Working Capital Line of Credit: What It Is and How Much You Need

A working capital line of credit is a revolving credit line your business uses to pay day-to-day operating costs, such as inventory, payroll and supplier bills, while you wait for customers to pay. You draw only what you need, pay interest only on the drawn balance, and your available credit is restored as you repay.

The hard part isn't understanding what it is. It's knowing how big a line you actually need, and which structure fits your cash cycle. This guide walks through both, with a free sizing calculator built on your own inventory, receivable and payable days.

Quick answer: most businesses should size a working capital line to cover the cash tied up in inventory and receivables, minus supplier credit, plus a buffer for their busiest month. For a $4M business with a 75-day cash cycle, that is often $700,000 to $900,000.

What Is a Working Capital Line of Credit?

Working capital is the money that keeps a business running between paying for things and getting paid for them. A working capital line of credit is a business line of credit set up specifically to fund that gap.

Banks often use the name for a specific product: a revolving line tied to your receivables and inventory, renewed every year. Online lenders and fintech providers use it more loosely for any short-term revolving line. Either way, three features define it:

• Revolving: you can draw, repay and draw again up to your limit.
• Short-term: each draw is meant to be repaid within months, from the cash the business generates.
• Interest on use: you pay interest only on the amount drawn, not on the full limit.

How a Working Capital Line of Credit Works

A typical cycle looks like this:

1. You get approved for a limit, for example $750,000, based on your financials.
2. You draw when a cash need comes up: a supplier deposit, a large purchase order, payroll before a big customer pays.
3. The cash comes back as inventory sells and customers pay their invoices.
4. You repay, and that amount becomes available to draw again.

Bank lines add a few mechanics that catch business owners off guard:

• Borrowing base. A secured bank line often caps what you can draw at a percentage of your eligible receivables and inventory, commonly around 80% of receivables and a lower share of inventory. Your approved limit and the amount you can actually draw are not always the same.
• Annual renewal. Most bank lines are reviewed each year. If your numbers slip, the bank can reduce the limit, raise the rate or close the line.
• Clean-up period. Many banks require the line to be paid down to zero for 30 days or so each year. This proves the line funds short-term needs, not a permanent cash shortfall.
• Covenants. Bank lines often come with financial covenants, such as minimum profitability or a maximum debt ratio, that you must report on regularly.

Unsecured lines, like Drip Flex Line, skip the borrowing base and the lien. The whole approved limit is drawable, and each draw is repaid on a fixed monthly schedule.

How Much Working Capital Line of Credit Do You Need?

The right size comes from your cash conversion cycle: how long your cash is tied up between paying suppliers and collecting from customers.

Cash conversion cycle = days inventory + days receivable − days payable

Turn that into dollars and you get your working capital gap:

• Cash in inventory = annual cost of goods sold ÷ 365 × days inventory sits
• Cash in receivables = annual revenue ÷ 365 × days customers take to pay
• Less supplier credit = annual cost of goods sold ÷ 365 × days you take to pay suppliers

Worked example: a distributor with $4M in revenue and 65% cost of goods sold. Inventory sits 60 days, customers pay in 45 days, and suppliers are paid in 30 days.

• Inventory: $2.6M ÷ 365 × 60 = $427,397
• Receivables: $4M ÷ 365 × 45 = $493,151
• Less payables: $2.6M ÷ 365 × 30 = $213,699
• Working capital gap: $706,849. With a 25% seasonal peak, that becomes $883,562.

If the business can put $150,000 of its own cash toward the gap, a line of about $730,000 covers the peak. Run your own numbers:

Two practical tips:

• Size for the peak, not the average. A line that only covers a normal month runs out exactly when you need it, in the weeks before your busy season.
• Shorten the cycle before you borrow more. Collecting 10 days faster or negotiating 15 more days with suppliers can cut your gap by tens of thousands of dollars. Use our inventory turnover calculator and Net 30 calculator to see where the days go.

Working Capital Line of Credit vs Working Capital Loan

Rule of thumb: if you can name the exact amount and date you need the cash, a working capital loan can work. If the need repeats or the timing is unpredictable, a line costs less because you only pay for what you use, when you use it.

What Is a Working Capital Line of Credit Used For?

These are the situations US business owners most often describe to our team:

• Seasonal inventory builds: "We need financing for the Q4 inventory build to carry us until the stock sells."
• Slow-paying customers: "Customers pay 20 to 50 days after shipment, but payroll, transport, insurance and taxes are due on different schedules."
• Supplier deposits: "Suppliers want prepayment, and our largest customer pays in 70 to 90 days."
• Duties and tariffs: "Can I use the line just to pay customs duty on containers I'm importing?"
• New contracts: "We need capital to mobilize upcoming contracts: hiring field crews and covering upfront costs."
• Payroll in slow months: smoothing wages and rent when revenue dips but costs don't.

What it's not for: buying property, long-term equipment, multi-year expansion or covering ongoing losses. Those need long-term financing or equity. A working capital line funds the timing of cash, not a business that's losing money.

