A PAYDEX score is Dun & Bradstreet’s 0-to-100 rating of how reliably a business pays its bills, and it responds to a single behavior, the timing of each vendor payment. Unlike personal credit, it does not fold in debt balances, credit history length, or credit utilization. A $50,000 invoice paid 20 days early carries more influence on the score than a $200 office supply order paid on time.
The mechanic is unusually specific, which is why the build sequence reads like a checklist rather than a multi-factor puzzle. Register the legal entity, claim an EIN, claim a D-U-N-S number, open vendor accounts that do report to D&B, then pay those invoices well before they are due. Skip the tradeline-selection step and the score fails to generate even when every payment goes out on time. Fall below 80 and the favorable terms vendors extend on net-30 and net-60 contracts start to close.
What a PAYDEX Score Measures
A PAYDEX score is a business credit score from Dun & Bradstreet that measures how promptly a company pays its vendors, suppliers, and other accounts D&B tracks. The scale runs from 0 to 100, with 80 generally treated as the threshold for low-risk trade credit. Higher numbers mean the business is paying early; lower numbers mean the business is paying late or not at all.
Personal credit scores weigh debt balances, payment history length, credit mix, and new credit, and they live on a 300-to-850 scale. PAYDEX runs on a 0-to-100 scale and draws only on trade experiences vendors report to D&B. Revenue, time in business, liens, judgments, and personal credit history do not enter the calculation. For startup founders, that means limited operating history does not lower a PAYDEX score on its own; what matters is what gets reported, when, and for how much.
That single-input design is why a finance team can move PAYDEX by changing one habit: how early the AP function pays the largest invoices. The work is making sure the data reaches D&B, which is the part most teams miss.
How Payment Timing Maps to the Number
PAYDEX is calculated from payment data that vendors report to D&B, weighted by the dollar amount of each invoice. D&B assigns each reported payment to a timing bucket based on how early or late it landed, then multiplies the share of dollars in each bucket by the bucket’s weight. The result is a number from 0 to 100 that summarizes the company’s payment history against agreed terms.
The weighting is dollar-driven, with recency layered on top. A $50,000 invoice paid early moves the score more than twenty small invoices paid late, and a payment posted this month counts for more than the same payment posted a year ago. the PAYDEX score range and how the calculation works uses that framework across a 0-to-100 band. The reference points in the table below are anchors, not exact reproductions; the final score depends on the mix and dollar value of a business’s reported tradelines.
The anchors are direct because the inputs are simple. The table below carries the full mapping. The anchor at 80 is the threshold for low-risk trade credit, with 90 and 100 reserved for businesses paying 20 to 30 days early, and the band at 50 separates the moderate-risk business from the high-risk one. Every point of movement up or down the scale maps to a measurable change in days early or late on the underlying invoices.
| Score | Payment timing | Risk band |
|---|---|---|
| 100 | 30 days before terms | Low risk |
| 90 | 20 days before terms | Low risk |
| 80 | 0 days beyond terms (on terms) | Low risk |
| 70 | 15 days beyond terms | Medium risk |
| 60 | 22 days beyond terms | Medium risk |
| 50 | 30 days beyond terms | Medium risk |
| 40 | 60 days beyond terms | High risk |
| 30 | 90 days beyond terms | High risk |
| 20 | 120 days beyond terms | High risk |
| 1-19 | 120+ days beyond terms | High risk |
The climb from 50 back to 80 takes longer than the climb from 80 to 100 ever did, because the dollar weighting rewards sustained early payment on the largest invoices more than it rewards a single on-time settlement on a small one. Most businesses do not need to memorize the table, but they need to know that the difference between a moderate-risk reading and a low-risk one is mostly how many days early the largest invoices get paid.
Who Reads PAYDEX and What It Costs Below 80
Vendors, lenders, insurers, landlords, and partners all read the score. Vendors pull PAYDEX before extending trade credit on net-30 or net-60 terms. Lenders consult it before approving lines of credit, term loans, and SBA-backed financing. Insurance carriers check it when underwriting commercial policies and setting premiums.
