What Is Inflation and Why Does It Matter?

Context: why inflation became everyone's problem

For a generation, inflation was a distant, technical concept that rarely troubled ordinary households. That changed abruptly in 2022, when prices rose at the fastest rate in four decades and "cost of living" became the dominant story in British politics and personal finance alike. Understanding inflation — what it is, what drives it, and why central banks respond the way they do — went from an economics-textbook curiosity to essential knowledge for making sense of mortgage costs, pay negotiations, savings decisions and government policy. It remains one of the most consequential forces in anyone's financial life, even now that the acute spike has passed.

The data: what inflation is, and how high it went

Inflation is the rate at which the general level of prices rises over time, meaning each pound buys a little less than before. In the UK it is measured mainly by the Consumer Prices Index (CPI), which tracks the changing cost of a representative basket of hundreds of goods and services. When CPI inflation is 3%, prices are on average 3% higher than a year earlier. Crucially, inflation measures the pace of price rises, not the level of prices — so even when inflation falls, prices are usually still rising, just more slowly.

The 2022 episode put the concept in stark relief. UK CPI inflation peaked at 11.1% in October 2022 — the highest rate in 41 years:

The spike was driven primarily by a surge in wholesale energy prices following Russia's full-scale invasion of Ukraine in February 2022, compounded by post-pandemic supply chain disruption and strong demand. Because energy and food feed into the cost of nearly everything, the shock rippled across the whole economy.

What's changing: from crisis to a slow return toward target

Inflation has fallen substantially from its 2022 peak, as energy prices eased and the Bank of England's interest rate rises worked through the economy. The Bank's response illustrates how modern inflation control works: it raised Bank Rate — the interest rate that influences borrowing and saving costs across the economy — to a peak of 5.25% in 2023, making borrowing more expensive and saving more rewarding to cool the demand that was pushing prices up. Having held rates there while inflation fell, the Bank began cutting from August 2024. The government sets the Bank a target of 2% CPI, and the Bank's job is to use interest rates to keep inflation close to it over the medium term.

"The thing most people miss is that falling inflation doesn't mean falling prices — it means prices are rising more slowly. When inflation drops from 10% to 3%, the cost of living is still going up, just less steeply. Prices very rarely fall back to where they were." — a clarification the Bank of England itself stresses in its public explainers.

What it means for you

Inflation touches nearly every financial decision you make. It erodes the real value of cash savings: money earning 2% interest while inflation runs at 4% is losing purchasing power even as the balance grows, which is why leaving large sums in a low-interest account is quietly costly over time. It affects wages: a 3% pay rise when prices rise 5% leaves you worse off in real terms, which is why "real" (inflation-adjusted) figures matter more than headline ones. And it shapes borrowing costs, since the Bank's response to inflation moves mortgage and loan rates. Understanding inflation helps you make better decisions — from pushing for a pay rise that at least matches it, to choosing savings accounts and investments that stand a chance of preserving your money's real value. Our companion explainers on how UK inflation is actually measured and what drove the cost of living crisis go deeper on the mechanics and the human impact.

It also helps to understand the two broad forces that drive inflation, because they call for different responses. "Demand-pull" inflation happens when spending across the economy outpaces the supply of goods and services — too much money chasing too few products — and is the kind interest rate rises are best suited to cool. "Cost-push" inflation happens when the cost of producing things rises, as with the 2022 energy shock, and pushes prices up regardless of demand. The 2022 spike was largely cost-push, driven by energy, which is part of why it was so painful and why interest rates were a blunt instrument against it — raising borrowing costs does little to bring down the price of imported gas. A third factor, expectations, matters too: if workers and businesses expect high inflation to continue, they push for higher wages and set higher prices, which can make inflation self-perpetuating. Central banks watch expectations closely precisely because keeping them "anchored" near the target is part of how inflation is controlled.

What to watch next

Watch the monthly ONS CPI releases for whether inflation settles durably at or near the 2% target, or continues to run above it in specific categories — services inflation in particular has proven stickier than goods inflation across the disinflation process. Watch the Bank of England's interest rate decisions, since how fast it cuts Bank Rate depends heavily on whether it judges inflation to be genuinely under control, and those decisions directly affect mortgage costs and savings rates. And keep an eye on the distinction the Bank keeps stressing: a return to target inflation means prices stabilising their rate of increase, not falling back — so the higher price level reached during the 2022-24 spike is, for the most part, permanent, which is precisely why real wage growth over the coming years matters so much for household living standards.