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Tax research and calculator notes
2025 Inflation Tax Calculator: Purchasing-Power Loss on Cash
Calculate the 2025 inflation tax on cash and unindexed nominal balances using annual-average CPI-U, with a conventional formula, historical comparison, and primary sources.
Updated · No credentialed tax review is claimed.
Direct answer
TrueTaxRate calculates inflation tax as the annual CPI-U purchasing-power loss rate multiplied by the average balance held in cash and unindexed nominal assets. For 2025, the annual-average CPI-U values in the model imply a 2.56% loss in a dollar's purchasing power, so a $5,000 average exposed balance produces an estimated $128 inflation tax.
Calculate inflation tax on your money balance
Enter the average balance you held throughout 2025. A practical approach is to average monthly ending balances across cash, checking, and other fixed-dollar accounts that were not indexed to inflation.
Estimated 2025 inflation tax
$128
$5,000 × 2.56%
Sources for this table: International Monetary Fund: Fiscal Accounting and Analysis; Bureau of Labor Statistics: purchasing power and constant dollars.
Definition and formula
The inflation tax is an implicit burden on holders of money balances when government-related money creation contributes to inflation and each dollar buys less. In the conventional public-finance formula cited by the IMF, the inflation rate is applied to the stock of real cash balances held by the public. TrueTaxRate implements that household-side calculation with annual-average CPI-U.
Inflation tax = average exposed money balance × [1 − prior-year CPI-U / current-year CPI-U]
BLS annual-average CPI-U values are used so the rate describes the purchasing power retained by one dollar across the annual comparison. The amount is not applied to gross income, annual spending, stocks, real estate, or inflation-indexed assets.
Historical inflation-tax comparison for the same balance
Holding the money balance constant isolates the effect of the observed CPI-U loss rate. These years match the historical comparison years available in TrueTaxRate; they are not a continuous time series.
| Year | Prior CPI-U | Current CPI-U | Dollar loss rate | Inflation tax |
|---|---|---|---|---|
| 1964 | 30.625 | 31.017 | 1.26% | $63 |
| 1986 | 107.567 | 109.608 | 1.86% | $93 |
| 1993 | 140.317 | 144.458 | 2.87% | $143 |
| 2001 | 172.200 | 177.067 | 2.75% | $137 |
| 2010 | 214.537 | 218.056 | 1.61% | $81 |
| 2018 | 245.120 | 251.107 | 2.38% | $119 |
| 2020 | 255.657 | 258.811 | 1.22% | $61 |
| 2022 | 270.970 | 292.655 | 7.41% | $370 |
| 2025 | 313.689 | 321.943 | 2.56% | $128 |
Sources for this table: Bureau of Labor Statistics: purchasing power and constant dollars; Bureau of Labor Statistics CPI calculation. Amounts are direct calculations from the displayed CPI-U values and the entered balance.
Interpret the result carefully
The economic idea is often described as a hidden transfer because unexpected inflation reduces the real value of nominal balances and can reduce the real value of government liabilities. This calculator does not estimate seigniorage, monetary financing, or how much purchasing power the government received. It measures the household-side loss on the balance entered.
Interest can offset some loss, and taxes on interest can reduce that offset. A separate real-return analysis would be needed for an interest-bearing account. The most defensible input here is the balance actually exposed to fixed-dollar purchasing-power loss.
Read the full inflation-tax methodologyInflation-tax questions
What is the inflation tax?
The conventional inflation tax is the purchasing-power loss borne on real money balances when inflation reduces what cash and unindexed fixed-dollar assets can buy. It is an implicit economic burden, not a tax line on Form 1040.
What balance belongs in an inflation-tax calculator?
Use the average amount held during the year in cash, checking, non-interest-bearing deposits, and other unindexed nominal balances. Exclude stocks, real estate, and inflation-indexed securities.
Does this calculation prove that government money creation caused all inflation?
No. Monetary expansion and government finance are part of the inflation-tax concept, but CPI changes can have multiple causes. This calculator measures the purchasing-power loss on the entered balance and does not estimate government revenue or claim one cause for all price changes.
Calculation assumptions and limits
These are reproducible educational scenarios, not a quote, filing result, or advice. Federal, state, local, capital-gains, credits, AMT, payroll, sales, and gas inputs use 2025 source coverage. The latest complete owner-occupied property-tax observations used here are from 2024, and the renter model combines those rates with 2025 housing data. Source vintages are identified beside each table. Enter actual values in the calculator when you have them.
Read the full methodologyPrimary sources
- International Monetary Fund: Fiscal Accounting and Analysis — Defines the conventional inflation-tax component as the inflation rate multiplied by the stock of real cash balances held by the public.
- Bureau of Labor Statistics: purchasing power and constant dollars — Primary methodology for converting annual-average CPI-U values into the purchasing power retained by one dollar.
- Bureau of Labor Statistics CPI calculation — Primary methodology for CPI-U and annual-average index calculation.