The Three Investment Wrappers
Your investment returns are taxed by default. "Wrappers" are accounts that change that. Pick the wrong one and you pay tax you didn't have to. There are three main ones in the UK, and they suit different purposes.
ISA (Individual Savings Account)
Tax treatment: All growth, dividends, and interest are tax-free.
Annual allowance: £20,000 per tax year.
Access: Withdraw any time (Stocks & Shares ISA, note that selling investments may take a few days to settle).
Best for: Medium to long-term investing when you want tax-free growth and easy access.
Key rule: "Use it or lose it", unused allowance doesn't roll over.
The ISA is the cleanest wrapper available. No tax on the way in, no tax on growth, no tax on the way out. Most people should fill it before touching anything else.
SIPP (Self-Invested Personal Pension)
Tax treatment: Contributions receive tax relief (20% automatically, higher/additional rate via Self Assessment). Growth is tax-free. Withdrawals after 55 (57 from 2028): 25% tax-free lump sum, rest taxed as income.
Annual allowance: £60,000 or 100% of earnings (whichever is lower).
Access: Locked until age 55 (57 from 2028).
Best for: Long-term retirement savings. The tax relief makes it extremely efficient.
Key rule: The earlier you start, the more compound growth works in your favour.
The SIPP's headline benefit is the tax relief on contributions. A basic-rate taxpayer pays in £800 and gets £1,000 invested immediately. Higher-rate taxpayers can claim an extra 20% back through Self Assessment, making it even more powerful. The catch is the lock-in: you cannot touch this money before age 55 (rising to 57 in 2028), so only put in what you genuinely won't need before then.
GIA (General Investment Account)
Tax treatment: Dividends above the dividend allowance (£500 from the 2024/25 tax year onwards, reduced from £1,000) are taxed. Capital gains above £3,000 are taxed. Interest is taxed above your Personal Savings Allowance. Verify current allowances at gov.uk before relying on these figures.
Annual allowance: Unlimited.
Access: Withdraw any time.
Best for: Investing above your ISA allowance, or when you need flexibility without age restrictions.
The GIA has no annual limit, which is why it exists. If you have already used your £20,000 ISA allowance and you want to keep investing, the GIA is your only option. But you will pay tax on gains and dividends along the way, so it is the last wrapper to use, not the first.
Which Order?
For most UK investors, the priority is:
- . Workplace pension (if employer matches, free money)
- . ISA (£20,000 tax-free)
- . SIPP (if you want more retirement savings above employer pension)
- . GIA (for anything above ISA/SIPP limits)
This is not a rigid rule for everyone, but it holds for the majority of people in employment. The employer match on a workplace pension is the closest thing to free money that exists in personal finance. Walking away from it to invest elsewhere is almost always a mistake.
A Common Mistake
Many people keep large sums in a GIA when they haven't used their ISA allowance. This means paying unnecessary tax on growth year after year, for no reason.
If you have investments in a GIA, consider selling and re-buying inside an ISA, known as "Bed and ISA", to shelter future growth. There is a timing risk (you are briefly out of the market during settlement), but for most people the long-term tax saving is worth it. The one thing to check first: selling in the GIA crystallises any capital gain, which may itself trigger a tax bill depending on how much you have made and whether you have used your £3,000 annual CGT allowance.
Use CoreFi to track all your investment accounts in one place, regardless of wrapper type.