By Heidi Macomber · September 30, 2026
How to Audit Supplier Charges: Catch the Hidden Fees Eating Your Food Margin
You negotiated a price. You got a handshake and a price sheet. Six months later, your ingredient costs are up 8% and you cannot explain why. The invoice price on chicken looks right. The case count matches. So where did the money go? It went into the charges layer. The freight minimums, the fuel adjustments, the restocking fees, the missed rebates, the promotional allowances you earned and never claimed. This is a guide to auditing the charges that live below the line item, where most operators never look.
The Difference Between Price and Cost
Your unit price is what you pay for the product. Your total cost is what you actually spend to get that product onto your shelf. Those are two different numbers, and the gap between them is where suppliers quietly grow their margin.
Most food business owners audit the first number. They check the price per pound of brisket against the quote. That is the easy part. Almost nobody audits the second number, because it requires reading the bottom third of every invoice and understanding what each charge means.
If your food cost percentage keeps climbing and your recipe costs have not changed, the problem is almost certainly in the charges layer, not the ingredient pricing.
The Six Charge Categories to Audit
Pull your last three invoices from each supplier. Go to the section below the line items. Here is what you are looking for.
1. Delivery and freight charges
Every distributor has a freight policy. The most common structure: free delivery above a minimum order size, and a fee below it. The fees range from $15 to $75 per delivery depending on your region and distributor.
What goes wrong: The minimum creeps up without notice. You signed up when the minimum was $250. Six months later it is $400, and you are still placing $300 orders and paying a $35 delivery fee every time. That is $140 a month on four weekly drops, or $1,680 a year, for nothing.
What to check: Find the current minimum order for free delivery in writing from your rep. Compare it to your average order size over the last 90 days. If you are paying freight on more than 20% of your orders, either consolidate orders or renegotiate the minimum.
2. Fuel surcharges
Fuel surcharges were designed to be temporary. They are tied to a diesel price benchmark, and they are supposed to scale up and down with that benchmark. In practice, they scale up quickly and down slowly, or not at all.
The U.S. Energy Information Administration publishes weekly national diesel prices, and most fuel surcharge policies reference a specific diesel price threshold. If your invoice still shows a fuel surcharge, look up the current EIA benchmark, compare it to the threshold in your supplier's policy, and see whether the surcharge should still be active. Often it should not.
What to check: Ask your rep for the fuel surcharge policy in writing. It should specify the diesel price threshold at which the surcharge activates and the per-case or percentage formula. If they cannot produce a policy document, the surcharge is discretionary. Discretionary charges are negotiable.
3. Restocking and returns
This is money flowing the wrong direction. You ordered something. You need to send it back. The supplier charges you a restocking fee, typically 15 to 25% of the product value.
What goes wrong: Two things. First, you are paying restocking on items that were the supplier's error, not yours. Short-dated product, wrong pack size, damaged goods. Those should be credited in full with no restocking fee. Second, you are not capturing credits for product you returned at all. The driver picks up the case, you assume the credit will show up on the next invoice, and it does not.
What to check: Pull your last 12 months of invoices. Search for any line that says "credit" or begins with a negative sign. Now compare that to your own log of returns and rejections. If you returned six cases of bad produce over the quarter and only see two credits on the invoices, you are missing four.
4. Volume rebates and promotional allowances
This is the charge category that works in your favor, if you claim it. Many distributors and manufacturers offer rebates based on annual purchase volume, or promotional allowances tied to featuring a product on your menu. These are real money. They are also the easiest money to lose, because they require you to ask for them.
The National Restaurant Association's annual State of the Industry reporting has noted that food and beverage costs remain a top-three operating expense for operators, which makes capturing every available rebate and allowance directly material to margin. A 1% annual rebate on $150,000 in purchases is $1,500. That is a month of liability insurance, or a new prep table.
What to check: Ask your rep directly: "What volume rebates and promotional allowances am I eligible for, and what do I need to do to claim them?" Get the answer in writing. Then track your eligibility monthly. Do not assume the supplier will apply the credit automatically. They will not.
