What a Line of Credit Actually Is
A business line of credit is an approved borrowing limit you can tap whenever you need to, rather than a lump sum handed to you all at once. Think of it less like a loan and more like a reusable pool of money that sits ready.
Say a lender approves you for a $100,000 line. That does not mean you owe $100,000 or pay interest on $100,000. It means you can borrow up to that amount, in whatever pieces you need, and you are only charged for what you actually take. Draw $15,000 to cover a slow month, and interest accrues on that $15,000 — not the rest.
This makes a line fundamentally different from a term loan. A term loan is a one-time lump sum with fixed payments. A line is flexible, reusable, and priced only on what is outstanding. If you want the head-to-head, we cover it in line of credit vs. business loan. This article is about how the line itself works, from the inside.
The Revolving Structure: Draw, Repay, Reuse
The defining feature of a line of credit is that it revolves. As you repay principal, that room opens back up and you can borrow it again — no reapplication needed. The line stays open for months or years, and you move in and out of it as your business demands.
Here is the cycle in practice. Suppose you have a $100,000 line and currently owe nothing, so your available credit is the full $100,000:
- You draw $40,000 to buy inventory. Available credit drops to $60,000, and you begin accruing interest on the $40,000.
- A month later you repay $25,000 of principal. Your balance falls to $15,000, and available credit climbs back to $85,000.
- Interest now accrues only on the remaining $15,000. When you pay that off, you are back to a zero balance and the full $100,000 is available again.
That reusability is the whole appeal. A term loan, once repaid, is finished; you would apply again from scratch. A line just resets, ready for the next need.
How Interest Accrues — a Worked Example
This is the part owners most often misunderstand, so it is worth doing the math slowly. On a line of credit, interest is charged only on your drawn balance, and only for the days that balance is outstanding.
Assume an 18% annual rate. A rough way to think about it: 18% a year is about 1.5% a month, or roughly 0.05% per day on whatever you owe.
- You draw $20,000 on the 1st of the month and carry it for the full month. Interest is about 1.5% of $20,000, or roughly $300.
- Halfway through the month you draw another $10,000. That second draw only accrues interest for the days it is outstanding — about half a month — so it adds only around $75, not $150.
- If you had instead repaid the original $20,000 on day 15, you would owe interest on it for only 15 days — roughly $150 — because the balance went to zero for the second half.
Contrast that with a $30,000 term loan at the same 18%, where you pay interest on the full balance every month until it is retired, whether you are using the money or not. The line rewards you for borrowing narrowly and repaying quickly; the term loan does not. That is precisely why a line suits short, uneven needs and a term loan suits long, steady ones.
Fees to Watch: Draw, Maintenance, and Inactivity
The interest rate is not the whole cost of a line. Depending on the lender, several fees can apply, and they vary widely — some fintech lenders stack them, while many banks charge few or none. Read the agreement closely for:
- Draw fees. A small percentage — often around 1% to 3% — charged each time you pull funds. If you draw frequently, this adds up and can quietly raise your effective cost well above the stated rate.
- Maintenance or monthly fees. A flat charge to keep the line open, whether or not you use it. On a lightly used line, a monthly fee can dominate the cost.
- Inactivity fees. The opposite problem — a charge for not drawing over some period. Some lenders want the line used; others penalize dormancy.
- Origination or annual fees. An upfront or yearly charge for having the facility at all.
When you compare two lines, do not stop at the interest rate. A line with a lower rate but a per-draw fee can easily cost more than a slightly higher-rate line with no draw fees, depending on how you actually use it. Model your realistic usage against each fee structure.
Secured vs. Unsecured Lines
Lines come in two flavors, and the difference affects both your rate and your risk.
A secured line is backed by collateral — accounts receivable, inventory, equipment, or a cash deposit. Because the lender has something to recover if you default, secured lines usually carry lower rates and higher limits. The trade-off is that you are pledging assets, and the lender can claim them if things go wrong.
An unsecured line requires no specific collateral, which makes it faster and simpler to open. But lenders price that added risk into a higher rate and typically a lower limit, and they lean harder on your credit and revenue to qualify you. Many unsecured lines also come with a personal guarantee, meaning you are personally on the hook even without pledged assets — so "unsecured" does not mean "no personal risk."
Bank Lines vs. Fintech Lines
Where you get a line shapes almost everything about it — the rate, the limit, the speed, and how hard it is to qualify.
| Factor | Bank / Credit Union Line | Fintech / Online Line |
|---|---|---|
| Typical rate (mid-2026) | Low end, often ~8%–15% | Higher, often ~15%–25%+ |
| Credit limits | Can be larger for strong borrowers | Often more modest, tied to revenue |
| Funding speed | Slower — days to weeks to set up | Fast — sometimes 24–48 hours |
| Qualification | Stricter: strong credit (often 680+), longer history, more documents | More lenient: often 600+ credit, 6+ months in business |
The pattern mirrors the rest of business lending: banks reward strong, established borrowers with the best pricing but demand more and move slowly, while fintech lenders trade a higher rate for speed and easier qualification. If your credit and time in business are strong and you can wait, a bank line is usually the cheaper choice. If you need money fast or do not yet meet bank standards, a fintech line fills the gap. This is the same trade-off you will see across all your financing options.
