During bull markets, almost every investor makes money. If your portfolio is up 18% over the past two years, it is easy to assume your research, stock picking, and market timing were successful. But what if a simple, zero-effort investment in the FTSE Global All Cap Index or MSCI World would have returned 24% over the exact same period with zero trading effort?
The only way to know for certain is to compare like for like: the same deposits, on the same dates, going into a passive tracker instead of your actual trades. That comparison is what the Do Nothing Test gives you.
1. What is the 'Do Nothing' test?
The Do Nothing Test is Omnicogi's benchmarking methodology. Instead of comparing your portfolio against a static percentage benchmark line, Omnicogi constructs a parallel synthetic ledger:
For every deposit, withdrawal, or cash injection you made into your real broker accounts, Omnicogi assumes that exact pound amount was automatically invested into a low-cost global tracker fund on the exact same date.
By comparing your actual portfolio valuation against this synthetic counterpart, Omnicogi calculates your True Benchmark Gap (Alpha) in pure pounds sterling.
This isn't a verdict on whether active investing is "wrong" — plenty of investors pick stocks for reasons beyond raw return (interest, conviction, concentration they're comfortable with). It's simply a way to see the actual pound cost or benefit of that choice, rather than guessing from a headline percentage.
2. Decomposing your return: Alpha vs Beta vs Friction
Active investors can face hidden drags that erode performance without appearing on standard broker charts:
- FX & Spreads Drag: Frequent trading of US equities incurs 0.15% to 0.99% FX conversion fees on both entry and exit, acting as an invisible performance tax.
- Cash Drag & Timing: Holding uninvested cash while "waiting for a dip" can mean missing some of the market's strongest compounding days — though it can also avoid buying right before a drawdown, which is why this cuts both ways over different periods.
- Single-Stock Concentration: Idiosyncratic risk from holding individual equities that underperform the diversified broader market — the flip side being that concentration is also how stock-pickers can beat the index, not just lag it.
3. TWR vs XIRR benchmark gap analysis
Omnicogi calculates the benchmark gap using both mathematical frameworks:
- Time-Weighted Return (TWR) Gap: Measures your pure asset selection ability against the index, completely isolated from when you deposited money.
- Money-Weighted Return (XIRR) Gap: Measures your overall wealth generation, reflecting both your asset picks and your contribution timing.
Example: 3-Year Active Portfolio vs 'Do Nothing' Benchmark
| Strategy | Clean Cash Invested | Current Valuation | Personal XIRR | Generated Alpha |
|---|---|---|---|---|
| Actual Portfolio (Active Picks) | £45,000 | £53,200 | 8.4% | — |
| Synthetic 'Do Nothing' (MSCI World) | £45,000 | £58,900 | 12.1% | −£5,700 Drag |
In this scenario, active trading generated an illusion of £8,200 in profit, but cost the investor £5,700 compared to doing nothing with a passive global fund. In other periods — particularly ones where a handful of individual stocks outperform the broader index — the same test can show positive alpha instead. The point of the benchmark is to measure it, not to assume the answer in advance.
Important notice: Omnicogi is an independent financial analytics tool, not an investment adviser. The 'Do Nothing' benchmark is a mathematical backtest for educational and performance-tracking purposes. Past benchmark performance is not a guarantee of future returns. Always conduct thorough research and consult an FCA-regulated financial adviser before altering your investment strategy.