Bonds Guide: UK Bonds Explained — Government Gilts, Corporate Bonds and How to Invest in Fixed Income

A bond is essentially a loan you make to a borrower — typically a government or a company — in exchange for regular interest payments and the return of your capital at a set date. When you buy a bond, you become a creditor rather than an owner, which is the fundamental difference between bonds and shares.

Every bond has three key features: a face value (also called par value, usually £100 for UK gilts issued by the UK Debt Management Office (dmo.gov.uk), an agency of HM Treasury (gov.uk/government/organisations/debt-management-office)), a coupon (the annual interest rate paid on the face value), and a maturity date (when the borrower repays the face value). A gilt with a 4% coupon — see the DMO for current gilt data (dmo.gov.uk), part of GOV.UK and a face value of £100 pays £4 per year in interest, typically in two semi-annual payments of £2.

The price of a bond in the secondary market fluctuates based on interest rates, inflation expectations, and the creditworthiness of the issuer. When interest rates rise, existing bond prices fall — because new bonds offer higher coupons, making older lower-coupon bonds less attractive. This inverse relationship between bond prices and yields is the most important concept in fixed income investing. The yield — the return you actually receive based on the current market price rather than the face value — is what matters most to investors buying bonds today. For more details, see our guide on how UK gilts work.

Gilts are bonds issued by the UK government through the Debt Management Office (DMO). They are considered among the safest investments in the world because they carry the full backing of HM Treasury. The name 'gilt-edged securities' dates back to the original certificates, which had gilded edges — signifying their reliability.

There are three main types of gilt. Conventional gilts pay a fixed coupon and return the face value at maturity — these account for around 75% of the gilt market. Index-linked gilts have coupons and redemption values that adjust with the Retail Prices Index (RPI), providing inflation protection. Treasury bills are short-term government securities (typically 1, 3, or 6 months) sold at a discount to face value rather than paying coupons.

UK gilt yields have been notably elevated through 2025 and into 2026, reflecting the Bank of England's higher interest rate environment. Long-term gilt yields have ranged between 4.45% and 4.69% over the past twelve months — a level that makes them genuinely competitive with cash savings for the first time in years.

You can buy gilts directly from the DMO through its Purchase and Sale Service for as little as £100, or through a stockbroker. However, most retail investors access gilts through funds or ETFs, which provide diversification across different maturities and are easier to trade. For more details, see our guide on gilt yields explained.

Corporate bonds are issued by companies to raise capital, and they typically offer higher yields than government gilts to compensate investors for the additional risk. The yield premium over gilts — known as the credit spread — varies depending on the company's creditworthiness, the bond's maturity, and broader market conditions.

Investment-grade corporate bonds (rated BBB or above by agencies like Moody's, S&P, or Fitch) from well-known UK companies such as Tesco, National Grid, or Barclays might yield 5-6% — roughly 0.5% to 1.5% above equivalent gilts. High-yield bonds (rated below BBB, sometimes called 'junk bonds') offer even higher returns but carry significantly greater risk of default.

The UK corporate bond market is substantial, with major issuers including banks, utilities, telecoms companies, and large retailers. Unlike gilts, corporate bonds carry credit risk — the possibility that the issuer cannot meet its interest payments or repay the principal. During economic downturns, credit spreads tend to widen as investors demand more compensation for this risk.

For most retail investors, individual corporate bonds are impractical to buy directly — minimum investments are often £10,000 or more, and building a diversified portfolio of individual bonds requires significant capital. Bond funds and ETFs solve this problem by pooling investor money across dozens or hundreds of different bonds, providing instant diversification at a much lower entry point. For more details, see our guide on index-linked gilts.

Bond funds and exchange-traded funds (ETFs) are the most accessible way for UK retail investors to add fixed income to their portfolio. Rather than buying individual bonds, you invest in a fund that holds a diversified basket of bonds managed by a professional team.

Gilt funds focus on UK government bonds. Popular options include the iShares Core UK Gilts UCITS ETF and the Vanguard UK Government Bond Index Fund, both of which track broad gilt indices with annual charges of around 0.07-0.12%. For investors wanting inflation protection, index-linked gilt funds track the performance of linkers.

Corporate bond funds invest in bonds issued by companies. The Vanguard UK Investment Grade Bond Index Fund and the iShares £ Corporate Bond ETF provide broad UK corporate bond exposure with charges around 0.12-0.15%. These funds typically yield more than gilt funds but carry some credit risk.

