What is bed and ISA and how does it work?
Answered 17 March 2026
Based on the sources gathered, I can provide a partial answer about "bed and ISA." However, I should note that the available sources do not contain a dedicated explanation of "bed and ISA" as a named strategy. I can piece together the relevant components from the sources found.
Bed and ISA — What It Is and How It Works
"Bed and ISA" is an investment strategy where an investor sells investments held outside an ISA (typically in a general investment account) and uses the proceeds to subscribe to a stocks and shares ISA, then repurchases the same (or similar) investments inside the ISA wrapper. The goal is to shelter future gains and income from tax within the ISA's tax-free environment.
What the law says
The 30-day "bed and breakfast" matching rule (TCGA 1992, s.106A)
When shares are sold and the same class of shares is reacquired within 30 days, the disposal is matched against the reacquisition rather than the original holding — meaning no capital gain or loss is crystallised on the sale. Specifically, TCGA 1992 s.106A(5) provides:
"if within the period of thirty days after the disposal the person making it acquires securities of the same class, the securities disposed of shall be identified with securities acquired by him within that period, rather than with other securities"
This rule is the key obstacle to a straightforward "bed and breakfast" (sell and repurchase) strategy. However, bed and ISA sidesteps this rule because shares repurchased inside an ISA are held in a different capacity — and s.106A(3) provides that "where a person disposes of securities in one capacity, they shall not be identified under those provisions with any securities which he holds, or can dispose of, only in some other capacity". Shares held inside an ISA are held in a different capacity to those held outside, so the 30-day matching rule does not apply.
ISA tax exemptions
Once inside the ISA wrapper:
- Income from an ISA is exempt from Income Tax
- Capital gains on assets held within a valid ISA are exempt from Capital Gains Tax
ISA subscription limit
The amount that can be subscribed to an ISA is subject to an annual limit. ISAs were simplified from 1 July 2014, with equal limits for cash and investments. The proceeds from the sale must fit within the investor's remaining annual ISA allowance for the year.
HMRC guidance / practice
How the strategy works in practice
The HMRC guidance on AIM shares illustrates the mechanics directly:
"Existing owners of AIM shares need to sell these shares, transfer the proceeds to the ISA and then instruct the ISA manager to acquire the AIM shares."
This is precisely the bed and ISA process: sell outside → transfer cash proceeds → repurchase inside the ISA.
The 30-day rule does not block the repurchase inside an ISA
HMRC guidance confirms that the identification rules in s.106A apply to shares "held in the same capacity". Since ISA investments are held by the ISA manager on behalf of the investor in a distinct legal capacity, the repurchase inside the ISA within 30 days does not trigger the bed and breakfast matching rule — meaning the sale outside the ISA does crystallise a gain or loss as intended.
Key practical points:
- The investor sells shares/funds in their general investment account — this is a disposal for CGT purposes, crystallising any gain or loss.
- The sale proceeds (cash) are subscribed into a stocks and shares ISA, subject to the annual ISA allowance.
- The ISA manager repurchases the same investments inside the ISA.
- All future growth and income on those investments is sheltered from tax within the ISA.
Important constraint: Only investments eligible for a stocks and shares ISA can be repurchased inside it — for example, shares listed on a recognised stock exchange.
⚠️ Note: The available HMRC sources do not contain a dedicated "bed and ISA" guidance page. For comprehensive HMRC guidance on this strategy, you may wish to consult the HMRC Capital Gains Manual at CG51560 (bed and breakfast rules) and the ISA Managers' Guidance published on gov.uk (SI 1998/1870).
Citation sources
For individuals and others within the charge to Capital Gains Tax on disposals of shares on or after 6 April 2008 the previous identification rules were simplified with the reintroduction of the Section 104 holding for new acquisitions and its widening to include all shares acquired before 31 March 1982 and after 5 April 1998. Section 106A provides that, for matching acquisitions and disposals of shares of the same class in the same company held in the same capacity the identification rules set
Part IV Shares, securities, options etc. Chapter I General Share pooling, identification of securities, and indexation Identification of securities: ... capital gains tax. 106A 1 This section has effect for the purposes of capital gains tax (but not corporation tax) where any securities are disposed of by any person. 2 The securities disposed of shall be identified in accordance with the following provisions of this section with securities of the same class that have been acquired by the person
An Individual Savings Account (ISA) is a financial product for personal investors to contribute a limited annual amount to an investment account. Income from an ISA is exempt from Income Tax. Only shares listed on a recognised stock exchange may be held in an ISA, although this was relaxed somewhat in August 2013 when it was permitted to hold shares traded on a wider range of markets in a stocks and shares ISA. If the deceased held any shares in an ISA, the taxpayer will include them on the IHT4
This is defined at FA12/S60 by reference to ITTOIA05/S695 (1). A friendly society may write ISA business. Until 2005 it was limited, like insurance companies, to policies with premiums not exceeding £1000 per year per ISA. This is additional to the exempt life or endowment business exemption of £270 per year. The separate insurance component of an ISA was abolished from 6 April 2005. From that date, an insurance policy falls either in the stocks and shares component or the cash component of the
ebt is an asset for CG purposes, but any disposal of the debt would be expected to be exempted by section 251 Taxation of Chargeable Gains Act (TCGA) 1992 (see CG53400P). Shares Where the sum received from RFL is chargeable to tax as income or taken into as income, section 37 TCGA 1992 will exclude from the consideration that much of the sum. If any of the sum is capital, there is a disposal of the shares. ISA There is an exemption to the above treatment where those assets were held within an In