How do I calculate my number?
Add weekly fuel, payroll and taxes, insurance, truck and trailer payments, and overhead. Multiply by the average weeks between delivery and payment. Add a cushion of one to two weeks for breakdowns and slow periods.
Use your own accounts receivable aging to find the real average days to pay. Contract terms and actual payment dates often differ, and the actual number is what drives your need.
What changes the number as I grow?
Each truck adds its own weekly costs. Longer payment terms, slower customers, and seasonal lulls all raise the need. Faster-paying freight and factoring lower it.
Recalculate whenever you add a truck or a major customer. The table below shows the structure; plug in your own figures.
What are signs my working capital is too thin?
Paying bills late to cover payroll, relying on quick pay for every load, a maxed fuel card most weeks and frequent negative balance days are all warning signs.
If you see two or more of these, recalculate your need using the worksheet above. Thin working capital also limits your ability to take good freight with longer terms, so it costs you growth as well as stress.
| Line | Your weekly figure | Notes |
|---|---|---|
| Fuel | — | From fuel card reports |
| Payroll and taxes | — | Include employer share |
| Insurance and truck payments | — | Monthly ÷ 4.33 |
| Overhead | — | Dispatch, ELD, office |
| × weeks to payment | — | From AR aging |
| + cushion | 1–2 weeks | Breakdowns and slow weeks |
Worked example: sizing for a six-truck fleet
A six-truck fleet averaging $112,000 in monthly deposits calculates weekly costs of about $21,000 and five weeks between delivery and payment, then finds its reserve about $36,000 short of that target. Using an illustrative factor rate of 1.24, $36,000 would mean $44,640 repaid over roughly 8 months: 35 weekly payments of about $1,275.
That works out to about $5,580 a month, or 5.0% of the $112,000 this business deposits monthly, and the total cost of the money is $8,640. Once the reserve is built, many fleets keep it in a separate account so it is not spent on everyday expenses.
For comparison, repaying the same $44,640 over 6 months would lift the monthly outlay to about $7,440, or 6.6% of deposits, and because shorter terms often carry a lower factor rate in practice, it is worth asking to see both before choosing.
| Average monthly deposits | $112,000 |
|---|---|
| Amount funded | $36,000 |
| Factor rate (illustrative) | 1.24 |
| Total repaid | $44,640 |
| Cost of the funding | $8,640 |
| Term | about 8 months |
| Weekly payment (35 payments) | $1,275 |
| Payments as a share of deposits | 5.0% |
Who this fits
Usually a fit
- Fleets whose reserves trail their growth
- Carriers adding trucks or customers
- Operators who want a planned cushion
When growth funding can wait
- Fleets already holding enough reserves
- Carriers on quick-pay freight
- Businesses without recent deposits
What you’ll typically need
- Recent business bank statements
- AR aging report
- Monthly expense summary
- Business details
Frequently asked questions
Is there a standard number of weeks?
No. It depends on your customers’ actual payment timing; use your own AR data.
Should the cushion include repairs?
Many fleets include a repair buffer or keep a separate maintenance reserve.
Can working capital build my reserve?
It can bridge it while revenue builds the reserve over time.
Can lower credit still get a fleet reserve shortfall covered?
Often, yes. A fleet owner with a score from 500 can apply for a fleet reserve shortfall, and as credit improves the offers generally get better.
Reserve smaller than your fleet?
Apply and close the gap.
Updated October 6, 2026