First mistake: assuming the D-U-N-S number is interchangeable with a Tax ID. It’s not. The Tax ID is for the IRS; the D-U-N-S is for credit and business intelligence. Don’t mix them up unless you enjoy explaining things to accountants.
Second mistake: ignoring dormant businesses. If you lookup a number and the company shows “Inactive,” run away. That number might be old, but the business might be zombie mode. You don’t want to be the one dealing with a walking corpse of a supplier.
What is a DUNS Number? Understanding the Edge it Gives - DGMG
Last mistake: assuming the free lookups are enough. They’re good for a quick check. But if you’re signing a $50k contract, pay the $40 for the full report. It’s cheaper than a lawyer’s hourly rate. (I’m looking at you, nervous entrepreneur.)
When the Lookup Fails (And It Will)
Sometimes, the D-U-N-S number just… doesn’t work. Maybe it’s a typo, maybe the company never registered properly. In that case, don’t panic—just ask the business for a credit application. A legit company will have no problem giving you bank references and trade references.
If they get defensive? That’s a red flag the size of a billboard. Remember, you’re not being paranoid; you’re being professionally suspicious. It’s a skill, and you’re now a black belt in it.
