Your portfolio vs the MSCI World: the fair comparison

“Am I ahead of the market?” is where most portfolio comparisons start — and the wrong first question. Before it can be answered meaningfully, three technical questions need settling: which index is the right yardstick, in which variant, and with which definition of return? Skip those three and you are comparing apples with exchange rates. This article walks the fair route: time-weighted returns (TWROR), a shadow portfolio with identical cashflows, and a list of the mistakes that occur most often in practice — with one fully worked example.

What the MSCI World actually is — as of June 2026

The MSCI World covers large and mid-cap companies across 23 developed markets. Per the MSCI factsheet as of 30 June 2026, it contains 1,283 constituents and covers roughly 85% of the free-float market capitalisation of each country. “World” deserves a literal-minded footnote: the United States accounts for 72.45% of the index, Japan 5.69%, the United Kingdom 3.45%, Canada 3.34%, France 2.4%. The ten largest positions — led by Nvidia at 5.18% — together weigh 25.74%. Emerging markets are absent entirely; that is what the MSCI ACWI adds. Measuring a portfolio against the MSCI World therefore mostly means measuring it against US mega-caps — not an argument against the index, but a property worth knowing when interpreting any difference.

Choosing the comparison index follows one guideline: the yardstick should represent the universe the portfolio actually invests in. A globally diversified equity portfolio pairs naturally with the MSCI World or ACWI; a portfolio with a deliberate emerging-markets allocation pairs better with the ACWI or a 70/30 combination. The one hard rule: the index is chosen in advance and not switched afterwards — a yardstick picked to fit the result measures nothing.

How large is the index-choice effect in practice? Usually smaller than assumed — and still noticeable in individual years. In 2025, measured in euros, the MSCI World returned +7.21% and the MSCI ACWI +8.33% — a good percentage point apart, because emerging markets gained +18.46% in euros that same year (all gross return, MSCI EUR factsheet as of 30 June 2026). In 2024 the order reversed: World +27.15%, ACWI +25.90%. Choosing between the two yardsticks therefore moves the result by tenths up to single percentage points per year — relevant for interpretation, but no reason to swap the chosen index once the result stops being flattering.

Why contributions distort every naive comparison

An index has no savings plan. Its level is a pure price series, and its annual return is time-weighted by construction: it measures what an amount invested at the start of the year would have become, with no money flowing in or out. A real portfolio receives fresh money continuously — savings-plan executions, lump sums, occasional withdrawals. Every one of those bookings changes the base on which returns compound. Divide end value by start value and you count contributions as gains. Divide profit by capital paid in and you weight late contributions as heavily as early ones, although they had far less time in the market. Both numbers are legitimate quantities on their own — but neither is comparable to an index return.

The worked example makes it concrete — all figures invented and deliberately round: a portfolio starts on 1 January with €10,000. By 30 June it has grown to €11,000 (+10%). On 30 June, €5,000 of fresh money arrives; the portfolio stands at €16,000. By 31 December it grows another 10% to €17,600. The profit is €2,600 on €15,000 paid in — a “simple return” of +17.3%. The time-weighted return instead chains the two half-years: 1.10 × 1.10 − 1 = +21.0%. The gap of almost four percentage points exists solely because the €5,000 could only compound for half the year. Only the 21.0% is comparable to an index return over the same year — because only it answers the same question: how did one euro develop that was invested the whole time?

That is why the time-weighted rate of return (TWROR) is the standard for benchmark comparisons: it neutralises the timing of cashflows and measures pure investment performance. The money-weighted return (IRR) answers the other, equally important question — how did my euros do, timing included? — but it cannot serve as an index comparison, because the index never sees your timing.

The savings-plan method: one cashflow stream, two portfolios

There is a second, very tangible way to compare fairly: the shadow portfolio. Take your exact cashflows — every contribution with its date — and compute what the same amounts would have become in an MSCI World index fund: each contribution notionally acquires index units at that day's level, each withdrawal releases units. At the end, two final values sit side by side that experienced the identical contribution history — which makes the comparison automatically fair, no TWROR formula required.

In the worked example above: assume the benchmark gains +8% in the first half-year and +6% in the second (invented numbers again). The shadow portfolio: €10,000 × 1.08 = €10,800, plus the €5,000 contribution = €15,800, × 1.06 = €16,748. The real portfolio stands at €17,600. The difference: +€852 — or, expressed as TWROR, +21.0% against +14.5%, i.e. +6.5 percentage points. Stated that way, the comparison stays a measurement: a difference with a sign and a unit, not a verdict.

