What Is Inflation? A Clear Guide to Understanding Rising Prices in the UK

Inflation data changes over time, and past trends do not guarantee future outcomes. Nothing in this article constitutes personal financial advice. For decisions about your own circumstances, consider speaking with a qualified adviser.

Inflation Definition: What Does Inflation Actually Mean?

Inflation is the rate at which prices for goods and services rise over time. When inflation occurs, each pound buys slightly less than it did before. Think of it as the gradual erosion of money’s purchasing power.

If a loaf of bread costs £1 today and inflation runs at 3% over the next year, that same loaf might cost around £1.03 in 12 months. Multiply this effect across thousands of products and services, and you begin to see how inflation shapes the cost of living.

Inflation is not inherently good or bad. Moderate price increases often accompany a healthy, growing economy. Problems tend to arise when inflation runs too high, too low or becomes unpredictable. Central banks, including the Bank of England, try to keep inflation stable so households and businesses can plan ahead with reasonable confidence.

How Is Inflation Measured in the UK?

The UK uses several indices to track price changes. Each captures a slightly different picture of living costs, which is why you may hear different inflation figures quoted in the news.

CPI, CPIH and RPI Explained

The Consumer Prices Index (CPI) is the headline measure used by the government and the Bank of England. It tracks price changes for a representative basket of goods and services that a typical household might buy. This basket is updated each year to reflect changing spending habits and includes 760 items in 2026.

CPIH builds on CPI by including owner-occupiers’ housing costs. These costs attempt to capture what homeowners would pay to rent their own property, making CPIH a broader measure of housing-related expenses.

The Retail Prices Index (RPI) is an older measure. It uses a different calculation method and includes mortgage interest payments. Many people still encounter RPI because some contracts, pensions and rail fare increases remain linked to it. However, the Office for National Statistics (ONS) has stated that RPI does not meet international standards and should be used with caution.

Sources: ONS methodology for CPI/CPIH and ONS guidance on RPI; Bank of England CPI target

Understanding what RPI inflation is helps when you encounter contracts or index-linked products that still reference it. The difference between RPI and CPI can be meaningful, sometimes more than a full percentage point.

The Role of the ONS

The ONS is responsible for collecting price data and publishing inflation figures each month. ONS staff and volunteers visit shops, supermarkets and websites across the UK to record prices. They also gather data on services such as haircuts, cinema tickets and broadband packages.

This painstaking work produces the monthly inflation statistics that shape interest rate decisions, wage negotiations and benefit adjustments.

What Causes Inflation?

Economists broadly group the causes of inflation into two categories. Both can operate at the same time, and untangling their effects is rarely straightforward.

Demand-Pull Inflation

Demand-pull inflation occurs when spending in the economy outpaces the supply of goods and services. When consumers and businesses want to buy more than producers can deliver, sellers often raise prices.

Several factors can fuel demand. These include rising wages, low interest rates that encourage borrowing, increased government spending or a surge in consumer confidence. If supply cannot expand quickly enough to meet this demand, prices climb.

A simple example: if everyone suddenly wants to buy the same model of car and factories cannot build enough, dealers may raise prices because buyers are competing for limited stock.

Cost-Push Inflation

Cost-push inflation starts on the supply side. It happens when the cost of producing goods and services increases, and businesses pass those higher costs on to customers.

Common triggers include rising energy prices, more expensive raw materials, supply chain disruptions or higher wages that are not matched by productivity gains. When oil prices spike, for instance, transport costs rise, which can push up the price of almost everything that travels by road, rail or sea.

The UK experienced significant cost-push pressures in recent years as global energy prices rose sharply and supply chains faced disruption.

Types of Inflation

Beyond the demand-pull and cost-push distinction, economists describe inflation in terms of severity and duration.

Most developed economies aim to maintain creeping or very low walking inflation. The UK’s post-war experience has generally fallen within these ranges, though the 1970s saw periods of much higher inflation.

What Is the UK Inflation Target?

