IRR vs Time-Weighted Return (TWR): Key Differences Explained

IRR is a money-weighted return: it weighs each period by how much money was invested then. TWR gives every period the same weight. The table compares them on definition, what each answers, who uses it, legal and tax treatment, risk, liquidity and a typical example.

TWR breaks time into pieces. Each piece ends where money moves in or out. You measure the return of each piece, then chain them: (1 + r₁) × (1 + r₂) × … − 1. GIPS calls this geometrically linking the sub-period returns (GIPS 2020). Because every piece counts the same, the size of a deposit has no effect.

IRR works on the whole stream at once. You list every payment in and out, with its date. Then you find the one yearly rate at which their present values add up to zero. The steps, by hand and on a calculator, are in how to calculate IRR. Spreadsheets do it with XIRR, covered in IRR vs XIRR.

Same Holding, Two Investors

Here is an illustrative case. Two investors hold the same portfolio over two years. Each starts with $100,000 and adds $100,000 after the first year. Only the order of the good and bad year differs.

The portfolio did the same thing for both, so the TWR is the same: 3.9% a year. The money did not. Investor A added cash just before the bad year and lost $2,000. Investor B added it before the good year and made $28,000. Only IRR shows that difference.

The rule is about who controls the timing. GIPS, the performance standards of the CFA Institute, makes TWR the default. A firm may report a money-weighted return only if it controls the cash flows in and out. The fund must also be closed-end, have a fixed life, take fixed commitments or hold mostly illiquid assets (GIPS 2020).

A private fund fits that description. Its manager decides when to call your money through a capital call and when to pay it back. So its timing skill is part of the result, and IRR captures it. ILPA, a trade body for fund investors, puts net IRR at the top of its standard fund report (ILPA, 2025). In a mutual fund, investors buy and sell when they choose. The manager cannot control that, so TWR is the fair measure.

TWR is harder in private markets for a practical reason. It needs a value every time money moves. GIPS requires private holdings to be valued only quarterly, so a private TWR leans on estimates between those dates.

Neither return is a tax figure, and neither creates a tax. Taxes follow what actually happens: a sale, a dividend, a fund distribution. Both returns are usually shown before your personal taxes. A fund’s net IRR is after its fees and carry, still before your own tax bill.

If you want an after-tax view, IRR is the easier one to build. List your own cash flows, including the tax you paid on each distribution, and solve for the rate. For a US fund taxed as a partnership, the amounts come from your Schedule K-1, the yearly tax form it sends each partner. TWR has no natural place for taxes, because it ignores cash moving in and out.

It depends on the question. To judge your own result, use IRR. To judge a manager who does not control your timing, use TWR. An employee who buys company stock every payday, for example through an ESPP, faces the same split. The stock’s TWR shows how the shares did. Your own IRR shows how your purchases did.

IRR

For

It shows what your actual money earned. It credits a fund manager for good timing of calls and payouts. It is the standard for private funds and works with just your payments and a final value.

Against

It can rise through timing alone, such as a credit line. It counts unsold holdings as if they were cash. It mixes your decisions with the manager’s in a public fund.

Verdict: IRR is the measure for private funds, SPVs and your own portfolio. Read it net of fees and next to a multiple such as TVPI, which shows how much came back.

TWR

For

It isolates the manager’s investment skill from deposits and withdrawals. It lets you compare funds and benchmarks fairly. It is the GIPS default.

Against

It ignores what happened to your money. It needs frequent valuations, which private assets do not have.

Verdict: TWR is the measure for public funds and managers who do not decide when money moves. It can look good while your own account lost money, so check your personal IRR too.

Find out which return your statement shows before you compare two numbers. A private fund’s IRR and a public fund’s TWR answer different questions. Comparing them directly mixes timing with skill.

For a private fund, ask for the net IRR since inception, with and without the credit line. Read it next to DPI and TVPI. For a single-deal SPV, your IRR depends on when you paid in and when the company exits. The deal-level multiple is explained in MOIC.

Common Mistakes

• Comparing a fund IRR with an index returnThe index return is time-weighted. The gap includes timing, as well as skill.
• Blaming the fund for your timingIf you added money before a fall, your IRR is below the fund’s TWR. The fund did what its TWR says.
• Reading a private TWR as exactPrivate holdings are valued quarterly at most. The TWR between those dates is an estimate.
• Comparing gross with netBoth measures come gross or net of fees. Compare like with like.
• Ignoring the cashNeither return tells you how much has been paid back. Check distributions too.

IRR (internal rate of return)

The yearly rate at which the present value of all cash flows in and out equals zero. A money-weighted return.

TWR (time-weighted return)

A return built from period-by-period results, with the effect of deposits and withdrawals removed.

Money-weighted return

A return that reflects the change in value and the timing and size of cash flows. IRR is one.

External cash flow

Money that moves into or out of a portfolio from outside, such as a deposit, withdrawal, capital call or distribution.

Geometric linking

Chaining period returns by multiplying (1 + each return), then subtracting one.

GIPS

The Global Investment Performance Standards of the CFA Institute, a voluntary industry standard.

Net return

A return after the fees and expenses the investor paid.

TVPI

Total value to paid-in: a fund’s value per dollar investors paid in. It ignores time.

Standards and rules were last checked on November 9, 2026. GIPS and ILPA are industry standards without the force of law. The SEC Marketing Rule applies to US investment advisers. The two-investor example is illustrative and contains no market data.