Working Capital: Formula, Ratio & Hard-Asset Income Investor Guide

Working capital is one of those metrics that appears straightforward on paper but hides meaningful complexity in practice — especially in the cyclical sectors I invest in. It measures a company's short-term liquidity: can the business pay what it owes in the next 12 months using the assets it will convert to cash in the same period?

For shipping, mining, and upstream energy companies, working capital analysis requires adjustments and context that generic finance textbooks don't cover. A product tanker company with negative working capital is not necessarily in trouble. A miner with a high current ratio might still face a dividend cut. Here's how I think about it.

Working Capital Formula

Current assets include: cash and cash equivalents, short-term investments, trade receivables, inventory, and prepaid expenses.

Current liabilities include: accounts payable, accrued expenses, short-term debt, current portion of long-term debt, dividends payable, and other obligations due within 12 months.

Current Ratio Benchmarks by Sector

Why Negative Working Capital Isn't Always a Red Flag in Shipping

Tanker and bulk carrier companies frequently operate with negative working capital — and it's often by design, not distress. Here's why:

1. Revolving credit facilities: Most listed shipping companies maintain committed revolving credit lines that supplement their cash position. These don't appear as current assets but act as a liquidity buffer.
2. Current portion of long-term debt: If a company has $200m in current liabilities, $150m of that might be the current portion of a term loan being refinanced on schedule. This is a presentation item, not a liquidity crisis.
3. High operating cash flow: At TCE rates of $30,000+/day per vessel, a fleet of 50 ships generates $500m+ in annual operating cash flow. The company doesn't need a large working capital cushion when cash arrives quickly and predictably.
4. Variable dividend policy: Companies like TORM, Frontline, and DHT calibrate their variable dividends to cash flow, not working capital. When rates drop, dividends drop — the balance sheet absorbs the change.

Working Capital in Mining: Inventory as a Double-Edged Sword

Mining companies carry substantial inventory — ore stockpiles, work-in-progress concentrate, refined metals awaiting shipment. During a commodity price downturn, this inventory can rapidly lose value, distorting the current ratio:

• A copper miner with $400m of copper concentrate inventory looks liquid at $2/lb copper. At $1.50/lb, that inventory is worth $300m — a $100m swing in working capital with no operational change.
• Coal miners serving seaborne thermal markets have receivables in USD but operating costs partly in local currency (AUD, ZAR, CLP). A currency shift can squeeze working capital on both sides.
• Precious metals companies — particularly royalty and streaming firms — often have minimal inventory and carry excess cash. Franco-Nevada, Wheaton Precious Metals, and Royal Gold consistently maintain current ratios above 3× for this reason.

Net Working Capital vs. Operating Working Capital

Operating working capital excludes cash, short-term investments, and financial debt — isolating the pure operational liquidity cycle. For capital-light businesses, the two measures converge. For commodity producers with large inventory positions, the gap is meaningful.

Working Capital and Dividend Safety

Working capital directly intersects with dividend safety analysis in cyclical companies. I check three things:

1. Minimum cash floor: Does management have a stated minimum cash balance (e.g. "we maintain at least $100m in unrestricted cash")? Companies like FLEX LNG explicitly state this. It defines the real liquidity floor.
2. Dividend payable timing: Large declared dividends appear in current liabilities before they're paid. Don't mistake a big dividend payable for a liquidity crisis — it's just the lag between declaration and payment.
3. Seasonal working capital swings: Australian coal producers (Whitehaven, Thungela's SA operations) see receivables spike during Asian wet season when buying accelerates. Working capital looks worst just before the cash arrives. Normalise for seasonality before drawing conclusions.

Days Working Capital and Cash Conversion Cycle

For shipping companies, DSO is typically very short (5–15 days for spot fixtures, 30 days for time charters). For mining companies, DIO can be 30–90 days depending on the processing cycle. This is one reason why miners generally need higher working capital buffers than tanker operators.

Working Capital Requirements: Capital Expenditure Context

Working capital doesn't exist in isolation. A company's total liquidity requirement is:

This is the correct way to think about whether a dividend is sustainable in a soft market. I apply this framework when evaluating any high-yield hard-asset company. See Dividend Coverage Ratio and Net Debt for the complementary metrics.

Related Concepts

Liquidity Balance Sheet Current Ratio Cash Flow Dividend Safety

See also: Free Cash Flow · Net Debt · EBITDA · Dividend Safety · Capex

Marco Bozem

Independent Investor & Analyst | Hard Assets, Dividends, Shipping | MB Capital Strategies

Marco has been analysing commodity and dividend stocks for years, focusing on shipping, mining, and energy. All analysis is based on publicly available reports and personal assessment. Not investment advice.