Annual lawn contracts are often billed in equal monthly payments, even though work is seasonal. A client starting mid-season pays a prorated share of the remaining months.
The example
$2,400/yr, joins with 8 months left.
| A | B | |
|---|---|---|
| 1 | Item | Value |
| 2 | 2400/12 × 8 | — |
| 3 | Prorated | → $1,600 |
The formula
The formula:
How it works
How it works:
- Monthly rate = annual contract ÷ total months (often 12 for level billing).
- Multiply by months remaining for a mid-season start.
- For per-service contracts, prorate by services remaining instead.
- Level monthly billing smooths cash flow across a seasonal workload.
Level billing decouples payment from the seasonal workload. You mow heavily in summer and little in winter, but billing the annual contract in 12 equal payments gives the client a steady bill and you steady cash flow. Proration just applies the monthly rate to the months a mid-season client will actually be on the plan — clean and defensible. Decide upfront whether the off-season months are billed too.
Try it: interactive demo
Annual total, total months, months remaining.
Variations
Monthly payment
Level billing:
By services remaining
Per-visit basis:
Off-season excluded
Active months only:
Pitfalls & errors
Total months basis. Use 12 for level billing, or active months if seasonal-only.
Per-service option. Prorate by visits if that’s how you sell.
Zero months. No months gives #DIV/0!.
Practice workbook
Frequently asked questions
How do I prorate a seasonal lawn contract in Excel?
What's the monthly payment for level billing?
How do I prorate by services instead?
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