Closing Monthly Recurring Revenue
The recurring monthly subscription revenue from all active contracts on the last day of a period, after every new sale, expansion, downgrade, and cancellation has flowed through the waterfall.
◆ Currency
Formula
Built from
What it measures
The sum of every active recurring subscription's normalized monthly value as of the final day of a reporting period. Built as a waterfall: the prior period's closing balance plus inflows (new customer contracts and expansion amendments) minus outflows (downgrades and cancellations). Each contract's MRR is calculated as Total Contract Value (TCV) divided by contract term in months. One-time setup fees, professional services, and usage overages are excluded — only revenue you can reliably expect to repeat each month from standing contracts.
Why it matters
Closing MRR is the period-end snapshot you anchor everything to: it is the recurring run-rate the business carries into the next month, the foundation for ARR and retention math, and the figure your board reads first. Investors weight it heavily because recurring revenue is predictable and far more valuable than one-time sales. Critically, this period's closing MRR becomes next period's Starting MRR, so it is both the result of one waterfall and the opening position of the next — get it wrong and every downstream number drifts.
How to read it
Read closing MRR as a trend, never as an isolated number. Compare this period's close to the prior period's close and to your plan or forecast. Positive movement means new and upsell revenue are outrunning downsells and churn; flat or negative means the leaks are larger than the inflows. Always decompose the change into its five components to diagnose *why* it moved — two companies closing at the same $100K MRR can have opposite trajectories if one is expanding and the other is replacing churned logos with a few large new accounts. If closing MRR is rising while new-customer additions are flat, expansion is carrying the growth and concentration risk is climbing. Pair closing MRR with net revenue retention and customer churn to judge the quality of the growth, not just its direction.
What good looks like
Good
Closing MRR growing month-over-month, with new and upsell revenue consistently outpacing downsell and churn, and customer churn below 5% monthly.
Watch
Closing MRR flat or growing unevenly; downsell or churn trending up; growth dependent on a handful of large accounts or volatile new additions.
Bad
Closing MRR declining or stagnating; churn and downsells outrunning new and upsell revenue; the customer base shrinking.
Watch-outs
- Treating closing MRR as a starting or aggregate number. It is specific to a single period-end and becomes the Starting MRR of the next period — do not sum closing balances across months or annualize one without intent.
- Counting non-recurring fees as MRR. Setup fees, one-time price hikes, professional services, and usage overages are not recurring — folding them into the close inflates the run-rate and breaks month-to-month comparability.
- Ignoring the waterfall components. A flat closing balance can mask a churn crisis — $15K new offsetting $15K churn nets $0 growth but signals an unstable base. Always read all five flows.
- Double-counting amendments. If a customer upgrades mid-month, add only the incremental MRR from the effective date forward, not a full month of both the old and new amounts.
- Misdating last-day contracts. A contract whose billing begins on the 1st of the next month belongs in next period's New MRR, not this period's close, even if it was signed on the 30th.
Worked example
Hypothetical
A SaaS company opens January at $100K MRR. During the month it signs $12K of new contracts, existing customers expand by $4K, one customer downgrades by $2K, and $3K is lost to churn. Closing MRR for January is $111K — which becomes the Starting MRR for February. If February then adds $5K new and loses $1K to churn with no expansion or downgrades, February's closing MRR is $115K.