What is inflation?
Inflation is a general rise in prices over time. The practical effect is that each dollar buys slightly less than it did the year before. At 3% annual inflation, something costing $100 today would cost roughly $134 in ten years and $181 in twenty.
It directly affects the real value of savings, the effective cost of a mortgage, superannuation projections, and the burden of indexed debt.
Inflation vs cost of living
The two terms are often used interchangeably, but they measure different things.
| Inflation | Cost of living |
|---|---|
| Economy-wide price increases | Depends on an individual's own spending |
| Usually measured using the CPI | Can differ significantly between households |
| Affects the economy broadly | May rise faster or slower than inflation |
A retiree spending heavily on healthcare and a young renter spending heavily on housing can experience very different cost-of-living pressure even when headline inflation is identical, because the CPI basket reflects average spending, not any one household's.
How inflation affects Australians
The practical impact depends heavily on your financial position. A few common scenarios:
Savers
Cash sitting in a low-yield account loses purchasing power if its interest rate trails inflation. The balance grows, but what it can buy may not.
Renters
Rents can rise faster than headline inflation in tight rental markets, adding direct pressure to household budgets at lease renewal.
Mortgage holders
Inflation and interest rates are closely linked in general terms, since the RBA uses the cash rate as a lever to help manage inflation, which can flow through to variable mortgage repayments.
Investors
Broad share market investments have historically delivered real returns above inflation over long periods, one reason long-term investors treat equities as a partial inflation hedge.
Retirees
A fixed retirement income buys less each year under inflation, which is why benchmarks like the ASFA Comfortable Retirement Standard are updated annually to keep pace.
How Australia measures inflation
The Australian Bureau of Statistics (ABS) tracks inflation using the Consumer Price Index (CPI). The CPI measures price changes across a representative basket of goods and services (housing, food, transport, healthcare, education, and other categories) and is published quarterly.
The Reserve Bank of Australia (RBA) targets an inflation rate of 2–3% per year on average over the economic cycle. This is a medium-term objective, not a hard limit for any single year. Interest rate decisions are the RBA's primary tool for influencing where inflation sits.
Australian inflation timeline
Headline inflation (annual CPI) has moved significantly over the past few years. A brief, factual look at why:
2020
Inflation was unusually low, briefly negative in parts of the year, as COVID lockdowns suppressed demand and some temporary government support measures reduced measured prices.
2021
As the economy reopened, demand recovered faster than supply chains could adjust, and inflation climbed toward the upper end of the RBA's target range by year's end.
2022
Inflation surged to its highest level since the early 1990s, driven by global energy price shocks, ongoing supply chain disruption, and strong demand. Annual CPI peaked at around 7.8% in the December quarter.
2023
Inflation remained elevated but began easing from its peak as supply pressures faded and higher interest rates worked through the economy.
Today
Inflation has continued to moderate since the 2022 peak. The exact current rate changes every quarter, check the ABS Consumer Price Index release for the latest figure.
Source: Australian Bureau of Statistics, Consumer Price Index.
Real vs nominal returns
A nominal return is the raw percentage gain before adjusting for inflation. A real return shows what was actually gained in purchasing power after accounting for price rises.
If a savings account earns 4% per year and inflation runs at 3%, the real return is approximately 1%. The balance grows in dollar terms, but purchasing power increases only slightly.
More precisely, the real return is: (1 + nominal) / (1 + inflation) − 1. At small numbers, subtracting the inflation rate from the nominal return is a reasonable approximation.
The difference between real and nominal matters most for long-term projections. A superannuation balance projected to reach $1.5 million in 30 years is expressed in future (nominal) dollars. In today's purchasing power at 2.5% average inflation, that same amount is equivalent to roughly $720,000, still significant but considerably less than the headline figure suggests.
Inflation and savings accounts
Cash savings earn interest, but inflation erodes the purchasing power of that cash. In periods where savings rates lag behind inflation, cash holdings lose real value even as the nominal balance grows.
This does not mean cash savings are pointless. Emergency funds and short-term savings serve genuine purposes regardless of real returns. But over long periods, heavy reliance on cash savings alone may not keep pace with the rising cost of living.
Inflation and debt
Inflation affects debt differently from savings. If a mortgage is $500,000 and wages and prices rise with inflation, the real burden of those repayments gradually falls over time, as the same nominal payment represents less purchasing power each year.
Not all debt benefits from inflation this way. HECS-HELP debt is indexed each year by whichever is lower, CPI or wage growth, meaning the balance tends to rise with inflation rather than being eroded by it. In years of elevated inflation the lower-of rule limits how much a balance can grow: the 7.1% that the old CPI-only rule produced for 2023 was retrospectively replaced with 3.2%.
