Annual run rate annualises a recent period of revenue — latest month times twelve, or latest quarter times four — into a full-year figure.
Annual run rate = revenue in period × (12 ÷ months in period) — e.g. latest month × 12, or latest quarter × 4
Your latest month brought in £85,000 of total revenue, of which £70,000 was recurring subscriptions.
£85,000 × 12 = £1.02M annual run rate (while Annual Recurring Revenue is £70,000 × 12 = £840,000)
Annual run rate (ARR, confusingly) takes a recent period of revenue and extrapolates it to a full year, on the assumption that the current pace holds. Take the latest month and multiply by twelve, or the latest quarter and multiply by four, and you have an annualised picture of where the business is running right now.
Despite sharing an acronym, annual run rate is not the same as Annual Recurring Revenue. Annual run rate can be built from any revenue — including one-off fees, usage, and services — whereas Annual Recurring Revenue counts only contractually recurring subscription revenue. A business with lumpy consulting income can have a large annual run rate but a much smaller Annual Recurring Revenue. We avoid the "ARR" abbreviation for this term precisely because it collides with the recurring-revenue meaning.
Run rate is a quick, blunt instrument. Its strength is speed — you get an annual figure from one month of data — and its weakness is that it assumes the period you picked is representative. Annualise a strong month and you overstate; annualise a seasonal trough and you understate. It is most reliable for steady subscription businesses and least reliable where revenue is seasonal or one-off heavy.
Run rate gives you an annual frame from the most recent data, which is invaluable for fast-moving early-stage businesses where last year tells you little about this year. The catch is that it is only as honest as the period behind it — annualising an unrepresentative month produces a confident-looking number that misleads, so it pairs best with a clear view of recurring versus one-off revenue.
There is no benchmark for the run-rate figure itself; the discipline is in the input. In 2025-2026 this has become a live integrity issue — TechCrunch and investors documented AI startups annualising a single strong month, a free pilot, or volatile usage revenue and presenting it as "ARR", with some headline run-rate claims (e.g. a publicised 50 million dollars against roughly 42 million actual) materially overstating real paying revenue, so a run rate is only as honest as the representative, recurring-heavy period behind it. (Source: TechCrunch, May 2026; Stripe; Baremetrics.)
Not quite. Annual run rate annualises any recent revenue, including one-off and usage income. Annual Recurring Revenue counts only recurring subscription revenue. They share the "ARR" acronym, which is why we spell out annual run rate to avoid confusion.
Whenever the chosen period is not representative — a seasonal peak or trough, or a month carrying a one-off fee. Annualising it projects that anomaly across the whole year and over- or understates the true pace.
Use the most recent period that is genuinely representative — usually the latest full month or quarter. A single month is the most volatile input, so a trailing quarter (revenue times four) smooths out one-off spikes; for fast-growing businesses an even shorter, very recent window better reflects current pace, but only if no hero deal or promotion is distorting it.
MRR is the actual monthly recurring revenue you are billing right now; annual run rate is a projection that scales a recent period up to a year. Multiplying MRR by twelve gives an annualised recurring run rate, but run rate can also be built from total revenue including one-off and usage income, whereas MRR is recurring-only and is not itself a forecast.
Run rate assumes the period you annualise repeats, but usage-based and AI pricing is volatile and not locked into contracts, so a strong month can be a spike rather than the new baseline. This is exactly how some 2025-2026 AI startups overstated 'ARR' — annualising a single big month or pilot — which is why annualised run rate should never be confused with contracted recurring revenue.
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