If you run a business, there are two credit scores that decide what you can borrow, what cards you can carry, and how much your business pays for capital. One you already know: your personal FICO. The other (your business credit score) is the one most owners ignore until a lender asks for it. The relationship between the two is the part almost nobody explains correctly, and it's where the real strategy lives.

This piece walks through both scores, how they interact, which card issuers report business activity to your personal credit and which ones quietly keep them separate, and why business credit cards are one of the most underrated tools in a points-and-miles wallet. The framing throughout is what actually applies to you when you're sitting at the application page deciding whether to hit submit.

Score one: your personal FICO still matters

Your personal FICO score (the 300-850 number from Experian, Equifax, and TransUnion) doesn't stop mattering when you start a business. For sole proprietors and single-member LLCs in particular, lenders treat you and the business as effectively the same credit entity. Even if your business has revenue, employees, and a checking account, most lenders will pull your personal FICO before approving a loan, a line of credit, or a business card.

This holds even for incorporated businesses with established business credit. Chase, American Express, Citi, Capital One, US Bank, and Bank of America all run a personal credit pull when you apply for a business card. The personal-guarantee clause buried in almost every small-business credit agreement is the reason: if the business defaults, your personal credit is on the hook. From the issuer's point of view, your personal FICO is the underwriting backstop, so they're going to look at it.

Practical implication: if you're planning to apply for business cards in the next twelve months, protect your personal FICO the same way you would before any major personal-card run. Keep utilization under 10% on personal cards in the statement cycle before you apply, avoid hard inquiries you don't need, and don't close your oldest personal account.

Score two: your business credit score (it's actually several scores)

Business credit is fragmented across bureaus in a way personal credit isn't. There's no single 300-850 equivalent. Instead, four scores show up most often:

Dun & Bradstreet PAYDEX. A 1-100 score based almost entirely on how promptly you pay vendors and suppliers. A PAYDEX of 80 means you pay on time. Above 80 means you pay early. D&B issues a free identifier called a DUNS number that links your trade activity to your business profile, and most government contracting and large-vendor relationships start with a DUNS number.

Experian Business Credit Score. Also 1-100. Factors in payment history, credit utilization on business accounts, length of credit history, public records, and demographic data about your business. More similar in feel to a personal FICO than the D&B score is.

Equifax Business Credit Risk Score. Runs 101-992. Commercial credit risk model used heavily by banks underwriting business lines of credit and equipment financing. Higher is better; above 700 is considered low risk.

FICO SBSS (Small Business Scoring Service). Runs 0-300. This is the one the SBA uses to pre-screen 7(a) loans, and many community banks use it for business loans under $1 million. The SBA's minimum SBSS for most 7(a) applications is 155. It blends personal and business credit data, which is the cleanest official acknowledgment that the two scores are linked.

You don't need all four to be perfect. For most points-focused readers, the practical move is to get a DUNS number, establish a couple of vendor accounts that report to D&B, and let the rest follow. Lenders that care about Experian or Equifax business scores are usually working off the data those bureaus already collect from your trade lines.

The intersection: what your business card actually reports

Here's the part that costs people money when they get it wrong. Your business credit card pulls your personal FICO at application. Whether the card then reports ongoing activity (balances, payments, utilization) back to your personal credit varies by issuer, and the differences are substantial.

Chase business cards. Activity does not report to personal credit. The application pull is the only personal-credit event. Balances, utilization, and payment history report only to business bureaus. This is a meaningful advantage if you put heavy spend on a business card.

American Express business cards. Same as Chase. Application is a personal pull; ongoing activity stays on the business side. (Amex Plum and other charge products follow the same pattern.)

Capital One business cards. Activity does report to personal credit. Balances and utilization show up on your personal report the same way a personal card would. If you carry a balance on a Capital One Spark card, that balance counts against your personal utilization ratio.

US Bank business cards. Activity reports to personal credit. Same pattern as Capital One.

Bank of America business cards. Mixed by product. Some report to personal, some don't. The application disclosures are the authoritative source; check them before applying.

Citi business cards. Generally don't report ongoing activity to personal credit, but Citi's small-business lineup has thinned in recent years, so confirm at the application page.

Why this matters: if you're running $5,000 a month through a business card and the issuer reports to personal credit, your personal utilization ratio looks much higher than it actually is from a household-finance standpoint. Chase and Amex business cards let you push spend without dragging your personal score. Capital One business cards don't.

The 5/24 angle

Chase's unwritten 5/24 rule (no new Chase cards if you've opened five or more cards from any issuer in the last 24 months) counts personal cards but does not count most business cards. That includes business cards from Chase itself. If you open the Ink Business Preferred, that application doesn't add to your 5/24 count from Chase's perspective, even though Chase pulled your personal credit to underwrite it.

For someone working through a personal-card sequence (Sapphire Preferred, Freedom Flex, Freedom Unlimited), this is the lever. You can add an Ink card every three to six months without burning a 5/24 slot. The Ink Business Preferred carries a 120,000-point Ultimate Rewards welcome bonus at $8,000 spend in three months. The Ink Business Cash and Ink Business Unlimited carry 75,000-point bonuses with smaller spend thresholds. Stacked across two or three Ink cards in a year, that's 270,000-plus Ultimate Rewards points without giving up a single 5/24 slot.

