In this piece · 7 sections
The number under the number
When people ask what an online store is worth, they usually picture one figure: revenue times some multiple, or profit times some multiple. The multiple gets all the attention because it feels like the lever that decides everything. But the multiple is applied to a profit base, and that base is built out of cost of goods sold, gross margin, and the operating expenses underneath them. Get the base wrong and the multiple is decorating a bad number.
For an ecommerce business, the most common base is seller's discretionary earnings — SDE. It starts from net profit and adds back the owner's salary and one-time or discretionary costs. If you have not seen how that differs from the profit metric larger buyers use, our SDE versus EBITDA explainer walks through both. The reason it matters here is simple: every dollar of COGS you can defensibly lower flows straight into SDE, and every dollar of SDE gets multiplied.
COGS is also not a number you get to define however you like. The IRS lays out exactly which costs belong in cost of goods sold — product cost, inbound freight, direct labor, and the inventory you held at the start and end of the year — in its Tax Guide for Small Business (Pub. 334). When your books follow that same logic, a buyer can reconcile your COGS to your tax filings. When they don't, the gap becomes the first thing diligence picks at.
COGS and gross margin drive the profit base
Cost of goods sold is what you pay to acquire or make the product you sell — the unit cost, inbound freight, and the direct costs tied to fulfilling each order. Revenue minus COGS is gross profit, and gross profit divided by revenue is gross margin. That margin is the ceiling on everything below it: marketing, software, the owner's time, and ultimately SDE all have to fit inside what is left after COGS.
Two stores can post identical top-line revenue and land in very different value ranges purely because of margin. Consider an illustrative example (illustrative, not a broker quote): Store A sells $500,000 a year at a 50% gross margin, leaving $250,000 of gross profit. Store B sells the same $500,000 at a 30% margin, leaving $150,000. Before a single risk factor is weighed, Store A simply has more room to convert into the discretionary earnings a multiple is applied to.
This is why margin trends matter as much as the level. A buyer reads a rising gross margin as either pricing power or improving supplier terms, both of which support a stronger multiple. A falling margin reads as competition, discounting, or rising input costs — and that pulls the multiple down even if revenue is flat. The COGS line is not just an accounting entry; it is a narrative about whether the business is getting stronger or weaker.
Watch the trap of a margin that looks great only because the books are missing costs. If your COGS leaves out inbound freight, payment-processing fees, or returns, the gross margin reads higher than the business actually earns. A buyer who normalizes those costs back in will reset your profit base downward — and now the multiple is applied to a smaller number than you pitched. A defensible 38% margin beats a flattering 50% that falls apart the moment someone checks the supplier invoices.
Why inventory usually transfers separately
Here is the part that surprises most first-time sellers: the inventory sitting in your warehouse is generally not inside the multiple. The standard structure in small-business and ecommerce deals is that the business is valued on its earnings, and then sellable inventory is transferred on top of that price, valued at cost. The headline figure and the inventory figure are two separate line items in the deal.
The logic is that inventory is a current asset the buyer must fund, not recurring profit the buyer is buying. If inventory were baked into the multiple, a seller could inflate the price simply by overstocking before listing. Treating good inventory as a pass-through at cost keeps the earnings multiple honest and lets the buyer pay for stock dollar-for-dollar rather than at a 3x or 4x markup.
The practical takeaway: do not assume a $300,000 valuation includes the $80,000 of stock on your shelves (illustrative, not a broker quote). In a typical structure the buyer pays the business price plus the agreed value of good inventory at cost. Our pillar guide on ecommerce business value covers how brokers package these pieces, and the complete valuation guide puts the asset-type picture in context.
Getting that inventory figure clean takes real counting, not a guess. Knowing what you actually hold, what's moving, and what's stale is the core of inventory management — Shopify's inventory management guide walks through the methods (cycle counts, FIFO, reorder points) that produce a number a buyer will trust.
A store that can hand over an accurate, current stock count signals operational maturity; one that can't invites a discount on the whole deal.
