After-tax return
What is After-tax return?
After-tax return is the investment return remaining after taxes attributable under a defined investor, account, period, and calculation method.
Performance systems should state whether taxes are actual, accrued, estimated, liquidation-based, or based on a standardized hypothetical investor. The same portfolio can have many after-tax returns because investors have different bases, cash flows, rates, accounts, elections, and loss offsets. Comparisons require one consistent convention.
Attribution should separate taxes generated by portfolio activity from taxes caused by client withdrawals or legacy positions, enabling fairer evaluation of manager decisions and implementation.
Why results differ
Tax depends on investor residence, entity type, account wrapper, basis, holding period, income, gains, losses, withholding, elections, and rates. Two investors holding the same fund can earn the same pre-tax return and different after-tax returns. Standardized fund measures can support comparison but do not predict every investor's actual outcome.
Calculation approaches
Actual after-tax return uses paid and accrued taxes associated with real cash flows and lots. A liquidation method also assumes positions are sold at period end. Standardized methods apply hypothetical rates and distribution assumptions. Each should identify whether taxes on unrealized gains, carryforwards, foreign credits, and state or local liabilities are included.
Tax drag
Tax drag is the difference between pre-tax and after-tax performance under the method. It can arise from income, distributions, realized gains, turnover, withholding, and loss timing. A negative drag can occur temporarily when harvested losses create assumed benefits. Results are path-dependent and cannot be recovered by multiplying total return by one tax rate.
Portfolio use
After-tax analysis supports security and fund selection, asset location, lot choice, transition, withdrawal, donation, and manager evaluation. Compare alternatives at equal risk and after all costs. A tax-efficient strategy can underperform before tax or carry unintended factor exposure. The objective is better investor outcome, not the smallest current tax bill in isolation.
Practical reporting
State investor profile, jurisdiction, tax year, rates, account, lot method, liquidation assumption, loss use, withholding recovery, fees, and data coverage. Show pre-tax return and tax components alongside the net result. Preserve actual and hypothetical measures separately. Avoid presenting an estimate as filing advice or comparing managers under inconsistent tax assumptions.
Sources and further reading
- Capital Gains and Losses, Internal Revenue Service
- Dividends and Other Distributions, Internal Revenue Service