NS&I vs Gilts: Which UK Investment Is Best?

National Savings & Investments is the UK government's direct savings bank. Every pound is 100% backed by HM Treasury — not by the £85,000 FSCS limit that caps bank-deposit protection. That distinction matters more for big balances than the headline rates suggest. Below the £85,000 FSCS cap, NS&I has no safety advantage over a UK bank deposit. Above it, NS&I is in a category of its own.

The rates as of May 2026, in plain numbers:

• Premium Bonds: prize fund rate 3.30% from April 2026 (down from 3.60%), odds 23,000 to 1 per £1 bond (lengthened from 22,000 to 1). £25 minimum, £50,000 maximum holding. Returns are tax-free but probabilistic — half of all bondholders win nothing in any given year.
• Direct Saver: 3.30% gross/AER variable, easy access, £1 minimum, £2 million maximum. Interest is paid annually and is taxable as savings income.
• Income Bonds: 3.26% gross / 3.30% AER variable, monthly interest, £500 minimum, £1 million maximum. The monthly payment is the differentiator — Direct Saver compounds, Income Bonds spend.
• Green Savings Bonds: 4.20% gross/AER fixed for 3 years, £100 minimum, £100,000 maximum, no early access. The rate was lifted from 3.82% on the latest issue. This is currently the only NS&I product paying over 4%.
• Fixed Rate / Guaranteed Bonds: not on general sale at the time of writing. NS&I opens and closes these issues based on its annual funding target from HM Treasury.

The Premium Bonds prize fund rate is the most quoted but least understood number on this list. It is the mean payout across all bondholders. The median outcome with a £1,000 holding is zero prizes in a typical year — you need roughly £30,000 invested to expect to win something every month at current odds. With £100 in Premium Bonds you are very likely to win nothing for years. The 3.30% rate is real if you hold the maximum £50,000 long enough; it is closer to 0% for small holdings.

The NS&I funding cycle is the structural reason rates are slipping. NS&I has a Treasury-set net financing target each year. When deposits flow in faster than the target, NS&I cuts rates and tightens odds to push money back out. The April cut and the lengthened odds are exactly that mechanism in action. Rates are heading down because too many savers have already moved their cash here — not because any underlying economic story has changed. For more on the broader UK savings picture see our HYSA-equivalent rate guide and the Gilts hub.

UK government gilts are direct loans to HM Treasury, traded on the London Stock Exchange. You buy them through a stockbroker (Hargreaves Lansdown, AJ Bell, Interactive Investor, iWeb, Fidelity), receive a fixed coupon every six months, and are repaid £100 face value at maturity. Unlike NS&I, gilts have a market price that moves daily — and that has been the entire story of the past three months.

Where yields sit right now (close 7 May 2026 unless noted):

• UK 10-year gilt: ~4.90% — eased from 5.11% on 5 May after the US-Iran de-escalation pulled crude lower. Still 25-30 basis points above the late-Q1 average.
• UK 30-year gilt: 5.62% — touched 5.78% earlier in the week, the highest since 1998. The long end is now pricing meaningfully above the short end.
• Bank Rate: 3.75% — held by the MPC on 30 April 2026 by an 8-1 vote, with one member voting for 4% (a hawkish dissent, not the dovish dissents that dominated the easing cycle).
• CPI: 3.3% YoY in March, projected by the BoE at 3.1% in Q2, 3.3% in Q3 and "rising somewhat further" in Q4.

The shape of the curve matters as much as the level. With Bank Rate at 3.75%, the 10-year at 4.9% and the 30-year at 5.62%, the UK curve is steeply upward-sloping in a way it has not been for most of the last decade. The market is paying you a real term premium to extend duration. That is the polar opposite of the inverted curve British savers got used to in 2023-24.

Why the long end has run so hard: the Iran shock from late April pushed energy back into the inflation print, the BoE projected CPI re-acceleration into Q4, and global term premium repriced for fiscal supply concerns. At 5.62%, a 30-year gilt is paying more than the 30-year US Treasury (4.94% on FRED's DGS30 close, 6 May), reversing the multi-year US-premium pattern.

Mechanics of buying. You need a brokerage account. The minimum trade is typically £100 nominal. Coupons hit twice a year. You can sell on any business day at the prevailing market price. Gilts can be held inside a Stocks & Shares ISA or SIPP; both shelters neutralise the income tax on coupons but do not change the underlying CGT treatment described below. The step-by-step process is covered in our How to Buy UK Gilts guide, and the wrapper-vs-direct trade-off in Gilt Funds vs Direct Gilts.

Tax is where NS&I and gilts diverge most sharply, and it is where the May 2026 numbers stop being a tie.

