A gilt is a bond issued by the UK government: you lend the Treasury a sum of money, receive a fixed rate of interest paid every six months, and get your original amount back on a set maturity date. That is how a gilt works in one sentence, and everything else — the varieties, the pricing quirks, the tax rules — is detail layered on top of that basic loan. The name comes from the gold-gilded edges of the original paper certificates, a reference to the sovereign guarantee standing behind every payment.
The Three Parts of Every Gilt
Every gilt has a face value, a coupon rate, and a maturity date. The face value, known as the nominal amount, is what the government promises to repay when the bond matures. Gilts can be held in units as small as a penny, but £100 is the standard unit used for pricing.1United Kingdom Debt Management Office. A Private Investor’s Guide to Gilts Maturity dates range from a couple of years out to several decades.
The coupon rate is the fixed annual interest paid on that nominal amount, split into two equal payments six months apart.2Debt Management Office. Formulae for Calculating Gilt Prices from Yields A 4% gilt with a £100 nominal value pays £2 every six months until maturity, when the final £2 arrives with the £100 principal. That predictability is the whole point for income-focused holders.
The Main Types of Gilts
Conventional Gilts
Conventional gilts are the standard version and the bulk of what the government issues. The coupon is fixed for the life of the bond and does not change if inflation rises or interest rates move. Buy a 4% conventional gilt at face value and you receive £4 per year per £100 nominal, every year, until it matures.
Index-Linked Gilts
Index-linked gilts adjust both the coupon payments and the final principal repayment to track the UK Retail Prices Index.3UK DMO. Index-linked Gilts If RPI rises 3% over a year, your coupon and eventual payout grow by roughly the same, protecting purchasing power in a way conventional gilts cannot.
The adjustment runs on a lag. Older index-linked gilts apply an eight-month lag between the RPI reading and its use, so the inflation figure used for a coupon was actually recorded eight months earlier. Gilts issued after July 2005 use a three-month lag, and their index ratio recalculates daily rather than monthly.4Debt Management Office. 3M Lag Index-linked Gilts The lag matters if you are trying to hedge near-term inflation; older stock is always reacting to older data.
Green Gilts
Green gilts are structurally identical to conventional gilts, with the same coupon mechanics and the same sovereign guarantee. The difference is that the proceeds are earmarked for specific environmental spending under the UK Government Green Financing Framework, covering areas such as clean transport, renewable energy, and pollution prevention, with military nuclear spending explicitly excluded.5Debt Management Office. UK Green Financing Programme
Gilt Strips
A strip is what you get when a gilt’s coupon payments and its principal repayment are separated and sold as standalone zero-coupon bonds.1United Kingdom Debt Management Office. A Private Investor’s Guide to Gilts A 5% gilt with four years to run can be broken into nine pieces: eight semi-annual coupon strips and one principal strip. Because each strip pays nothing until its own maturity date, it trades at a discount to face value. That discount narrows as maturity approaches, and the gap between what you pay and the £100 you receive at the end is your return. Strips suit anyone who needs a precise sum on a specific future date without worrying about reinvesting coupons along the way.
How Prices and Yields Move
Once a gilt is issued, its price in the secondary market moves inversely to interest rates. When market rates rise, the fixed coupon on an existing gilt looks less attractive, so its price falls below face value to compensate. When rates fall, that same coupon becomes more valuable, and the price rises above face value. This inverse relationship is the central mechanic of every fixed-income market.
Yield to maturity is the figure that lets you compare gilts trading at different prices. It calculates the annualized return you would earn buying at today’s market price and holding to maturity, collecting every coupon in between. A gilt bought at £95 with a 4% coupon yields more than 4%, because you also pocket the £5 gain when the Treasury repays £100 at the end. Buy the same gilt at £105 and you yield less than 4%, because that £5 premium erodes your total return.
How much a gilt’s price swings when rates change depends heavily on how much life it has left. A gilt maturing in two years barely reacts to a rate move, because the principal is coming back soon anyway. A thirty-year gilt is far more sensitive, because holders are locked into today’s coupon for decades. That is why long-dated gilts posted dramatic price drops during the 2022 rate-hiking cycle while short-dated stock held comparatively steady. Investors who want stability lean short; those chasing higher yields and willing to stomach volatility lean long.
