Death by a Thousand Cuts… to Your Invoice
Big buyers have a whole playbook for paying their suppliers less than they actually owe. The three most common tactics: invoice short pays (paying slightly less than the invoiced amount, usually by amounts too small to dispute), payment delays (slow-walking remittances past agreed terms), and unilateral deductions (chargebacks and fees the supplier never agreed to). None of it is technically illegal. All of it adds up. Here's how the squeeze works, why it keeps working, and what suppliers can actually do about it.
Picture an invoice for $4,800 and the remittance comes back at $4,799.83. Seventeen cents short. You notice it, sort of, but you'd have to pull the original purchase order, match it against the remittance, draft an email, follow up twice, and maybe escalate it before anyone replies. That costs you more in payroll than seventeen cents is worth, so you write it off and move on. The next invoice is twelve cents short, then a clean one, then nineteen cents short, then three clean ones. About 30% of invoices come back light, none of them by enough to fight over, and all of it adds up to real money on the other side of the ledger.
This is not a theory and it is not specific to logistics, even though carriers and brokers see it constantly. Anyone who invoices a large company has been on the receiving end of this at some time or another, whether you're a freight broker, a packaging supplier, a marketing agency, a contract manufacturer, or the small business that makes the cleaning supplies stocked in the janitor’s closet. The dynamic is the same regardless of what you're selling, and the math always favours the company writing the cheques.
When this happened to me, at a former job the client was one of largest grocers in Canada, and I never disputed any of it because the per-invoice amount was too small to justify the resources required to chase it. I did mention the pattern once to someone on their accounting team, the short pays stopped for a while after that, and whether that was cause and effect or pure coincidence I genuinely don't know.
It's never just the short pay
The short pay is the most obvious play, but it almost never travels alone. The same companies that quietly skim invoices also tend to drag their feet on paying, and slip in deductions that nobody knows what they are there. Three different tactics, same underlying math, small enough that you won't fight, frequent enough that it matters.
There is a name for this. When an individual does it to a bank, it's called salami slicing or penny shaving, and it's a recognized form of financial fraud where small amounts are illicitly taken from a large number of transactions, with each deduction designed to go unnoticed. People have gone to prison for it. In 2008, a man in California was jailed for opening 58,000 PayPal accounts to collect a few cents at a time from each one. But when Fortune 500 companies do a structurally identical version of it to its suppliers? That has no name, no prosecutor, and no enforcement. It just keeps happening.
This is a business decision
Tesco, the largest supermarket chain in the UK, got formally busted for this in 2016. The country's grocery regulator investigated and found Tesco had breached the supplier code by delaying payments, making unilateral deductions, and failing to resolve disputed invoices promptly. The regulator said the breaches "were not isolated incidents, each involving a number of suppliers and significant sums of money". The CEO publicly apologized. Twice. The fix only happened because a regulator with teeth got involved.
And UNFI, the $31 billion distributor that supplies Whole Foods, is currently fighting a class action filed in November 2024. Suppliers allege UNFI hits them with "opaque and constant deductions," takes prompt-payment discounts even when paying late, and pushes suppliers into negative balances that freeze all their other invoices until the account is back in the black. The kicker: suppliers who push back on the deductions allegedly get added to a "non-preferred vendor" list. The case is still in progress, but the pattern alleged is the same one.
In every version of this story, the math is the same. The buyer is big, the supplier is smaller, the per-invoice damage is too small to dispute, and the cumulative damage funds a measurable margin lift on the buyer's side. Tesco built it into the culture. UNFI is alleged to have built it into the system. The Canadian grocer I worked with just quietly let it happen and waited to see who would notice.
The only reason any of this works is that the cost of disputing invoices used to be higher than the value of under payment. That equation is finally changing.
What to do about it
If you're a small or mid-sized supplier invoicing into a much larger company, this isn't a fair fight, but it isn't a hopeless one either, and the good news is that the resource gap that made this scam work for decades is finally closing. AI tools and modern accounts receivable software can now do the boring, repetitive matching work that used to take a full-time AP clerk a week to get through, and that changes the math of whether a dispute is worth filing.
Four things actually work, and they work better when you do them together:
Audit every remittance, not just the round numbers. Most modern AP and TMS platforms can automatically flag any variance between what was invoiced and what was paid, and there are now AI-powered AR tools that will reconcile remittances against original invoices, surface short pays, categorize them by reason code, and even draft the dispute email for you.
Track the pattern, not the individual incidents. One short pay is a mistake but thirty percent of invoices coming in light is a policy. Build a running log with the customer, the invoice number, the amount short, the reason given (if any), and the date. Then you bring all this information into the next renegotiation, supplier review meeting, or, if it ever comes to it, a small claims filing.
Bring it up, not as an accusation, but as a question. In my one experience that was enough to make the pattern stop for a while. Something as plain as "we're seeing a consistent variance on remittances, can your team take a look?" puts it on record, signals that you're paying attention, and gives them an opportunity to fix it without anyone losing face.
Write the dispute terms directly into your contracts. If you have the volume to justify it, define a variance threshold above which a short pay automatically triggers a dispute review, define the documentation requirements both ways, and define the timeline for resolution. Most large buyers will push back on this, some will agree to it, and the ones who refuse outright are telling you something useful about how they plan to do business with you.
Short pays are usually not the only thing happening, either, they're just the easiest one to measure. Once you start looking, you'll probably find a few other places where a big customer has been quietly testing how much you'll absorb.
Next post in this series will look at what big carriers do to shippers, including the time the U.S. Department of Justice sued YRC, Roadway, and Yellow for systematically reweighing shipments and conveniently only "fixing" the weight when it favoured them.
