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Five Common ISA Mistakes Costing You Money Before April Deadline

Five ISA mistakes that could be costing you money ahead of April deadline

With the new tax year just weeks away, now is the perfect time to check whether you're making the most of your ISA. For many UK savers, Individual Savings Accounts remain one of the smartest ways to protect their money from tax — but surprisingly, many people aren't using them properly.

Here's what you need to know before your ISA allowance resets on 6 April 2026.

**Why ISAs matter right now**

Every adult can save or invest up to £20,000 per tax year in an ISA completely tax-free. Any interest, dividends or profits you earn stay yours forever — HMRC doesn't take a cut. In an era when more savings are falling into the tax net, that protection is increasingly valuable.

**Five costly mistakes to avoid**

**1. Not using your full allowance.** Your £20,000 limit resets every April. If you don't use it, you lose it — you can't carry it forward. Even small regular deposits add up over time.

**2. Leaving money in a low-interest account.** Don't assume your ISA interest rate is the best available. Shop around and switch if needed.

**3. Only using a Cash ISA.** While safe, cash alone may not keep pace with inflation. Consider mixing a Cash ISA with a Stocks & Shares ISA for long-term growth.

**4. Starting too late.** Compound growth works best over time. Even £50–£100 monthly can grow substantially if you start early.

**5. Not exploring different ISA types.** A Lifetime ISA can help with first-time home purchases or retirement, while a Stocks & Shares ISA offers growth potential for patient investors.

**What to do now**

Review your current ISA rates — is your bank paying competitive interest? Check whether you're using multiple ISA types to balance safety and growth. If investing feels daunting, start small with amounts you're comfortable with.

Don't let your allowance go to waste. Visit MoneyHelper (the government's free guidance service) or compare ISA rates at MoneySuperMarket or Martin Lewis's MoneySavingExpert to find the right account for your goals.

Source: Five ISA mistakes that could be costing you money ahead of April deadline

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