Build Business Credit for an LLC: DUNS, Net 30, and the Address Rule

Why business credit is separate from personal credit

Personal credit reports run through Experian, Equifax, and TransUnion under the FCRA. Business credit reports run through D&B, Experian Business, and Equifax Business under different reporting rules. The two systems share almost nothing: they pull from different data sources, use different scoring models, and follow different dispute processes.

The biggest practical difference is the scoring scale. Personal FICO scores run 300 to 850. The D&B PAYDEX score runs 0 to 100, with 80+ considered prime. Experian Intelliscore Plus runs 1 to 100. Equifax Business Credit Risk Score runs 101 to 992. A business owner who has perfect personal credit can have no business credit profile at all, since the two systems track entirely separate accounts.

• Personal credit (FICO). Pulls from credit cards, mortgages, auto loans, and student loans reported under the owner's SSN. Affects personal lending and rental applications.
• Business credit (PAYDEX, Intelliscore, Equifax Business). Pulls from vendor accounts, business credit cards, and business loans reported under the LLC's EIN and DUNS number. Affects business lending, vendor terms, and supplier limits.
• The crossover risk. A personal guarantee on a business card makes the business debt show up on the personal credit report too. Avoiding the personal guarantee is the second goal of building business credit, after growing the score itself.

Step 1: Form the LLC and get the EIN

The foundation for business credit is an LLC (or corporation) that the bureaus can identify as a separate entity from the owner. Sole proprietorships and DBAs cannot build business credit because they share the owner's SSN. The legal entity needs to be the borrower of record on every account that reports.

1. 1File the Articles of Organization with a state Secretary of State. The state filing creates the LLC and assigns it a state file number. Total cost ranges from $40 (Kentucky) to $500 (Massachusetts), with most states between $100 and $200.
2. 2Get an EIN from the IRS using Form SS-4. The EIN is the LLC's federal tax ID, and it is also what the credit bureaus use to identify the entity. Foreign founders without an SSN can apply for an EIN by mail or fax through the IRS International Department, with detail in the companion guide on EIN without SSN.
3. 3Open a business bank account in the LLC's name using the EIN and Articles. The bank account creates a financial transaction history that the bureaus eventually use as additional data, and it separates the LLC's finances from the owner's personal accounts. The business bank account address requirements guide covers the address documentation banks ask for during onboarding.
4. 4File a fictitious business name (DBA) if the LLC operates under a name different from its legal name. Some lenders use the DBA as the public-facing name on the credit profile. Most LLCs do not need a DBA at this step, but check the operating state's rules if the LLC plans to do business under multiple brands.

Step 2: Get a DUNS number and pass the D&B address verification

The DUNS number is a nine-digit business identifier issued by Dun & Bradstreet, the oldest and most-cited business credit bureau. A DUNS number is free, takes about 30 days to process for a new entity, and is the prerequisite for the D&B PAYDEX score that most vendors and lenders check before extending credit.

1. 1Apply at the D&B website using the LLC's legal name, EIN, business address, and a phone number where someone can answer during business hours. The application asks for the year the business started (use the LLC formation date), the number of employees, and the SIC industry code.
2. 2Wait 30 days for processing. D&B verifies the LLC against state Secretary of State records, the IRS EIN database, and a phone verification call. Expedited processing for $229 cuts the time to 5 business days, but the free 30-day track works for most founders.
3. 3Confirm the entry in the D&B database. Once approved, the LLC has a DUNS number visible at the D&B Direct lookup tool. The PAYDEX score starts at 0 and grows once vendor accounts begin reporting payment history.

The address rule is where most founders without a commercial location get stuck. The fix is straightforward: secure a real commercial business address with a lease or license agreement before applying for the DUNS number. The agreement does not need to be a full office lease. A virtual office license agreement from a USPS commercial-classified provider satisfies D&B's verification rules in the same way as a coworking license or a small office lease does.

save office operates seven commercial-classified addresses across the US (Los Angeles, New York, San Francisco, Wilmington Delaware, Cheyenne Wyoming, Tampa Florida, and Washington DC) with a license agreement on file from day one. The address activates within 24 hours, which means the DUNS application can be submitted the same week the LLC files its Articles. The address-checker tool flags whether a current or proposed address has the commercial USPS classification that D&B looks for.

Step 3: Open Net 30 vendor accounts that report to the bureaus

The PAYDEX score grows when vendors and creditors report payment history to D&B. Most consumer-facing vendors do not report business credit. The vendors that report are a specific list of suppliers and trade creditors that participate in the D&B Trade Exchange or its Experian and Equifax equivalents.