Strategic bond funds give managers flexibility to invest across gilts, corporate bonds, high yield, and international fixed income. These actively managed funds charge more (typically 0.3-0.6% per year) but can adapt to changing market conditions.

One important distinction: bond funds do not have a fixed maturity date like individual bonds. The fund continuously buys and sells bonds, so there is no guaranteed return of capital at a specific date. If interest rates rise, the fund's value will fall — and unlike holding an individual bond to maturity, you cannot simply wait for your money back at par. This duration risk is the main trade-off of using funds versus individual bonds. For more details, see our guide on how to buy gilts.

Not all fixed income investments are traditional bonds. Premium Bonds, backed by HM Treasury (gov.uk/national-savings) from National Savings & Investments (NS&I) are one of the UK's most popular savings products, held by around 23 million people. Rather than paying interest, Premium Bonds enter holders into a monthly prize draw with a current prize fund rate of 3.3% — meaning the average return across all bondholders equates to 3.3% annually, though individual returns vary widely.

Premium Bonds offer 100% capital security (backed by HM Treasury) and all prizes are tax-free, making them particularly attractive for higher-rate and additional-rate taxpayers who have used their Personal Savings Allowance. However, at 3.3%, they yield less than gilts or cash savings accounts, and the return is probabilistic rather than guaranteed.

NS&I also offers Income Bonds and Guaranteed Growth Bonds and Guaranteed Income Bonds (fixed-rate products when available), all of which carry HM Treasury backing. These are not bonds in the traditional investment sense — they're savings products — but they serve a similar role in providing fixed income with capital security.

Fixed-rate savings bonds from high street banks are another alternative, offering fixed returns over 1-5 year terms. With the best 1-year fixes currently paying around 4.5-4.8%, they can compete with or exceed gilt yields while being simpler to understand and covered by the Financial Services Compensation Scheme (FSCS) up to £85,000 per institution.

Understanding the tax treatment of bond income is crucial because it varies significantly depending on the type of bond and how you hold it.

Gilt interest is paid gross (without tax deducted) and is subject to income tax at your marginal rate — 20% for basic-rate taxpayers, 40% for higher-rate, and 45% for additional-rate. However, gilts are exempt from capital gains tax (CGT), which makes them particularly attractive for investors who buy below par value and benefit from a capital gain at redemption. This CGT exemption does not apply to corporate bonds held directly.

Corporate bond interest is also taxable as income. If you hold corporate bonds in a fund or ETF, the income distributions are taxed as savings income and benefit from the Personal Savings Allowance — £1,000 for basic-rate taxpayers and £500 for higher-rate taxpayers. Additional-rate taxpayers receive no Personal Savings Allowance.

The most tax-efficient way to hold bond funds is within an ISA or SIPP. Inside a Stocks and Shares ISA (annual allowance: £20,000 for 2025/26), all bond income and capital gains are completely tax-free. Inside a SIPP, contributions benefit from tax relief and income is tax-free within the pension wrapper, though withdrawals are taxed as income in retirement.

For investors with significant bond holdings outside tax wrappers, the combination of the Personal Savings Allowance (for fund distributions), the starting rate for savings (0% on the first £5,000 of savings income if total income is below £17,570), and the CGT exemption on gilts can reduce the effective tax burden considerably.

The traditional rule of thumb — hold your age in bonds as a percentage of your portfolio — has fallen out of favour, but the underlying principle remains sound: as you approach retirement or need more certainty of income, bonds become more important.

A common starting point for a UK investor in their 30s or 40s might be 20-30% in bonds, rising to 40-60% in their 50s and 60s. However, with gilt yields above 4%, bonds are now offering real returns (above inflation) for the first time in years, which strengthens the case for a meaningful allocation even for younger investors.

Practically, a simple bond allocation for a UK investor might include a core gilt fund (60-70% of the bond allocation) for safety and liquidity, supplemented by an investment-grade corporate bond fund (20-30%) for additional yield, and optionally a small allocation to index-linked gilts (10-20%) for inflation protection. This can be implemented with just two or three low-cost index funds within an ISA or SIPP.

The key consideration is duration — how sensitive your bond holdings are to interest rate changes. Short-duration bonds (maturing in 1-5 years) are less volatile but offer lower yields; long-duration bonds (10-30 years) offer higher yields but can see significant price swings. If you expect interest rates to fall, longer-duration bonds will benefit from price appreciation. If rates remain elevated or rise further, shorter-duration bonds are more defensive.

This article is for informational purposes only and does not constitute regulated financial advice. The value of investments can go down as well as up, and you may get back less than you invest. For personalised advice, consult a qualified financial adviser.