If a baker sells you a sourdough loaf for nine dollars, the receipt does not list the cost of the flour. Or the natural-gas bill that ran the oven. Or the parchment paper, the proof basket lining, the wrist that mixed it, or the half-dough that collapsed in the morning bake and got fed to the chickens.
Those costs are still there. They are just hiding inside that nine-dollar number, and the baker either knows what they add up to — or quietly hopes that nine dollars is enough. The first version of that baker has a profitable business. The second version has a hobby with a credit-card processor.
The number standing between those two versions has a name. Welcome to Cost of Goods Sold — COGS, to its friends — the most useful financial concept most makers have never been formally introduced to. This post is the introduction.
The short version: COGS is the total cost of making the products you actually sold during a period. It has four buckets — direct materials, consumables and packaging, yield loss and waste, and the allocated share of labor and production overhead — and a single formula: beginning inventory + purchases − ending inventory. Knowing it tells you what your products really cost, what to charge, what to deduct on your taxes, and which products are quietly bleeding you. Not knowing it is how a busy shop and a broke shop end up looking identical from the outside.
What COGS actually means (without the textbook)
Imagine your maker business as two stacked accounts:
- An account for the products themselves — every dollar that touched a product before it left your shop. The flour, the wax, the yarn, the box, the label, the propane, the hour you spent at the bench.
- An account for everything else — Etsy fees, the laptop, the booth fee at the spring market, your accountant, the website hosting, the gas to drive to the post office.
COGS is the first account. Operating expenses are the second account. Both are real costs, and both are deductible if you run a business. But they answer different questions:
- COGS answers: do my products themselves make money?
- Operating expenses answer: does my whole business make money?
A shop can have a healthy COGS picture (every candle covers its true cost with a 60% gross margin) and still lose money for the year because the operating expenses are too high. A shop can also have a punishing COGS picture (every candle costs more than it sells for) and look fine on the surface because the cash from a busy market day disguises the bleed. You will never sort those two cases apart without a COGS number.
That is what makes COGS the single most useful number in a maker's books. It is the dividing line between the product is broken and the business model around the product is broken — and the fix for each is completely different.
The four buckets — what goes IN to COGS
A maker's COGS has four buckets. The first one is obvious. The other three are where most makers leak money.
Bucket 1: Direct materials
The stuff that physically becomes the product. Flour, butter, eggs. Wax, fragrance oil, wicks. Silver wire, gemstones, findings. Yarn. Clay. Lumber. Coffee beans.
This is the bucket every maker tracks because it is the only one with a clear receipt attached to it. If you stopped here, you would have what most makers casually call their "cost." It is also typically a fraction — often less than half — of a finished product's true cost. The rest is hiding in the other three buckets, and if you stop at this one, you are looking at a piece of the picture and calling it the whole thing.
Bucket 2: Consumables and packaging
The supporting cast. Things that are consumed in the act of making or selling but are not the headline ingredient.
- Jars, bottles, tins, boxes
- Labels, hang tags, ribbons, tissue paper
- Parchment paper, cupcake liners, wax paper
- Pipettes, gloves, mixing cups
- Care cards, thank-you notes, sample sachets
These add up. A four-ounce candle's vessel and label often cost more than the wax inside. A jar of jam's label, lid, and shrink band can rival the fruit. A printed thank-you card slipped into every order is a real per-unit cost the day you start putting one in.
Bucket 3: Yield loss and waste
The part of every batch that does not become sellable product. This is the bucket that catches makers off-guard, because it is invisible — there is no receipt for the dough that did not rise, the soap that seized in the mold, or the half-bag of yarn that became a swatch.
Concrete examples by craft:
- Coffee roasters: a meaningful share of green-bean weight evaporates during roasting as moisture, chaff, and volatile compounds — the coffee roasting post walks through how to measure your own loss rate by origin and roast level instead of relying on a generic figure.
- Sewists: the gap between yards purchased and yards used in finished pieces — the scrap between pattern pieces, the directional-print waste, the cut errors. This number varies widely by layout and pattern, and the only honest way to know yours is to track it for a few projects (see the sewing post).
