Business Line of Credit Calculator

What Is a Business Line of Credit?

A business line of credit (LOC) is a revolving credit facility that lets a business borrow up to an approved limit, repay, and borrow again — much like a credit card but at far lower rates. Unlike a business term loan that delivers a lump sum with fixed monthly principal-and-interest payments, a line of credit is designed for ongoing, unpredictable funding needs. You only pay interest on the amount you actually carry as a balance, not on the unused portion of the line.

Typical use cases include bridging working capital gaps while waiting on accounts receivable, purchasing seasonal inventory ahead of a sales cycle, covering payroll during a slow month, or having an emergency fund for unexpected expenses such as equipment repairs. Most small and mid-sized businesses keep a line of credit open even when the balance is zero, because having fast access to capital matters more than the modest annual maintenance fee. Lenders generally structure the facility in two phases: a draw period (often 6 to 24 months for online lenders, up to 5 years for bank lines) during which you can borrow and repay repeatedly while making interest-only payments, followed by a repayment period in which the outstanding balance amortizes into fixed principal-and-interest payments over a set term.

Business LOC vs. Term Loan vs. Credit Card

These three products solve different problems. Picking the wrong one is one of the most expensive mistakes a small business owner can make.

For larger, asset-backed needs with longer terms, also consider an SBA CAPLines facility, which is a government-backed revolving line for similar use cases but with lower rates and higher qualification bar.

Types of Business Lines of Credit

Not every business LOC is the same. The four common variants differ in cost, speed, and risk:

• Bank line of credit: Offered by traditional banks and credit unions. Lowest rates (typically prime + 1–5pp), highest limits (up to $1M+ for established businesses), but strict underwriting — usually 2+ years in business, $250k+ revenue, and 680+ personal credit. Approval can take 2–6 weeks.
• Online / fintech line of credit: From lenders such as BlueVine, Fundbox, OnDeck, Kabbage. Faster approval (often same day), more lenient qualifications (600+ credit, $100k+ revenue), but higher rates (typically 15–25% APR) and lower limits ($10k–$250k).
• SBA CAPLines: A revolving line of credit backed by the SBA 7(a) program. Lowest rates (prime + 1.5–2.75%) and limits up to $5 million, but the application is as demanding as a full SBA 7(a) loan and can take 4–10 weeks. Best for businesses that qualify and need a long-term revolving facility.
• Asset-based line of credit (ABL): Secured by accounts receivable, inventory, or equipment. Rates are typically lower than unsecured online lines because the lender has collateral. Used by businesses with strong AR but uneven cash flow, such as B2B service firms and wholesalers.

Typical Business LOC Rates and Fees

Business line of credit pricing in 2026 is built on the prime rate (about 8.5% as of mid-2026) plus a margin that reflects the lender's risk assessment of your business:

• Bank LOC APR: 8% – 15% (prime + 0.5pp – 5pp). Reserved for established businesses with strong financials.
• Online LOC APR: 15% – 25% (prime + 6pp – 15pp or factor-rate equivalent). Higher because underwriting is faster and loss rates are higher.
• SBA CAPLines APR: prime + 1.5% – 2.75%, the lowest tier for qualified borrowers.

Beyond interest, watch for these fees that can materially raise your effective cost:

• Draw fee: 0.25% – 1% of each draw (common with online lenders; rare at banks).
• Annual maintenance fee: $100 – $500 per year, charged whether or not you use the line.
• Origination / setup fee: 0% – 1% of the credit limit at closing.
• Inactivity fee: $250 – $500 if the line is unused for 12 consecutive months — designed to discourage borrowers from parking unused credit lines.

How Lenders Qualify You

Underwriting for a business LOC focuses on five signals. Most lenders require minimums on each, and a weakness in one area can usually only be offset by strength in another:

• Time in business: 12+ months minimum for most lenders; 24+ months preferred by banks. Startups generally cannot qualify and should seek SBA microloans or founder personal loans instead.
• Annual revenue: $100k+ minimum for online lenders, $250k+ for most banks, $500k+ for larger lines. Lenders ask for 3–6 months of business bank statements to verify.
• Personal credit score: 680+ for traditional banks, 600+ for online lenders. The personal guarantee is standard on nearly all small-business LOCs, so personal credit matters as much as business credit.
• Business credit (PAYDEX): 80+ on Dun & Bradstreet for bank lines. Building business credit takes 12–24 months of on-time trade-line payments.
• Debt service coverage ratio (DSCR) and DTI: Lenders want a DSCR of at least 1.25 (operating income covers debt payments 1.25 times over) and a personal debt-to-income ratio below 43%.