A score of 80 or higher is the working definition of a good PAYDEX score, the threshold vendors and lenders treat as the floor for favorable terms. Below 80, suppliers often require prepayment, cash on delivery, or shorter terms that tie up working capital. Below 50, the company reads as high risk on a D&B report, and credit decisions slow down or stop. Each band carries its own commercial cost, from shortened payment windows to outright credit denials. The pain shows up on the financing side, where a moderate-risk reading can push a business from prime rates into higher tiers, and on the supplier side, where credit-based purchasing arrangements may be refused altogether.
The SBA Rule Change Reshaping the Small-Business Picture
The Small Business Administration issued a procedural notice on January 16, 2026 announcing that, as of March 1, 2026, lenders will no longer be required to prescreen 7(a) Small Loan applications using the FICO Small Business Scoring Service, or SBSS, score. The change applies to 7(a) Small Loans, the SBA’s primary program for loans of $350,000 or less, and it leaves lenders free to use the credit policies they already run for similarly sized non-SBA commercial loans. The full document is in the SBA’s procedural notice sunsetting SBSS prescreening.
For context, the SBSS score runs from 0 to 300, blends consumer credit, business credit, financial data, and application data, and the SBA had been using it as the sole scoring model for determining creditworthiness on 7(a) Small Loans. The minimum required SBSS score for that prescreening had been raised to 165 in June 2025, up from 155 in October 2020 and 140 before that. With the March 1, 2026 change, the SBSS prescreen is no longer mandatory, though a lender can still require it.
The shift does not kill SBSS. What it does is open the door for lenders to lean more heavily on the underlying data they already pull, including the D&B file, the PAYDEX score, and the tradeline history behind it. The regulatory drag on switching models means SBSS is likely to stay in the toolkit for the next several years.
The safe thing for a lender to do is to stick with SBSS.
Levi King, Nav’s CEO, co-founder, and executive chairman, said that in comments accompanying the SBA notice. He added that banks are highly regulated and unlikely to take on the additional risk of an abrupt change in underwriting standards. For a finance team, the practical signal is that PAYDEX and the D&B tradeline history behind it are about to get more weight in 7(a) Small Loan decisions, whether through SBSS, through a lender’s own model, or through both. King also pointed out that banks often adopt new scoring models slowly, preferring the models that have been tested over time. The result is a market in which PAYDEX and the underlying D&B tradeline file get read more often and in more places, not fewer.
That makes the tradeline history behind PAYDEX more than a credit-building exercise. It becomes a piece of evidence a small-business lender reads directly, alongside or instead of the SBSS aggregate. A clean PAYDEX with multiple reporting vendors, a D-U-N-S file that matches IRS and state records, and a dispute-free history gives a lender fewer reasons to escalate. A thin PAYDEX, or one held up by a single large vendor, gives a lender more.
Setting Up the Foundation for a PAYDEX Score
The first three steps of the build do not touch a vendor account at all. They set up the legal and tax identity that D&B uses to track a business in the first place. Skip them, and the tradelines that come later either report against the wrong entity or fail to report altogether.
A federal Employer Identification Number, or EIN, is a nine-digit number the IRS issues for free and assigns to employers, partnerships, LLCs, corporations, and most other formal entities. The IRS, in its guidance on how to apply for an EIN from the IRS, notes that an EIN can be obtained in minutes when the principal place of business is in the U.S. and the application is filed online. Mail and fax applications are also accepted, though processing stretches from a few days to about four weeks. The EIN is what links a business’s tax filings to its credit identity.
A D-U-N-S number is Dun & Bradstreet’s nine-digit identifier for a business, separate from the EIN, and it is the key that D&B uses to attach a tradeline to the right company file. NerdWallet’s walkthrough on the steps to claim a free D-U-N-S number notes that the application is free and that standard processing can take up to 30 business days, with a $229 fee available to compress the timeline to about eight business days. Many businesses that have been operating for more than a year already have a D-U-N-S number on file without knowing it, because a supplier or a prior lender may have triggered the assignment. The lookup step takes a few minutes and prevents the kind of duplicate record that delays a score for months.