NS&I tax treatment:

• Premium Bonds: prizes are completely free of UK income tax and capital gains tax.
• Direct Saver, Income Bonds, Green Savings Bonds: interest is taxable as savings income, paid gross. Counts towards your Personal Savings Allowance (PSA) — £1,000 for basic rate, £500 for higher rate, £0 for additional rate.
• ISA wrapper: NS&I products generally cannot be held inside a Stocks & Shares ISA or Cash ISA wrapper (with one historical exception for the Direct ISA, which is closed to new business). The PSA is the only shelter.

Gilt tax treatment:

• Coupons: taxable as savings income, paid gross. Counts towards the same PSA.
• Capital gains on gilts are completely exempt from CGT (Section 115 TCGA 1992). This is the structural advantage and the reason discount gilts work as a tax shelter.
• Gilts can be held inside an ISA or SIPP, sheltering the coupon as well as the gain.

The CGT exemption is the lever. It means you can deliberately choose a low-coupon gilt trading at a discount, take most of your return as a tax-free capital gain, and keep your taxable income unchanged. A worked example using May 2026 prices.

Discount gilt example, higher-rate taxpayer with PSA exhausted:

• Gilt: TG26 (1.625% Treasury Gilt 2026, hypothetical December 2026 maturity), trading around £97.20 to yield ~4.9% to maturity.
• £10,000 invested → buys ~£10,288 nominal.
• Coupon income over the holding period: ~£167 (taxable at 40% = £66.80 after tax).
• Capital gain at redemption: £288 (CGT-free).
• Total after-tax return: roughly 4.5% on £10,000 over the holding period.

Compare with NS&I Direct Saver at 3.30% gross, taxed at 40% above the PSA: 1.98% net. The discount gilt delivers more than double the after-tax yield to a higher-rate saver who has already used their £500 PSA.

Premium Bonds vs gilts, basic-rate taxpayer with PSA spare:

• £10,000 in Premium Bonds at 3.30% prize-fund rate, tax-free: £330 expected (median outcome lower than mean — see Section 1).
• £10,000 in 10-year gilt at 4.90% gross: £490 coupon, all within the £1,000 PSA at this size, so £490 net.
• Gilts win by £160 per £10,000 — but the comparison flips if your PSA is already used by a Cash ISA top-up or other interest, because then gilts revert to 4.90% × 0.80 = 3.92% net for basic rate.

ISA wrapper comparison:

• Inside a Stocks & Shares ISA, the gilt's coupon and any gain are both shielded. The full 4.90% is yours. NS&I outside the wrapper at 3.30% gross is not competitive on after-tax return for any rate band that has access to ISA capacity.
• This is the single strongest argument for shifting NS&I cash held outside any wrapper into ISA-held gilts during the £20,000 annual allowance window — provided the holding horizon and liquidity needs match.

The practical decision rule: if your PSA is already exhausted and you have ISA capacity, gilts dominate NS&I across all maturities at current rates. If your PSA is intact and you cannot use an ISA, the gap narrows but gilts still win on yield alone for any maturity beyond about three years.

Headline yields tell you nothing useful in an inflationary environment. Real yield — the yield minus inflation — tells you whether your money is actually growing in purchasing power. With UK CPI at 3.3% in March 2026 and projected to drift higher through Q4, the real-yield picture is unforgiving for short-end NS&I.

The table below uses CPI 3.3% as the deflator and ignores tax (because tax depends on band and wrapper — covered in the previous section).

• NS&I Direct Saver: 0.00% real. Exactly matches CPI. Your purchasing power is treading water.
• NS&I Premium Bonds: 0.00% real on average, much worse for small holdings. The 3.30% prize-fund rate is the mean; the median return on £5,000 of bonds in a typical year is closer to 1.5-2.0%, which becomes a real yield of -1.3% to -1.8%. Tax-free wrapper does not save you from negative real returns.
• NS&I Income Bonds: -0.04% real on the gross rate. Marginally negative.
• NS&I Green Savings 3-year: +0.90% real. The only NS&I product currently delivering meaningful real yield, but you are locked in for 3 years with no early access — and 3-year forward CPI is the BoE's biggest unknown.
• UK 10-year gilt: +1.60% real at 4.90%.
• UK 30-year gilt: +2.32% real at 5.62%.

Real yield of 1.6% on the 10-year is historically attractive. For most of the 2010s the UK 10-year real yield was negative. The current setup is closer to the early-2000s window when government bonds offered genuine inflation protection alongside HM Treasury credit.

Three caveats before you act on this table.

