Bed and ISA Explained: Using Your CGT Allowance to Shelter Gains in 2026/27

What Is Bed and ISA?

Bed and ISA is a tax planning strategy used by investors who hold shares, funds, or other assets in a general investment account (also called a taxable account or dealing account) and want to move them into a Stocks and Shares ISA.

The process is exactly what the name suggests: you "put your investment to bed" outside the ISA by selling it, then you "wake it up" inside the ISA by repurchasing it immediately using the same proceeds. The result is that the same investment now sits within a tax-free wrapper, where all future growth and income -- capital gains, dividends, and interest -- will be sheltered from UK tax permanently.

The term echoes the older "Bed and Breakfast" strategy, which involved selling an investment on the last trading day and repurchasing it the next morning to crystallise a capital gain (and reset the cost base) while maintaining the position. HMRC closed that loophole in 1998 by introducing the 30-day share matching rule. The Bed and ISA strategy is distinct and remains legitimate, but understanding the rules is essential.

Why Bed and ISA Matters

Every year that your investments sit outside an ISA, they are exposed to tax on dividends, interest, and any capital gains when you eventually sell. As your portfolio grows, this tax drag can become very significant.

The Bed and ISA strategy systematically transfers assets into the ISA environment using the annual ISA allowance, while also using the CGT annual exempt amount to shelter the gain on the disposal. Over several years, a disciplined Bed and ISA programme can move an entire portfolio into the ISA shelter.

The 2026/27 Numbers

• ISA annual allowance: GBP20,000
• CGT annual exempt amount: GBP3,000
• CGT rates on other assets (shares, funds): 10% (basic rate taxpayer), 20% (higher/additional rate taxpayer)

For a higher-rate taxpayer with GBP20,000 of ISA allowance to use and investments with GBP3,000 of embedded gain, a Bed and ISA produces no CGT liability (the entire gain is within the exempt amount) and successfully moves GBP20,000 into the tax-free environment.

How Bed and ISA Works Step by Step

Step 1: Identify What to Move

Review your general investment account and identify investments that:

• Have grown since purchase (embedded capital gain)
• Generate dividend or interest income that is currently taxable
• You intend to hold for the long term

Prioritise assets where the gain is close to (but does not exceed) GBP3,000, or where you have capital losses from earlier in the year to offset a larger gain.

Step 2: Calculate the Gain

The gain is the current value minus the original purchase price (cost base), minus any allowable costs (dealing fees, etc.).

Example: You bought a global equity fund for GBP15,000 three years ago. It is now worth GBP18,500. The gain is GBP3,500.

This GBP3,500 gain is GBP500 above the GBP3,000 exempt amount. As a higher-rate taxpayer, you would owe 20% x GBP500 = GBP100 in CGT. A relatively modest cost to shelter GBP18,500 in the ISA permanently.

Step 3: Sell the Investment

Sell the investment in your general investment account. The proceeds are now sitting as cash.

Step 4: Repurchase Inside the ISA

Immediately use up to GBP20,000 of the proceeds to subscribe to your ISA and repurchase the same (or similar) investment inside it.

If the total proceeds exceed GBP20,000 (i.e., you are selling more than the ISA allowance in a single year), the excess remains outside the ISA. You will need to do further Bed and ISA transactions in future tax years.

Step 5: Report the Gain

If the gain exceeds GBP3,000, you must report it to HMRC via Self Assessment and pay any CGT due. If it is within the exempt amount, no CGT report is required (though keeping records is good practice).

The 30-Day Rule: What You Need to Know

HMRC's share matching rules state that if you sell shares and buy back the identical shares within 30 days in a taxable account, the disposal is matched against the new acquisition for CGT purposes. This means the gain you thought you crystallised disappears -- you do not get the cost base reset you were planning for.

The good news for Bed and ISA: Buying inside an ISA is specifically not caught by the 30-day rule in the same way. HMRC treats the purchase inside the ISA as a separate transaction from a separate "person" (the ISA wrapper). The sale outside the ISA is therefore a valid disposal.

However, there are nuances. If you sell shares outside the ISA and then also buy the same shares outside the ISA within 30 days (perhaps by accident), the 30-day rule does apply to those external transactions. To avoid any ambiguity, ensure the repurchase is only inside the ISA.

