Inflation and What It Does to Your Money
Inflation is the reason a savings account paying 3% while prices rise 4% is quietly losing you money every year.
Key points
- Inflation compounds, so modest rates cause large losses of purchasing power over decades.
- Your personal inflation rate depends on what you actually buy.
- Cash loses real value reliably; it is still the right home for short-term money.
- Fixed-rate debt is eroded by inflation, which works in a borrower's favour.
The arithmetic
At 2.5 % inflation, £10,000 left untouched for twenty years still says £10,000 and buys what £6,103 buys today. Nothing was taken; the money simply bought less each year.
The rule of 70 gives a quick sense of scale: divide 70 by the inflation rate to get the years for prices to double. At 3 %, about 23 years. At 7 %, about ten.
Your rate is not the headline rate
Published inflation measures a basket representing average consumption. Your spending is not average, and the difference can be substantial.
If a large share of your budget goes on rent, energy and food, you have probably experienced inflation well above the headline figure in recent years. If you own your home outright and spend proportionally more on electronics and travel, you may have experienced less — electronics routinely fall in price.
This matters for planning. A retiree whose spending is dominated by heating and healthcare faces a different inflation rate from a household with a fixed-rate mortgage and a commute. Using the national figure for a personal projection can be misleading in either direction.
What has kept pace
| Asset | Historical behaviour against inflation |
|---|---|
| Cash savings | Usually below it — reliable real loss over long periods |
| Index-linked bonds | Designed to track it directly |
| Conventional bonds | Poor during unexpected inflation |
| Equities | Good over long periods, poor during inflation shocks |
| Property | Broadly tracks over long periods, with high transaction costs |
| Gold | Very long-run store of value, highly volatile over shorter ones |
The important nuance on equities: they have historically outpaced inflation over decades, because companies can raise prices. They do not protect against inflation in the short term — 2022 saw both equities and bonds fall while inflation rose.
None of this means cash is wrong. Money needed within a few years belongs in cash regardless of what inflation does to it, because the alternative risk is worse. It means cash is a poor home for long-term savings.
Inflation and debt
Inflation transfers wealth from lenders to borrowers, and this is the one place where it works in your favour.
A £200,000 mortgage fixed at 3 % is repaid in money that buys progressively less. After ten years of 3 % inflation, the real value of the outstanding balance has fallen by about a quarter, while your nominal wages have likely risen. The debt has been eroded without you paying a penny extra.
This only applies to fixed-rate debt. Variable-rate debt typically reprices upward as central banks raise rates to combat inflation, which removes the benefit entirely and often makes things worse.
The practical implications: during inflationary periods, fixed-rate long-term debt on an appreciating asset is comparatively advantageous, while holding large cash balances is comparatively costly. Neither is a reason to abandon an emergency fund or to borrow more than you can afford.
Frequently asked questions
Should I keep money in cash at all?
Yes, for anything you need within a few years, and for your emergency fund. Cash loses purchasing power slowly and predictably; investments can lose a third of their value quickly and unpredictably. Match the asset to the timeframe.
Why does official inflation feel lower than my experience?
Because the basket is an average and your spending is not. Housing, energy and food have risen faster than the headline rate in many recent periods, and these dominate lower-income budgets disproportionately.
Do wages keep up with inflation?
Sometimes, with a lag, and not reliably. Real wages — wages adjusted for inflation — have fallen during several recent periods in many countries. This is why a pay rise below the inflation rate is a real-terms pay cut.