A gilt maturing in under two years can currently hand you more of its total return as a tax-free lump sum than as taxable interest — and almost nobody outside a wealth manager's office seems to have noticed. While most savers are still weighing up a cash ISA against a one-year fixed bond, a small and growing number are buying UK government debt directly through an ordinary share-dealing account, and structuring the purchase so that HMRC barely gets a look-in.
What a gilt actually is
A gilt is simply a loan to the UK government, issued by HM Treasury through the Debt Management Office (DMO) and traded on the London Stock Exchange once it's in circulation. You buy a "stock" with a name like Treasury 4.25% 2032, which tells you the annual coupon (4.25% of the £100 face value, paid in two instalments) and the year it repays in full. Hold it to maturity and the government pays you back £100 for every £100 of face value you own, regardless of what you paid for it on the open market. That last part is the whole trick, because gilts rarely trade at exactly £100 — they move up and down with interest rate expectations, so a gilt bought for £96 today that repays at £100 in three years is quietly building in a guaranteed £4 of capital gain on top of whatever coupon it pays along the way.
Conventional gilts are the plain-vanilla version and the ones worth starting with; index-linked gilts, which adjust their principal with RPI, are a different animal with their own quirks and are best left until you understand the conventional market first. Ultra-short gilts maturing within a year or two behave almost like a fixed-term savings account with a known payout date. Longer-dated gilts, running to 2040 or beyond, swing much harder in price when the Bank of England moves rates, which makes them a genuinely different kind of holding — closer to a long-term bet on interest rates than a parking spot for spare cash.
Buying gilts directly: platforms, fees, and the minimum outlay
You don't need a private bank or an intermediary of any kind. Hargreaves Lansdown, AJ Bell, Interactive Investor and iWeb all give retail customers direct access to the secondary gilt market through an ordinary trading account, a Stocks & Shares ISA, or a SIPP. Search the platform's bond or gilt screener by maturity date, pick a stock, and place an order the same way you'd buy a share — settlement happens through CREST, usually the next working day. Dealing costs vary more than you'd expect: Hargreaves Lansdown charges 0.5% of the trade value online, capped at £10, while AJ Bell and Interactive Investor typically charge a flat fee per trade rather than a percentage, which matters a lot if you're investing a small amount and matters much less once you're putting in five figures.
There's no meaningful minimum — you can buy a single £100 unit of face value if you want to, though the flat dealing fees on most platforms make anything under a few thousand pounds not worth the trouble.
In practice, the process comes down to a handful of decisions rather than any real paperwork:
- Pick a maturity date that lines up with when you'll actually want the cash back — not the highest yield on offer.
- Check the "clean price" quoted on the platform against the £100 par value to see roughly how much of the return will arrive as capital gain versus coupon.
- Compare the dealing fee against the size of your purchase, since a flat £9.95 fee on a £2,000 trade eats far more of the return than the same fee on £20,000.
- Decide whether the gilt sits inside a SIPP or ISA (no tax questions at all) or in a bare dealing account, which is where the strategy below actually starts to matter.
None of this takes more than twenty minutes once you know which gilt you want, though picking the right one is the part that actually needs some thought.
Wrap the purchase in a Stocks & Shares ISA or a SIPP and both the coupon and any gain are sheltered from tax anyway, which removes the need for any of the strategy below. The interesting case — and the one most people haven't considered — is buying gilts in an ordinary dealing account, outside any wrapper, once your ISA allowance for the year is already used up.
The part that actually matters: capital gains on gilts are tax-free
Here's the rule that makes this worth reading about at all.
Gains on UK gilts (and on qualifying corporate bonds) are completely exempt from Capital Gains Tax, no matter how large the gain or how short the holding period. Compare that with a stocks and shares portfolio, where anything above the £3,000 annual CGT exemption gets taxed at 18% or 24% depending on your income band, and the appeal of gilts for anyone who's already maxed out their ISA becomes obvious fast.
The coupon interest is a different story: it counts as savings income, taxed at your marginal rate, and only shielded by your Personal Savings Allowance — £1,000 a year if you're a basic-rate taxpayer, £500 if you're higher-rate, and precisely nothing if you're an additional-rate taxpayer. So the entire game, for anyone paying 40% or 45% tax, is to buy gilts where as much of the return as possible arrives as capital gain rather than coupon.
