Why not just subtract inflation from the nominal return?

Subtraction is an approximation. The correct formula is (1 + nominal) ÷ (1 + inflation) − 1. The difference matters when rates are high — e.g. 10% nominal − 5% inflation ≠ 5% real (it's actually 4.76%).

Should I include the management fee?

Yes, always. A 1% annual fee on a 7% fund leaves you with 6% — and compounded over 30 years, it can cost 20–25% of your final balance.

● Inflation-adjusted return

Real Return Calculator

Q: Can my real return be negative?

Yes. If inflation exceeds your net return (after fees and taxes), you lose purchasing power even while nominally gaining. The calculator flags this with a warning.

Q: What inflation rate should I use?

Use the current CPI rate for your country (e.g. US CPI, EU HICP) or the central bank's target rate for long-term planning. The field is free so you can enter any scenario.

Find out how much purchasing power you actually gain — after inflation, taxes, and management fees.

A 10% nominal return with 4% inflation and 20% tax leaves you with a real gain of only about 4.0% — not 6%. This calculator applies Fisher's equation to show your true return precisely.

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Real Return Calculator

Nominal rate · Inflation · Tax · Management fee

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Your inputs

Nominal return rate

% /yr

Inflation rate — enter your country's CPI

% /yr

Tax on gains (0 if tax-exempt)

Management fee (ETF TER, fund expense ratio)

% /yr

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Results

Gross nominal return

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After management fee

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After tax on gains

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Inflation rate

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Real return (purchasing power gain)

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How it's calculated

Fisher's equation: the correct way to calculate real return

Subtracting inflation from your nominal rate is only an approximation. The precise formula — Fisher's equation — divides the net return by the inflation factor:

Net return = Nominal − Fee − (Nominal − Fee) × Tax rate Real return = (1 + Net return) ÷ (1 + Inflation) − 1 Example: 8% nominal, 0.2% fee, 15% tax, 3% inflation Net = 8% − 0.2% − (7.8% × 15%) = 8% − 0.2% − 1.17% = 6.63% Real = (1.0663) ÷ (1.03) − 1 = 3.52%

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Deduct management fee
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2
Deduct tax on gains
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3
Apply Fisher's equation
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Nominal return: The stated rate before adjusting for inflation or taxes.
Real return: The gain in actual purchasing power — what matters for your standard of living.
Fisher equation: (1 + nominal) ÷ (1 + inflation) − 1. More accurate than simple subtraction.
Management fee / TER: Annual cost charged by a fund or ETF (Total Expense Ratio). Reduces your effective return before taxes.

Disclaimer: estimation tool for planning. Tax treatment varies by country and investment type. Consult a tax adviser for your specific situation.

Frequently asked questions

Why not just subtract inflation from nominal return?

Subtraction is an approximation. At 10% nominal and 5% inflation, simple subtraction gives 5% — but the correct Fisher equation gives 4.76%. The difference is small at low rates but significant at high inflation environments.

Can my real return be negative?

Yes. If inflation outpaces your net return, you lose purchasing power even if your account balance grows. This is called "losing to inflation" and affects savings accounts in high-inflation periods.

What inflation rate should I use?

Use your country's official CPI (US: Bureau of Labor Statistics; EU: Eurostat HICP; UK: ONS; India: MoSPI). For long-term planning, central bank targets (typically 2%) are common. You can also enter a personal inflation estimate based on your spending.

Does management fee apply before or after tax?

Fees are deducted from your return before the gain is calculated for tax purposes. A 0.2% fee on a 8% fund leaves 7.8% — and tax applies to the 7.8% gain, not the original 8%.