Working Capital Line of Credit Rates and Costs

What you pay depends on who you borrow from:

• Banks usually price working capital lines as the Prime Rate plus a margin, set by your credit, collateral and relationship. This is the cheapest option when you qualify, but it comes with a lien, covenants and annual renewal.
• SBA-backed lines (CAPLines) carry rates capped by SBA rules, but take longer to arrange.
• Online and unsecured lenders charge more. Some quote a monthly rate or a factor rate instead of an APR, and some debit payments weekly or daily.

Beyond the rate, ask about draw fees, unused-line fees, annual or renewal fees and prepayment penalties. Our guide to hidden line of credit charges lists what to look for, and the line of credit calculator shows the real cost of a draw.

What it costs in practice: a $100,000 draw held for 60 days at 15% APR costs about $2,466 in interest ($100,000 × 15% × 60 ÷ 365). If that draw funds an order with a 25% gross margin, the order earns $25,000, so the financing cost is small next to the profit it unlocks.

Working Capital Line of Credit Requirements

Before you apply, pull your accounts receivable and payable aging reports, your last two years of financial statements and your current year-to-date numbers. Lenders size the line from these, so clean, current books get you a bigger limit faster.

Types of Working Capital Lines of Credit

• Secured bank line (asset-based): borrowing capacity tied to receivables and inventory. It's the lowest cost, but your assets are pledged and the limit moves with your borrowing base. See types of lines of credit.
• Unsecured line: approved on revenue, profitability and history, with no assets pledged. It costs more than a bank line, but it's faster, keeps your assets free and doesn't depend on a borrowing base.
• SBA CAPLines: SBA-guaranteed working capital lines offered through partner banks, including seasonal and contract-based versions. They're a good fit for businesses that just miss conventional bank criteria. See SBA 7(a) loan programs.
• Receivables-based lines: advances tied directly to specific invoices. They fit businesses whose main gap is slow-paying customers. Compare with invoice factoring.

Is a Working Capital Line of Credit Part of Working Capital?

Yes, on the liability side. Net working capital = current assets − current liabilities. Any balance you've drawn on the line is a current liability, so drawing $200,000 to buy inventory raises current assets and current liabilities by the same amount. Your net working capital doesn't change on day one.

The unused part of the line isn't on the balance sheet at all. Lenders, investors and suppliers still look at it, though, because available credit is liquidity you can call on. That's one reason many businesses open a line before they need it.

Frequently Asked Questions

What is a working capital line of credit?

A working capital line of credit is a revolving credit line a business uses to pay day-to-day operating costs such as inventory, payroll and supplier bills while it waits for customers to pay. You draw only what you need, pay interest only on the drawn balance, and your available credit is restored as you repay.

What is a working capital line of credit used for?

It covers short-term timing gaps: buying inventory ahead of a busy season, paying suppliers before customers pay you, meeting payroll during slow months, paying customs duties to release shipments, and covering upfront costs on a new contract. It is not meant for long-term purchases like real estate or major equipment.

What is the current interest rate for a working capital line of credit?

Bank working capital lines are usually priced as the Prime Rate plus a margin that depends on your credit profile and collateral. Online and unsecured lenders charge more, and some quote a monthly or factor rate instead of an APR. Convert every offer to APR, including fees, before you compare.

Is a working capital line of credit secured?

Bank working capital lines are usually secured by receivables and inventory through a borrowing base, often with a blanket lien. Unsecured working capital lines also exist. Drip Flex Line, for example, requires no collateral, no lien, no UCC filing and no personal guarantee.

How much working capital line of credit can I get?

Lenders size the line from your revenue, profitability and cash cycle. A useful starting point is your working capital gap: the cash tied up in inventory and receivables minus what suppliers let you defer, plus a buffer for your seasonal peak. The sizing calculator in this guide estimates it for you.

What is the difference between a working capital loan and a line of credit?

A working capital loan pays out a lump sum that you repay on a fixed schedule, and you pay interest on the full amount. A working capital line of credit lets you draw repeatedly up to a limit and pay interest only on what you use. A loan suits a one-time need; a line suits recurring, uneven needs.

Is a line of credit included in working capital?

The drawn balance on a working capital line is a current liability, so it reduces net working capital on your balance sheet. The unused portion is not recorded as a liability, but lenders and investors treat it as available liquidity.

Can a small business get a working capital line of credit?

Yes. Banks usually want two or more years in business, solid credit and collateral, while online lenders accept smaller and younger businesses at higher cost. The SBA's CAPLines program also backs working capital lines through partner banks. Drip Flex Line is designed for established US businesses with $2M or more in annual revenue.

Drip Flex Line: An Unsecured Working Capital Line up to $1M

With over $9 billion in trade transactions facilitated and more than 11,000 businesses served globally, Drip Capital helps businesses keep inventory moving and payroll covered without tying up their assets. Questions? Call +1 (650) 437-0150.

Also Read:

• Business Line of Credit: How It Works, Rates & Requirements
• Working Capital Loan for Business: How It Works
• Line of Credit Calculator
• Cash Conversion Cycle
• Working Capital Guide