Seller accounting goes wrong in one predictable place: the bank feed. Marketplace deposits arrive as tidy lump sums, and books built from them record revenue that is actually revenue minus fees minus refunds minus reserves, all netted invisibly. The business looks smaller than it is, the fees look like zero, and the first honest look often lands at tax time. The fixes are structural and small; this is the short list.
Payouts are not revenue
Each deposit bundles gross sales, the fee stack, refunds, and sometimes rolling reserves for a whole settlement window. Book the components, not the lump:
- Gross sales as revenue, per channel, so channel comparisons mean something.
- Fees as an expense line, visible, trendable, this is where fee creep gets caught, a percentage that drifts up two points eats margin silently in netted books.
- Refunds against revenue, tied to the returns flow.
- Reserves as money owed to you, not missing revenue.
Every marketplace publishes settlement reports that itemize exactly this. The bookkeeping is transcription, not detective work, once the habit exists.
Inventory on the books
The second structural piece: stock you buy is an asset, not an expense. It becomes COGS unit by unit as sales happen, at landed cost, under a valuation method you pick once with an accountant. This is what makes monthly margins real: a big March stock buy is March inventory, not a March loss, and June’s sales carry June’s true costs.
The supporting cast follows from it: counts you trust make the inventory number real, shrinkage books as its own expense when counts and books diverge, and dead-stock writedowns recognize reality before the year-end forces it.
The other two traps
Sales tax is never yours. Collected tax is a liability you hold briefly, not revenue, and most marketplaces remit it for you under facilitator laws, the basics. Books that mix tax into revenue overstate sales and understate nothing good.
Cash versus accrual. Pure cash-basis books and inventory do not mix well, expensing purchases when paid makes profitable months look terrible and stockout months look great. Most sellers land on accrual treatment for inventory (asset, then COGS) even when small; the threshold where full accrual and a professional become mandatory varies by jurisdiction, which is the accountant conversation, had once, early.
The monthly reconciliation habit
One session per month carries most of the weight:
- Pull each channel’s settlement report for the period.
- Match gross sales, fees, refunds, and reserves to the books, differences are either transcription errors or surprises worth knowing about.
- Tie the inventory number to the count discipline, books-to-floor.
- Read the three numbers that run the business: gross margin after true COGS, fee percentage per channel, and cash position against the buying calendar.
Sellers running consolidated multichannel data start this session with the sales and inventory sides already assembled; the books become a check, not an archaeology dig.
Common questions
Do I need accounting software from day one?
You need the structure from day one, gross-not-net revenue, inventory as asset, fees visible. A spreadsheet can hold that structure early; software makes it durable as channels multiply.
How do refunds book when the item comes back sellable?
Reverse the revenue, and return the unit’s cost from COGS back into inventory, the restock path. Refund-without-return skips the second half.
What does an accountant need from me?
Settlement reports per channel, PO records with landed costs, and period-end inventory values from real counts. Arrive with those and you buy advice instead of bookkeeping hours.
When is netted-deposit bookkeeping actually fine?
Arguably never past hobby scale: the fee line it hides is one of your two or three largest expenses, per-channel fees routinely run 10-20% of revenue.
Books that match the shelves
Per-SKU costs, consolidated sales, and inventory truth across every channel, the raw material of clean books, from $49/month with unlimited orders. See pricing.