If shares are the exciting part of investing, bonds are the steady, dependable counterpart that most people overlook until they need it. The word itself can sound technical, but the underlying idea is refreshingly simple: a bond is a loan. When you buy a bond, you are lending money to a government or a company, and in return they promise to pay you interest for a set period and then hand your original money back. Because they are contracts with a promise of repayment, bonds are generally less volatile than shares — which is precisely why they earn a permanent place in most sensible portfolios.
For a beginner, the challenge is that the world of fixed income has its own vocabulary and its own set of risks that aren’t always obvious. Once you grasp a few core ideas — what the coupon is, why prices move against rates, and the trade-off between safety and yield — bonds stop being a mystery and become one of the most useful tools you own.
The anatomy of a bond
Every bond is built from the same few parts, and the jargon becomes manageable once you map them. The face value is the amount you lend — typically £1,000 per bond. The coupon is the interest rate the borrower pays, so a 5% coupon on a £1,000 bond pays £50 a year. The maturity is the date when the borrower must return your principal. The yield is the effective return you actually earn once you account for the price you paid, which can differ from the coupon. And the credit rating is an assessment of how likely the borrower is to repay, where AAA is the safest category and lower grades mean more risk.
Hold these five ideas in your head and you’ll be able to make sense of almost any bond product, from a UK Gilt to a corporate bond, because they all work on the same template.
The main types of bond
Government bonds are issued by national governments and are considered very low risk because governments can generally raise the money to repay them through taxation and borrowing. In the UK these are called Gilts, in the US Treasuries, in Germany Bunds and in Japan JGBs. Their yields have varied a lot over recent years as interest rates have moved: in 2026, UK Gilts have been trading at yields of around 4.0–4.5%, US Treasuries roughly 4.25–4.75%, German Bunds closer to 2.5–3.0%, and Japanese JGBs lower still at around 0.5–1.0%. These figures are indicative of a particular moment in the rate cycle and will shift as central banks act.
Corporate bonds are issued by companies, and here the trade-off between risk and reward becomes clear. A company with an AAA rating, reflecting very strong finances, might pay yields in the region of 3.5–4.5%; a solid investment-grade firm rated BBB might offer 4.5–6.0%; a speculative BB-rated borrower could pay 6–8%; and a distressed firm rated CCC might offer 10–15% or more. Those higher yields are compensation for a higher chance that the borrower defaults. The lower the credit rating, the more you’re being paid to take the risk that you don’t get your money back.
High-yield bonds — often called junk bonds — are the bonds rated BB and below. They offer the potential for much higher returns, but with a meaningfully higher risk of default, so they’re best treated as a smaller, riskier slice of a fixed-income allocation rather than its core.
Why bond prices move against interest rates
This is the single most important idea in fixed income, so it’s worth getting right. Bond prices and interest rates move in opposite directions. When interest rates rise, the price of existing bonds falls. When rates fall, existing bond prices rise.
Here’s why. Suppose you buy a five-year bond paying a 4% coupon. If interest rates then rise to 5%, new bonds are paying more than yours. To sell your bond to anyone else, you have to lower its price until its effective yield matches the going rate of 5%. Your bond’s price has fallen. The reverse happens if rates drop: your 4% coupon suddenly looks better than new 3% bonds, so buyers will pay more for it. This sensitivity is called interest rate risk, and it’s the main reason even very safe bonds can fall in value.
Duration: how much a bond reacts
Not all bonds react to a rate change equally. Duration measures how sensitive a bond is to interest rate moves, and it relates closely to maturity. As a rough rule of thumb, a bond with a one-year duration might change in value by around 1% for each 1% move in rates; a five-year bond by roughly 5%; a ten-year bond by around 10%; and a twenty-year bond by something like 20%. The longer the duration, the more the price swings, and the bigger the reward for correctly backing the direction of rates.
For beginners this has a practical consequence: if you expect rates to be volatile, or you need the money soon, shorter-duration bonds are the steadier choice, while longer-duration bonds are held by those who can absorb the price swings.
How to invest in bonds
You don’t need to buy individual bonds to benefit from fixed income. There are several routes, each with different minimums and trade-offs:
| Method | What it is | Minimum |
|---|---|---|
| Individual bonds | Buying bonds directly from government or companies | £1,000+ per bond |
| Bond ETFs | A basket of bonds traded like a share | From a few pounds |
| Bond funds | Professionally managed, active or passive | £500+ |
| Savings bonds | UK National Savings products like Premium Bonds | £25 |
For most beginners, bond ETFs are the easiest starting point: they give you instant diversification across many bonds, low minimums, and they trade as easily as buying a share. Popular examples include the iShares £ Gilts UCITS ETF, which tracks UK government debt; the Vanguard Global Bond Index Fund, which holds government bonds from around the world; the iShares $ Treasury Bond ETF for US government debt; and the iShares Corporate Bond Index for investment-grade company bonds. These illustrate the range available, but the right choice for you depends on your platform, your currency exposure and how comfortable you are with each type — check what’s actually offered where you invest.
How much of your portfolio should be bonds?
Bonds are stabilisers, and their role grows as you get older and closer to goals. A common rule of thumb is that younger investors, in their twenties and thirties, hold little or nothing in bonds — from 0–10% rising to 10–20% — because they have decades to ride out share volatility. Investors in their forties might hold 20–40% as they start prioritising stability, and those in their fifties 40–60% to protect capital. From sixty onwards, allocations of 50–70% are common once generating income and guarding capital matter more than growth. These are broad, indicative bands rather than prescriptions, and they should always be adjusted for your own situation and risk tolerance.
The bottom line
Bonds are the unglamorous backbone of a balanced portfolio. They provide income, spread your risk, and cushion your shares when markets fall. They won’t make headlines like a soaring tech stock or a bitcoin rally, but they reliably do their job. Start with a low-cost bond ETF, match the duration to your timeframe, and reinvest the interest to let your fixed income compound quietly over the years. Understood properly, bonds are not a boring compromise — they’re the asset that lets you keep more of your money invested without losing sleep.
This article is educational and not personalised financial advice. Seek independent guidance for your own circumstances.