How to keep a product's cost current as material prices move, read the margin hit before your P&L ever shows it, and catch any product that input inflation has quietly pushed below its cost floor.
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After this you can take a product you costed last quarter, re-cost it at today's material prices, and see in one move what the change did to your margin — before a single number changes on your P&L. That is the difference between finding out you slipped below cost now, when you can still act, and finding out at year-end, when the money is already gone.
The cost you rolled up in the last lesson — $2.37 for a good jar of barbecue sauce — is exact for one set of prices: the ones behind it the day you built it. Nothing about that number is permanent. Tomato paste tracks a commodity that swings with the harvest. Glass and freight ride fuel prices. A supplier sends a new price list. The moment any input moves, the $2.37 is telling you an old story while you sell at today's prices.
A cost sheet you build once and file away is a . Standard costs are useful — they let you plan and compare — but only if you refresh them. A standard cost that never gets updated stops being a plan and becomes a guess that drifts further from reality with every price change. The whole job of this lesson is keeping it from drifting.
You do not rebuild the whole recipe from scratch when a price changes. You change the lines that moved and roll the total forward. Take the barbecue-sauce batch of 200 jars from the last lesson — the figures are made up for illustration; the shape is the point. Two inputs move this quarter:
Everything else holds. So the material bucket rises by exactly those two changes:
Labor is still $150 and overhead is still $60, so the batch rolls forward to $270 + $150 + $60 = $480. Spread across the same 190 good jars the batch yields, that is $480 ÷ 190 = $2.53 a jar, up from $2.37.
Sixteen cents a jar. On the cost, that is about a 7 percent rise — and it came from two line items on two invoices, not a crisis. This is the quiet way input inflation works: no single change looks alarming, but they stack, and the finished cost moves more than any one invoice hinted.
The cost moving is only half the story. What you actually care about is what it did to your . Say this sauce sells wholesale at a fixed $4.00 a jar. Hold that price and lay the two costs side by side:
Read what a 7 percent bump in cost did to the money you keep. Gross profit per jar fell from $1.63 to $1.47 — sixteen cents, about a tenth of the profit you were making on each jar gone, while nothing on your price tag changed. Cost moves margin harder than it moves itself: a small rise on the way in takes a bigger bite out of what you keep. Re-costing without looking at margin misses the whole point. The question a maker keeps asking — am I still charging enough? — is answered here, by watching the margin move as the cost moves, not by staring at the cost alone.
Here is the trap that makes re-costing worth the trouble: your profit-and-loss statement will show you this margin squeeze, but months late.
You already rotate stock oldest-first on the floor — FIFO. Your books flow cost the same way. Under the assumption, the jars you ship and book as cost of goods sold this month carry the cost of the cheaper paste you bought weeks ago. The new, dearer paste is still sitting in raw stock, or in jars not yet sold, valued in your ending inventory. So the gross margin on your P&L keeps reading like last quarter's until you sell all the way through the old-cost stock. The IRS describes FIFO exactly this way: the items in ending inventory are matched with the costs of the items most recently purchased or produced (Publication 538).
Whichever way your books flow cost — FIFO or a weighted average — the P&L is a rear-view mirror. It reports the margin you earned on what already sold, at the cost that was recorded when those units were made. A re-cost at today's input prices is the opposite: a forward look at the margin on the next batch. That forward number is the one a pricing decision needs. Wait for the P&L and you learn about the squeeze after a full inventory cycle of selling into it.
The number to fear is the one that crosses a line. A product's is exactly the per-unit cost you just rolled up. Above it you make something; below it, each sale costs you. Input inflation doesn't just thin a margin — it can push a product's cost clean through a price you've locked.
Say the same sauce also ships to a grocery chain under the chain's own label — same recipe, the chain's label instead of yours at essentially the same cost, so the same $2.53 to build — on a contract that locks the price at $2.50 a jar:
Nothing warned you. The contract price never changed; two ordinary invoices did. A product that was quietly profitable is now quietly bleeding, and on FIFO your P&L won't say so until you've shipped a whole cycle of these jars at a loss. This is why re-costing ends with a floor check: after you update a cost, the very next question is whether that cost has crossed any price you're committed to. Every product now sitting below its floor is one you either re-price, re-negotiate, or stop making — but first you have to see it.
Re-costing one product when one price moves is a two-minute exercise, and you should do it — it is the fastest way to feel how cost drives margin. Doing it for every product, every time any material's landed cost moves, rolling each made-in-house component up at its new cost, and checking each result against the price you sell it for, is a standing chore no cost sheet keeps up with by hand. It is the kind of arithmetic a system built for food carries for you. Bettr Manager, for one, re-costs a product the moment a material's landed cost changes and shows the new margin against your price, so a product slipping below its floor surfaces the day the cost moves rather than the quarter the P&L catches up. However the math gets done, the discipline is the same: the cost you price against is today's cost, and you look at the margin every time it moves.
You can now build a product's true cost and keep it honest as prices swing. The question this lesson keeps raising — is $4.00 still the right wholesale price, and what should that private-label floor have been before you signed — is pricing. Costing tells you what a jar takes to make; pricing decides what to charge for it and how to hold a margin across every channel you sell through. That is the next course.
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