Smart Uses (and Risks)

A line of credit is the right tool when used for short-term, revenue-generating needs:

• Working capital gaps: Bridging the 30–60 days between delivering work and getting paid.
• Inventory purchasing: Buying stock ahead of a peak season that will sell through within 60–90 days.
• Emergency fund: Covering unexpected equipment repairs or a one-time tax payment.
• Bridging accounts receivable: Smooths cash flow when large B2B clients pay on net-60 or net-90 terms.

The risks come from using a LOC for the wrong purpose:

• Long-term assets: Using a LOC to buy equipment or vehicles that take 3–7 years to pay back is a classic trap. Use a term loan or equipment financing instead — the repayment term should match the asset's useful life.
• Interest compounding: If you only pay the minimum each month during draw, the balance never shrinks and interest keeps accruing on the full amount. Schedule principal paydowns whenever cash flow allows.
• Personal guarantee: Nearly every small-business LOC requires a personal guarantee, which means your personal assets (home, savings) are at risk if the business defaults. Read the guarantee carefully — some are joint and several, others are limited.
• Rate resets: Most business LOCs are variable rate. A 2–3 percentage point rise in prime can push an affordable payment into one that strains cash flow.

Worked Example: $60,000 Balance at 10% APR, 24-Month Draw + 24-Month Repayment

Business LOCs have two phases with very different math. Here is the business line of credit calculator's default scenario: average balance used $60,000, rate 10.0%, draw period 24 months, repayment period 24 months.

Phase 1 — Draw period (interest only)

During draw you pay interest only on the carried balance:

Monthly interest = $60,000 × (0.10 ÷ 12) = $60,000 × 0.008333 = $500.00/month

Over 24 months of draw, you pay 24 × $500.00 = $12,000.00 in interest — and the $60,000 principal is still owed in full.

Phase 2 — Repayment period (fully amortized)

At repayment start, the $60,000 balance is amortized over 24 months at the same 10% rate:

M = 60000 × [0.008333 × (1.008333)24] / [(1.008333)24 − 1]

(1.008333)24 ≈ 1.2204, giving M ≈ 60000 × 0.008333 × 1.2204 / 0.2204 ≈ $2,768.70/month.

Total over 24 months of repayment: $2,768.70 × 24 = $66,448.69, of which interest is $66,448.69 − $60,000 = $6,448.69.

Monthly payment jumps from $500.00 to $2,768.70 the moment draw ends — a 5.5× increase. This "payment shock" is what catches business owners off guard if they have not modeled the repayment phase.

Total Cost of Both Phases

• Total interest: $12,000.00 (draw) + $6,448.69 (repayment) = $18,448.69
• Total payments over 48 months: $18,448.69 interest + $60,000 principal = $78,448.69

Verify in Excel or Google Sheets

Draw period monthly interest: =60000*0.10/12 → $500.00

Repayment-period payment: =PMT(0.10/12, 24, -60000) → $2,768.70

Assumptions & Limitations

• Models a fixed rate for both phases. Real business LOCs are variable (prime + margin). Run the business line of credit calculator at multiple rate scenarios (today's rate, +2%, +4%) to see the range of possible repayment payments.
• Assumes you carry a constant average balance during the draw period. If your usage fluctuates month to month, your real draw-period interest will vary; the business line of credit calculator reports an estimate based on the average you enter.
• Assumes zero principal paydown during draw. Making principal payments during draw reduces both the repayment balance and the eventual payment shock.
• Excludes draw fees (0.25%–1% per draw on many online LOCs), annual maintenance fees ($100–$500), and origination fees (0%–1% of the credit limit).
• Does not model inactivity fees ($250–$500 after 12 months of no use) or renewal fees some lenders charge at the end of each draw period.

Sources & Editorial Standards

This business line of credit calculator models the two-phase structure common in the U.S. small-business market: an interest-only draw period (typically 6–24 months) followed by a fully amortizing repayment period (12–60 months). The draw-period calculation is simply average balance × (annual rate / 12); the repayment period uses the standard amortization formula M = P × r(1+r)n / ((1+r)n − 1). We do not model variable-rate LOCs that reset with the prime rate on a specific schedule — instead, run the business line of credit calculator at multiple rate scenarios to see the range of possible repayment payments.

Primary sources for business LOC data and guidance:

• IRS Publication 535 — Business Expenses — tax treatment of business interest expense under IRC Section 163.
• SBA — Finance Your Business (CAPLines) — government-backed revolving line of credit program details and eligibility.
• Federal Reserve Small Business Credit Survey — annual data on small-business credit access, denial rates, and LOC usage.
• CFPB Small Business Lending Rule — Section 1071 fair-lending data collection requirements that apply to business LOC lenders.
• FDIC — Small Business Lending — bank call-report data on small-business LOC origination volumes and pricing.

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