Real Return After Inflation, Fees & Tax Drag Calculator
Real Return After Inflation, Fees & Tax Drag Result
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Versioned calculationFormula v1.0.0
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Calculated with the versioned 1.0.0 model.
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Method and test recordFormula v1.0.0
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- Not recorded
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- CalculatorGeek
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- Next source review
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- Definition fixtures
- 1 configured scenarios
- Published examples
- 1 shown below
Recorded method
No tool-specific review method has been recorded.
These records describe the published model and reference tests. A test-case count is not a certification of every possible input or an independent specialist review. Editorial policy
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Method sources
Reference inputs and expected results
Up to 12 examples from the configured definition fixtures are shown. Expected values use the stated output units; invalid inputs are intended to be rejected.
| Case | Inputs | Expected result |
|---|---|---|
| Reference case | Market and currency: us; Nominal annual return: 8 pct; Annual fees: 1 pct; Annual tax drag: 1 pct; Annual inflation: 3 pct; Starting amount: 100000 currency | Net nominal return: 6 %; Exact real return: 2.9126213592 %; Nominal amount after one year: 106000; Ending value in today’s purchasing power: 102912.62135922 (allowed numeric tolerance: 1.0E-6) |
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What this calculator answers
Real return measures purchasing-power change, not just the dollars shown on a statement. Fees and user-entered tax drag reduce nominal return before inflation is removed.
Separate nominal return from purchasing-power return using editable assumptions.
Method and calculation order
Net nominal return equals nominal return minus entered fees and tax drag. Exact real return is (1 + net nominal) ÷ (1 + inflation) − 1.
Worked reference example
An 8% nominal return minus 1% fees and 1% tax drag leaves 6%. With 3% inflation, exact real return is about 2.91%, not 3%.
How to use the result
Use after-fee numbers from disclosures and a tax assumption appropriate to the account. Test multiple inflation and return cases.
What the calculator cannot know
Tax drag is user-entered and simplified. The tool excludes cash-flow timing, volatility, losses, capital-gains realization, tax brackets and currency changes.
Frequently asked questions
Why not just subtract inflation?
Simple subtraction is an approximation; the exact ratio preserves compounding.
Can real return be negative?
Yes. Purchasing power falls when net nominal return is below inflation.
Primary sources and review status
- Investor.gov — Compound Interest Calculator
- Investor.gov — How Fees and Expenses Affect Your Investment Portfolio
- Investor.gov — Real Return
Sources and model boundaries checked 2026-10-08. This new opportunity-map expansion has automated formula, fixture and source QA but has not been represented as human editorial review. Keep the route noindex until CalculatorGeek records a completed YMYL editorial review.