# Vendor Kickbacks: Signs in Purchasing and Payments

- Author: PreciseBankFlow (https://www.precisebankflow.com)
- Published: 2025-03-25
- Updated: 2025-03-25
- Category: Embezzlement and fraud schemes
- Canonical: https://www.precisebankflow.com/blog/vendor-kickbacks

> Vendor kickbacks signs: rising prices from one supplier, steered contracts and lifestyle changes, and what payment data can and can't show.
Vendor kickbacks are secret payments a supplier makes to an employee who steers business its way, usually funded by inflated prices or quantities on the company's invoices. The kickback rarely touches the company's bank. What you can see is the effect: one supplier's prices rising faster than others, contracts that skip competition, and a buyer whose lifestyle has changed.

## How do vendor kickbacks work between a buyer and a supplier?

Vendor kickbacks work by splitting an overcharge. A supplier bills the company more than it should, the employee who approves purchases lets it through, and the supplier passes part of the extra to that employee in cash, gifts or a job for a relative. The company pays a real supplier for real goods, so its books look normal.

That makes kickbacks different from a fictitious vendor scheme. Nothing is invented. The supplier exists, the goods usually arrive, and the invoice matches a purchase order. What is false is the price, the quantity or the reason that supplier won the work.

Typical forms:

- **Price inflation.** Unit prices a few percent above market, on every order.
- **Quantity inflation.** Billing for more than was delivered, with the buyer signing the receiving report.
- **Lower quality at full price.** Cheaper goods substituted, and the buyer accepts them.
- **Unneeded purchases.** Orders the company did not need, placed to give the supplier volume.
- **Bid rigging.** The buyer leaks competing bids or writes specifications only one supplier can meet.

The kickback is paid outside the company's systems, often to a personal account or in cash. That is why the investigation starts with purchasing data, not with a search for the payment.

## Price creep from one supplier as a vendor kickback sign

Price creep is the most measurable vendor kickback sign. If one supplier's unit prices rise steadily while other suppliers of the same goods hold steady, someone is accepting the increase. Kickbacks are usually funded by small, repeated overcharges rather than one large one, so the trend over a year or more matters more than any single invoice.

What to compare:

- **Unit price over time.** The same item, from the same supplier, quarter by quarter.
- **Unit price across suppliers.** The same item from two suppliers in the same period.
- **Invoice price against contract or quote.** Billed prices that drift above the agreed rate without a change order.
- **Freight, fuel and handling charges.** Add-ons that grow faster than the base price.
- **Quantities against usage.** Purchases that exceed what operations consume, building stock that later gets written off.

A price comparison needs clean data. If the ledger records only invoice totals, ask the supplier for line-level invoices or pull them from the purchasing system. Totals alone hide unit price changes behind changes in volume.

## Steered contracts and bid patterns behind vendor kickbacks

Steered contracts are purchases where an employee makes sure one supplier wins regardless of price or quality. The pattern shows in purchasing records: competitive bids skipped, the same supplier winning by a narrow margin, orders split to stay under the bid threshold, or specifications written around one product. Each habit has an innocent version, so look for several together.

Bid and contract signs:

- **Sole source without a reason.** Contracts awarded to one supplier with no written justification.
- **The same narrow winning margin.** The favored supplier wins by a few hundred dollars each time, as if it knew the other bids.
- **Late changes after award.** Change orders that raise the price soon after a low bid wins.
- **Losing bidders who never win.** Competitors that bid but never get work, which can mean cover bids.
- **Orders split below thresholds.** Several orders to the same supplier on the same day, each just below the amount that would require bids.
- **One buyer, one supplier.** A single employee handles every order with that supplier, and resists rotation.

Purchasing rules exist to prevent exactly this. Where the rules are weak, or one person can request, approve and receive, steering is easy and hard to see.

## What can payment data show about vendor kickbacks?

Payment data can show where the company's money went, how much it paid each supplier and when spend shifted. It cannot show the kickback itself, which moves from the supplier to the employee outside the company's accounts. Bank and ledger data find the overpayment. Interviews, supplier records and, sometimes, the employee's own bank records find the bribe.

What bank and ledger tests can reveal:

- **Spend concentration.** One supplier's share of a category growing quickly.
- **Payment timing.** A supplier paid faster than terms while others wait, which a buyer can arrange.
- **Duplicate or split payments.** The same invoice paid twice, or one purchase paid in pieces.
- **Payee bank changes.** A supplier's remittance account switched to a different bank or a personal name.
- **Payments with no purchase order.** Direct invoices approved by the same buyer.

What payment data will not show:

- **The kickback payment** from supplier to employee.
- **Whether the price was fair**, without outside quotes or market data.
- **What was actually delivered**, without receiving records or a physical count.

