Bed and ISA: The Tax-Year-End Move That Could Save You Thousands

The mechanics are straightforward. You sell shares or funds in your general investment account (GIA), transfer the cash into your stocks and shares ISA, and rebuy the same holdings. Unlike the old "bed and breakfast" rules — where HMRC's 30-day matching rule would treat a repurchase within 30 days as if the sale never happened — buying back inside an ISA is explicitly carved out. The ISA purchase doesn't count as a repurchase for CGT purposes.

That's the crucial bit. You can sell BP shares in your GIA at 9am and buy them back in your ISA at 9:05am. No 30-day wait. No different fund needed. Same holding, different wrapper.

Some platforms — AJ Bell, Hargreaves Lansdown, Interactive Investor — offer a one-click "bed and ISA" tool that handles both legs automatically. Others require you to sell, wait for settlement (usually T+2 for shares, T+1 for funds), and then manually buy in the ISA. If you're doing this before 5 April, start now — settlement delays could push you past the deadline.

The Capital Gains Tax annual exempt amount has been gutted. It was £12,300 as recently as 2022/23, then £6,000, and now it's just £3,000. For a higher-rate taxpayer, gains above that threshold are taxed at 20% (or 24% on residential property). That means a £10,000 gain outside an ISA costs you £1,400 in CGT. Inside an ISA, it costs nothing.

The dividend allowance tells the same story: £2,000 in 2022/23, £1,000 in 2023/24, and just £500 since April 2024. A higher-rate taxpayer with £5,000 in annual dividend income outside an ISA pays £1,518.75 in dividend tax. Inside the wrapper? Zero.

Compound those savings over a decade and you're looking at tens of thousands of pounds — real money that stays in your portfolio rather than funding HMRC's next round of consultations.

If you tick any of these boxes, bed and ISA should be on your to-do list this week:

• You hold funds or shares in a GIA with unrealised gains. Even if the gains are below the £3,000 threshold now, they won't stay there if markets rise. Move them into the ISA while the headroom exists.
• You receive dividends outside an ISA. With only £500 of tax-free dividend income, even a modest FTSE 100 tracker paying 3.5% on £20,000 throws off £700 — already over the allowance.
• You have unused ISA allowance. The £20,000 annual limit resets on 6 April. You can split it across cash ISA and stocks and shares ISA, but any unused portion is gone forever.
• You're a higher or additional rate taxpayer. The tax drag on unsheltered investments is significantly worse at 40% or 45% income tax rates, with dividend rates of 33.75% and 39.35% respectively.

For a full overview of ISA types and rules, see our comprehensive ISA guide. If you're weighing up cash versus stocks and shares, our debate on cash ISA vs stocks and shares ISA lays out both sides.

Bed and ISA isn't risk-free. Here's what catches people out:

Settlement timing. Shares settle T+2, funds typically T+1 or same day. If you sell on 3 April and settlement doesn't clear until 7 April, the cash arrives in the new tax year and you've used your 2026/27 allowance instead of 2025/26. Work backwards from 5 April and give yourself a buffer.

Dealing costs. Two trades means two sets of commissions and potential spread costs. On a £20,000 bed and ISA, platform dealing charges of £10-12 per trade are trivial against the tax saved. But if you're moving £500, check the maths — it might not be worth it for tiny amounts.

Stamp duty on shares. UK-listed shares attract 0.5% stamp duty reserve tax on purchase. If you bed and ISA £20,000 of UK equities, that's £100 in stamp duty. Funds (OEICs and unit trusts) don't attract stamp duty, so they're cleaner to transfer.

Crystallising a gain you owe tax on. If your gains for the year already exceed £3,000, the bed and ISA sale adds to your CGT liability. You might still do it — the long-term tax saving outweighs the one-off hit — but go in with your eyes open. Use any available losses to offset.

For guidance on transferring existing ISAs between providers, that's a separate process from bed and ISA — don't confuse the two.

Related reading: savings guide, tax planning guide, pensions guide.

Say you hold £20,000 of a global equity fund in your GIA, bought for £15,000. The unrealised gain is £5,000. You're a higher-rate taxpayer.

Without bed and ISA: You eventually sell and pay 24% CGT on £5,000 minus your £3,000 allowance = £480. Plus, if the fund pays 2% annual income (£400/year), you're paying 33.75% dividend tax on any amount above your £500 allowance. Over ten years, assuming 7% annual growth, the total tax drag easily exceeds £3,000.

With bed and ISA now: You sell, crystallise the £5,000 gain. After the £3,000 annual exempt amount, you owe £480 in CGT this year. You rebuy inside your ISA. From this point forward: zero CGT on all future growth, zero dividend tax on all future income. Over ten years at 7% growth, your ISA pot reaches roughly £39,300 — all tax-free. The same pot outside the wrapper, after tax drag, might be worth £35,500.

That £3,800 difference is the cost of doing nothing. And it grows every year you leave investments outside the wrapper.

This article is for informational purposes only and does not constitute financial advice. You should seek independent financial advice before making any investment decisions.