Unit economics and finance
ARR, billings and cash
Four related top-lines — ARR, billings, collections and recognized revenue — that diverge when customers prepay.
Operators juggle four related top-lines. They are not interchangeable, and a "great quarter" of bookings can leave the company tighter than the quarter before.
| Metric | Meaning |
|---|---|
| ARR / MRR | Forward run-rate of subscription value |
| Billings | Amounts invoiced in the period |
| Collections / cash from customers | What actually hit the bank |
| Recognized revenue | GAAP P&L revenue |
Fast-growing annual-prepaid SaaS: billings > revenue, collections ≈ billings (if AR is tight), deferred revenue rises, cash looks better than the P&L. Shrinking or monthly-shift SaaS: the reverse — cash can worsen while the P&L still shows leftover deferred revenue unwinding into revenue.
Concept
ARR is a run-rate, not a bank deposit. Billings are invoices. Collections are cash. Recognized revenue is what the P&L is allowed to count this period. See SaaS metrics for ARR math.
Walking through a year
Year start ARR $4.0M. Year end ARR $6.0M. Average ARR ≈ $5.0M. If everything were monthly, recognized revenue ≈ $5.0M.
Instead, 65% of the book prepays annually. Suppose collections = $5.9M and revenue recognized = $5.0M:
Deferred revenue increase ≈ 5.9M − 5.0M = $0.9MThat $0.9M is cash retained against future service. If opex plus COGS cash was $7.5M:
Net operating cash drain ≈ 7.5 − 5.9 = $1.6MA naive "revenue − expense" using $5.0M revenue would look $2.5M underwater on an accrual sense before adjustments. Knowing which gap you are in changes whether you hire.
Payment terms amplify this. Net-60 enterprise paper can put two months of billings into AR. Growing on those terms consumes cash even with great win rates.
When the gaps flip
If you shift the book from annual to monthly, or if growth stalls, deferred revenue stops rising and then falls. Recognized revenue can still look fine — you are unwinding last year's prepays — while collections drop. Teams that hired against the old cash gap walk into a surprise drain.
Unlimited usage on prepaid plans is the other flip: deferred revenue is booked, inference COGS burns cash every day, and margin dies while the balance sheet still looks "funded" by the liability.
Common mistakes
- Hiring off ARR while collections lag. ARR is a run-rate. Payroll is cash.
- Treating billings as revenue. An invoice is not earned yet, and it may not have been collected.
- Ignoring a monthly-shift. Cash gets harder while the P&L still looks familiar.
Check yourself
Start ARR $4M, end ARR $6M, all monthly. About how much revenue did you recognize?
About $5M — the average ARR over the year.
Collections $5.9M, recognized revenue $5.0M. What happened to deferred revenue?
It rose about $0.9M. Cash came in ahead of revenue.
Key takeaways
- ARR, billings, collections and recognized revenue are four different numbers.
- Growth plus annual prepay: cash looks better than the P&L.
- Shrinkage or a monthly shift: cash looks worse than the P&L.
- Hire against collections and runway, not against ARR alone.
Further learning
Next, do not confuse a raise with a healthy business: operating vs financing cash.
Related
Cash flow and the three statements
Why profit ≠ cash, how the balance sheet and cash flow statement work, deferred revenue from annual prepay, and how the three statements link.
SaaS metrics: ARR, churn and net retention
ARR and the bridge, bookings vs revenue, logo vs revenue churn, GRR, NRR, and the quick ratio.