The Bank of England has a formal mandate to keep inflation at 2%, as measured by CPI. This UK inflation target is set by the government and forms the centrepiece of UK monetary policy.

Why 2% rather than zero? A modest positive target provides a buffer against deflation, which can be difficult to escape once it takes hold. It also gives the Bank room to cut interest rates during downturns without immediately hitting zero.

When inflation drifts more than one percentage point above or below the 2% target, the Governor of the Bank of England must write an open letter to the Chancellor explaining why and what the Bank intends to do about it. This accountability mechanism keeps monetary policy transparent.

The Bank’s main tool for influencing inflation is the base interest rate. Raising rates tends to cool spending and borrowing, which can dampen price rises. Lowering rates does the opposite, encouraging economic activity.

Current UK Inflation Rate and Recent Trends

Inflation in the UK rose sharply during 2022 and into 2023, driven largely by surging energy prices and global supply chain pressures. At its peak, CPI inflation reached levels not seen for decades.

More recently, inflation has moderated as energy prices stabilised and some supply constraints eased. However, services inflation has proven stickier, reflecting strong wage growth in parts of the economy.

For the most up-to-date figures, the ONS publishes CPI and CPIH data monthly on its website. Checking the publication date ensures you are working with current information, as these numbers can shift meaningfully from month to month.

Past inflation trends do not reliably predict future outcomes. The path of prices depends on a wide range of factors, many of which are difficult to forecast.

How Inflation Can Affect You

The effects of inflation touch nearly every aspect of personal finance. Understanding these impacts helps you think clearly about your own situation, even if this article cannot offer advice tailored to your circumstances.

Savings: If the interest rate on a savings account is lower than the inflation rate, the real value of your savings falls over time. Your balance may grow in nominal terms while buying less in practice.

Wages: When prices rise faster than wages, your standard of living can decline even if your pay cheque stays the same. Conversely, wage increases that outpace inflation can improve purchasing power.

Borrowing: Fixed-rate borrowers may benefit during high inflation because they repay loans in money that is worth less than when they borrowed. Variable-rate borrowers, however, often face higher interest payments as central banks raise rates to combat inflation.

Pensions and benefits: Some pensions and state benefits are linked to inflation measures. The link used (CPI, RPI or another index) affects how much income rises each year.

UK Inflation Forecast: What Experts Are Watching

Forecasting inflation is notoriously difficult. Central banks, research institutions and private economists all produce projections, but these are educated estimates rather than certainties.

The Bank of England publishes its own inflation forecast in the quarterly Monetary Policy Report. These projections include fan charts that illustrate the range of possible outcomes, acknowledging the inherent uncertainty.

Analysts currently watch several factors closely:

• Energy prices, which can shift rapidly due to geopolitical events

• Wage growth, particularly in sectors with labour shortages

• Global supply chain conditions

• The lagged effects of previous interest rate changes

• Government fiscal policy decisions

Some forecasts indicate inflation could moderate toward the 2% target, but outcomes are highly uncertain. Unexpected shocks, whether from energy markets, geopolitics or domestic policy, could push prices in either direction.

Any forecast may not materialise. Treat projections as one input among many rather than a reliable guide to what will happen.

Key Takeaways

• Inflation is the rate at which prices rise over time, eroding the purchasing power of money.

• The UK measures inflation primarily through CPI and CPIH, published monthly by the ONS.

• Demand-pull inflation stems from excess spending; cost-push inflation arises from rising production costs.

• The Bank of England targets 2% CPI inflation to maintain price stability.

• Inflation affects savings, wages, borrowing costs and pension income in different ways.

• Forecasts are uncertain. Past trends do not guarantee future outcomes.

For the latest inflation data, visit the ONS website and note the publication date. Understanding how inflation is measured in the UK and what drives it can help you interpret economic news and think more clearly about your own financial decisions, even if it cannot tell you precisely what to do.

This article is for general educational purposes only and does not constitute personal financial advice. Inflation data can change, and you should verify current figures from official sources before making decisions.