Auditing a material cost line that looks too low or too high

This page teaches a merchandiser, planner or brand buyer how to audit a material cost line that looks suspiciously low or high, by rebuilding it from its own consumption figure and price rather than judging it by feel. It is for anyone who has looked at a quoted fabric cost and felt it was wrong without being able to say exactly why. This mainly teaches the decision flow of an order: deciding whether to accept, question, or reject a quoted cost is only a sound decision once it is checked against the calculation behind it.

Course 2's earlier lessons showed how a fabric consumption figure and its wastage are built, and how trims and secondary materials are costed on separate rows. This lesson turns those same skills into an audit tool: given a finished material cost line, such as a fabric cost per piece, this lesson shows how to reconstruct it from consumption times price and confirm whether the quoted figure is correct, using Order A's own fixed fabric cost of USD 1.15 per piece as the reference calculation and Cedar & Co.'s own domestic order as the audit practice case.

You need: Lessons 1 to 3 of this course, which build fabric consumption, wastage and material costing; this lesson audits figures built the same way.

By the end of this lesson you can:

• Rebuild a fabric cost per piece from its own consumption figure and its own price per kilogram.
• Compare a quoted material cost line against its own rebuilt figure to confirm whether it is correct.
• Identify the two most likely causes when a rebuilt figure disagrees with a quoted one: a wrong consumption figure or a wrong price.
• Explain why a cost line that looks "too low" deserves the same audit as one that looks "too high".
• Apply the same audit method to a material cost line other than fabric, such as a trims figure.

Not covered here: building the consumption, wastage and material cost figures themselves from scratch (Lessons 1 to 3, already covered), building a complete material cost sheet for a whole order (Lesson 5 of this course).

A material cost line is audited by rebuilding it from consumption multiplied by price, then comparing the rebuilt figure against the quoted one, never by judging the quoted figure on its own.

A material cost line such as "fabric: USD 1.15 per piece" is not audited by asking whether USD 1.15 sounds reasonable; it is audited by multiplying the material's own consumption figure by its own price and checking whether the two multiply to the quoted cost. Order A's own fabric cost, USD 1.15 per piece, rebuilds exactly from its own fixed consumption of 0.205 kg per piece multiplied by its own fixed fabric price of USD 5.60 per kilogram, with the small residual explained by rounding.

The same rebuild-and-compare audit applies to any material cost line, but what looks suspicious and what the mismatch usually means commonly differ.

Cedar & Co. audits a fabric cost line from a new supplier that looks lower than Delta Garments' own quote for a similar fabric.

Cedar & Co., the domestic brand, receives a costing sheet from a new potential supplier quoting its own T-shirt's fabric cost at USD 0.92 per piece, noticeably below the figure Delta Garments has quoted for a similar fabric. Cedar & Co.'s own buyer cannot decide whether to accept this lower price, question it, or reject it as unrealistic, without first checking what consumption figure and what fabric price the USD 0.92 was built from.

Cedar & Co.'s buyer asks the new supplier for its own consumption figure and its own fabric price per kilogram separately, rather than accepting the single bundled USD 0.92 figure on trust. The supplier's own numbers turn out to be a consumption of 0.184 kg per piece at a price of USD 5.00 per kilogram, both lower than Delta Garments' own figures of 0.205 kg and USD 5.60. Cedar & Co.'s buyer now has two separate factors to question, not one unexplained final number.

Order A's own USD 1.15 fabric cost rebuilds correctly from its own figures, while the new supplier's USD 0.92 needs its own two factors checked separately.

Order A's own audit, confirming the quoted figure:

The new supplier's own audit, rebuilding its USD 0.92 figure from its own stated consumption and price:

Follow four steps to audit a material cost line that looks too low or too high.

1. Ask for the material's own consumption figure and its own price separately, rather than accepting one bundled cost figure.
2. Multiply the consumption figure by the price to rebuild the cost, exactly as with Order A's own 0.205 kg times USD 5.60.
3. Compare the rebuilt figure against the quoted one; a match, within normal rounding, confirms the quoted figure.
4. Question whichever single factor, consumption or price, differs most from a trusted reference figure, rather than questioning the bundled cost as a whole.

A common mistake is accepting or rejecting a bundled cost figure on gut feeling instead of rebuilding it from its own consumption and price.

A common mistake is deciding that a quoted fabric cost of USD 0.92 "must be" too good to be true, or conversely "must be" a fair market discount, without asking what consumption figure and what price the quote was built from. A bundled final figure alone cannot say whether a lower cost comes from a genuinely lower fabric price, a genuinely lower consumption figure from a tighter marker, or an understated consumption figure that will leave a factory short of fabric mid-run, exactly the kind of understatement Lesson 2 of this course already warned against.

This mistake is easy to make because a single dollar figure is faster to react to than two separate factors, so a buyer under time pressure may accept or reject a cost line without asking the two questions that would actually explain it. The safeguard is to always ask for consumption and price as two separate numbers before judging any material cost line, exactly as Cedar & Co.'s own buyer does with the new supplier's quote.

• Audit a material cost line by rebuilding it: consumption × price, then compare against the quoted figure.
• Order A's own USD 1.15 fabric cost rebuilds from 0.205 kg × USD 5.60 per kg, confirming the quote.
• A cost that looks too low deserves the same audit as one that looks too high; neither should be judged on feel alone.
• A mismatch between the rebuilt and quoted figure points to either the consumption figure or the price, never both blamed at once without checking.
• Always ask for consumption and price as two separate numbers before judging a bundled cost figure.
• The same rebuild-and-compare audit applies to fabric, trims, or any other material cost line.

Cedar & Co.'s buyer has now separated the new supplier's bundled USD 0.92 fabric cost into its own two factors: a consumption of 0.184 kg per piece and a price of USD 5.00 per kilogram, both lower than Delta Garments' own figures for a similar fabric.

• Order A's own reference figures: 0.205 kg consumption at USD 5.60 per kg, rebuilding to USD 1.15.
• The new supplier's own figures: 0.184 kg consumption at USD 5.00 per kg, rebuilding to USD 0.92.
• Both the new supplier's consumption and its price are lower than the reference figures, not just one of the two.

Should Cedar & Co.'s buyer accept the new supplier's USD 0.92 fabric cost as a fair, lower price? Decide before opening the answer.

The Material cost sheet holds a row for rebuilding a quoted material cost from its own consumption and price, exactly as worked through in this lesson.

Download the Material cost sheet from the course page and rebuild your own supplier's quoted cost from its own consumption and price before accepting it.

Download the Material cost sheet (Excel)

Lesson 5: Building a complete material cost sheet for an order

You can now audit a single material cost line against the consumption and price figures behind it. The final lesson of this course puts every skill together, building one complete material cost sheet for a whole order from scratch. Back to the course map