A marketplace seller can be profitable on every unit and run out of cash in October. The supplier wants a deposit at order and the balance at shipment; the goods spend four to eight weeks on the water and in receiving; the marketplace's warehouse holds them until they sell; the marketplace pays out two weeks after the sale, less a reserve it holds against returns; and the largest order of the year is placed in August for a season that does not pay until December. The business's constraint is not margin; it is the cash that funds the gap, and the growth rate is set by how much of that gap the balance sheet can carry.
What is the cash conversion cycle for a marketplace seller?
From cash out to cash in, by stage. Supplier deposit at purchase order — typically 30 percent; balance at shipment — 60 to 90 days later for overseas manufacturing; inbound transit and customs — 30 to 60 days; receiving and prep; days in marketplace inventory until sale — the SKU's turn; settlement timing — the marketplace's payout cycle, commonly every 14 days, with a delay from the sale date; and the reserve — a portion of the payout held against returns and chargebacks, released on a lag. Summed, the cycle in most import-based sellers runs 120 to 180 days from the deposit to the cash, and longer for slow SKUs.
The cycle is measured by SKU, not by business. A fast-turning SKU with domestic supply may have a 45-day cycle; a slow oversize SKU from overseas may have 240; the blended cycle is the inventory-weighted average, and the slow SKUs are where the working capital hides.
How are inventory turns and the reorder model built by SKU?
Turns are cost of goods sold over average inventory, by SKU. A SKU turning eight times a year holds about 45 days of supply; one turning twice holds 180; the marketplace's storage fees, aged-inventory surcharges, and the seller's cost of capital all rise with days in inventory, so turns are a margin number as much as a cash number.
The reorder model. Sell-through by SKU and season; supplier lead time including production and transit; safety stock sized to lead-time variability and the stockout cost (lost rank, lost sales, low-inventory fees); the reorder point and quantity; and the cash commitment the order creates on its deposit and balance dates — so that every purchase order appears in the cash forecast on the days the cash leaves, not the day the goods arrive.
Dead and slow inventory is cash that stopped moving. Inventory by SKU by age, with the aged-inventory thresholds and the liquidation value; a SKU with 300 days of supply is a decision — liquidate, remove, or hold — and the decision has a cash and a fee consequence either way.
Why does the fourth-quarter buy decide the year?
The seasonal peak is bought in August and September. For a seller with 40 percent of annual sales in the fourth quarter, the inventory for that quarter is ordered in late summer, deposits paid then, balances paid at shipment in September and October, and the marketplace's payouts arrive in November through January; the cash trough lands in October, when the seller has paid for the season and sold none of it.
The buy is modeled against cash by week. Expected fourth-quarter demand by SKU with the forecast's error range; the purchase orders and their payment dates; inbound costs and tariffs at current rates; the marketplace's fourth-quarter storage surcharges; advertising spend ramping into the season; the cash on hand, the settlement receipts expected, and the financing available — by week from August through January, with the trough identified and the funding for it secured before the deposits are paid.
Under-buying and over-buying both cost. Under-buying loses the season's sales and the listing's rank; over-buying leaves inventory in January carrying storage fees into a slow quarter and tying up cash until spring; the model runs the buy at the demand forecast's low, expected, and high cases and sizes it where the downside is survivable.
What do payout holds and reserves do to cash?
The marketplace holds part of the money. Rolling reserves against returns and claims; account-level holds for policy reviews, verification requests, or performance issues; delayed disbursement for new or flagged accounts; and the settlement lag itself; a reserve of 10 to 20 percent of recent sales held for a month is working capital the seller funds; an account hold can stop all cash for weeks.
The forecast carries the actual payout behavior. Settlement amounts and dates from the account's history, the reserve pattern, and a contingency for a hold — because a seller with one marketplace account and no cash cushion has a single point of failure on its entire cash flow.
What financing fits the cycle?
Match the instrument to the asset. Inventory financing and purchase-order financing fund the buy against the goods; supplier terms — negotiated from deposit-and-balance toward net-30 or net-60 after shipment as volume and history build — are the cheapest working capital available; marketplace lending programs advance against expected settlements at a cost that is often high but fast; a revolving line from a bank sized to the cycle, with inventory in the borrowing base, is the structure most established sellers end up needing; and merchant cash advances priced on a factor rate are the expensive last resort that many sellers reach for first.
The cost of capital goes into the margin. A seller funding a 150-day cycle at an effective 24 percent annual rate is paying about 10 percent of the inventory's cost in financing; that cost belongs on the SKU's contribution line, and it changes which SKUs are worth carrying.
What growth rate can the balance sheet fund?
Growth consumes working capital before it returns it. A seller growing 50 percent a year must buy 50 percent more inventory before it collects 50 percent more settlements; the working capital required rises with sales times the cycle; the self-funding growth rate is roughly the contribution margin divided by the working capital intensity, and a seller growing faster than that needs outside capital or a shorter cycle.
The levers that shorten the cycle fund growth. Supplier terms, faster inbound, SKU rationalization toward faster turns, pricing and advertising that move inventory, and reserve management; each day cut from the cycle releases working capital the seller can grow on.
Why is this CFO work?
The cycle by SKU requires purchasing, logistics, inventory, and settlement data joined by date; the reorder model is a demand and lead-time model with cash dates; the fourth-quarter buy is a weekly cash forecast with the trough and its funding; the financing structure is a capital decision matched to the asset; and the fundable growth rate is the number the owners need before they set a target. The operator owns the sourcing, the listings, and the demand; the CFO owns the cash that funds them.
Worked example
A marketplace seller, US$6.8 million gross sales, 42 percent in the fourth quarter, overseas suppliers at 30 percent deposit and 70 percent at shipment, 14-day settlements with a 12 percent rolling reserve.
| Stage | Days | Cash effect |
|---|---|---|
| Deposit at purchase order | Day 0 | 30% of order out |
| Balance at shipment | Day 75 | 70% out |
| Transit, customs, receiving | Days 75–125 | Freight and duties out |
| Days in marketplace inventory (blended) | 68 | Storage fees accrue |
| Sale to settlement | 14–21 | — |
| Reserve release | +30 | 12% held |
| Blended cycle | ≈ 165 days | — |
| Fourth-quarter buy (modeled by week) | Figure |
|---|---|
| Inventory ordered for Q4 | US$1.72 million |
| Deposits paid (August) | US$516,000 |
| Balances paid (September–October) | US$1.2 million |
| Cash on hand at August 1 | US$640,000 |
| Trough (week of October 20) | −US$410,000 without financing |
| Settlement receipts resume at scale | mid-November |
| Line of credit secured in July, sized to the cycle | US$750,000 at a borrowing base on inventory |
| Peak draw | US$480,000; repaid by January 15 |
Illustrative figures for a hypothetical organization; not a client's data.
The seller had earned US$520,000 the prior year and had been within two weeks of missing a supplier balance payment in October, which it covered with a merchant cash advance at an effective rate above 40 percent. The cycle model showed the trough nine months in advance; the line was secured in July on the inventory borrowing base; supplier terms were renegotiated on the three largest SKUs to 20 percent deposit and net-30 after shipment, which cut the cycle by 45 days on 38 percent of the buy; and the long tail was liquidated in the spring to free US$140,000 of dead inventory. The self-funding growth rate was computed at 34 percent; the owner had been targeting 60 and now knows what the extra 26 points cost.