How Your Credit Limit Is Determined
Lenders size your line to what your business can safely support and repay. The main inputs are:
- Revenue. The biggest driver. A line is often set as a fraction of annual or monthly revenue, since your ability to repay comes from cash flow.
- Time in business. A longer track record generally supports a larger line. Newer businesses see tighter limits.
- Credit profile. Both your business and personal credit affect the limit and the rate.
- Collateral, for secured lines. The value of pledged assets — receivables, inventory — can directly cap how much a secured line will extend.
- Bank activity. Consistent deposits, healthy average balances, and few overdrafts all argue for a higher limit.
If you want to understand the broader math lenders use to gauge how much any business can handle, our guide on how much you can borrow breaks it down.
Renewal and Review Cycles
A line of credit is not necessarily open forever. Most lenders review lines periodically — often annually — to decide whether to renew, raise, lower, or close them. At renewal they will typically look again at your revenue, your repayment behavior, and your updated financials.
Two practical implications follow. First, using the line responsibly — drawing, repaying on time, not sitting maxed out — builds a case for a higher limit and better terms at renewal. Second, a line can be reduced or pulled if your business weakens, so it is not a guaranteed backstop in a downturn. Treat an open line as a tool to manage actively, not a permanent entitlement.
Smart Uses vs. Misuse
A line is a precision tool, and it shines on short-term, revolving needs:
- Bridging cash-flow gaps — covering payroll or rent during a slow stretch, then repaying when receivables come in.
- Seasonal inventory — stocking up before a busy season and paying the line down as sales arrive.
- Handling emergencies — a burst pipe, an urgent repair, an unexpected bill — without draining your operating account.
- Seizing short opportunities — a bulk-discount buy or a quick project you will recoup within weeks.
The classic misuse is funding long-lived assets with a revolving line. Buying equipment, financing a buildout, or covering a multi-year expansion with a line means carrying a balance for years at a rate meant for short cycles — usually higher than a term loan, and without the discipline of a fixed payoff date. Match the tool to the timeline: short and uneven needs to a line, long and defined purchases to a term loan.
How a Line Affects and Builds Business Credit
Used well, a line of credit strengthens your business credit profile. Most lenders report to business credit bureaus, so consistent, on-time repayment builds a positive history that makes future borrowing easier and cheaper. A line also adds to your available credit, and keeping your drawn balance low relative to the limit — a healthy utilization ratio — reflects well on your profile.
The reverse is also true. Running the line maxed out for long stretches, or missing payments, can drag your business credit down and jeopardize the line at its next review. The habits that build credit here are the same ones that keep the line healthy: borrow deliberately, repay promptly, and do not treat the limit as money you are meant to fully spend.
Qualification Requirements
Requirements vary by lender, but a typical marketplace-level line looks for:
- 6+ months in business (banks often want more).
- Around $150,000+ in annual revenue, or roughly $10,000+ per month.
- A credit score of 500+ for many online lenders, though banks commonly want 680+ for their best lines.
- An active business bank account with consistent deposit activity.
The stronger each of these, the higher your limit and the lower your rate. Thin revenue, a short history, or a low score will not necessarily disqualify you, but they will push you toward fintech lenders and higher pricing.
iAdvance Now is a small-business funding marketplace and broker — not a bank or direct lender. With 80+ lending partners, a single application and a soft credit pull that does not affect your score let you compare real line-of-credit offers side by side rather than applying to lenders one at a time. If you want to see what your business qualifies for, you can start an application with no obligation.
Frequently Asked Questions
Do I pay interest on my whole credit limit?
No. You only pay interest on the amount you have actually drawn, and only for the days it is outstanding. If you have a $100,000 line but have drawn $10,000, you accrue interest on $10,000. The unused portion sits available at no interest cost, though some lenders do charge a separate maintenance or inactivity fee regardless of use.
What can I use a business line of credit for?
It is best suited to short-term, recurring, or unexpected needs: bridging cash-flow gaps, buying seasonal inventory, covering emergencies, or grabbing a quick opportunity. It is a poor fit for long-lived purchases like equipment or a major expansion — those belong on a term loan, which typically carries a lower rate and a fixed payoff schedule.
Is it hard to qualify for a line of credit?
It depends on where you apply. Bank lines are stricter, often wanting strong credit (680+), a longer track record, and more documentation. Online and marketplace lenders are more lenient — many work with 6+ months in business, roughly $150,000+ in annual revenue, and credit scores from 500 or 600 up — in exchange for a higher rate.
Does a business line of credit help build business credit?
Yes, when you use it responsibly. Most lenders report to business credit bureaus, so on-time repayment builds a positive history, and keeping your drawn balance low relative to your limit reflects well on your profile. Carrying a maxed-out balance or missing payments does the opposite and can put the line itself at risk when the lender next reviews it.