What cash savings are
In brief: Cash savings accounts pay interest that is taxable above your Personal Savings Allowance. FSCS protection covers up to £85,000 per institution. Over long periods, inflation tends to erode the real value of cash — which makes cash most useful for short-term needs, emergencies, and specific purposes rather than as a long-term retirement asset.
Cash savings are deposits held in bank accounts, building society accounts, or National Savings & Investments (NS&I) products. They pay interest — either at a variable rate that changes with base rate movements, or a fixed rate locked in for a term.
Unlike investments, cash deposits do not grow or fall in value (in nominal terms). This predictability makes cash the foundation of emergency funds and a useful tool for short-term goals — but it also means cash is exposed to inflation risk over longer periods.
Interest rate types
Variable rate accounts — Current accounts, easy-access savings accounts, and notice accounts typically offer variable rates. When the Bank of England base rate rises, variable-rate accounts often (though not always) follow. In low interest rate environments, variable-rate accounts may pay near zero.
Fixed-rate bonds — You lock your money away for a defined term (typically 1-5 years) at a fixed interest rate. Fixed-rate bonds generally offer higher rates than easy-access accounts because you cannot access the money during the term without penalty. They provide certainty about the return but no flexibility.
Notice accounts — You must give notice (e.g., 30 or 90 days) before withdrawal. Rates are typically higher than easy-access but lower than fixed-rate bonds.
FSCS protection
The Financial Services Compensation Scheme (FSCS) protects cash deposits in UK-authorised banks, building societies, and credit unions. The current limit is £85,000 per person per institution.
This means:
- If your bank fails, you are protected up to £85,000 per person
- Jointly held accounts are protected up to £170,000 (£85,000 per person)
- If you hold accounts with multiple banks, each is protected separately — but accounts with banks that share a banking licence (for example, Halifax and Bank of Scotland) share a single £85,000 limit
For temporary high balances (such as proceeds from a property sale or a redundancy payment), FSCS protection extends to £1,000,000 for up to six months. This is automatic and does not require registration.
FSCS does not protect NS&I accounts — but NS&I is backed directly by the UK government, making it safer than FSCS-protected accounts in practice.
The Personal Savings Allowance
Interest earned on cash savings is taxable as income. However, the Personal Savings Allowance (PSA) allows you to earn a certain amount of interest tax-free each year:
| Tax band | Personal Savings Allowance |
|---|---|
| Basic rate taxpayer | £1,000 |
| Higher rate taxpayer | £500 |
| Additional rate taxpayer | £0 |
Interest above your PSA is taxed at your marginal income tax rate (20%, 40%, or 45%). This means higher earners with significant cash holdings can face meaningful tax bills on interest income.
There is also a Starter Rate for Savings — if your total income (excluding savings interest) is below £17,570, you may qualify for a 0% savings rate on up to £5,000 of interest. This is most relevant for retirees living primarily on savings who have little other income.
Cash ISAs hold interest tax-free regardless of income level and do not affect your PSA.
Inflation drag: the erosion of real value
The most significant risk for long-term cash savers is inflation. If inflation runs at 3% and your cash earns 2%, the real purchasing power of your savings falls by approximately 1% per year.
Over 20 years, a 1% annual real loss reduces purchasing power by roughly 18%. Over a 30-year retirement, persistent inflation drag on a large cash holding can significantly reduce what that cash can actually buy.
This is why financial planning typically distinguishes between:
- Nominal value: the pound amount in the account
- Real value: what that amount can actually purchase, adjusted for inflation
A cash savings pot that grows from £100,000 to £130,000 over 10 years looks like a gain — but if inflation has run at 4% per year over the same period, the real value has fallen. The money buys less than it did at the start.
When cash makes sense
Cash savings are not inherently the wrong choice. They serve specific, important purposes:
Emergency fund — Financial planning commonly suggests holding 3-6 months of expenditure in an easily accessible cash account. This protects against unexpected expenses or income disruption without forcing the sale of investments.
Short-term goals — If you need money within 1-3 years (a planned purchase, a holiday, a home improvement), cash avoids the risk of having to sell investments when their value may be lower than expected.
De-risking near drawdown — As you approach retirement, holding 1-3 years of living expenses in cash (or near-cash) allows you to avoid selling investments during a market downturn in the early years of drawdown — sometimes called a cash buffer or bucket strategy.
Fixed-income alternatives — In high interest rate environments, short-duration fixed-rate bonds can offer attractive risk-adjusted returns compared to bonds and other fixed income instruments.
NS&I products
National Savings & Investments (NS&I) is government-backed, making deposits effectively risk-free. Key products include:
- Premium Bonds: Instead of interest, your money is entered into a monthly prize draw. Prizes are tax-free. The prize fund rate (equivalent interest rate) varies but is typically competitive with easy-access savings. No guarantee of returns — you may win more or less than the equivalent interest rate.
- NS&I Income Bonds: Variable rate, easy access, interest paid monthly
- NS&I Direct Saver: Variable rate, easy access
- NS&I Guaranteed Growth Bonds / Guaranteed Income Bonds: Fixed-rate, fixed-term products. Not always available — issued in tranches.
- NS&I Junior ISA: Cash ISA for under-18s
NS&I products are not covered by FSCS (they are backed by HM Treasury directly), but they have no deposit limit for protection purposes.
Cash in a retirement projection
When modelling retirement income, cash savings typically serve as a buffer or a reserve rather than a primary income source. The real return on cash over long periods is often close to zero or negative, which means heavy reliance on cash in a long retirement creates meaningful longevity risk — the risk of the money running out.
A balanced approach commonly includes some cash for short-term needs and emergencies, with longer-term income drawn from pension drawdown, ISAs, and investment portfolios where real returns have historically been higher.
These projections are for modelling purposes only. They do not constitute financial advice. Tax rules are subject to change. Please consult a qualified financial adviser before making financial decisions.