How a Business Line of Credit and Overdraft Work
How a Business Line of Credit Works | Switchboard Finance
Business Owners
Line of Credit · Overdraft · Revolving Limit
How a Business Line of Credit and Overdraft Work
A line of credit is not a lump-sum business loan, and it is not quite an overdraft either. It is a revolving limit you draw, repay and redraw as your cash flow moves. Here is how each facility is built, priced and read by a lender.
Quick Answer
A business line of credit gives you a revolving limit you can draw, repay and redraw as cash flow moves, with interest on the drawn balance only. It is not a lump-sum loan, and not quite an overdraft. Here is how each facility is built and priced.
What a business line of credit actually is
A business line of credit is a revolving limit: an approved ceiling you can draw against, repay, and draw again, without reapplying each time. That single feature is what sets it apart from a term loan, where the money lands once as a lump sum and you repay it down on a fixed schedule. With a revolving facility you draw, repay, redraw, without reapplying, so the limit sits behind your account as standby cash you only tap when the timing gap opens up.
The misconception worth clearing early is that a line of credit is just a bigger overdraft, or a loan by another name. It is neither. It is its own facility, with its own limit, and you pay interest on the drawn balance only, not on the full approved amount. For the wider backdrop on how business borrowing is set up, the corporate regulator lays out the basics for operators in its guidance for business and companies, and it is worth understanding your obligations before you take on any revolving debt.
Used well, a line of credit smooths the classic self-employed problem: money earned but not yet received. That is the same cash flow timing gap a working capital facility targets, but a revolving limit solves it on a rolling basis rather than as one fixed advance.
How the mechanics work: limit, drawn balance and the undrawn portion
The mechanics come down to three numbers: the approved limit, the drawn balance, and the undrawn portion. You are charged interest on the drawn balance only, so a facility sitting idle costs little to hold. When you draw to cover wages or stock, interest starts on that drawn amount; when the customer pays and you sweep the balance back down, the interest stops. This is the draw, repay, redraw rhythm that makes a revolving limit suit a business with recurring, self-correcting gaps rather than one large one-off cost.
One point that surprises owners is that the undrawn limit still counts. When you later apply for a home loan or another facility, a lender generally counts the full approved limit, not only what you have drawn today, because the room to draw is always there. Where this commonly lands is an owner holding a large unused limit "just in case", only to find it quietly trims borrowing power elsewhere. Sizing the limit to the real gap, rather than the biggest number on offer, keeps that headroom protected.
Where a revolving limit earns its keep
- Seasonal or recurring cash flow gaps that open and close
- Covering wages, stock or a BAS bill between customer payments
- You return the balance to zero regularly as inflows land
- You want standby funds without paying to hold them idle
- Predictable inflows you can time your draws against
Where a revolving limit costs you
- Funding an ongoing shortfall the business never climbs out of
- A single large purchase better matched to a term loan
- The balance never returns to zero, so it becomes permanent debt
- Using the limit to cover trading losses rather than timing
- No clear repayment source sitting behind each draw
Line of credit versus overdraft: the real difference
The core difference is structural: an overdraft attaches to the account, a line of credit stands alone. An overdraft lets your everyday transaction account dip below zero up to an agreed limit, so it is bolted onto the account you already run. A line of credit is a separate facility with its own limit that you draw from deliberately. Both are revolving, and both charge interest only on what you use, but they are read and sized differently.
An overdraft typically runs smaller and is tied to how your account has behaved, while a line of credit is often sized to current revenue, not a two-year average, varies by lender, which can matter for a business that has grown recently. What I check first with a revolving facility is whether the limit matches the real size of the timing gap, because an oversized limit costs borrowing power and an undersized one leaves you short at the worst moment.
When a revolving facility fits, and when to step up
A revolving facility fits when your gap is recurring and self-correcting: the money comes in, you just need to bridge the wait. That is the sweet spot for a business line of credit or an overdraft. When the need is a single larger outlay, or an ongoing gap that does not close on its own, a term facility usually fits better, which is why it helps to read the mechanics of a plain business loan alongside a revolving one.
There is also a ceiling on unsecured revolving credit. Past a certain point a lender will want property security, and that is where a second mortgage can lift the available limit well beyond an unsecured line, using equity you already hold. If you are weighing that step, the way a second mortgage works is worth understanding before you commit.
The backdrop to all of this is the shift toward non-bank lenders, who have been filling the core-borrowing demand that the major banks have pulled back from. That means more revolving options sized to how a business actually trades, and it is a big part of why matching the facility to the cash cycle matters more than chasing the lowest headline number. A broker can map the whole business owners finance picture with you rather than one product at a time.
A business line of credit and an overdraft both give you revolving standby cash, and both charge interest on what you draw, but they are built differently: an overdraft rides on your transaction account, while a line of credit stands alone with its own, usually larger, limit. The right one depends on the shape of your gap. Recurring and self-correcting suits a revolving facility, while a one-off or ongoing need often points to a term loan or a secured step-up.
Key takeaway: match the size and type of facility to the real shape of your cash flow gap, not to the biggest limit you can get approved.Frequently Asked Questions
The difference between a line of credit and a business overdraft is mainly structural: an overdraft attaches to your transaction account and lets it dip below zero, while a line of credit is a standalone facility with its own limit that you draw from deliberately. Both are revolving and both charge interest only on what you use, but a line of credit is usually larger and sized to your revenue, where an overdraft is often smaller and tied to account conduct. For a bigger or ongoing need, a line of credit generally gives you more room.
Interest on a business line of credit is charged on the drawn balance only, not on the full approved limit, so an unused facility costs very little to hold. When you draw to cover a cash flow gap, interest accrues on that amount until you repay it, then it stops. Rates are typically variable and vary by lender, so it is worth comparing the ongoing cost, not just the headline rate.
A business line of credit can be arranged without property security up to an unsecured ceiling that varies by lender, based on your trading history and account conduct. Beyond that ceiling, a lender usually wants security, and a second mortgage over property you already own can lift the limit well past what an unsecured facility allows. Which path fits depends on how large a limit you need and the equity available.
A business line of credit limit is decided mainly on your revenue, account conduct and the security offered, and it is commonly sized to current turnover rather than a two-year average, which varies by lender. A lender wants to see that the limit is proportionate to the timing gaps in your working capital cycle, not just the largest number you could justify. Speaking to a broker before you apply helps you request a limit that supports serviceability elsewhere.
A business line of credit is one form of working capital finance, but the two are not identical: working capital finance is the broader category, and a line of credit is the revolving version of it. A term working capital loan advances a fixed sum you repay on a schedule, while a line of credit lets you draw, repay and redraw against a limit. For a recurring gap the revolving option often fits better, and for a one-off need the term option usually does.
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