Operating cash flow calculator

How operating cash flow is calculated

OCF = Net income + D&A − ΔAccounts receivable − ΔInventory + ΔAccounts payable

FCF = OCF − Capital expenditures

This is the indirect method — the standard format used in GAAP financial statements. It starts with net income (an accrual figure) and adjusts for items that affect income but not cash (D&A add-back) and items that affect cash but not income (working capital changes).

Working capital sign conventions:

• AR increase → subtract. When customers owe you more money than before, you've recognized revenue but haven't collected it — cash is tied up in receivables.
• Inventory increase → subtract. Buying more inventory consumes cash even though it doesn't hit the income statement as an expense yet.
• AP increase → add. When you owe more to suppliers than before, you've taken their goods but haven't paid — cash is temporarily retained.

Omitting the working capital fields gives a simplified OCF (net income + D&A only), which is appropriate when working capital is roughly stable year to year.

OCF margin benchmarks

How lenders use OCF and FCF

OCF vs EBITDA: Many lenders start with EBITDA because it is simple to extract from an income statement. But EBITDA overstates cash generation for businesses with growing receivables or rising inventory — a business booking $1M in revenue but collecting only $700,000 of it has the same EBITDA as one that collected $1M, but very different cash positions. Lenders doing thorough underwriting adjust EBITDA for working capital changes to arrive at a cash flow figure closer to OCF.

FCF and debt service: Free cash flow — OCF minus capital expenditures — is the closest income-statement-derived figure to the cash actually available for debt principal and interest. A business with $150,000 in OCF but $120,000 in required annual capex to maintain operations has only $30,000 in FCF to cover debt service. Lenders and SBA underwriters look at this in the context of the debt service coverage ratio.

SBA loan context: The SBA requires lenders to calculate global cash flow — combining personal and business income — to confirm the borrower can service proposed debt. The business component of that calculation is typically based on net income plus D&A plus interest, adjusted for one-time items. This is essentially a simplified OCF calculation.

Worked examples

Example 1 — HVAC services company (healthy cash flow):

This company has $104,000 in FCF to cover debt service. At a 1.25× DSCR requirement, FCF supports up to $83,200/year ($6,933/month) in new loan payments. Note that EBITDA for this same business is $200,000 — significantly higher than OCF, because working capital changes are consuming $11,000 net and capex is another $25,000. Using EBITDA alone would overstate available cash.

Example 2 — fast-growing retailer with negative working capital impact:

Despite profitable operations ($120k net income), this retailer is cash flow negative because rapid growth is consuming working capital faster than the business generates profits. This is a classic "profitable but cash-poor" scenario — exactly why a lender requests a cash flow statement, not just an income statement. The business needs a working capital line of credit or receivables financing to bridge the gap.

Assumptions and limitations

• Working capital fields are period-over-period changes. Enter the difference between end-of-year and start-of-year balances — not the ending balance itself. If AR was $180,000 at year-end and $150,000 at year-start, enter $30,000 (the increase).
• This calculator uses the indirect method. The direct method (listing each cash receipt and payment) produces the same OCF figure but requires transaction-level data most business owners don't have readily available. The indirect method, using income statement figures plus working capital changes, is the standard for tax-return-based underwriting.
• OCF excludes financing cash flows. Loan drawdowns, principal repayments, and equity contributions appear in the financing section of the cash flow statement — not in OCF. OCF measures only cash generated by business operations.
• One-time items are not adjusted here. A cash flow statement may include non-recurring items (insurance proceeds, lawsuit settlements, asset sales). For lender presentations, work with your accountant to adjust OCF for items that won't recur, producing a "normalized" figure.

Frequently asked questions

What is the difference between OCF and EBITDA?

EBITDA adds back D&A to net income but ignores working capital changes — it assumes cash collection matches revenue recognition perfectly. OCF accounts for the actual timing of cash receipts and payments. A business with growing receivables will have OCF lower than EBITDA; one with shrinking receivables (collecting old invoices) may have OCF higher than EBITDA. For stable businesses, the two figures are close. For high-growth or seasonal businesses, the gap can be significant.

What is free cash flow and why do lenders care about it?

Free cash flow is operating cash flow minus capital expenditures. It represents cash the business generates after maintaining and investing in its asset base — the cash available to repay debt, pay dividends, or reinvest. A business with high OCF but very high capex requirements (like a trucking company that must continually replace vehicles) has much less free cash than its OCF suggests. Lenders assessing loan repayment capacity want to know FCF, not just OCF.

Can a profitable business have negative operating cash flow?

Yes — and it is a common surprise for small business owners. If a business grows quickly, receivables and inventory tend to increase faster than profits, consuming cash. If customers slow their payments, receivables build up even without revenue growth. A business can show excellent net income while simultaneously running out of cash. This is why cash flow analysis is a separate discipline from profitability analysis.

Should I include owner salary in net income for this calculation?

Use the net income figure directly from your tax return or financial statement — do not adjust it for owner compensation. If you want to normalize for an above- or below-market owner salary, that adjustment belongs in a separate business valuation or SDE calculation, not in the OCF calculation itself. Lenders verify against tax returns, which reflect actual (not normalized) net income.