Your savings rate is not Bank Rate. Why “3.75%” can still feel like losing money

Illustration only, published .

When the Bank of England holds Bank Rate at 3.75%, headlines make it sound as if households are earning something close to that on cash. Most are not. The useful comparison for a rainy-day pot is not Bank Rate versus your balance. It is what your account actually pays versus what prices are doing.

The inflation number that matters this month

The Office for National Statistics put Consumer Prices Index (CPI) inflation at 3.1% in the 12 months to August 2026, up from 2.9% in July. That is the official yardstick the Bank aims at 2%. Fuel was a big driver of the August rise. Core CPI (stripping out energy, food, alcohol and tobacco) was 2.6%.

So if your cash earned less than about 3.1% over that same year, and prices rose at CPI, the purchasing power of that pot fell even if the pound figure on the screen went up. That is the plain meaning of a negative real return. Tax on interest outside an ISA can widen the gap further.

Bank Rate held. Your account did not automatically follow

At its September meeting the Monetary Policy Committee voted 6–3 to keep Bank Rate at 3.75%. Three members wanted 4%. That decision sets the tone for lending and for what banks can afford to pay savers. It does not rewrite the rate on an Easy Saver you opened three years ago.

Moneyfacts data around late September 2026 shows how wide the cash market is:

  • Average easy-access savings rate: about 2.55% (on a £10,000 balance illustration).
  • A selection of flexible big-bank easy-access accounts: about 1.16% on average.
  • A selection of top easy-access deals from building societies: about 4.22% on average.
  • Market-leading easy-access deals: up to around 5.00% AER (often including time-limited bonuses).

So the ~2.5% figure is a market average, not “the” rate. Plenty of people sit below it on older high-street products. Plenty of shoppers sit above it on best buys. Shopping around (or not) is what changes the kitchen-table maths.

Cash ISAs follow the same split. Best-buy easy-access Cash ISAs have recently been advertised around the mid-4% AER range including bonuses, while average easy-access Cash ISA rates have sat lower. From April 2027 the Cash ISA subscription cap for under-65s falls to £12,000 (overall ISA limit still £20,000), which is a separate decision from whether today’s rate beats inflation. See The Cash ISA shrinks for under-65s. What April 2027 actually changes.

A simple real-return sketch (illustration only)

Take £10,000 left for a year:

  • At about 1.16% (big-bank style average in the Moneyfacts selection): roughly £116 interest before tax.
  • At about 2.55% (market average easy access): roughly £255.
  • At about 4.22% (top building-society selection average): roughly £422.

If prices rose 3.1% over the same stretch, the first two leave you behind in purchasing power before you even think about tax. The third can look ahead of CPI on a pre-tax, pre-bonus-expiry basis. None of those figures is a forecast. Rates change, bonuses fall away, and next month’s CPI will not be August’s 3.1%.

Outside an ISA, basic-rate savers may still owe tax once interest exceeds the Personal Savings Allowance. Higher-rate taxpayers feel that sooner. An ISA wrapper does not magically raise the rate. It can stop tax chewing the real return.

What to do at the kitchen table

  1. Check the AER on the account you actually use, not the Bank Rate graphic on the news.
  2. Compare it with the latest ONS CPI print and with current best buys, remembering bonuses and withdrawal rules.
  3. Keep enough genuinely accessible cash for emergencies. Chasing the top rate with money you may need next month is a different risk.
  4. Use a household snapshot to see cash buffer versus spending, not as advice to move providers. Money Engine’s free Financial Profile tool is illustration only.

The short read

Bank Rate 3.75% (held, September 2026). ONS CPI 3.1% (year to August 2026). Average easy-access rates sit near 2.5%, high-street selections can be far lower, and best buys (often with bonuses) can sit above CPI. Real return is interest after inflation, and after tax if you are outside an ISA. Confirm live ONS and provider rates before you move money.

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Sources

Disclaimer

Illustration only. Not savings, tax or regulated financial advice. Rates and inflation figures change. Confirm with ONS, the Bank of England and your provider before acting. Money Engine tools are for illustration.