Inflation and superannuation
Super projections (from fund statements, calculators, and financial models) typically show nominal balances at retirement. The real (inflation-adjusted) value depends on how inflation tracks over the intervening years.
A projection of $1.2 million at retirement in 30 years, at 2.5% average inflation, is worth roughly $575,000 in today's purchasing power. Comparing a projected super balance to today's living costs requires accounting for this gap. They are not directly comparable figures.
This is why benchmarks like the ASFA Comfortable Retirement Standard are updated annually. The target rises with inflation to maintain its real-world meaning.
The purchasing power halving time
Using the Rule of 72: divide 72 by the inflation rate to estimate how long it takes for purchasing power to halve. At 3% inflation, purchasing power halves in roughly 24 years. At 2%, it takes about 36 years.
For someone 25 or 30 years from retirement, this is a meaningful number. The retirement income that feels adequate today will need to be considerably higher in nominal terms to buy the same goods and services in the future.
Inflation in everyday life
$100 from several years ago does not buy what $100 buys today. That gap is purchasing power lost to inflation, and it shows up most clearly in everyday spending:
Groceries
Coffee
Fuel
Utilities
See it with your own numbers
Exact prices change every quarter, so rather than a fixed example that goes stale, use the Inflation Calculator to enter any past amount, whether it's a weekly grocery bill or a full year's budget, and see exactly what the equivalent purchasing power is today.
Common inflation myths
"Inflation means everything increases equally." False.
The CPI basket covers dozens of categories, and individual prices move at very different rates. Fuel and energy are typically far more volatile than categories like education or health insurance.
"Falling inflation means prices are falling." False.
Falling inflation (disinflation) means prices are still rising, just more slowly. Prices actually falling is deflation, a much rarer and generally unwelcome scenario for an economy.
"Cash always loses value to inflation." Not necessarily.
If your savings rate is higher than inflation, purchasing power still grows, just more slowly than the nominal balance suggests. Real value is only lost once the interest rate trails inflation.
"Inflation is always bad." Not quite.
Moderate inflation within the RBA's 2-3% target is considered economically healthy. It encourages spending and investment over hoarding. Very high or unpredictable inflation is the actual problem, not steady, moderate price growth.
"My super projection is already in today's dollars." False.
Almost all super projections show nominal future dollars unless explicitly stated otherwise. The headline figure will look larger than what it can actually buy at retirement.
Continue learning
How Compound Interest Builds Wealth Over Time
Beginner's Guide to ETF Investing in Australia
Dollar-Cost Averaging Explained
Financial Independence, Retire Early (FIRE) in Australia
Retirement Income in Australia
Understanding Salary Sacrifice in Australia
Frequently asked questions
What causes inflation?
Inflation is generally driven by a mix of demand and supply pressures: strong consumer demand outpacing supply, rising business costs (wages, energy, imported goods) being passed on in prices, and global factors like oil price shocks or supply chain disruption. The RBA does not set individual prices directly, it manages the cash rate to influence overall demand in the economy, which in turn affects how quickly prices rise.
Why does inflation matter?
Inflation determines how far your income and savings actually stretch. Wages, super balances, and cash savings are only genuinely growing if they outpace inflation, otherwise the nominal number rises while real purchasing power stays flat or falls. It also affects borrowing costs, since the RBA adjusts the cash rate partly in response to inflation.
Is inflation the same as the cost of living?
No, though the two are related. Inflation is an economy-wide average measured by the CPI. Cost of living is personal, it depends on what you actually spend money on. Someone spending heavily on categories rising faster than the CPI average (rent in a tight market, for example) can feel a cost-of-living squeeze even when headline inflation looks moderate.
How does inflation affect long-term investment returns?
Broad share market investments have historically delivered real returns above inflation over long periods. Nominal returns from equities tend to incorporate inflation expectations through earnings and dividend growth over time. This is why diversified share investments are often discussed as a long-term inflation hedge, though short-term volatility is significant and past performance is not a guarantee.
Should I adjust my savings goal for inflation?
If your savings goal is a fixed amount in today's dollars, yes. A $50,000 emergency fund goal in five years needs to account for the fact that $50,000 will buy less in five years than it does today. Increasing the nominal target by the expected inflation rate each year keeps the real goal intact.
What is the difference between CPI and underlying inflation?
The headline CPI captures all price changes including volatile items like food and energy. The RBA also monitors "trimmed mean" inflation, which strips out the most volatile price movements to give a cleaner picture of underlying demand-driven inflation. Both measures are published by the ABS.
Official sources
- Australian Bureau of Statistics - Consumer Price Index, Australia
- Reserve Bank of Australia - what inflation is and how the RBA manages it
Looking for just the key figures? See the Inflation & CPI quick-reference sheet.