Step by step: computing the comparison yourself

1. Export your data. The basis is the complete transaction history with the date and amount of every contribution. At most brokers that is a CSV export — for Trade Republic we have documented the exact path.
2. Cut the timeline into sub-periods. Every contribution and withdrawal slices the time axis. For each sub-period: return = end value ÷ (start value + inflow at the start of the period) − 1.
3. Chain them. Multiply the sub-period returns: (1 + r₁) × (1 + r₂) × … − 1. The result is the portfolio's TWROR over the full period.
4. Put the benchmark next to it. For the identical period, take the return of an MSCI World net total return series in your home currency — or use an accumulating index fund as the reference series, which already includes replication costs.
5. Record the difference. As a number with a date and a period: “difference vs benchmark over 24 months: +1.8 pp” is a usable observation. “I am doing great” is not.

The four most common comparison mistakes

1. Ignoring contributions. The mistake from the worked example — end value over start value, or profit over contributions, set against a time-weighted index return. The larger the savings rate relative to portfolio value, the larger the distortion — in both directions.

2. The wrong index variant. Every MSCI index exists in three return variants: price (levels only, dividends excluded), gross total return (dividends fully reinvested) and net total return (dividends reinvested after withholding tax). The MSCI World's dividend yield stood at 1.52% per the factsheet of 30 June 2026 — set a dividend-inclusive portfolio against a bare price index and you gift yourself roughly one and a half percentage points a year, a very large effect over a decade. European UCITS index funds typically track the net variant; it is also the consistent choice for a portfolio comparison.

3. Forgetting the currency. Same index, same year, two different worlds: in 2025 the MSCI World returned +21.60% in US dollars but only +7.21% in euros (both gross return; USD factsheet, EUR factsheet, as of 30 June 2026). A gap of over 14 percentage points — exchange rate alone. A euro-denominated portfolio belongs against the euro series of the index; otherwise the comparison mostly measures the dollar.

4. Letting periods and cut-off dates slip. Portfolio at month-end against index at mid-month, or a since-inception portfolio figure against a five-year index return: even small date mismatches manufacture phantom differences. Both series need exactly the same start and end date — and the same treatment of costs. Your portfolio return is net of order fees; an index is free. The clean fix is to benchmark against the price series of a real index fund, which includes its ongoing charges.

What a difference means — and what it does not

Suppose the clean measurement comes out at −2.3 pp over two years. That is a data point, not a judgement of skill. Over short horizons, chance dominates: a few percentage points of difference across one or two years sit comfortably inside the range that different sector weights produce on their own, without any special decisions. The difference becomes interesting only with context: did it come from a deliberate tilt (more Europe, less tech) or from single names? Did it arrive with more or less volatility than the index? And is it stable across years, or does it jump around? That is exactly why it pays to record the difference regularly — as a time series, not a one-off verdict. What the comparison does not yield is an instruction. From “−2.3 pp” no particular transaction follows — at most, a better question to ask of your own portfolio.

Making the comparison routine

Nothing in this arithmetic requires special software — a spreadsheet with the cashflows from your broker export is enough. The expensive part is the discipline of doing it regularly, with the same rules every time. That is where tooling helps: Acutic works from a CSV import with no bank connection and analyses the imported portfolio as a structure — weights, concentration, per-position metrics. How Acutic measures and discloses the historical performance of its own scoring methodology is documented on the performance page — the same logic this article applies to a portfolio: measure, document, add context, no verdicts.

The fair comparison is ultimately a habit: set it up cleanly once — right index, net total return variant in your home currency, TWROR instead of gut feeling — and then calmly collect the time series. Measured that way, you get a dataset about yourself instead of a headline. It is less spectacular. It is considerably more useful.

Further reading: Trade Republic CSV export: the 2026 guide — how the data for the comparison leaves the broker — and portfolio rules you actually keep — what a regularly measured difference can turn into: a documented rule. Create free account.

Acutic provides investment research and educational analysis under MAR Art. 20 / § 85 WpHG. Acutic does not provide investment advice (Anlageberatung per § 1 Abs. 1a S. 2 Nr. 1a KWG / Art. 4(1)(4) MiFID II), portfolio management, or any other licensed investment service. No content in this article constitutes a personal recommendation.