5. Contract versus billed discrepancies
If you have a written pricing agreement with a supplier, that document is your audit baseline. The agreement specifies unit prices, contract term, and any conditions that allow price changes. Your job is to compare billed prices to contracted prices on every invoice, not just when something feels off.
What goes wrong: Suppliers introduce a "market adjustment" or "commodity surcharge" line item that effectively overrides the contracted price without renegotiating the contract. This is common with proteins, dairy, and cooking oil. The contract says you pay $2.85 a pound for chicken. The invoice shows $2.85. But there is a separate $0.12 per pound "market adjustment" line buried lower on the invoice. Your real cost is $2.97.
What to check: Read every invoice line, not just the unit price column. If you see a surcharge or adjustment line that is not in your contract, challenge it. A signed pricing agreement is enforceable. If the supplier wants to change the price, they need to renegotiate the contract, not add a line item.
6. Tax and fee errors
Sales tax rules on food purchases vary by state and by product category. In many states, food purchased for resale is exempt from sales tax. But invoices sometimes carry tax on items that should be exempt, either because the supplier's system misclassified the item or because your tax exemption certificate is not on file.
What to check: Verify your resale exemption certificate is on file with every supplier. Then scan the tax line on each invoice. If you are being charged tax on bulk ingredients intended for resale, you are owed a credit.
The Quarterly Charge Audit
This takes about 90 minutes per supplier. Do it once a quarter. The amount you recover will pay for the time many times over.
- Pull the last 13 weeks of invoices for each supplier.
- Build a spreadsheet with one row per invoice and columns for: invoice date, product subtotal, delivery fee, fuel surcharge, restocking fees, rebates applied, tax, and total billed.
- Calculate your effective markup. Take total billed minus product subtotal, divide by product subtotal. This is the percentage you are paying above the line-item prices. For most operators, this should be under 3%. If it is over 5%, you have a problem.
- Identify the largest charge lines and trace each one back to a policy or contract. If you cannot find the policy, the charge is negotiable or removable.
- Document every discrepancy and send a single consolidated email to your rep requesting credits and policy clarification.
One consolidated request gets taken more seriously than six scattered complaints. Suppliers respond to organized customers differently than they respond to ones who seem like they will forget about it.
Download the free Percy Plate quarterly charge audit spreadsheet here - one tab for the audit log, one that rolls totals up by supplier, and the effective markup and flag columns calculate themselves.
What to Do When You Find Overcharges
Do not be angry. Be specific.
Email your sales rep with the invoice number, the line item, the contracted or policy rate, the billed rate, and the dollar amount of the discrepancy. Ask for a credit on the next invoice. Most reps will issue it without argument because they know the charges are indefensible.
If the rep pushes back, escalate to the branch manager or credit department. The further up the chain you go, the more likely the company is to have documented policies that favor you.
Keep a running log of every discrepancy found, every credit requested, and every credit received. After two or three quarters, you will have a pattern. If one supplier consistently overcharges and another does not, that is useful information at renewal time.
How Percy Plate Helps
Percy Plate tracks your ingredient costs and purchase history so you can see the real landed cost of every item you buy, not just the invoice unit price. When a charge layer inflates your effective cost, it shows up in your actual food cost percentage. That is usually the first signal that something is wrong below the line item.
Related Guides
- Vendor Negotiation and Invoice Auditing - How to audit invoice line items and negotiate better unit prices
- Supplier Price Tracking - How to track ingredient price changes over time and catch price creep
- Restaurant Inventory Management and Par Levels - The receiving and counting system that catches shortages before they cost you
- Why Your Food Costs Keep Creeping Up - Other reasons your food cost percentage rises when you are not looking
Stop guessing what your dishes cost.
Percy Plate calculates recipe costs, menu prices, and FDA-compliant labels for food businesses. Free to start.
Create your free accountView this article in the app: https://percyplate.com/blog/audit-supplier-charges-guide