Fidelity XIRR: How to Measure Your Real Portfolio Return

Fidelity displays both "Personal Rate of Return" (a modified Dietz calculation) and time-weighted returns depending on where you look. Neither is XIRR.

The Personal Rate of Return approximates a money-weighted return but uses beginning and ending values rather than solving for the precise rate across all dated cash flows. For accounts with large mid-period deposits or withdrawals, this approximation diverges meaningfully from XIRR — sometimes by several percentage points over a 5-year holding period.

Fidelity users often hold both active accounts and workplace retirement accounts (401k, IRA). The performance of each is reported in isolation, making it hard to understand your aggregate return across all accounts and contribution timing.

Most importantly: if you increased contributions during a market dip or held a large cash position during a bull run, these decisions significantly affect your true return — but Fidelity's dashboard doesn't surface this clearly.

Fidelity lets you download full transaction history from the "Accounts & Trade" section. You can export individual or combined accounts as a CSV, including all deposit, withdrawal, buy, sell, dividend, and interest records.

XIRR Auditor automatically parses Fidelity's standard CSV format — including RSU vest transactions from Fidelity's equity compensation platform — and computes your true money-weighted return.

With your XIRR computed, you can compare your actual return against the period-matched return for a low-cost index fund like SPY or a total market fund. This answers whether active fund selection, individual stock picks, and timing decisions have added or subtracted value over your investing period.

For many Fidelity investors with long histories, the difference between XIRR and the displayed return can reveal years of silently missed performance.