UK government has announced significant changes to the tax treatment of cash held within stocks and shares Isas, targeting a loophole that could allow savers to bypass newly imposed caps on tax-free cash savings.
The 70/20/10 rule for money is a simple budgeting guideline that splits your after-tax income into three categories: 70% for Needs (essentials like rent, groceries, bills), 20% for Savings & Investments (emergency funds, retirement), and 10% for Debt Repayment & Donations (extra debt payments or giving). It balances immediate living costs with long-term financial security, helping you cover necessities while building wealth and paying off liabilities.
You can get around 7% interest on savings in the UK primarily through Regular Saver accounts, with top offers from Zopa (7.1% variable), First Direct (7% fixed), and the Co-operative Bank (7% variable), though these often require you to have their current account and limit monthly deposits, while Principality Building Society has offered rates near this (7.5%) on fixed-term savers, so check MoneySavingExpert and MoneyWeek for current deals.
The 7-3-2 rule is a financial strategy for wealth building, suggesting it takes 7 years to save your first major financial goal (like a crore), then accelerating to achieve the next goal in 3 years, and the third goal in just 2 years, leveraging compounding and disciplined, increased investments (like a 10% annual SIP hike). It highlights how returns compound faster over time, drastically reducing the time needed for subsequent wealth targets, emphasizing patience and consistent, growing contributions.
The HMRC document also said there were around 3,080 Isa accounts with a market value of £1 million-plus in 2022/23. It counted 30 cash Isa accounts with £500,000-plus in them and 38,680 stocks and shares accounts containing at least £500,000 in the tax year 2022/23. The figures were rounded to the nearest 10.
There are a number of factors you should consider before selecting a cash ISA.
3 months if your income is stable and you have a financial safety net. 6 months as a general rule, if you have children or large financial obligations, such as mortgages. 9 months if you're self-employed or have an irregular income stream.
Cash ISAs are tax-free. You won't pay tax on any interest you earn. At NatWest, we offer an instant access Cash ISA, and a Fixed Rate ISA with a set term. On the other hand, the interest you make on normal savings accounts may be taxed, if it's more than your Personal Savings Allowance.
Are ISAs still the best for rates? No, cash ISAs do not always pay the best interest rates, so it's worth shopping around. Historically, to beat an ISA you would need to find a net interest rate on a savings account that was higher than an ISA's gross interest rate.
This is called the ISA allowance. The annual ISA allowance for the 2025/2026 tax year is £20,000. This means you can save up to £20,000 across different types of ISAs, including: Cash ISAs: Save money with a fixed or variable interest rate.
What were the Cash ISA changes announced in the Autumn Budget? The Budget confirmed that the Cash ISA allowance is set to be cut from April 2027. For under-65s, the Cash ISA allowance will reduce from £20,000 to £12,000. For 65s, and older, the Cash ISA allowance will remain at £20,000.
HMRC's process for addressing excess payments
According to HMRC, 'We'll only take action after the end of the tax year, once we have the audit data in from the ISA companies. ' Providers are also given the task of calculating the gain or interest arising on any excess amount.
Individual Savings Accounts (ISAs)
The government sets a maximum amount that you can invest in ISAs. Until 2031 the annual limit is £20,000. You pay no Income Tax on the interest or dividends you earn within an ISA and any profits from investments are free of Capital Gains Tax.