Caveat 1: market-price risk on gilts is real. The 1.60% real yield assumes hold-to-maturity. If you sell a 10-year gilt three years in and yields have risen another 50 basis points, the price drop can wipe out two years of coupon. NS&I doesn't have that exposure — but it also doesn't have the upside if yields fall.

Caveat 2: inflation might not stay at 3.3%. If the BoE's Q4 projection of further drift comes through (call it 3.7% by year-end), every product on this list except the 30-year gilt slips closer to or below zero real. Index-linked gilts are the explicit hedge here — see Index-Linked Gilts Explained.

Caveat 3: this is a UK-CPI deflator. UK RPI (used by older index-linked gilts) is running materially higher than CPI; if you measure real yield against RPI the entire NS&I block goes negative. Pick your deflator deliberately.

The single-line takeaway: if your only goal is to beat inflation in a guaranteed, government-backed instrument, the 10-year and 30-year gilts are the only products on this list that clearly do so before tax.

Both NS&I and gilts carry HM Treasury's full backing. The credit risk is identical and structurally low. Every other category of risk is different — and that is what determines fit.

Credit risk: identical. Both are obligations of HM Treasury. Unlike bank deposits (capped at £85,000 FSCS protection per institution per person), both NS&I and gilts are backed in full regardless of amount. For balances above the FSCS cap this is the relevant comparison, not bank-vs-NS&I.

Interest rate / market price risk: completely different. NS&I products have no market price. Your capital is always returned at face value, and variable rates can change at NS&I's discretion (downward, as April 2026 demonstrated). Gilts have market prices that move inversely with yields. The duration rule of thumb: a 1% rise in yield costs roughly the modified duration in price. A 10-year gilt has duration around 8 years, so a 1% yield rise is roughly an 8% price drop. The 30-year has duration closer to 18, so a 1% rise is an 18% price drop. Hold to maturity and you are paid £100 regardless. Sell early and you accept whatever the market quotes. This is the trade — you are paid the term premium for taking duration risk; you are not paid it on NS&I because NS&I doesn't have duration.

Inflation risk: both are vulnerable, gilts more transparently so. Conventional gilts pay a fixed nominal coupon. If CPI runs above the implied breakeven, real returns disappoint. NS&I variable rates can adjust upward with inflation in principle, but only when NS&I chooses to — and the April 2026 cut shows the direction tends to follow the funding target rather than CPI. The clean inflation hedge is index-linked gilts, where the principal and coupon both inflate.

Liquidity risk: NS&I varies by product, gilts are uniformly liquid at price. Direct Saver and Income Bonds offer essentially instant withdrawal. Premium Bonds payouts take 5-10 working days. Green Savings Bonds have no early access at all for the 3-year term. Gilts can always be sold at market price on any business day, but the price is whatever the market quotes — which can be below your purchase price.

Reinvestment risk: applies to both, more acutely to NS&I. When a fixed NS&I bond matures, you face whatever NS&I rates exist that week. With NS&I in net-cutting mode (April 2026 prize-fund cut, Direct Saver flat at 3.30% since March 2025), reinvestment risk is not theoretical. Gilts of various maturities let you build a ladder staggered across the curve — a tool NS&I cannot replicate.

Operational risk: NS&I has the simpler model. No brokerage account, no settlement instructions, no decisions about which specific issue to buy. The 23,000-to-1 prize odds are mechanical, not discretionary. Gilts require you to read a clean-price quote, understand accrued interest, and pick a specific issue with a specific maturity. The friction is real for first-time buyers, although the How to Buy UK Gilts guide walks through it.

The practical summary: NS&I is a savings account with HM Treasury guarantee. Gilts are an investment with HM Treasury credit and market price exposure. Same issuer, different risk-and-return contracts.

The lock-in / liquidity decision is the second axis after tax band. Most of the practical mistakes savers make in this space are not about misjudging yield — they are about putting money in the wrong-duration vehicle for the actual job. The decision tree below cuts through it.

Step 1: Will you need this money in less than 6 months?

• Yes → NS&I Direct Saver or Income Bonds (instant access, 3.30% AER, no market risk). Anything else is too brittle for this horizon.
• No → continue to Step 2.

Step 2: Is there any chance you'll need access within the next 3 years?

• Yes (any chance) → stay liquid. Either Direct Saver / Income Bonds or short gilts (1-3 year maturities) bought outside an ISA wrapper if you need them sellable. Avoid Green Savings Bonds — the 3-year lock is real and there is no early-access hatch.
• No, this is genuinely 3-5 year money → continue to Step 3.
• No, this is 7+ year money → skip to Step 4.

Step 3: 3-5 year horizon, lock-in tolerated.