The same dynamic applies to Amex Business Platinum (250,000 Membership Rewards welcome bonus offers have shown up multiple times in 2025-2026) and to Capital One Spark Cash Plus (200,000 miles on $30,000 in three months has been a recurring offer). Capital One business cards do report to personal credit, so factor that in, but the welcome bonus is sized for it.

How to actually build business credit, in order

If you're starting from zero, this is the sequence that works:

  1. Form a legal entity. LLC or S-corp. A sole proprietorship technically can have business credit, but vendors and lenders take you more seriously with formal structure. State filing fees range from $50 to $500.

  2. Get an EIN from the IRS. Free, online, takes ten minutes. The EIN is the business equivalent of an SSN.

  3. Open a business bank account. Use the EIN. Run all business income and expenses through this account. Mixing personal and business funds (commingling) defeats the purpose of separating credit and creates real tax and liability problems.

  4. Apply for a DUNS number from Dun & Bradstreet. Free. Takes a few weeks to issue. This is your D&B identifier.

  5. Establish trade credit with vendors that report. Uline, Quill, Grainger, Crown Office Supplies, and Summa Office Supplies all offer Net 30 terms and report to D&B. Open accounts, place small orders, pay promptly. Three to five reporting trade lines is usually enough to establish a PAYDEX score.

  6. Apply for a business credit card. With six months of bank activity and a couple of trade lines, you're a viable applicant for most issuers. Start with a card that doesn't report to personal credit if you want to preserve your personal score (Chase Ink line, Amex Business cards).

  7. Apply for a business line of credit from your bank. After six to twelve months of consistent business banking and on-time card payments, your bank will usually offer a line of credit. This is where the SBSS score starts to matter.

The whole sequence runs four to nine months if you stay on top of it. Most owners stall at step five because trade lines feel like busywork. They aren't. A PAYDEX of 80 on three reporting vendors is what makes step seven (the bank line of credit) a yes instead of a maybe.

A worked example: the Chase-stack play

Picture an LLC owner running $4,000 in monthly business spend (software, ads, contractor payments). She has a personal Sapphire Preferred, a Freedom Unlimited, and a Freedom Flex. She's at 3/24.

She opens the Ink Business Preferred. Personal credit pull, no 5/24 ding because it's a business card. $8,000 in spend over three months earns the 120,000-point welcome bonus, which she hits comfortably in two months at her normal $4,000/month run rate. Ongoing spend earns 3x on the first $150,000 in combined travel, shipping, internet/cable/phone, and online advertising categories. Across a year of $4,000-a-month business spend with most of it falling into bonus categories, that's another 100,000-plus Ultimate Rewards points on top of the welcome bonus.

None of that activity touches her personal credit utilization. Her personal FICO stays clean for the next personal-card application. The Ink card sits on her business credit reports, where the building activity helps her PAYDEX and Experian Business scores.

Six months later, she adds the Ink Business Cash (75,000-point bonus, $6,000 spend) and shifts a chunk of her ongoing business spend to it for the 5x category bonuses on office supplies and internet/cable/phone. Same dynamic: personal pull at application, no 5/24 hit, no ongoing personal-credit impact.

In a calendar year of running the play, she's added roughly 270,000 Ultimate Rewards points (worth $4,000-plus when transferred to airline and hotel partners) without touching her 5/24 count or her personal utilization. That's the value of understanding the personal-versus-business reporting split.

Common gotchas

A few things to know before you apply for anything:

The personal-guarantee clause is in nearly every small-business credit agreement. Your personal credit is on the hook if the business defaults, regardless of which scores the card reports to in good standing. Limited liability protects you from operating debts; it does not protect you from credit obligations you personally guaranteed.

Small-business loans pull both personal and business credit at application. The SBA's 7(a) program uses the SBSS, which blends the two. There's no clean way to keep them separate at the loan-underwriting stage.

Closing a business card behaves differently from closing a personal one. Because Chase and Amex business cards don't report to personal credit while open, closing them doesn't ding your personal FICO the way closing a personal card with a long history would. That makes business cards easier to churn through annual-fee cycles. (Capital One business cards, which do report, behave more like personal cards on closure.)

Inactivity can cause an issuer to close a business account. If you're sitting on an Ink card and haven't used it in eight months, run a small charge through it. A closed account from inactivity does affect your business credit history, even if it doesn't touch personal.

Quick reference: where each score lives

Your personal FICO sits at Experian, Equifax, and TransUnion. Free monitoring through your card issuer's tools (Chase's free credit dashboard, Amex MyCredit Guide, Capital One CreditWise) is enough for most readers. You'll see your VantageScore or FICO 8 score, not all 10-plus FICO variants lenders use, but the trend lines are close enough to act on.

Your business credit lives at D&B (PAYDEX, free DUNS lookup), Experian Business (paid reports), Equifax Business (paid reports), and FICO (SBSS, accessed through lenders rather than direct). Nav and similar services aggregate business credit data and sell monitoring packages; the free tier shows enough to know where you stand.

If you take one thing from this piece, take this: the personal-versus-business credit separation is real but partial. Chase and Amex business cards let you spend without touching personal utilization, which is the cleanest tool in the toolbox for someone running heavy business spend. The 5/24 dodge on business cards is worth at least 200,000 transferable points a year if you're working a card sequence. And the personal-guarantee clause means your personal credit still backs everything you sign, no matter what name is on the card.

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