Same-Day Risk: Bridging the Gap

One practical risk in Bed and ISA is market movement between the sale and repurchase. If you sell your fund at 9am and the market rises by 2% before you can reinvest, you buy back in at a higher price. You have effectively missed 2% of the upside.

Several platforms mitigate this by offering a "same-day" or "instantaneous" Bed and ISA service where the sale and ISA subscription happen simultaneously (or as close as settlement rules allow). Hargreaves Lansdown, AJ Bell, and Interactive Investor all offer versions of this. If you are moving a significant sum, it is worth checking whether your platform supports it.

Settlement timing also matters. Shares typically settle T+2 (two business days after the trade). The sale proceeds may not be technically available for two days, though most platforms will allow you to subscribe to your ISA immediately in anticipation.

Maximising the Strategy Over Multiple Years

The GBP20,000 annual ISA allowance is a hard limit. If you have GBP200,000 in a general investment account, you cannot move it all in one year. But with a disciplined annual Bed and ISA programme, you can move the entire portfolio over ten years.

Plan each year to:

• Use GBP20,000 of ISA allowance (or as close as possible)
• Crystallise gains up to the GBP3,000 CGT exempt amount where the gain is embedded
• Use any capital losses from the current or previous years to offset gains on disposals above GBP3,000

If you have a partner who also has a GBP20,000 ISA allowance and a GBP3,000 CGT exempt amount, you can collectively shelter GBP40,000 per year into ISAs and use GBP6,000 of total exempt amount, significantly accelerating the process.

Using Losses to Enhance Bed and ISA

If some of your investments have fallen in value since purchase, they carry embedded capital losses. You can use Bed and ISA on these too -- sell them to crystallise the loss, subscribe to the ISA with the proceeds, and repurchase inside.

The crystallised loss can then be offset against gains elsewhere in the year (including gains on other Bed and ISA disposals). This lets you move assets with larger embedded gains into the ISA without a net CGT liability.

Example: You have two funds in a taxable account.

• Fund A: GBP10,000 gain
• Fund B: GBP8,000 loss

Selling both crystallises a net gain of GBP2,000, which is within the GBP3,000 exempt amount. You move GBP20,000 (combined proceeds) into the ISA with zero CGT. You have effectively used the exempt amount efficiently and sheltered more in the ISA per year than the GBP3,000 limit would otherwise allow.

Bed and ISA vs Other ISA Contribution Strategies

Some investors wonder whether they should simply make new cash contributions to an ISA rather than doing a Bed and ISA. The answer depends on your circumstances:

• If you have cash available: Simply subscribing cash to an ISA and buying investments inside it is simpler and avoids the CGT disposal. Bed and ISA is for when you already have investments outside the ISA.
• If your savings are tied up in investments: Bed and ISA is the right mechanism, since you do not have free cash to subscribe.
• If you have large embedded gains: A careful phased approach over multiple years minimises the annual CGT cost while maximising ISA sheltering.

Timing Bed and ISA Transactions

The best time to execute a Bed and ISA transaction is typically:

• Early in the tax year: This maximises the time your investments are inside the ISA and sheltered from tax in the current year.
• After a market fall: If the market has dipped, the embedded gain is smaller (or may have turned into a loss), making it cheaper to crystallise. Buying back inside the ISA at the lower price also gives more upside.
• Before dividends are paid: If a fund or share is about to pay a large dividend, moving it into the ISA before the dividend record date means the dividend is received tax-free inside the ISA.

Summary

Bed and ISA is a legitimate and widely used strategy for systematically moving taxable investments into the tax-free ISA environment. Over time, it shelters accumulated investments from CGT on future growth and from income tax on dividends and interest.

The 2026/27 CGT annual exempt amount of GBP3,000 is modest, so the strategy works best when combined with careful gain management, offsetting losses, and a multi-year programme. The ISA annual allowance of GBP20,000 caps annual progress, but couples can shelter GBP40,000 per year combined.

Same-day execution and careful attention to the 30-day rule are the main practical concerns. Most platforms make this straightforward, and for significant portfolios outside an ISA, the long-term tax savings from Bed and ISA can be very substantial.