When commercial lenders evaluate a business loan application, Dun & Bradstreet is the first bureau they pull. Not Experian. Not Equifax. D&B. It is the oldest and most widely used business credit reporting agency in the world, with over 500 million business records. The Paydex score it generates is the single number that more lenders use than any other business credit metric.
Most business owners have never heard of it. That is the problem.
What Dun & Bradstreet Actually Is
Dun & Bradstreet (D&B) is a business data and analytics company founded in 1841. It collects payment data from vendors, suppliers, and financial institutions and uses that data to score businesses on their creditworthiness. Lenders, suppliers, and potential business partners all use D&B data to evaluate risk before extending credit or entering into contracts.
Unlike personal credit bureaus — which collect data on every adult automatically — D&B only creates a business file when:
- You register your business directly with D&B and request a D-U-N-S number, or
- A vendor that reports to D&B submits a trade line for your business
This is the most important operational fact about D&B: your file does not exist until you create it or a vendor creates it for you. Many businesses have been operating for years with no D&B file at all — and therefore no Paydex score — because no one ever initiated the registration.
Lenders use D&B data for three main purposes:
- Payment behavior — does this business pay on time, and how consistently?
- Business verification — does this entity actually exist, and is its information consistent across official records?
- Risk scoring — what is the probability this business will default on obligations in the next 12 months?
The D-U-N-S Number: What It Is and How to Get It Free
The D-U-N-S (Data Universal Numbering System) number is the unique nine-digit identifier D&B assigns to every registered business entity. It is the foundation of your D&B file — think of it as the EIN equivalent for the D&B system.
Getting a D-U-N-S number is free. Go to dnb.com, navigate to the "Get a D-U-N-S Number" section, and complete the registration. You will need your:
- Legal business name (must match your secretary of state filing exactly)
- Business address (must match your other official filings)
- EIN
- Business phone number
- Year the business was established
- Number of employees
- NAICS code (your industry classification)
Free D-U-N-S registration typically takes 30–45 business days. If you need the number faster — for a government contract bid, SBA loan application, or vendor account — D&B offers an expedited process for a fee. For most business credit building purposes, the free option is fine. See our dedicated guide on how to get a DUNS number for the step-by-step process.
The Paydex Score in Plain English
The Paydex score is D&B's dollar-weighted measure of how promptly your business pays its obligations. It runs from 0 to 100, and the interpretation is simple:
| Paydex Score | Payment Behavior | Lender Interpretation |
|---|---|---|
| 100 | 30+ days early | Best possible — premium no-PG products available |
| 90 | 20 days early | Excellent — most no-PG credit lines approve |
| 80 | Prompt (on the due date) | Good — no-PG equipment and credit lines available |
| 70 | 15 days late on average | Fair — limited no-PG options; most products require PG |
| 50 | 30 days late on average | High risk — vendor accounts and basic credit only |
| Below 50 | 60+ days late | Very high risk — minimal credit available |
The critical insight: an 80 Paydex does not mean "pays on time." It means pays exactly on the due date. To reach 80+, you need to pay your vendor invoices before they are due — ideally 5–10 days early. Businesses that pay on the due date hover around 75–79. Businesses that consistently pay 10–30 days early reach 80–90+.
For a complete breakdown of how to improve your Paydex score, see our Paydex score guide.
Net-30 Vendors That Report Specifically to D&B
Not all vendors report to D&B. Some report only to Experian Business. Some report to both. Knowing which vendors definitely report to D&B is critical for building your Paydex score efficiently.
Quill. Quill is a Staples subsidiary selling office supplies, toner, and business essentials. It is one of the most reliable starter net-30 accounts that reports consistently to D&B. Approves new businesses with minimal history. Apply in the business entity name with EIN.
Grainger. Industrial supplies, maintenance equipment, safety products, and tools. Grainger is a high-credibility vendor account because lenders recognize it as a legitimate industrial supplier. Grainger reports to D&B and is particularly valuable for businesses in trades, manufacturing, construction, or facilities management.
Uline. Shipping supplies, packaging materials, facility and safety supplies. Uline is the most commonly recommended starter net-30 account because it approves almost every legitimate business entity, ships quickly (so you have a reason to order regularly), and reports reliably to D&B and Experian Business.
Office Depot Business Solutions. The commercial division of Office Depot/OfficeMax offers net-30 accounts for business entities and reports to D&B. Approved businesses can manage a running monthly spend on office supplies, technology, and business services — creating consistent monthly trade line activity.
Staples Business Advantage. Staples' commercial account program offers net-30 terms and reports to the major business credit bureaus. Combined with Quill (also Staples), having both accounts gives you two D&B-reporting trade lines from related entities with different SKU coverage.
The strategy: open at least 3–5 of these accounts, make regular purchases (not artificially inflated — buy what the business actually needs), and pay every invoice 5–10 days early. Within 3–4 months, your Paydex score will appear and begin building.
Common D&B File Mistakes That Slow Your Build
D&B uses data-matching algorithms to verify and consolidate business information. Inconsistencies trigger flags that slow score development or prevent trade lines from attaching to your file correctly.
- Wrong business address. If your D&B registration uses a different address than your secretary of state filing, vendor accounts, or bank account, D&B may not connect the trade line reports to your file. Use one consistent address across every source.
- Business name mismatch. "ABC Services LLC" and "ABC Services" are different entries to D&B. Use your exact legal business name — including the LLC or Corp designation — every time.
- Missing or wrong NAICS code. D&B uses the NAICS code to compare your business to industry peers. A missing NAICS code or a code that does not match your actual business category produces an incomplete file that lenders view with skepticism.
- Inconsistency with secretary of state records. D&B cross-references public records. If your D&B registration conflicts with your official state filing — different formation date, different address, different officer names — the file is flagged as potentially inaccurate.
- Not ordering from vendors regularly enough. Trade lines only report activity if there is activity. A vendor account you open and never use does not build credit. You need consistent monthly purchases — even small ones — to keep trade lines active and reporting.
How to Dispute Errors on Your D&B File
If you find errors on your D&B file — incorrect payment status, wrong business information, trade lines that belong to a different business — you can dispute them directly through D&B.
- Access your file. Log into D&B at dnb.com or through their CreditSignal free monitoring product. Review your business information, trade line history, and public records sections.
- Identify the specific error. Note the trade line, date, amount, and what the reported data says versus what the correct data should be.
- Gather documentation. Collect invoices, payment receipts, bank statements, or any records that prove the correct information.
- File the dispute. Submit your dispute through D&B's online portal or by calling their customer service line directly. Include your documentation. D&B has 30 days to investigate and respond.
- Follow up. If the error is not corrected within 30 days, escalate by contacting the vendor that reported the incorrect data and asking them to submit a correction directly to D&B.
File errors are more common than most business owners realize — particularly for businesses that have been operating for more than two years and may have accumulated multiple vendor relationships. Running a full file review every six months is good credit hygiene.
Ready to Build Business Credit the Right Way?
Building a D&B file that lenders trust requires consistent vendor activity, accurate registrations, and regular monitoring. The DIY Accelerator at $97/mo gives you the exact vendor list, registration checklist, and monthly monitoring process to build a fundable Paydex score in 6–10 months.
Published by Famp Business Concierges | Business Credit & Funding Specialists