Business credit is not a score you apply for. It is a file — held by Dun & Bradstreet, Experian Business and Equifax Business — that fills up as creditors report how your business pays. Building it is therefore a plumbing job: register the business properly, get the identifiers the bureaus key on, open a few accounts that actually report, pay them early, and repeat until the file is thick enough that a lender can underwrite the business instead of only you.
This page is the cluster’s exit ramp. If your personal score is the problem today, borrowing options live on the bad credit hub and the by-credit-score map. Building the business file is how you stop needing them.
General information, not financial advice.
Form your entity (LLC or corporation) and get an EIN from the IRS — it is free, and any service charging you for one is charging for a form the IRS gives away. Then make the business’s identity boringly consistent: the same legal name, address and phone number on the entity filing, the EIN letter, your bank account, your invoices and any directory listings. Credit bureaus match records by these details; a business that appears under three name variants and two addresses looks like three thin files instead of one real one. Open a business bank account in the entity’s name and run all revenue and expenses through it — the account is also the raw material every revenue-based lender will later read.
Dun & Bradstreet will not generate a PAYDEX score for your business until it has a D-U-N-S number, and the number itself is free from D&B (expedited paid offers exist; the standard route costs nothing). This is the one registration step that is genuinely required. The other two bureaus work differently: Experian Business and Equifax Business open a file for your business automatically when a creditor reports activity against your EIN — there is no registration form, a point many guides blur. You do not sign up for business credit. You transact, and the files appear.
The classic starter tradelines are net-30 vendor accounts — you buy supplies, the vendor gives you 30 days to pay, and the payment gets reported to a business bureau. Uline, Quill and Grainger are the examples most often cited in vendor and bureau guidance. The operative word is reported: plenty of vendors extend net-30 terms and report nothing, which builds you no credit at all. Verify that a vendor reports, and to which bureau, before you buy anything — a tradeline nobody sees is just a purchase.
Per Dun & Bradstreet practice as reported by Nav and vendor guides, a PAYDEX score typically generates once at least three tradelines are reporting. Treat that as a milestone to plan around: three reporting vendor accounts, paid on time, is the moment your business starts having a score at all.
PAYDEX is a dollar-weighted score of payment behaviour, and unlike consumer scores it rewards paying before the due date, not merely on time. Paying a net-30 invoice at day 20 scores better than day 30; day 30 is the neutral baseline, not the goal. This is the cheapest credit improvement available to any business: the same purchases, settled a week or two early, build a stronger file than any product you could buy.
A business credit card adds a revolving tradeline and is usually the second layer after vendor accounts. The nuance most guides skip: many issuers report business-card activity only to the owner’s personal credit file, not to the commercial bureaus. Before applying, check whether the issuer reports to Dun & Bradstreet, Experian Business or Equifax Business. A card that never reports commercially still works as a spending tool, but it does nothing for the file you are building — and its balance may still be sitting on your personal report.
Once tradelines are reporting, pull your business reports from all three bureaus periodically and dispute errors — misposted late payments, tradelines belonging to a similarly named business, stale balances. Files are matched by name and address fragments, so errors are common at exactly the stage when your file is young. Monitoring is also how you confirm the plumbing is working: if a vendor swore it reports and nothing has appeared in two cycles, find out why or replace the tradeline.
A strong business file does not erase your personal score from the room. Most small-business lenders pull the owner’s personal credit and require a personal guarantee for years — often for the life of the business’s borrowing — because the business file is thin compared with the person behind it. What building business credit actually does is widen your options over time: trade credit on better terms, card and line approvals that lean on the business file, and eventually underwriters who weigh the business’s own record alongside yours. It is a ladder, not a switch.
Two related situations have their own pages. If your problem is not a damaged file but no file at all — new EIN, recent arrival, nothing to score — the borrowing routes are different, and they are laid out in business loan with no credit history. And one stale piece of advice to ignore: older guides still describe the FICO SBSS score as the screen SBA lenders use on small applications. SBA retired SBSS effective March 2026; lenders now underwrite small SBA loans with their own commercial analysis. Your business bureau files still matter — just not through that score.
How do you build business credit step by step? Form the entity and get a free EIN; make your legal name, address and phone consistent everywhere; open a business bank account; get a free D-U-N-S number from Dun & Bradstreet; open net-30 vendor accounts you have verified actually report; pay every invoice early; add a business credit card whose issuer reports to the commercial bureaus; then monitor all three bureau files and dispute errors.
How long does it take to build business credit? A PAYDEX score can generate within a few months once at least three tradelines are reporting and being paid. A file thick enough to influence real lending decisions — several tradelines, a card, a year or more of clean early payments — is realistically a 6-to-18-month project. It starts the day the first reporting account opens, which is why starting before you need to borrow matters.
Do I need a DUNS number to build business credit? For Dun & Bradstreet, yes — D&B will not generate a PAYDEX score without one, and it is free to obtain. Experian Business and Equifax Business do not use it; their files open automatically when a creditor reports against your EIN. Since lenders check different bureaus, the practical answer is to get the number and let all three files build.
How many tradelines do you need to build business credit? Per D&B practice as reported by Nav and vendor guides, around three reporting tradelines is the threshold at which a PAYDEX score typically generates. More, paid early over a longer period, makes the file more persuasive — but three verified reporting accounts is the working minimum, and unverified “tradeline” services selling you accounts that do not report are worth nothing.
Sources: Dun & Bradstreet (D-U-N-S registration and PAYDEX generation practice, as reported by Nav and vendor guides); IRS EIN application (free); Experian Business and Equifax Business file-creation practice; SBA Procedural Notices 5000-875701 / 5000-876777 (SBSS retirement, March 2026). Currency verified 2026-10-23.