Every deal summary carries both numbers, and most readers quietly favor one without deciding to. It is worth deciding to, because the two metrics reward different things, disagree in predictable situations, and the disagreement is usually the most informative line on the page.
IRR rewards speed. It is a time-weighted measure, so capital returned early counts enormously, and a deal that hands money back fast can post a spectacular IRR on a modest profit. Equity multiple rewards magnitude and ignores the clock entirely: two times your money is two times your money whether it took three years or ten. Put a short flip next to a long compounder and the metrics will rank them in opposite order, both correctly, because they are answering different questions. IRR asks how hard each dollar worked while it was in the deal. The multiple asks how much you actually made.
Where each one lies is the useful knowledge. IRR flatters brevity: a high IRR on a short hold can describe a profit too small to have been worth the effort, and it silently assumes the returned capital redeploys at a similar rate immediately, which is the assumption real life most often breaks. Whoever cannot redeploy is holding cash earning nothing while the IRR in the deck earns applause. The multiple lies in the other direction: it flatters patience indiscriminately, blind to the difference between doubling in four years and doubling in twelve, and a big multiple over a long enough hold can conceal a mediocre annual rate.
So the question 'which to trust' resolves into a question about you. Capital that redeploys easily, a machine with deal flow, favors IRR, because speed genuinely compounds for you. Capital that is scarce, slow to place, or meant to sit, a personal balance sheet, a family's money, favors the multiple, because the clock costs you less than the redeployment gap does. And in every case, read the pair together: a high IRR with a thin multiple is a sprint, a fat multiple with a low IRR is a slow march, and the deal's honest character lives in the combination, not in either number alone.
The widget below is a single-cash-flow sketch: set the equity, the profit, and the years, and watch IRR decay as the hold stretches while the multiple stands still. That divergence is the entire lesson in one slider. Real deals distribute cash across the hold, refinance capital out mid-stream, and settle at an exit, which is why their true IRR is a schedule question no napkin can answer. PropCalc™ computes both metrics off the full monthly distribution schedule, so the pair you present to an investor describes the deal's actual shape. Present the pair. Anyone who shows you only one has chosen it for a reason.