Real Return After Inflation and Tax

The Real Return After Inflation and Tax calculator shows how much of an investment's stated return remains after accounting for taxes and inflation.

A nominal investment return can look attractive while the actual increase in purchasing power is much smaller. This calculator separates the effects of tax and inflation so you can see the return that remains in real terms.

Inputs

Nominal Return

The investment's stated annual return before tax and inflation.

For example, enter 8 pct/yr for an 8% annual return.

Tax Rate

The percentage of the nominal investment return that is paid as tax.

For example, 15 pct means that 15% of the nominal return is lost to tax.

This calculator uses a simplified return-tax model. It assumes that tax is applied directly to the investment return.

Inflation Rate

The annual rate at which prices increase.

For example, enter 3 pct/yr for 3% annual inflation.

Results

After-Tax Return

The nominal return remaining after tax:

After-Tax Return = Nominal Return × (1 − Tax Rate)

For example, with an 8% nominal return and a 15% tax rate:

After-Tax Return = 8% × (1 − 15%) = 6.8%

Real Return Before Tax

The nominal return adjusted for inflation, before considering tax:

Real Return Before Tax = (1 + Nominal Return) / (1 + Inflation Rate) − 1

This shows the approximate increase in purchasing power before tax.

Real Return After Tax

The key result is the return after both tax and inflation:

Real Return After Tax = (1 + After-Tax Return) / (1 + Inflation Rate) − 1

For example, with an 8% nominal return, 15% tax, and 3% inflation:

• After-tax return = 6.8%
• Real return after tax ≈ 3.69%

Thus, an investment earning 8% nominally produces a real after-tax return of about 3.69% under these assumptions.

Tax Impact

Shows the reduction in the nominal return caused by tax:

Tax Impact = Nominal Return − After-Tax Return

Inflation Impact

Shows the reduction when the after-tax nominal return is adjusted for inflation:

Inflation Impact = After-Tax Return − Real Return After Tax

Example

Suppose an investment has:

• Nominal return: 8 pct/yr
• Tax rate: 15 pct
• Inflation rate: 3 pct/yr

The calculator produces:

The Real Return After Tax is the most useful figure when the goal is to understand how much the investment increases purchasing power after both tax and inflation.

Important assumption

This calculator uses a simplified tax model in which the tax rate is applied directly to the nominal investment return. Actual investment taxation can be more complicated depending on the investment type, jurisdiction, holding period, deductions, exemptions, and whether tax is applied to interest, dividends, capital gains, or another form of income.

The result should therefore be treated as an estimate rather than a tax calculation.