Editor’s note: this is general educational information about how a UK government bond mechanism works, not investment advice. It draws on the legislation, HMRC guidance and official market documents listed at the end.
Analysis: the count is a plumbing fact, the liquidity is not
Two things are worth separating. The number of securities a gilt becomes is fixed by its own payment schedule and by an exchange the Bank of England performs on request. Nothing about that number implies that each of the resulting instruments trades. The official documents describe the secondary market in terms of the parent gilts, not the strips: the DMO says it encourages an efficient and liquid secondary market by means including stewardship of the Gilt-edged Market Makers system, under which GEMMs provide a secondary market in all gilts and are the point of access for institutional investors wanting to take part in auctions. Average daily turnover in the gilt market in 2025-2026 was £47.6 billion, an increase of £3.6 billion, or 8.2%, from £44.0 billion in 2024-2025.
The composition of what is being issued also shapes what can be stripped. In 2025-2026 short-dated conventional gilt issuance was £136.8 billion, medium-dated conventional issuance including green gilts was £103.4 billion, long-dated conventional issuance including green gilts was £32.7 billion, and index-linked issuance was £31.1 billion. The DMO attributes the tilt toward the short and medium parts of the curve to structural changes in demand. A programme weighted that way produces fewer of the long payment schedules that generate the largest strip counts, whatever the arithmetic of any individual bond allows.
What the sources do not establish is any figure for strips outstanding, strip turnover, or the discount at which any particular strip trades, and none of the cited documents reports one. They also do not say which gilts are currently designated strippable, only that certain gilts are. A reader following this mechanism has three checkable things instead: the eligibility designation for a given gilt, since only strippable stock can be surrendered; the deemed disposal date of 5 April, which for a non-corporate holder creates a tax event with no cash attached to it; and the DMO’s issuance split by maturity, which sets how much long-dated raw material the strips market has to work with.
What the documents say
A conventional gilt is a schedule of payments held together by a single security. Stripping takes the schedule apart and gives each payment its own life. HMRC describes the result plainly: the right to each interest payment at separate future dates during the life of the bond, and the right to the principal at maturity, can be bought and sold as separate financial instruments, each equivalent to a zero coupon bond. The cash flows on the resulting bundle are identical to the cash flows on the original unstripped bond.
What the holder actually exchanges
Stripping is an exchange, not a sale. HMRC’s Corporate Finance Manual sets out the transaction: certain gilts are strippable, and the holder can surrender the gilt to the Bank of England, receiving in return a number of gilt strips, each of which is treated as a gilt in its own right. Each strip is a right to receive a payment at a future date, carries no interest, and is therefore like a zero coupon bond, so a buyer pays less than the redemption amount, with the discount depending on the period from purchase to redemption.
The count follows directly from the payment schedule. HMRC’s worked example takes a 10-year gilt paying interest every 6 months and strips it into 21 stripped gilts, one for each interest period plus the principal, by surrendering the original gilt in exchange for 21 new gilt strips. Applying the same rule to a conventional gilt with a 30-year maturity, of the kind the Debt Management Office identifies as a key benchmark alongside the 10-year, gives 60 interest strips and one principal strip, so 61 securities where there had been one.
The reverse operation restores the original. HMRC states that where a collection of strips has the same maturity date it can be reconstituted to form a single gilt, and its corporate example has a company arranging with the Bank of England to reconstitute five gilt strips with the appropriate redemption dates and amounts into a single gilt. Stripping and reconstitution are therefore both round trips through the same official counterparty rather than trades struck in the market.
The statutory plumbing
The authority sits in an old statute that was retrofitted for the purpose. Section 202 of the Finance Act 1996 inserted new paragraphs into section 47 of the Finance Act 1942, the provision under which the Treasury makes regulations about the transfer and registration of government stock. The new paragraphs allow regulations providing for the exchange of any such stock and bonds, whenever issued, for strips of them, and for exchanges by which strips, whether deriving from the same security or from different securities, are consolidated into a single security.
The same section defines what a strip is. It means a security issued under the National Loans Act 1968 which is issued to represent the right to, or to secure, a payment corresponding to a payment of interest or principal remaining to be made under the stock or bond, or two or more such payments; which is issued in conjunction with one or more other securities that together represent every payment remaining to be made under it; and which is not itself a security representing a part of every payment so remaining. The last condition is what stops a pro rata slice of the whole bond from qualifying as a strip.
Two further points of the drafting matter in practice. Exchanges may not be made in any cases other than those where the exchange is at the request of the holder or in accordance with an order made by a court, so nobody is stripped involuntarily. And where stock is exchanged for strips after the balance has been struck for a dividend but before the dividend is payable, the person who would have been entitled to that dividend but for the exchange remains entitled to it, with the Treasury able to deem the balance struck up to 7 days earlier.
How the tax rules treat the pieces
Because a strip pays nothing until it redeems, splitting a bond could otherwise convert taxable interest into deferred gains. The tax code closes that route by classification. HMRC notes that bond stripping could result in tax deferral, since the discount in the early years is small, and that, for the avoidance of doubt, the income tax legislation provides that all strips are deeply discounted securities. A further provision defines strips to include gilt strips and strips of non-UK government securities acquired on or after 27 March 2003 that meet three conditions, which between them require the instrument to represent a right to interest or principal, consolidated into a single security that is not itself the underlying security.
For a non-corporate holder, the same legislation treats that holder as having paid an issue price in direct proportion to the market value of the gilt from which the strips were created, and, on consolidation back into a single security, as receiving the strip’s market value at that time. The holder is then deemed to dispose of all unredeemed strips at each 5 April at market value and immediately reacquire them at the same value, and is taxed on the excess over the previous 5 April value or a more recent acquisition cost, with no deduction for incidental expenses.
Companies are handled through the loan relationship rules with the same objective. On stripping, the loan relationship rules treat the gilt as redeemed for its market value at the time of the strip, crystallising any gain or loss, and that amount is apportioned between the strips in proportion to their market values to give each strip its deemed acquisition cost. HMRC’s illustration has a company acquiring a gilt for £40,000 that pays fixed interest of £2,400 each year for 3 years plus £40,000 of principal, exchanging it at a market value of £40,500 for four strips, and recognising a taxable credit of £500. On reconstitution each strip is deemed redeemed at market value and the rebuilt gilt is acquired at the aggregate of those values, so that, as HMRC puts it, no amounts fall out of taxation.
