Investors who built up holdings in a General Investment Account before fully using their ISA allowance often reach a point where they'd like to move that money into the tax-free shelter of an ISA. The mechanism for doing this — known as "bed and ISA" — is straightforward in principle, but it involves a genuine sale and repurchase of investments, with real tax and market timing implications worth understanding before proceeding.
What "bed and ISA" actually means
The term comes from an older practice called "bed and breakfasting" — selling an investment and buying it back shortly after, historically to crystallise a gain or loss for tax purposes. "Bed and ISA" applies the same basic idea specifically to moving assets from an unwrapped GIA into an ISA: the investor sells the holding in the GIA, and the resulting cash is used to buy back the same (or a similar) investment within an ISA, sheltering future growth from tax.
Many platforms offer this as a single, streamlined process — sometimes even executing the sale and repurchase on the same day, or as close together as market rules allow — rather than requiring the investor to manually sell, withdraw, and separately reinvest.
Why investors use this strategy
- To move existing GIA holdings into the ISA wrapper, where future gains and dividends will be free of tax
- To make use of an ISA allowance that would otherwise go unused that tax year, particularly for investors who have built up savings outside an ISA over time
- To simplify future tax reporting, since gains and dividends inside an ISA don't need to be declared to HMRC at all, unlike a GIA
The two things to weigh up before doing it
Capital Gains Tax on the sale
Selling an investment in a GIA is a disposal for CGT purposes, just like any other sale. If the holding has grown in value since it was bought, this sale could trigger a CGT liability, subject to the £3,000 annual exempt amount (2025/26) and the investor's own gains position for the year. This means "bed and ISA" isn't automatically free of tax cost — it needs to be weighed against the specific gain involved and how much of the annual exempt amount has already been used.
Being out of the market briefly
Because the strategy involves selling and then repurchasing, there is typically a short period where the money is out of the market — even if this is just a fraction of a trading day on some platforms. During this window, the investor isn't exposed to whatever the market does, for better or worse. This is usually a minor consideration for buy-and-hold, long-term investors, but it's worth being aware of, particularly around volatile periods.
A worked example
Suppose an investor holds £15,000 in a GIA, originally purchased for £11,000, giving an unrealised gain of £4,000. They have not used any of their £20,000 ISA allowance or their £3,000 CGT annual exempt amount so far this tax year, and want to move the holding into their ISA using bed and ISA.
On selling, the £4,000 gain exceeds the £3,000 annual exempt amount by £1,000, so £1,000 would be taxable at the investor's applicable CGT rate (18% or 24% depending on their tax band). The resulting £15,000 in proceeds is then used to subscribe to the ISA, using £15,000 of the £20,000 annual ISA allowance, with £5,000 of ISA allowance remaining for the rest of the tax year.
In this hypothetical example, a modest CGT bill was incurred to secure ongoing tax-free treatment on the investment going forward — a trade-off that many investors judge worthwhile, particularly for a holding they intend to keep for many more years, since the alternative is potentially larger, repeated CGT exposure on this holding every future time it's sold, for as long as it remains in the GIA.
Timing considerations around the tax year end
Because both the CGT annual exempt amount and the ISA allowance reset on 6 April, many investors consider carrying out a bed and ISA in the weeks leading up to the tax year deadline, to make use of the outgoing year's allowances before they're lost, or shortly after 6 April, to take advantage of a fresh set of allowances at the start of the new tax year. Leaving the decision until the very last days of the tax year risks platform processing delays around a period when many other investors are making similar year-end decisions, so planning a little in advance is generally more reliable than leaving it to the final days.
Spreading it over multiple tax years
For a large GIA holding with a substantial unrealised gain, some investors spread the bed and ISA process over several tax years, moving only part of the holding each year to make use of the annual CGT exempt amount without exceeding it and triggering a larger tax bill in a single year. This requires more patience but can reduce or eliminate the CGT cost of the transition altogether, depending on the size of the gain relative to the annual exempt amount.