- Bakers: an allowance for dough that overproofs, cookies that spread too far, the corners of a cake that get trimmed, and the test bake nobody bought.
- Soap makers: the bottom of the pot that scrapes out unevenly, the shavings from beveling, the test bars that never get sold.
- Woodworkers: offcuts and shavings can swallow a substantial share of a board on a single project (see the woodshop post, which walks through measured yield on real builds).
If you are pricing as if your input weight equals your output weight, your prices are too low. By how much depends on your craft and your process — and the only way to know your own number is to track it.
Bucket 4: Direct labor and production overhead
The hands and the lights. The hour you spent at the wheel, the kiln firing, the electricity for the dehydrator, the share of your studio's rent and insurance that covers production hours.
A quick honesty check on each:
- Direct labor: the time spent making product. Not posting on Instagram, not packing online orders, not answering customer DMs — those go in operating expenses. The hour at the bench, sewing machine, mixer, or kiln.
- Production overhead: utilities, equipment depreciation, kiln firing cost, propane, the part of rent that covers your studio. (Equipment depreciation gets its own post — short version: your kiln, oven, mixer, or 3D printer is silently losing value, and that loss is part of COGS.)
A note on labor and taxes: if you are a sole proprietor, you do not pay yourself a W-2, so your own labor is not a deductible COGS line on Schedule C. But for pricing, your labor absolutely belongs inside the cost of every product. Track it both ways: the tax-COGS number for your return, and a fuller management-COGS number that includes your hours for setting prices.
What stays OUT of COGS
A surprising number of expenses feel like they should be in COGS and are not. Things that look maker-related but live in operating expenses:
- Marketing and advertising — Etsy ads, Instagram boosts, the photographer you hired for a brand shoot
- Selling costs — booth fees, market parking, the new tablecloth you bought for the spring show
- Outbound shipping to the customer (technically a selling expense, though many makers fold it into COGS for simplicity — pick one and stay consistent)
- Software and subscriptions — Etsy listing fees, your inventory app, accounting software, design tools
- Office supplies, business meals, professional fees
- The home-office portion of your rent or utilities
- Mileage to the post office, supplier, or market
These are all deductible if you run a real business — they just live in the operating-expense section of your books, not COGS. The split matters because it is the only way to see whether your products are profitable, separately from whether your business is. A shop that mistakes a $3,000 ad campaign for a COGS line ends up looking like its candles cost more than they sell for, when actually the candles are fine and the ad budget is the problem.
The formula — walked through, no algebra
Here it is in one line:
Beginning inventory + Purchases during the period − Ending inventory = COGS
In English: what you started with, plus what you bought, minus what is still on the shelf, equals what walked out the door.
The formula sounds abstract until you run it once. So let's run it.
A worked example: Maya the candle maker
Maya runs a candle business out of a converted garage. She wants to know her COGS for the first quarter of the year (January through March). Her records show:
Beginning inventory (January 1):
- 18 lbs of soy wax: $54
- 12 oz of fragrance oil (across four scents): $96
- 40 vessels (8oz amber jars): $80
- 60 wicks: $18
- 50 labels: $25
- Total: $273
Purchases during the quarter:
- 50 lbs of soy wax: $150
- 24 oz of fragrance oil: $192
- 120 vessels: $240
- 200 wicks: $60
- 200 labels: $100
- 100 dust covers and care cards: $35
- Inbound shipping on those orders: $42
- Total: $819
Ending inventory (March 31):
- 22 lbs of soy wax: $66
- 9 oz of fragrance oil: $72
- 35 vessels: $70
- 80 wicks: $24
- 60 labels: $30
- 38 dust covers/care cards: $13
- Total: $275
Plugging in: $273 + $819 − $275 = $817 of COGS for Q1.
Maya sold 142 candles in Q1 at an average price of $18, so her gross revenue was $2,556. Her gross profit (revenue minus COGS) was $2,556 − $817 = $1,739. Her gross margin was $1,739 ÷ $2,556 = 68%.