How You Actually Buy a Gilt
New gilts are sold at auctions run by the UK Debt Management Office, an executive agency of His Majesty’s Treasury.6UK Debt Management Office. DMO Home Only Gilt-Edged Market Makers, a group of specialist financial institutions, can bid directly.7UK Debt Management Office. Gilt Market Recent DMO prospectuses restrict non-competitive bids to those firms as well.8UK DMO. 4 1/8% Treasury Gilt 2031 Prospectus Individual investors access newly issued gilts through a stockbroker or through the DMO’s own Purchase and Sale Service, both of which pick them up on the secondary market shortly after issuance.1United Kingdom Debt Management Office. A Private Investor’s Guide to Gilts
The secondary market itself is centered on those same market makers, who are obligated to quote buy and sell prices throughout the trading day, giving the market continuous liquidity.7UK Debt Management Office. Gilt Market
The price you see quoted is usually the clean price, which reflects market value without any interest built up since the last coupon. What you actually pay is the dirty price, which adds that accrued interest on top. The DMO calculates the accrual using an actual/actual day-count convention, counting real calendar days rather than a simplified 30-day month.9Debt Management Office. Formulae for Calculating Gilt Prices from Yields Buy a gilt the day before a coupon date and your dirty price will be noticeably higher than the clean price, but the full coupon lands in your account shortly afterward.
Ownership transfers electronically through the CREST settlement system, and the buyer receives immediate and irrevocable legal title with no paper certificates involved.1United Kingdom Debt Management Office. A Private Investor’s Guide to Gilts Settlement currently completes two business days after the trade (T+2). The UK is scheduled to move to one-business-day settlement (T+1) on 11 October 2027.10Financial Conduct Authority. About T+1 Settlement
Tax Treatment for UK Investors
Gilts carry a meaningful tax advantage in the UK. Any capital gain from selling before maturity, or from buying at a discount and holding to redemption, is entirely free of capital gains tax. The exemption sits in Section 115 of the Taxation of Chargeable Gains Act 1992 and applies to both individuals and companies.11Legislation.gov.uk. The Taxation of Chargeable Gains (Gilt-edged Securities) Order 2025
Coupon income is a different matter. It is taxed as income at your marginal rate, and coupons are paid gross with no tax deducted at source, so the income needs to go on your self-assessment return.
If You’re Not a UK Investor
Gilts are denominated in pounds sterling, so any investor whose home currency is different is taking on exchange-rate risk on top of the bond’s own price movements. Buying a gilt as a U.S. investor is effectively two bets: one on the bond and one on the pound. A 5% fall in sterling against the dollar over your holding period can wipe out a significant chunk of the return even if the gilt itself behaves exactly as expected; a rising pound works the other way. On shorter-dated gilts, this currency exposure can easily dwarf the coupon income. Institutional investors hedge sterling exposure through forward contracts or currency swaps, but individual investors rarely have access to cost-effective hedging, so the practical choice is to accept the risk or stick with government bonds in your own currency.
U.S. investors also pick up reporting obligations. If the combined value of all your foreign financial accounts exceeds $10,000 at any point during the year, you have to file an FBAR (FinCEN Form 114) with the Treasury’s Financial Crimes Enforcement Network.12Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) Separately, under the Foreign Account Tax Compliance Act, U.S. taxpayers with foreign financial assets above certain thresholds must file Form 8938 with their annual tax return. For unmarried taxpayers living in the United States, the trigger is more than $50,000 on the last day of the tax year or more than $75,000 at any point during the year; for joint filers, $100,000 and $150,000. Taxpayers living abroad face substantially higher thresholds. The penalty for failing to file Form 8938 starts at $10,000 and can climb to $50,000 if IRS notices go ignored, with a further 40% penalty on any tax underpayment tied to undisclosed assets.13Internal Revenue Service. Summary of FATCA Reporting for U.S. Taxpayers