Choosing Vendors That Do Report to D&B
This is the step most teams skip, and it is the step that decides whether the build works. D&B generally requires at least two tradelines reported by at least two different suppliers, plus at least three trade experiences posted, before it will generate a PAYDEX score. Pay every vendor early for half a year and the score still does not appear if none of those vendors ever sent payment data to D&B. The tradeline supply chain is invisible until you ask which links are reporting and which are not.
The dollar weighting adds a second layer. A $50,000 invoice from a core supplier paid 30 days early will move the score more than a stack of $200 office supply receipts paid on time, even though the office supply purchases happen more often. That makes high-value existing relationships the most efficient tradelines to lean on, as long as those suppliers report to D&B. Opening many accounts is a worse strategy than opening the right few. The goal is to make sure D&B has data, and to make sure at least some of those tradelines carry meaningful invoice size.
Three categories of vendors are worth pursuing for tradeline reports. The list below is a starting point, not a roster, and reporting relationships can change, so confirming with each vendor’s credit department before opening an account is worth the call.
- Office supply companies such as Uline, Grainger, and Quill
- Telecommunications and shipping companies that have historically reported to D&B
- Your own existing core suppliers already extending net-30 or net-60 terms
Many teams do not build a vendor-by-vendor reporting check into their AP setup. The fastest way to confirm is to ask the vendor’s credit or accounts-receivable team directly whether they send payment experiences to D&B, and to keep a dated note of the answer. Once the tradelines are open and reporting, the data starts flowing in the next vendor reporting cycle, which is usually the next monthly or quarterly close.
The Pay-Verify-Dispute Loop Behind PAYDEX
Once reporting tradelines are open, the cadence matters more than the size of the spend. A $10,000 invoice paid 20 days early will move the score. Pay it on terms instead and the result caps at 80. The mechanic is consistent, and the habit of paying early is what carries the score from 80 to 90 to 100 over time, weighted toward the largest invoices.
Confirming that payments reach the D&B file is the second operational habit. Checking the D&B report 60 to 90 days after opening the first reporting accounts shows whether the tradelines are posting and whether the payment dates match what was actually paid. If a tradeline is missing, the vendor is the place to start; if a payment date is wrong, the dispute path is D&B’s customer service portal, with supporting evidence like a bank record or canceled check. Each business credit bureau maintains its own file, so a D&B dispute does not update Experian or Equifax.
- 0 to 100: PAYDEX scale
- 80: threshold for low-risk trade credit
- 90 to 120 days: typical time to first published score
- Up to 30 business days: free D-U-N-S processing
- March 1, 2026: SBA sunset of SBSS prescreening for 7(a) Small Loans
Disputing a single misreported late payment on a large invoice can be the difference between a moderate-risk and a low-risk read, because the calculation is dollar-weighted. The dispute is a separate workflow from the AP cycle, and finance teams that have not built a quarterly D&B file review into the close usually find the errors months after they have already moved the score. Building that review into the quarterly close is the cheapest way to keep a clean file.
Long-Term Habits That Keep PAYDEX High
PAYDEX reflects the most recent 12 to 24 months of trade activity, so a high score today does not lock in a high score for the next two years. The habits that built the score are the ones that hold it. Stop paying early, and the score drops as new late payments replace the older early ones in D&B’s window.
Diversifying across at least three to five reporting vendors protects against a single point of failure. If a vendor stops reporting or closes the account, the rest of the tradeline base keeps enough data in the file for D&B to recalculate. Treating a vendor’s D&B reporting status as a procurement criterion, not a back-office detail, is the simplest way to keep that buffer in place. Non-reporting vendors, no matter how reliable, are invisible to PAYDEX.
Quarterly monitoring of the D&B file is the discipline that catches problems before they compound. A misreported late payment, a duplicate entry, or a business-identity mix-up can each shave points off a strong file, and a vendor that quietly stopped reporting is hard to spot from the AP side alone. The check takes an hour, and it pays back every time it catches a reporting error before it ages into the 12-to-24-month window.
