What Is MRR vs ARR? What MSPs Actually Need to Track Before a Sale
MRR and ARR are used interchangeably in most MSP conversations. They shouldn't be. Here's the operational and diligence-grade difference — and why buyers care about the distinction.
George Fassett, Jr. · July 13, 2026
Every MSP owner knows the acronyms. Most use them interchangeably. Buyers don't. Here is the difference that matters and where it shows up in real dollars.
The Definitions
- MRR (Monthly Recurring Revenue). Contractually recurring revenue you will collect this month, holding the current book constant. If a customer is on a signed MSA at $8,000/month, they contribute $8,000 to MRR.
- ARR (Annual Recurring Revenue). MRR × 12, expressed annually. Same underlying book, different lens.
Both should exclude one-time projects, hardware pass-through, break-fix, and anything that isn't on a signed multi-period agreement.
Why the Distinction Matters
- MRR is the operating dial. It's the number your service delivery, staffing, and cost-to-serve are sized against month to month.
- ARR is the diligence lens. Buyers, banks, and PE sponsors underwrite against ARR because it strips out the seasonality noise of a single month.
- Growth math changes. A 10% MRR growth in a single month is not 120% ARR growth — the compounding math only works if the growth is sustained.
Where MSPs Get This Wrong
- "MRR" that includes project revenue. If a $30K server refresh gets amortized across three months and reported as MRR, the number lies to you and to the buyer.
- ARR calculated from a peak month. ARR should reflect the trailing-run-rate book, not the best month of the year.
- Handshake customers in MRR. Recurring only counts if it is contractually obligated. Verbal renewals are not MRR.
- Ignoring gross vs net. Net Revenue Retention (renewals + expansion − churn − downgrades) is what buyers actually price. A high MRR with 20% annual gross churn masks a leaking bucket.
What Buyers Actually Model
Buyers rebuild your ARR from signed contracts, discount unsigned "verbal" recurring, apply a churn assumption from your historical data, and then apply a multiple. Owners who present a clean, contract-derived ARR at diligence get better outcomes than owners who present a headline number that unwinds under scrutiny.
Mebuis engagements for MSP owners preparing for sale rebuild the recurring book, convert handshake customers to signed MSAs, and produce diligence-grade ARR reporting. Book an operator alignment call.
Frequently Asked Questions
- What is the difference between MRR and ARR?
- MRR is Monthly Recurring Revenue — contractually recurring revenue collected in a single month. ARR is MRR × 12, expressed annually. Same underlying book, different lens. Buyers underwrite against ARR; operators run their business on MRR.
- Should project revenue count in MRR?
- No. MRR is contractually recurring revenue only. One-time projects, hardware pass-through, and break-fix work should be reported separately. Mixing them inflates MRR and unwinds at diligence.
- What is Net Revenue Retention and why does it matter?
- Net Revenue Retention is renewals plus expansion minus churn and downgrades. It is what buyers actually price because it shows whether the recurring bucket is leaking. A high MRR with 20% gross churn hides a real problem.
- Do handshake customers count as MRR?
- No. Recurring revenue only counts if it is contractually obligated on a signed multi-period agreement. Verbal renewals do not survive diligence and should not appear in MRR reporting.