SKU breadth, concentration, and the multiple
Once the profit base is set, the multiple is mostly a story about risk and durability — and SKU structure is a big part of that story. A store with revenue spread across a healthy range of products is more resilient than one where a single hero SKU carries the business. If that one product gets cloned, banned from an ad platform, or knocked off by the supplier, a concentrated store can lose most of its income overnight.
This is the same idea as traffic and channel concentration, just on the product side. We cover the demand-side version in how traffic concentration affects value: when too much of the outcome depends on one source, the buyer prices in fragility. A store where 80% of revenue comes from one SKU has product-side concentration risk; a store where the top SKU is 15% of revenue is structurally safer, and that safety shows up as a firmer multiple.
Revenue share of the top SKU vs. perceived risk
There is a ceiling on the upside, too. A sprawling catalog with thousands of low-velocity SKUs is not automatically safer — it can signal operational drag, complex supplier relationships, and storage cost. The pattern buyers reward is a manageable catalog where no single product is a point of failure and the long tail genuinely contributes. Breadth that reduces dependence helps; breadth that just adds complexity does not.
Run the test on your own store. Pull last year's revenue by SKU and ask one question: if your single best seller vanished tomorrow — banned ad account, supplier walks, a cheaper clone floods the listing — how much of the business survives? If the answer is most of it, your spread is working in your favor. If the answer is a fraction, you have concentration to fix before you list, and that fix lifts the multiple more reliably than chasing another point of revenue growth.
Dead stock, suppliers, and write-down risk
Not all inventory is an asset. Slow-moving and obsolete stock — units that have not sold in months, seasonal leftovers, discontinued lines — is a liability dressed up as an asset on the balance sheet. In diligence, a buyer separates sellable inventory from dead stock and either excludes the dead portion from the transfer or marks it down hard. Carrying a pile of unsellable units does not raise your price; it raises questions.
Supplier and minimum-order-quantity dependence is the next thing under the microscope. A store reliant on a single overseas manufacturer with long lead times and high MOQs is more fragile than one with several qualified suppliers. If the relationship is informal, undocumented, or tied personally to the current owner, the buyer reads transfer risk — will the supplier honor the same terms after the sale? That uncertainty shaves the multiple.
Working capital and buyer financing
Inventory ties up cash, and the more cash a deal requires, the harder it is to finance. A buyer is not just paying the business price plus inventory — they also need working capital to keep reordering once they own it. A store that needs $120,000 of stock on hand at all times (illustrative, not a broker quote) demands a buyer with deeper pockets than an equivalent-earnings store that turns inventory quickly on shorter terms.
This is why inventory turnover quietly shapes the buyer pool. Fast turns mean less cash frozen in stock and a healthier cash-conversion cycle, which widens the set of buyers who can afford the deal and makes lender-backed offers easier to assemble. Slow turns shrink that pool. A smaller pool of able buyers tends to mean softer offers, which can pull the realized price toward the bottom of an estimated range.
Lenders and buyers who run the financials care about the same fundamentals the SBA flags in its guide to managing business finances: a balance sheet that holds up, an accounting method applied consistently, and cash flow you can actually project.
When much of an acquisition is funded by an SBA-backed loan, the lender underwrites those numbers directly. Inventory that ties up cash and turns slowly weakens the cash-flow story the loan depends on — and a deal the lender hesitates on is a deal that comes in lower.
None of these factors lives in isolation. COGS sets the base, inventory transfers beside it, SKU spread and supplier strength shape the multiple, and working-capital tie-up sizes the buyer pool. A credible estimate weighs all of them together and returns a range with a confidence level — never a single guaranteed price. You can see how an asset-type estimate frames these inputs with the asset comps view.
Putting it together
If you are sizing up your own store, work the layers in order. Start with COGS and gross margin to understand the real profit base, because that is what any multiple multiplies. Separate your sellable inventory from your dead stock, and remember the good inventory typically transfers at cost on top of the business price rather than inside the multiple.
Then stress-test the multiple. How concentrated is revenue across SKUs? How dependent are you on one supplier or one product? How much cash does the business freeze in stock, and how fast does that stock turn? Each answer either firms up the range or widens it. Selling soon? Our guide to selling an ecommerce store covers how to present these numbers so a buyer trusts them.