Business credit cards are the part of the build that most articles oversell. Standard credit card transactions generally do not count in PAYDEX, because the score is built from invoices with explicit payment terms like net-30, and a card charge at the point of sale does not carry those terms. The narrow exception is when a corporate card reports its account-level payment history to D&B as a tradeline, in which case paying the full statement balance before the due date functions as a reported payment experience. Some card issuers only report negative activity, and some report nothing at all, so confirming with the issuer what actually flows to D&B is the only way to know whether the card is doing what the marketing said it would. Even then, the card’s tradeline contribution to PAYDEX is separate from the individual transactions made on it, and the card payment behavior is what gets recorded.
A stable PAYDEX at 80 or higher is the cost of entry for the credit terms a growing business needs. Net-30 and net-60 from key suppliers, a faster read on lender decisions, and a smoother path through SBA-backed loan prescreens all depend on a tradeline history that looks like the work has been done. The score responds to behavior, and the behavior sits in the AP function.
Frequently Asked Questions
How long does it take to build a PAYDEX score from zero?
Most businesses see a PAYDEX score appear 90 to 120 days after opening reporting tradelines, according to Nav’s overview of D&B’s scoring framework. The build unfolds in three phases: days 1-9 to claim a D-U-N-S number and open reporting vendor accounts, days 10-90 for vendors to report their first payment experiences, and days 90-120 for D&B to publish the score once three experiences are on file. Reaching 80 specifically depends on how early each invoice is paid and on the dollar size of the largest reported invoices.
What is a good PAYDEX score?
A score of 80 or higher is the working definition of a good PAYDEX score, the threshold both Ramp and Nav cite as the benchmark for low-risk trade credit. Scores of 80 mean the business is paying on terms, 90 means paying about 20 days early, and 100 means paying about 30 days before the due date. Anything below 50 is considered high risk, signaling payments that land 30 or more days late.
Does a business credit card that reports to D&B help your PAYDEX?
Standard credit card transactions usually do not count in PAYDEX, which is built from invoices with explicit payment terms like net-30. The exception is when a corporate card reports its account-level payment history to D&B as a tradeline. In that case, paying the full statement balance before the due date registers as a reported payment experience. Confirm with the card issuer whether it reports positive payment history monthly, since some issuers only report negative activity.
What happens if a vendor reports your payment late by mistake?
A single misreported late payment on a large invoice can pull a PAYDEX score down sharply because the calculation is dollar-weighted. The remedy is to dispute the entry through D&B’s customer service portal with supporting evidence, such as a bank record showing the actual payment date. Each business credit bureau maintains its own file, so a D&B dispute does not update Experian or Equifax. The fix is independent in each file.
Does personal credit history affect PAYDEX?
No, personal credit history, debt balances, credit history length, and credit utilization are not part of the PAYDEX calculation. The score is built from trade experiences reported by vendors, weighted by invoice dollar size, and drawn from the most recent 12 to 24 months of activity. Personal credit may matter for related decisions like SBA loan underwriting, which has historically pulled a FICO SBSS score that combines personal and business data.
Is PAYDEX the only business credit score lenders look at?
No, PAYDEX is one of several. Experian’s Intelliscore Plus runs on a 0 to 100 scale but also factors in credit utilization, business size, and public records. Equifax’s Business Credit Risk Score predicts delinquency using financial data and payment trends. Lenders may pull any combination. PAYDEX is the one most directly tied to the accounts payable function, which is why it responds fastest to a finance team’s deliberate effort.
How is PAYDEX different from a personal FICO score?
Personal FICO scores run on a different model, 300 to 850, and weight debt balances, payment history length, credit mix, and new credit. PAYDEX runs on a 0 to 100 scale, weights the dollar size of each invoice, draws only from trade credit reported by vendors, and does not consider personal credit history. A personal score can be influenced by credit card utilization; a PAYDEX score usually cannot, because most card transactions fall outside the trade-credit model.
Disclaimer: This article is for informational purposes only and does not constitute financial, credit, legal, or tax advice. Building a PAYDEX score depends on third-party vendor reporting and credit-bureau processes that can change. Figures and thresholds referenced are accurate as of publication. Consult a qualified financial professional before making credit or lending decisions.
