5% Gilt Yields Sound Tempting — Until You Watch Your Capital Evaporate

Gilt yields and gilt prices move in opposite directions. This is bond maths 101, but a remarkable number of people who buy gilts don’t grasp it until they open their portfolio and see red.

A 10-year gilt has a duration of roughly 8 years. In plain English, that means if yields rise by 1 percentage point, the market value of your gilt falls by approximately 8%. The current 10-year yield sits at 4.94%. If yields climb to 6% — which is entirely plausible given four further rate rises are priced in by markets — your gilt loses roughly 8-10% of its capital value. On a £10,000 investment, that’s £800 to £1,000 gone.

Yes, you still collect your coupon. Yes, if you hold to maturity you get your par value back. But "hold to maturity" on a 10-year gilt means locking up your money until 2036. A lot can happen in a decade. You might need that money for a house deposit, a medical bill, or an unexpected redundancy. If you sell early in a rising-rate environment, you crystallise a loss.

The 30-year gilt at 5.56% looks even more attractive on paper and is even more dangerous. Its duration is around 17-18 years. A 1% rise in yields wipes out 17-18% of your capital. That’s not a theoretical risk — it’s what happened in 2022 when the mini-Budget sent gilt yields soaring and pension funds scrambled to meet margin calls. Long-duration gilts lost over 30% of their value in weeks.

Savings accounts have a duration of zero. Your £10,000 stays at £10,000 regardless of what the Bank of England does tomorrow.

The Bank of England held the base rate at 3.75% in its last decision, where it’s sat since 18 December 2025. But the market isn’t pricing in cuts any more. It’s pricing in four rate rises this year.

The Iran conflict has sent energy prices surging, reviving the inflation threat that the BoE thought it had beaten. Higher energy costs feed through to transport, manufacturing, food — everything. The BoE’s mandate is price stability, and if inflation reaccelerates, they will raise rates regardless of the damage to growth or house prices.

Each rate rise makes existing gilts less attractive compared to newly issued ones, pushing down prices. If the base rate reaches 4.75% by year-end — which is what four 25-basis-point hikes would deliver — the 10-year gilt you bought today at 4.94% will be competing with new issuance at 5.5% or higher. The maths is brutal.

For savings accounts, rising rates are purely good news. When the BoE raises rates, banks raise deposit rates to compete for funding. Your easy-access account paying 4.55% today could be paying 5%+ by autumn. You benefit from every single rate rise without lifting a finger. No selling, no buying, no capital loss — just a higher interest payment landing in your account each month.

Cash deposits up to £85,000 per person, per institution are protected by the Financial Services Compensation Scheme. Joint accounts get £170,000. If your bank fails, you get your money back within seven working days. No arguments, no haircuts, no waiting for liquidators to sort through the wreckage.

Gilt holders will point out that gilts are sovereign debt — backed by the full faith and credit of the UK government. True. The risk of the UK defaulting on its gilts is effectively zero. But credit risk isn’t the danger with gilts. Market risk is. Your gilt won’t default, but its market value can drop 10%, 20%, even 30% depending on duration and rate movements.

FSCS protection eliminates both credit risk and market risk. Your principal cannot fall below what you deposited. That combination of guarantees is extraordinarily powerful, and most people don’t appreciate it until a crisis arrives.

For savers with more than £85,000, spreading deposits across multiple institutions maintains full FSCS coverage. Three banks gives you £255,000 of fully protected savings. Five banks gives you £425,000. NS&I products are backed directly by HM Treasury with no upper limit, though their rates — 3.05% on the Direct Saver, 3.60% on Premium Bonds dropping to 3.30% from April — lag behind the best savings accounts significantly.

Basic-rate taxpayers get a £1,000 Personal Savings Allowance. Higher-rate taxpayers get £500. Interest earned within these thresholds is completely tax-free.

At 4.55% on an easy-access account, a basic-rate taxpayer can hold roughly £21,978 before any tax is due on their interest. For most people, the PSA covers their entire savings balance. That makes the effective return on a savings account identical to the gross rate — 4.55% tax-free.

Gilt interest (the coupon) is taxed as income, just like savings interest, and uses the same PSA. But capital gains on gilts are exempt from CGT. Gilt enthusiasts love this point. However, the CGT exemption only helps if your gilt rises in price — and in a rising-rate environment, gilt prices fall. The CGT exemption on a loss-making investment is worth precisely nothing.

Cash ISAs paying 4.68% shelter interest from tax entirely, with no upper limit on the tax-free amount within your £20,000 annual allowance. If you’re a higher-rate taxpayer with significant savings, a cash ISA is almost certainly the right vehicle before you even consider gilts.

The Bank of England publishes average savings rates monthly. The spread between the best accounts and the average has widened since 2023, rewarding savers who actively shop around. A basic-rate taxpayer earning 4.55% on £20,000 pays zero tax on that interest — the PSA handles it entirely. The same taxpayer buying gilts and earning coupon income gets no additional tax benefit, just the same PSA threshold.

Easy-access savings accounts do exactly what the name suggests. The FCA requires that banks process withdrawals promptly, and most UK banks now offer same-day access via Faster Payments. You withdraw your money whenever you want — same day, often within minutes via faster payments. No buyer needed. No bid-offer spread. No settlement period.

Selling a gilt requires a counterparty. For retail investors, that typically means selling through a broker, paying a dealing fee, and accepting whatever price the secondary market offers. In calm markets, gilt liquidity is fine. In a crisis — precisely when you’re most likely to need your money — liquidity can evaporate. We saw this during the 2022 LDI crisis when gilt market liquidity seized up and the Bank of England had to intervene as buyer of last resort.

Even fixed-rate savings bonds offer more certainty than gilts. You know your rate, you know your term, and you know your money is protected. With gilts, you know your coupon rate but you have no idea what price you’ll receive if you need to sell before maturity.

For an emergency fund or any money you might need within the next five years, gilts are the wrong instrument. Full stop.

Gilts aren’t always a bad choice. They make sense in specific, narrow circumstances:

Matching a known future liability. If you need exactly £50,000 in 2036 — and you can find the right maturity on the DMO's gilt issuance schedule — for a child’s university fees, a 10-year gilt held to maturity locks in a known return with no reinvestment risk. You buy it, clip the coupon, collect par at maturity. The interim price fluctuations are irrelevant because you’re never selling.

Deflation hedging. If you believe the UK is heading for deflation rather than inflation — which would be a contrarian call right now — gilts would rally hard as the BoE slashed rates. But with energy prices surging and four rate rises priced in, this isn’t the base case.

Large portfolios requiring diversification. Institutional investors and those with seven-figure portfolios may benefit from gilt allocation for portfolio construction reasons. That’s a different conversation from a saver choosing between a gilt and a savings account.

For everyone else — which is the vast majority of UK savers — the best easy-access savings account or fixed-rate bond is the superior choice right now.