Sixty-eight percent on materials alone sounds great. But notice what is not yet in that number: Maya's labor (she spent roughly 28 hours pouring, labeling, and packing this quarter), her electricity, her share of garage rent, the depreciation on her pour pot and presto pot, the candles that frosted unevenly and got donated as samples. Once she layers those in for her management view, her real gross margin lands closer to 45–50%. Still healthy — but a different number than 68%, and the difference is exactly the amount of money she would have left on the table by stopping at the materials view.
That is the move. Run the formula on the materials side first, because it is mechanical and the receipts are clear. Then layer in the management-view extras for pricing decisions.
Why this number unlocks two superpowers
Here is where it gets genuinely fun. (Yes, COGS is fun. We are doing this together.)
Superpower 1: confident pricing.
You cannot price something whose cost you do not know. You can guess, you can copy the booth across the aisle, you can triple your "cost" and hope. None of those are pricing — they are flinching. A real COGS number per product, plus a margin target, gives you a price you can defend to a wholesale buyer, a craft show jury, or your own brain at 11 p.m. when you are second-guessing the line sheet you sent on Tuesday. The margin vs markup post walks through what to do with the COGS number once you have it.
Superpower 2: clean taxes, fewer dollars to the IRS.
On Schedule C — the form sole proprietors file with their personal return (IRS Schedule C) — COGS lives on Line 4. It gets subtracted from your gross receipts to give you gross profit before any other deduction. A maker who tracks COGS carefully ends up with a smaller taxable number than a maker who does not, for the same business activity. The deductions are the same dollars; tracking them just makes them visible. If you are still working out whether your selling activity even counts as a business yet, the hobby vs. business post is the right starting point.
How to start tracking COGS this week
You do not need accounting software. You need three habits.
- Save every supply receipt. Paper, email, screenshots — anywhere they are findable later. Tag them by month. This alone gets you 80% of the way.
- Count what you have on the last day of each quarter. Raw materials, packaging, finished products. A list with quantities and unit costs. This is the "ending inventory" number — and it is the same number that becomes next quarter's "beginning inventory."
- Run the formula once a quarter. Beginning + purchases − ending = COGS. It takes fifteen minutes when your records are organized.
That is it. That is the whole onboarding. Once the rhythm is in place, you can layer in cost-per-unit refinements, batch-level tracking, and yield-loss percentages — but only after the basic flow is running. The first goal is just to have the number, not to perfect it.
Ardent Seller automates the parts that get tedious — every purchase you log adjusts inventory, every production run pulls materials at their current cost, and every sale records the COGS for that specific product at that specific moment. The four buckets stay in their lanes without you re-doing the math each quarter. If that sounds useful, the inventory and production tools are built around exactly this workflow, and the pricing page has a free tier you can start with.
But the tool is downstream of the concept. Get the concept first. The four buckets, the formula, the quarterly habit. Run that for a quarter and you will know more about whether your products make money than the version of you reading this paragraph could have answered last week.
That is a real superpower. Welcome to the COGS club.
Related reading
- Recipe Costing 101 — The natural next step. COGS is the total; recipe costing is how you split it across each individual product so you can price them.
- Margin vs Markup — Once you have a COGS number, the next mistake is confusing margin with markup. This post walks through the pricing math so the gap between the two stops costing you money.
- Equipment Depreciation for Small Makers — The most-skipped piece of the production-overhead bucket. Your kiln, oven, mixer, or printer is part of COGS, and this post covers how to track its share.
Free resources
A few free downloads from the Ardent Workshop library that pair well with this post:
- Product Pricing Calculator — Plug a product's COGS into a working spreadsheet that walks you from cost to a defensible retail and wholesale price.
- Schedule C Tax Expense Tracker — A line-by-line tracker that mirrors Schedule C's structure, so the COGS bucket stays cleanly separated from your operating expenses all year.
- Inventory Tracker Starter Kit — A starter spreadsheet for logging purchases, tracking quantities on hand, and producing the ending-inventory number the COGS formula needs.
This article is provided for educational purposes only and does not constitute financial, tax, or accounting advice. COGS rules, allowable deductions, and the line between materials and operating expenses depend on your specific business structure and jurisdiction. Schedule C treatment is described in general terms and is not a substitute for guidance on your individual return. Consult a qualified accountant or small-business advisor before making financial or tax decisions based on this content.