Slow Season Reserve Calculator
Summer pays for winter, but almost nobody can say by how much — which is why the shoulder season surprises owners every year. Enter your monthly needs, what a slow month actually generates, and the good months you can save across: this sizes the reserve and turns it into a weekly set-aside.
Method and content reviewed October 1, 2026 · formulas checked against a test suite · runs entirely in your browser
Reserve = Slow months × max(0, Monthly need − Slow-month gross profit)3 × max(0, $14,500.00 − $5,250.00) = $27,750.00This is the discipline the seasonal businesses live or die by: the reserve is built in July, deliberately, into a separate account — not borrowed in February against the line of credit. The Maintenance Agreement Calculator is the other lever: it converts part of the gap into a flat monthly line.
Landscaping: where the number comes from
A two-truck landscaping business needs $14,500/month (overhead $8,500 + owner income $6,000). A slow month generates about $15,000 at a 35% margin, the quiet stretch runs three months, and strong months leave about $4,500 of surplus across six. (Illustrative example — use your own months.)
| Input | Value |
|---|---|
| Monthly cash need | $8,500 + $6,000 = $14,500 |
| Slow-month revenue | $15,000 at 35% margin |
| Slow months | 3 |
| Surplus in a good month | $4,500 across 6 months |
Result: $27,750 of reserve — $1,068.13 a week through the good months
The uncomfortable check: six good months at $4,500 of surplus hold $27,000 — $750 short of the reserve. That's not a reason to skip saving; it's the signal to start one month earlier, shave the gap, or knowingly plan to finance the difference.
Load this example into the calculatorThe calculation
| Slow-month gross profit | $15,000 × 0.35 = $5,250.00 |
| Gap per slow month | $14,500 − $5,250 = $9,250.00 |
| Total reserve | 3 × $9,250 = $27,750.00 |
| Weekly set-aside | $27,750 ÷ (6 × 4.33) = $1,068.13/wk |
| Peak surplus capacity | 6 × $4,500 = $27,000 |
How this calculator works
Every result comes from the formulas below — the math shown is the math used. Change any input and results update instantly in your browser; nothing is sent to a server.
- Monthly cash need:
Monthly Need = Overhead + Owner IncomeThe bills that don't care what the weather is doing. - Gap per slow month:
Gap = max(0, Monthly Need − Slow Revenue × Margin %)What the month costs after the gross profit it does generate. - Total reserve:
Reserve = Gap × Slow Months - Weekly set-aside:
Weekly Save = Reserve ÷ (Good Months × 4.33)Moved to a separate account in the surplus months — deliberately, not residually.
What the result means
The gap is what each slow month costs after the gross profit it does generate — the reserve is that gap summed over the quiet stretch, and the weekly row converts it into a set-aside sized to the good months you have to build it in.
When to use it
Use it before the busy season, while the surplus still exists to save — and re-check after any overhead or income change.
Want the concept behind the math in depth? Read The Slow Season Reserve: What the Quiet Months Actually Cost or How to Price a Maintenance Agreement (So It's Profitable on Its Own).
Common mistakes
- Leaving the owner's income out of the monthly need — the reserve exists to pay you too.
- Saving 'whatever is left over' instead of a fixed weekly amount into a separate account.
- Discovering the gap in February and financing it on the credit line rather than sizing it in July.
Frequently asked questions
How much cash do I need for the slow season?
The sum of each slow month's gap: what the month must pay minus the gross profit it generates. A business needing $14,500/month that generates $5,250 in a slow month has a $9,250 gap — three slow months means a $27,750 reserve. Most owners who compute this honestly find it's larger than what they usually hold, which explains the annual spring line-of-credit ritual.
When should I start saving for the slow season?
In the first strong month, into a separate account — not 'whatever is left over' in the checking account, which is never anything. The weekly set-aside figure converts the reserve into a habit sized to the months you actually have to build it in.
What if my peak surplus can't cover the reserve?
Three honest levers, in order: shrink the gap (cut overhead or grow recurring revenue — the Maintenance Agreement Calculator converts part of the gap into a flat monthly line), start saving earlier in the year, or knowingly plan to finance part of it and price that financing cost into the busy season's rates.
Should the owner's income be in the reserve calculation?
Yes — the reserve exists to pay you through the quiet months, so the income goal belongs in the monthly need. A reserve sized only for overhead protects the business while the owner quietly funds it from savings, which is the most common and least sustainable version of surviving the off-season.
Recurring plan revenue is the lever that shrinks the gap — price one from its real visit costs.
Price a maintenance plan →Related tools and guides
Slow Season Reserve Calculator is part of RateCraft, a set of free pricing and estimating tools for contractors and service businesses. Results are calculated entirely in your browser and are estimates for planning purposes — see our disclaimer and methodology.