Working Capital Explained: What It Is and Why It Matters

Working capital is the money available for day-to-day operations.

What Working Capital Actually Measures

The formula is simple: current assets minus current liabilities, where "current" means convertible within twelve months.

Current assets include cash, accounts receivable, inventory and prepayments. Current liabilities include accounts payable, short-term debt, accrued wages, and the current portion of long-term debt.

If a business has $180,000 in current assets and $110,000 in current liabilities, working capital is $70,000. That sounds adequate, and it may not be. Look at the composition. If $120,000 of the assets is slow-moving inventory and $40,000 is receivables from a customer who pays in 90 days, the $70,000 of "working capital" is not available to pay wages next week.

This is why the current ratio and the quick ratio matter alongside the headline number. The current ratio is current assets divided by current liabilities; above 2.0 is generally comfortable, below 1.0 signals difficulty. The quick ratio strips out inventory and prepayments, showing only the genuinely liquid position. A business with a 2.0 current ratio and a 0.7 quick ratio is holding too much slow stock.

Our working capital calculator computes the balance and both ratios from your figures.

Why Working Capital Needs Change

Working capital is not a static number to be set and forgotten. It moves with the business.

Growth increases the requirement. A business growing 30% needs more inventory and carries more receivables, both of which consume cash before the corresponding revenue arrives. This is why fast-growing businesses fail in their best years.

Seasonality creates peaks and troughs. A retailer building stock for December needs far more working capital in September than in February. A landscape contractor needs it in spring. The requirement is a cycle, not a level.

Payment terms shift it. Moving a major customer from Net 30 to Net 60 increases your requirement by 30 days of that customer's revenue, immediately. A single contract change can consume a quarter's profit.

Supplier terms shift it back. Extending payables from Net 30 to Net 45 releases 15 days of purchases. This is the cheapest working capital available, because it costs nothing.

The implication is that you should calculate your working capital requirement quarterly, not once at the end of the year when the number is already stale.

The Options for Funding a Working Capital Gap

Once you know the size and duration of the gap, matching the funding to it is straightforward.

Business line of credit. The right tool for a recurring or seasonal gap. Interest is charged only on what is drawn, and the facility can be repaid and redrawn. The main risk is renewal: lenders can reduce or withdraw a facility at annual review, often when your need is greatest.

Invoice financing or factoring. Converts receivables into immediate cash. Appropriate when the gap is caused by slow-paying customers rather than by the business itself. Factoring is faster and simpler; invoice financing is cheaper and keeps the customer relationship with you.

Supplier term negotiation. Free, and almost always the first thing to try. Many suppliers will extend terms if asked, especially for reliable customers.

Short-term loans. Suitable only for a gap that will genuinely close within the loan term. Using a term loan for a permanent working capital requirement means you will need to refinance at the end of the term, at whatever rate and terms are then available.

Working capital from profit. The healthiest source, and the slowest. Building one to two months of operating expenses in reserve removes most of the stress from working capital management.

Worked Example: A Distributor's Seasonal Squeeze

A garden equipment distributor has $2.4 million annual revenue, with 60% of it concentrated in March to July. It buys stock January to March and is paid April to August.

Baseline balance sheet in the quiet season shows current assets of $420,000 — $60,000 cash, $180,000 receivables, $170,000 inventory, $10,000 prepayments — and current liabilities of $210,000. Working capital is $210,000 and the current ratio is 2.0. Comfortable.

In February, the picture changes completely. Inventory rises to $640,000 to build the seasonal stock. Payables rise to $520,000 because suppliers are being paid for that stock. Cash falls to $15,000. Current assets are $905,000 and current liabilities $730,000. Working capital is still $175,000 and the current ratio is 1.24 — but cash is $15,000 and payroll of $95,000 is due in nine days.

The balance sheet still looks reasonable. The business is nine days from being unable to pay staff.

The fix is a seasonal line of credit sized to the peak requirement, not the average. Calculating the trough: peak payables of $520,000 plus the $95,000 payroll plus $60,000 of other operating costs, minus receivables and cash available, gives a peak requirement of roughly $430,000. A $500,000 facility drawn in January and repaid by August costs about $18,000 in interest at 11% for the six months it is drawn.

The alternative — discovering the gap in February and applying then — takes four to six weeks and would have been too late. The facility must be arranged in the autumn, before the season, when the balance sheet is at its strongest and the lender's view of the business is most favourable.

Funding Working Capital: Which Tool for Which Gap

Risks and Points of Caution

• Judging working capital by the balance alone. A healthy ratio can coexist with an empty bank account if the assets are slow inventory and old receivables.
• Funding a permanent need with short-term debt. You will refinance at the worst moment. Match term to duration.
• Relying on an overdraft or facility being renewed. Lenders can withdraw facilities at review. Do not build a business that collapses if a facility is pulled.
• Letting one customer dominate receivables. A single customer representing most of your receivables is a concentration risk that also blocks invoice financing, since lenders limit exposure to any one debtor.
• Ignoring the seasonal peak. Sizing a facility to average requirements rather than peak requirements leaves you short precisely when you need it.

Managing Your Working Capital

1. Calculate current assets, current liabilities, the current ratio and the quick ratio. Use the working capital calculator.
2. Chart the requirement across twelve months, not just at year end, to find your seasonal peak.
3. Identify concentrated receivables or inventory that distort the picture.
4. Ask your two largest suppliers to extend terms before considering borrowing.
5. Arrange any facility in your strong season, sized to the peak, not the average.
6. Move invoicing to same-day and add deposit requirements to new orders.
7. Build toward one to two months of operating expenses in reserve.
8. Review the requirement quarterly, and immediately after any major contract change.