Inflation Hits 3.5%: What It Means for Your Savings

Inflation rose to 3.5% in the year to September, up from 3.1% in August. That’s the highest reading in almost a year. If your savings are earning less than that, they’re losing value, even while the balance keeps creeping up.

I look at savings rates for a living, and the number I always measure them against isn’t the top of the best-buy table. It’s inflation. A 4% account sounds decent until prices are rising at 3.5% and you’re paying tax on the interest.

So here’s what today’s figure means in practice: what it costs you to do nothing, the rate you actually need to beat (it’s probably higher than 3.5%), and whether to fix now or wait for the Bank of England.

The numbers that matter today

• Inflation (CPI): 3.5%, up from 3.1%

• Bank Rate: 3.75%, next decision 5 November

• Average easy access rate: around 2.5%

• Best one-year fixed rates: just over 5.1%

Why inflation jumped

Fuel did most of the damage. Motor fuel prices were 29.8% higher than a year earlier, the steepest annual rise since August 2022, because the conflict in the Middle East is keeping oil prices high.

The more worrying part for the Bank of England is core inflation, which strips out energy, food, alcohol and tobacco. That edged up to 2.8%. It’s a sign that higher costs are starting to spread beyond the petrol pump.

It may not be the peak either. The Bank itself expects inflation to climb above 4% in the first few months of 2027.

What 3.5% inflation does to £10,000

This is the simplest way I know to show it. Here’s £10,000 left for a year at different rates, with prices rising 3.5%. That knocks about £350 off what the money will buy.

Before tax, and assuming inflation holds at 3.5% for the year.

The gap between an average account and a top fix is £260 a year on £10,000. That’s the cost of leaving money where it is.

The rate you need to beat depends on your tax band

This is the bit most inflation coverage skips. 3.5% is only the real target if your interest is tax-free, either inside an ISA or within your personal savings allowance. That allowance is £1,000 of interest a year for basic-rate taxpayers, £500 for higher-rate and nothing for additional-rate.

Once you’re past it, you need a higher rate just to stand still:

Gross rate needed on interest above your allowance. Tax on savings interest rises by two percentage points from April 2027.

Here’s the uncomfortable part. Say you’re a higher-rate taxpayer and you’ve already used your £500 allowance. None of today’s best easy access accounts or fixed bonds beats inflation after tax. A 5.1% fix works out at around 3.06% once 40% tax comes off.

The allowance also goes quicker than people think. At 5%, a basic-rate taxpayer uses up £1,000 of interest with about £20,000 saved. A higher-rate taxpayer hits £500 at around £10,000.

That’s why cash ISAs matter so much right now. The best one-year fixed cash ISA pays 4.98% tax-free at the time of writing, which clears 3.5% whatever your tax band. You can compare cash ISA rates here, or run your own numbers through our savings tax calculator.

Will the Bank of England raise rates?

Probably, and soon. Bank Rate has sat at 3.75% since December 2025, but three of the nine Monetary Policy Committee members already voted for a rise to 4% in September. After today’s figures, markets see a November hike as close to certain. The decision is due on 5 November.

For savers that’s broadly good news, but it won’t land evenly:

• Easy access rates should follow base rate up, but usually slowly and not always in full. Tracker accounts move automatically. Most others move when the provider decides it needs your money.

• Fixed rates have largely moved already. They’re priced off swap rates, which reflect where markets think base rate is heading, so the expected rise is mostly baked in. According to Moneyfacts, the average one-year fix has climbed to 4.41%, its highest since September 2024. Leading one- to five-year fixes are above 5% for the first time since December 2023.

You can see how savings rates have tracked Bank Rate and inflation over time on our savings rate tracker.

Should you fix now or wait?

It’s the question that always comes up just before a rate decision. My honest view: if you’ve got money you won’t need for a year, waiting for 5 November isn’t the free option it looks like.

Because a hike is already priced in, the announcement itself may only nudge fixed rates up a touch. The outlook could also shift the other way: the conflict eases, oil falls and inflation fears fade. If that happens, fixed rates can drop quickly, and the best deals tend to get pulled with little warning. Missing a few basis points is a smaller risk than missing a 5% fix altogether.

If you can’t decide, split it. Fix some now, keep some flexible, and reassess after the Bank’s decision.

Compare all one-year fixed rate bonds

Where your easy access money should sit

Your emergency fund still belongs in easy access, just not in an account paying 2.5%. Before you move it, check two things.

Is the headline rate propped up by a bonus? A lot of the top easy access rates right now are. The best rate on the market is 5%, but nearly two percentage points of that is a six-month bonus. Once it ends, you’re back to around 3%, which is below inflation. Put the end date in your calendar the day you open the account.

Are there withdrawal limits? Limited access accounts pay a bit more but cap how often you can take money out. That’s fine for a buffer you rarely touch, but not ideal for a genuine emergency fund.

If you can live with giving notice, notice accounts sit in between. They pay up to 4.75% on accounts with more than 180 days’ notice.

Compare all easy access accounts

Two things to sort before April

Use this year’s ISA allowance. You can still put the full £20,000 into a cash ISA this tax year. From 6 April 2027, under rules announced in last year’s Budget, under-65s will be capped at £12,000 a year in cash. Over-65s keep the full £20,000. This year’s Budget lands on 28 October, so keep an eye out for changes, but I wouldn’t plan around the cap disappearing.

Check when your fix pays out. Interest is taxed in the tax year you receive it. A one-year fix opened now that pays interest on maturity will pay out in autumn 2027, after the new 22%, 42% and 47% rates kick in. Picking monthly interest means some of it lands before April. Holding the fix inside an ISA means it doesn’t matter at all.

Check your FSCS protection

The FSCS protects up to £120,000 per person, per banking licence, not per brand. Some brands share a licence, so two accounts with sister brands may only be covered once. If you’re above that limit, NS&I is fully backed by the Treasury. Its one-year British Savings Bond now pays 4.99% after this month’s rate rise.

What I’d do this week

• Check what you’re actually earning. If it’s under 3.5%, your money is shrinking in real terms.

• Find your real break-even. Use your tax band from the table above, not the headline inflation figure.

• Move your emergency fund out of anything paying around the average, and note any bonus end date.

• Compare fixes now if you’ve got cash you won’t touch for a year, rather than waiting for 5 November.

• Set a rate alert so you hear about it when providers react to the Bank’s decision.

The next inflation figures, for October, are out on 18 November.

Rates correct at the time of writing on 21 October 2026. This article is for information only and isn’t financial advice.