That's why low-coupon gilts issued during the years of near-zero interest rates — stock like Treasury 0.125% 2028, or others from the same 2020–2021 vintage with coupons under 1% — trade well below their £100 face value today and have become a specific, named strategy among higher-rate taxpayers rather than a curiosity. Buy one of these at, say, £91 with two years left to run, and almost the entire £9 uplift to maturity arrives as a tax-free capital gain, while the tiny coupon barely dents your Personal Savings Allowance. A conventional gilt with a 4%+ coupon issued more recently gives you a similar total yield, but far more of it lands as taxable interest. For a higher-rate taxpayer choosing between two gilts with near-identical yields to maturity, the low-coupon one is the better buy every time — there's no scenario where paying 40% on interest beats paying 0% on the equivalent capital gain.
Gilts against a cash ISA or a fixed-rate bond — the actual comparison
Run the numbers side by side and the case sharpens further. Say you've got £15,000 sitting in an easy-access account earning around 4%, and you're a higher-rate taxpayer who's already filled this year's £20,000 ISA allowance. Left where it is, that £15,000 throws off roughly £600 a year in interest, of which £500 is covered by your Personal Savings Allowance and the remaining £100 is taxed at 40% — a modest but real drag. Move the same amount into a low-coupon gilt maturing in two years, priced to yield a broadly similar 4% to maturity, and the picture changes: most of that return arrives as an exempt capital gain when the gilt matures rather than as coupon income, so the tax bill on the same underlying return shrinks to a fraction of what the savings account produced.
A one-year fixed-rate bond from a bank or building society sits somewhere in between — often a marginally higher headline rate than a gilt of similar maturity, but every penny of it taxed as interest, with no tax-free component at all. NS&I products, including Premium Bonds, sidestep this particular comparison because Premium Bond prizes aren't interest in the first place; that's a separate conversation.
None of this makes gilts a free lunch. Gilt prices move between now and maturity, so if you need to sell before the redemption date, you could get back less than you paid if rates have risen since your purchase — the "guaranteed" £100 at maturity is only guaranteed if you actually hold to that date. Anyone treating a gilt like an instant-access account and expecting to cash out early at the price they paid is setting themselves up for a nasty surprise the first time the Bank of England moves rates against them.
There's also a tax quirk worth knowing before you buy mid-way through a coupon period. Under the Accrued Income Scheme, if you buy a gilt between two coupon dates, part of the price you pay reflects the interest that's already built up since the last payment — and HMRC treats that accrued amount as your taxable income for the year, even though you haven't actually received it as cash yet. It's a genuinely fiddly rule, and most dealing platforms handle the calculation for you on the contract note, but it's the sort of detail that catches out anyone assuming gilts are entirely paperwork-free. Buying just after a coupon date, rather than just before one, sidesteps most of the complication.
Liquidity is the other thing to weigh up honestly. The most recently issued, benchmark gilts trade with a tight bid-offer spread and you'll get a fair price within seconds of placing an order; older, smaller issues can have a noticeably wider spread, meaning you give up a bit of value the moment you buy and again if you ever need to sell early. For a holding you plan to take to maturity anyway, that spread barely matters. For anything you might need to unwind in a hurry, it's a real cost — one more reason gilts suit money with a known use-by date rather than money that might be needed at short notice.
Who this actually suits
This isn't a strategy for someone with £2,000 in savings and a full ISA allowance still available — use the ISA first, every time, because a Stocks & Shares or cash ISA shelters both interest and gains with none of the maturity-date complexity a gilt introduces. Gilts earn their place for higher and additional-rate taxpayers who've already used this year's ISA allowance, have a lump sum they can commit to a fixed date without needing early access, and want a genuinely low-risk holding rather than equity market exposure. Retirees drawing down a portfolio in stages, someone saving for a house deposit due in exactly eighteen months, or a self-employed person setting aside next year's tax bill are the people who actually benefit from picking a gilt maturity that lines up with when they'll need the cash back.
If that's not you, a plain cash ISA or a Premium Bonds allocation will do the job with far less admin, and there's nothing wrong with sticking to that until your circumstances change.