Before you rely on the ledger for any of this, make sure the accounts are reconciled to the bank, so the payments you analyze are the ones that cleared. The walkthrough on [reconciling an account in QuickBooks Online](/blog/how-to-reconcile-in-quickbooks-online) covers that step for the most common small-business ledger. PreciseBankFlow can then match the statement lines to the ledger and flag possible duplicate payments, which removes one innocent explanation for high supplier spend.

## Lifestyle and relationship signs around a buyer taking kickbacks

Lifestyle and relationship signs support a pricing exception; they do not prove a kickback on their own. A buyer who drives a supplier's demo car, takes trips paid by a vendor, or has a relative on the supplier's payroll has a conflict of interest. When that buyer also approves the supplier's rising prices, the pricing pattern deserves a closer look.

Signs worth recording:

- **Gifts and hospitality** beyond what company policy allows, especially travel and event tickets.
- **Personal relationships** with the supplier's owner or sales staff that were not disclosed.
- **Relatives employed by the supplier**, or a side business that sells to it.
- **Spending above salary**, which has many explanations and is the weakest sign alone.
- **Refusal to let others deal with the supplier**, or to take leave.

A conflict of interest form, signed each year by buyers and approvers, makes many of these easier to see. Undisclosed ties that come to light later are a strong sign in themselves.

## Kickbacks on the sales side through refunds, credits and write-offs

Kickbacks can also run the other way, from the company's own sales staff to a customer's buyer. A salesperson who wants volume, or a commission, can pay the customer's buyer back out of the company's revenue by granting unearned discounts, issuing refunds for goods never returned, or writing off part of the customer's balance.

How this shows in the books:

- **Credits concentrated on one customer** and one salesperson.
- **Refunds paid to an address or account that is not the customer's.** The post on [how fraudulent refunds are issued and traced](/blog/fraudulent-refunds) covers the tests.
- **Write-offs approved without collection effort.** Receivable balances cleared as bad debt soon after sale. See [accounts receivable write-off fraud](/blog/accounts-receivable-write-off-fraud) for the patterns.
- **Discounts above the price list** that only one salesperson grants.

These sales-side schemes are easier to see in the company's own data than purchasing kickbacks, because the credit, refund or write-off is recorded and approved by someone inside the business.

## When a rising supplier price is not a vendor kickback

Most supplier price increases are not kickbacks. Raw material costs, fuel, wages, tariffs and exchange rates move prices for every buyer. A supplier may also charge more because it delivers faster, offers better terms or provides a product others do not. The question is whether the increase is explained and whether other buyers pay the same.

Innocent explanations to rule out:

- **Market-wide increases.** All suppliers of the item raised prices at about the same time.
- **Contract escalation clauses.** The contract allows yearly increases tied to an index.
- **Changed specification.** The company asked for a better or different product.
- **Smaller orders.** Unit prices rise when order sizes fall.
- **Rush delivery.** Higher prices for urgent orders the business asked for.

If the increase is explained in a document the supplier and the company both signed, and the same price applies to other customers, a kickback is unlikely. If the only explanation comes from the buyer, ask someone else to get a competing quote.

## A vendor spend test for kickback risk

A vendor spend test compares suppliers in one category over several years, looking at total spend, share of category and unit price. It points to suppliers whose growth or pricing stands out, so you know where to pull invoices and contracts. The example below uses invented figures for one category, packaging materials, at a mid-sized manufacturer.

| Supplier (example) | Spend year 1 | Spend year 3 | Share year 1 | Share year 3 | Unit price change |
| --- | --- | --- | --- | --- | --- |
| Supplier A | $210,000 | $395,000 | 42% | 68% | +19% |
| Supplier B | $180,000 | $120,000 | 36% | 21% | +4% |
| Supplier C | $110,000 | $65,000 | 22% | 11% | +3% |

Supplier A gained share while raising unit prices far faster than the others. That is the reverse of what open competition produces, and it is the supplier to review first.

### Steps for the test

1. **Reconcile the bank and ledger** for the period, so supplier totals reflect real payments.
2. **Export payments by supplier** for three years and group suppliers by category.
3. **Calculate share of category** for each supplier each year.
4. **Pull line-level invoices** for the top suppliers and compute unit prices for common items.
5. **Flag suppliers** whose share and unit price both rose faster than the category.
6. **Check approvals** on the flagged supplier's invoices. Note whether one person approved most of them.
7. **Get an outside quote** for the same items and compare.

A flag from this test is a reason to look at contracts and talk to purchasing, not a finding of fraud. Firms that want the statement matching done before the analysis can [ask to join PreciseBankFlow's early access](/get-started).