The strategy is to open three to five reporting Net 30 accounts in the first three months, place small recurring orders to generate payment history, and pay every invoice on or before the due date. PAYDEX scoring rewards early payment: paying 30 days early earns the maximum 100, paying on the due date earns 80, and paying 30 days late drops the score to 50. Most lenders want PAYDEX 80+ for unsecured business credit lines.

save office's license agreement specifically names the LLC as the licensee, which is the document the Net 30 vendor underwriting team asks for when an application gets flagged for additional review. The combination of a USPS commercial classification, a license agreement on file, and an active DUNS number resolves most flagged Net 30 applications without further documentation.

Step 4: Add a business credit card without a personal guarantee

After three to four months of Net 30 vendor reporting and a PAYDEX score in the 70-80 range, the LLC qualifies for a business credit card. Most issuers require a personal guarantee for new businesses, but a few cards are available without one. The trade-off is that no-personal-guarantee cards usually require revenue history, a longer time-in-business, or a higher D&B score.

• Brex. No personal guarantee, requires $1M+ in cash on hand or recent venture funding. Reports to D&B and Experian Business. Available to LLCs with a US business bank account and EIN. Foreign founders without SSN are eligible if the LLC has US revenue.
• Ramp. No personal guarantee, requires $75K+ in monthly bank deposits. Reports to D&B. Card limits adjust based on the LLC's bank account balance. Strong fit for LLCs that have been running 6-12 months with steady revenue.
• Capital One Spark Cash Plus. Requires a personal guarantee but reports business activity, not personal. Useful as a starter card for LLCs that have not yet hit the Brex or Ramp thresholds.
• American Express Business. Requires a personal guarantee for most cards. Reports to D&B Premier and Experian Business. Higher reporting weight than most other issuers, which makes it a strong choice for the second card on the credit profile.

Step 5: Monitor and grow the credit profile

Once the DUNS number is active, the Net 30 accounts are reporting, and the credit card is open, the LLC has a credit profile. Monitoring keeps the profile clean and catches reporting errors early. Growing the profile means adding more reporting accounts, holding lower utilization, and avoiding late payments.

• D&B PAYDEX. 80+ is prime. Monitor at the D&B Credit Insights dashboard ($59/month). Free alternatives include the iUpdate portal for self-corrections and the D&B Direct API tier for high-volume monitoring.
• Experian Business Intelliscore Plus. 76+ is low risk. Monitor at the Experian Business credit dashboard ($39/month). The Smart Business Reports plan includes alerts for changes.
• Equifax Business Credit Risk Score. 600+ is acceptable for most lenders. Equifax does not offer a self-monitoring product comparable to D&B or Experian; lenders pull the report directly when needed.
• Annual review of all three reports. Errors are common, especially address mismatches and account-level reporting gaps. Disputes go through each bureau separately, and a clean dispute usually resolves within 30 days.

After 12 months of consistent reporting, an LLC with PAYDEX 80+ and Intelliscore 76+ qualifies for unsecured business lines of credit, larger Net 30 limits with major suppliers, and lower deposits on commercial leases and utility accounts. The credit profile becomes a long-term asset that compounds with each additional reporting account.

The address rule across the credit-building stack

Every step of the business credit ladder runs through the same address verification system. The bureaus, the vendors, and the issuers all check whether the LLC operates at a real commercial location. The check is automated for most applications and manual for flagged applications. The same address has to work across every step.

The seven-city table below covers the save office locations that pass each verification layer. Each address has a license agreement on file with the LLC as the licensee, a USPS commercial classification, and an answerable business phone routed to the location. The 24-hour activation means the DUNS application can be submitted within a week of LLC formation, and the full credit-building ladder can complete in six months from formation.

Where save office fits the business credit ladder

A real commercial business address is the foundation that the rest of the credit ladder runs on. Without it, the DUNS application fails, the Net 30 vendor applications get flagged, the bank account onboarding gets manual review, and the credit card issuers reject. With it, every step in the ladder runs cleanly.

save office provides the commercial-classified address with a license agreement, the answerable business phone, and the 24-hour activation that fits the timeline of building business credit from LLC formation. The companion guide on the three business addresses every LLC needs covers how the principal business address, the registered agent address, and the mailing address fit together. The address-checker tool checks whether a proposed address passes the USPS commercial classification check that D&B and Net 30 vendors run.