How to Get a DUNS Number & Build Your Paydex Score to 80+

If you're building business credit, two numbers matter more than anything else at Dun & Bradstreet: your DUNS number (your business identity) and your Paydex score (your business credit score). Neither is hard to get — but most business owners do it in the wrong order and waste months.

This guide walks you through exactly how to get both, what vendors to use, and how to hit a Paydex score of 80 in 90 days or less.

What Is a DUNS Number?

A D-U-N-S Number (Data Universal Numbering System) is a unique 9-digit identifier that Dun & Bradstreet assigns to every business. Think of it as your business's Social Security Number — except it's public, free, and required before you can have any business credit score at D&B.

Without a DUNS number, you have no D&B file. Without a D&B file, you have no Paydex score. Vendors that report to D&B can't credit you. Lenders that pull D&B can't find you. It's the foundational step.

How to Get Your DUNS Number (Step by Step)

1. 1
   Set up your business entity first

   You need an LLC or corporation, a registered address, and an EIN (Employer Identification Number) from the IRS. Get the EIN free at irs.gov. Your DUNS should match your official entity name exactly.

2. 2
   Go to dnb.com and search for your business

   Before registering, search to see if D&B already has a file on your business. Vendors sometimes create D&B entries automatically. If a file exists, claim it instead of creating a duplicate.

3. 3
   Register for a free DUNS number

   Click "Get a D-U-N-S Number" and complete the business profile: legal name, address, phone, SIC code, annual revenue estimate, and year founded. Use your real information — D&B verifies it.

4. 4
   Wait 5–30 business days

   Standard registration takes up to 30 days. If you need it faster for a federal contract, D&B has an expedited option. For business credit building, the standard timeline is fine — you'll need time to open vendor accounts anyway.

5. 5
   Confirm your file is live

   Once you receive your DUNS number by email, search dnb.com again to confirm your business profile is visible. This is when your D&B "file" officially exists and can start receiving payment history.

What Is a Paydex Score?

Paydex is D&B's primary business credit score, ranging from 1 to 100. It measures how promptly your business pays its vendors — specifically, whether you pay on time, early, or late relative to agreed terms.

How Is Paydex Calculated?

Unlike personal credit scores, Paydex only measures one thing: payment timing. It doesn't care about utilization, inquiries, or length of history the same way FICO does.

The scoring logic:

• Paid 30+ days early: 100 Paydex
• Paid on time (net terms): 80 Paydex
• Paid 30 days late: ~50 Paydex
• Paid 60 days late: ~40 Paydex
• Paid 120+ days late: Under 20

D&B weights recent payments more heavily than older ones. A single late payment can tank your score, but it also recovers quickly once you resume on-time payments. You need at least 3 trade references (vendors reporting to D&B) to generate a Paydex score.

Vendors That Report to D&B (Start Here)

The fastest way to build Paydex is to open accounts with vendors that report to Dun & Bradstreet, buy something small, and pay on or before the due date. These are called trade lines.

Can I Get My Paydex Score for Free?

Yes — partially. D&B offers a free account at dnb.com that shows you a summary of your business profile and whether a Paydex score exists. However, your actual numeric Paydex score requires a paid plan (CreditBuilder Plus or higher, starting around $149/month).

The workaround most business owners use:

• Ask vendors directly — when you apply for net-30 terms, many vendors will tell you what D&B shows them
• Nav.com — shows a partial D&B business credit summary for free with account creation
• CreditSafe — another monitoring platform with free trial access

The honest reality: if you're following the tier-by-tier vendor strategy, you don't need to check your Paydex obsessively. Open accounts → buy → pay on time → wait 60 days → check once. That's the cadence.

How to Get a Paydex Score of 80 in 90 Days

1. 1
   Month 1: Foundation setup

   Get your DUNS number, open your Tier 1 vendor accounts (Crown, CEO Creative, Uline), and make your first small purchases. Pay the full balance immediately — don't wait for the due date. Early payment = higher Paydex.

2. 2
   Month 2: Add Tier 2 vendors

   Once Tier 1 vendors report (usually 30–60 days after purchase), you'll have a starter Paydex. Now add Quill, Amazon Business, and Grainger. Make purchases and pay early again.

3. 3
   Month 3: Check and expand

   By month 3, with 5–6 trade lines paying on time, your Paydex should be 80 or above. This is when you can start applying for fleet cards (WEX, Fuelman), store cards (Staples Business, Office Depot), and eventually revolving credit lines.

Common Mistakes That Kill Your Paydex

• Paying late even once — Paydex is pure payment timing. One 30-day late payment can drop you from 80 to 50.
• Opening vendor accounts before getting your DUNS — some vendors create a D&B file for you, but it may not match your official entity. Always get your DUNS first.
• Using your personal SSN instead of EIN — you're building business credit. Always use your EIN on vendor applications.
• Applying with vendors that don't report to D&B — not every vendor reports to credit bureaus. Confirm before opening an account or the purchases don't help your score.
• Not having a business phone listed in 411 — many vendors and lenders verify your business via 411/directory listings. Use a business VOIP number listed under your business name.

Frequently Asked Questions