• Higher-rate or additional-rate taxpayer with ISA capacity → 3-5 year gilts inside a Stocks & Shares ISA. Currently around 4.5-4.7% gross, fully sheltered. Beats Green Savings Bonds 4.20% on tax efficiency.
• Higher-rate or additional-rate taxpayer without ISA capacity for this pot → discount gilt outside ISA, taking advantage of the CGT exemption. Beats Green Savings Bonds on after-tax math (see Section 3 worked example).
• Basic-rate taxpayer with PSA still spare → it is genuinely close. Green Savings Bonds 4.20% guaranteed and tax-free-via-PSA, vs 5-year gilt around 4.7% gross. Green Bonds win on simplicity; gilts win by ~30 basis points but lose on lock-in flexibility (gilts can be sold).
• Basic-rate taxpayer with PSA used up → 5-year gilt outside ISA at 4.7% × 80% = 3.76% net. Green Bonds 4.20% tax-free. Green Bonds win in this specific corner.

Step 4: 7+ year horizon, willing to take duration risk.

• This is gilt territory. The 10-year at 4.9% and 30-year at 5.62% are paying real-yield premiums (1.6% and 2.32% over current CPI) that NS&I cannot match. Hold to maturity to avoid the market-price exposure, or accept that you might exit at a price discount if rates rise further.
• Within a SIPP or ISA, the entire return is sheltered.
• Outside any wrapper, use discount gilts to convert most of the return to tax-free capital gain (Section 3).
• Premium Bonds can supplement here only if you specifically value the lottery-like prize structure for the £25-£500 micro-prize stream — but the expected real yield is essentially zero.

Step 5: balance above £85,000 FSCS cap on top of all of the above.

• This is the one corner where NS&I has a clear structural advantage even at lower yield. Any cash you need to keep in a safe, liquid, government-backed instrument above the £85,000-per-bank FSCS limit can sit in NS&I (Direct Saver up to £2m, Income Bonds up to £1m) without the spreading-across-banks operational headache.
• If the same balance can sit in gilts (no FSCS cap, full HM Treasury backing), gilts win on yield. The trade is yield versus operational simplicity.

The one rule that overrides every step above: if you can use an ISA, use the ISA. £20,000 of ISA capacity per tax year is the single most efficient shelter for gilt-like instruments, and NS&I does not compete inside it.

The May 2026 setup makes the answer cleaner than it has been for years.

Default to gilts when:

• You are a higher-rate or additional-rate taxpayer (gilt CGT exemption + ISA wrapper turns the after-tax math decisively).
• You have a 3+ year horizon and can tolerate market-price fluctuation in exchange for term premium.
• You want to lock in a specific yield to a specific date — gilt maturities span months to 50+ years; NS&I does not.
• You can use an ISA or SIPP for the position.
• You need real yield (i.e. yield above 3.3% CPI), which only the 10-year and 30-year deliver in May 2026.

Default to NS&I when:

• You hold a balance above the £85,000 FSCS cap and want simple, liquid, no-market-risk government backing.
• You are a basic-rate taxpayer with no ISA capacity, no PSA used, and a horizon under 3 years (Direct Saver is competitive once tax is netted out).
• You specifically want lottery-style prize variability with no downside (Premium Bonds for £25-£50,000).
• You need true instant access at face value with no possibility of a market-price drawdown — a real consideration for emergency cash.
• You want simplicity over basis points and the friction of running a brokerage account is a deal-breaker.

Hold both when different pots of money serve different jobs. A reasonable allocation for a UK saver with £100k of liquid assets in mid-2026:

• Emergency fund (3-6 months expenses): NS&I Direct Saver or a top easy-access account. Capital certainty matters more than 50bps of yield.
• 1-3 year savings goals: short gilts inside ISA (if available), or NS&I Direct Saver if PSA is unused and ISA is taken.
• 3-5 year goals: discount gilts inside or outside ISA depending on tax band; Green Savings Bonds only for basic-rate savers with no PSA spare.
• Long-term (7y+): 10-year and 30-year gilts inside SIPP/ISA. The current real yields are the best government-backed deal in over a decade.
• Above-FSCS-cap cash that genuinely needs to stay in cash: NS&I, every time.

The headline thesis: NS&I has been quietly shifting from "competitive savings hub" to "safety wrapper for above-cap balances and small lottery players." The April 2026 prize-fund cut is the data point that confirms it. Gilts have been moving the other way — from "too low to bother with" in 2021 to "the best government-backed real yield in a generation" today. If your money has a job that requires more than 12-24 months of duration, the centre of gravity of the smart UK saver portfolio has shifted from NS&I to gilts. Use NS&I deliberately, where its specific properties (capital certainty, above-FSCS backing, tax-free Premium Bond prizes for very large holdings) are the actual point — not as the default.