Bed and ISA versus bed and SIPP
A related strategy, sometimes called "bed and SIPP," applies the same basic idea to moving GIA holdings into a pension rather than an ISA. The mechanics are similar — sell in the GIA, then use the proceeds to make a pension contribution — but a SIPP contribution also attracts tax relief on top of the CGT considerations, which can make the maths meaningfully different. However, pension contributions are locked away until at least the minimum pension access age, unlike ISA money which remains accessible at any time, so the two strategies suit different circumstances and time horizons.
| Feature | Bed and ISA | Bed and SIPP |
|---|---|---|
| Tax relief on the amount moved | None — ISA contributions come from already-taxed money | Yes, at the investor's marginal rate, subject to the annual allowance |
| Access to the money afterwards | Unrestricted, at any time | Locked until minimum pension access age |
| CGT on the initial sale | Applies in the same way to both | Applies in the same way to both |
| Annual limit on amount moved | £20,000 ISA allowance (shared across ISA types) | £60,000 pension annual allowance (or 100% of earnings if lower), plus any carry forward |
Choosing what to buy back
The investor doesn't have to repurchase the exact same fund inside the ISA — though many do, for simplicity and continuity of their existing strategy. Some investors use the opportunity to review their overall investment approach and select a different fund, if their circumstances or preferences have changed, while others prefer to keep the process as close as possible to a like-for-like switch.
Practical considerations
| Consideration | Detail |
|---|---|
| ISA allowance | The amount moved counts as a new ISA subscription, so it's limited by whatever remains of the £20,000 annual allowance |
| CGT position | Check current-year gains already realised, and the £3,000 annual exempt amount, before proceeding |
| Trading costs | Some platforms charge a dealing fee for the sale and/or repurchase — worth checking before committing to the process |
| Timing | Some platforms offer same-day bed and ISA; others may have a short delay between sale and repurchase |
Common mistakes to avoid
Forgetting the same-day and 30-day matching rules
Because of anti-avoidance rules governing how a sale is matched against subsequent purchases of the same holding, an investor attempting a same-day or near-immediate bed and ISA on the identical fund needs to understand that the repurchase inside the ISA is treated as a genuinely new, separate holding for ISA purposes, even though the same matching rules can affect how any remaining position in the GIA (if only partially moved) is treated for CGT purposes.
Triggering a larger CGT bill than necessary by moving everything in one go
An investor eager to shelter an entire large GIA holding in a single tax year may trigger a CGT bill considerably larger than if the same holding were moved gradually over two or more tax years, each making use of a fresh annual exempt amount. Weighing the benefit of getting everything into the ISA sooner against the cost of a larger, avoidable tax bill is worth doing deliberately rather than by default.
Ignoring dealing costs on both sides of the transaction
Some platforms charge a fee for both the sale and the repurchase, and on a large holding moved gradually over several years, these costs can accumulate. Checking a platform's specific charging structure for bed and ISA transactions before repeatedly using the strategy avoids an unwelcome cumulative cost.
Frequently asked questions
Does bed and ISA use up ISA allowance even if no CGT is triggered?
Yes — regardless of whether the sale in the GIA creates any taxable gain, the amount subsequently paid into the ISA still counts as a normal subscription against the £20,000 annual allowance, in exactly the same way as any other ISA contribution.
Is bed and ISA available for all types of holding?
Most mainstream funds, shares, and investment trusts held in a GIA can typically be moved this way, provided the same or an equivalent investment is available within the ISA. Some more specialist or illiquid holdings may not be supported by every platform's bed and ISA process, so it's worth checking before assuming the whole portfolio can be moved this way in one step.
Key takeaways
- Bed and ISA involves selling GIA holdings and using the proceeds to subscribe to an ISA, sheltering future growth from tax.
- The sale itself can trigger a Capital Gains Tax liability, subject to the £3,000 annual exempt amount (2025/26) and the investor's existing gains for the year.
- Being briefly out of the market during the sale-and-repurchase process is usually a minor consideration for long-term investors.
- Spreading a large transition across multiple tax years can help manage or reduce the CGT cost.
- Investors can repurchase the same fund or use the opportunity to review and change their investment choice inside the ISA.
- Always check current HMRC figures for the CGT annual exempt amount and rates, and confirm the specific process and any charges with your platform.