Cash Flow

Cash flow is the net movement of cash into and out of the business over a defined period, categorized into operating, investing, and financing activities. Operating cash flow comes from running the business (customer payments minus operating expenses), investing cash flow tracks long-term asset purchases or sales, and financing cash flow captures debt and equity raised or repaid. Cash flow (not revenue or accounting profit) is the metric that actually determines whether a startup survives, because companies fail when they run out of cash regardless of what their P&L shows. It is the most operationally critical metric at most startups and the one founders most often misunderstand.

The three categories of cash flow:

Operating cash flow (from running the business):

• Cash in: customer payments received (not invoiced; received).
• Cash out: salaries, vendor payments, rent, marketing spend, etc.
• Working capital changes: changes in accounts receivable, inventory, accounts payable.
• Net operating cash flow: cash generated (or burned) by core operations.

Investing cash flow (long-term asset changes):

• Cash out: capital expenditures (equipment, software, real estate), acquisitions, investments in other companies.
• Cash in: asset sales, divestitures.
• Usually negative for growth-stage companies investing in infrastructure.

Financing cash flow (raising and returning capital):

• Cash in: equity raised, debt taken on.
• Cash out: debt principal repaid, dividends paid (rare at startups), share buybacks (rare at startups).
• Usually positive at startups during financing rounds; sometimes negative during debt repayments.

The relationship between revenue, profit, and cash flow:

Revenue vs cash flow:

• Revenue is recorded when earned (invoice sent or service delivered); cash flow happens when payment is received.
• B2B SaaS often has 30-90 day payment terms, so cash arrives later than revenue.
• Subscription business models often collect annual contracts upfront, so cash arrives before revenue is recognized (creating deferred revenue).

Profit vs cash flow:

• Profit (net income) includes non-cash items: depreciation, amortization, stock-based compensation, accounts receivable changes.
• A profitable company can have negative cash flow (growing receivables, large capex, paying down debt).
• An unprofitable company can have positive cash flow (subscription business collecting upfront cash).

Why cash flow matters more than P&L at startups:

• Bankruptcy is about cash: companies fail when they can't pay bills, not when they show a loss.
• Runway depends on cash flow: monthly burn rate = monthly operating cash flow. Runway = cash balance / monthly burn.
• Operating decisions affect cash: every hire, every contract, every spend decision moves cash. Decisions get tested against cash impact.
• Investor metrics: investors evaluate cash burn and runway, not P&L profitability, at most early-stage companies.

The cash flow statement components:

• Beginning cash balance.
• Plus: operating cash flow (net of cash in and out from operations).
• Plus: investing cash flow (typically negative for growing companies).
• Plus: financing cash flow (positive during fundraising; otherwise minimal).
• Equals: ending cash balance.

Cash management disciplines:

• Monthly cash flow forecasting: model cash position monthly going forward; updated regularly.
• Working capital management: faster collections (shorter payment terms, deposits, autopay); slower payments (use full vendor payment terms).
• Cash reserves: maintain minimum cash threshold below which decisions tighten.
• Burn rate monitoring: track actual burn vs planned burn monthly.

What founders get wrong: Focusing on revenue and P&L metrics without sufficient attention to actual cash position and cash flow timing. The right discipline: implement monthly cash flow forecasting projecting 6-12 months forward, monitor actual vs forecast weekly, evaluate every significant operating decision for cash impact, and maintain explicit minimum cash thresholds that trigger spending reviews. Cash is the operating constraint that matters most; everything else follows from managing it well.

Related: Burn Rate · Runway · P and L Statement · Financial Model · Balance Sheet

FAQ

What is cash flow?
The net movement of cash into and out of the business over a defined period. Categorized into operating cash flow (from running the business), investing cash flow (asset purchases or sales), and financing cash flow (capital raises, debt repayments). Cash flow (not revenue or profit) determines whether a startup survives.

How is cash flow different from revenue and profit?
Revenue is recorded when earned (invoice sent); cash flow happens when payment is received. Profit (net income) includes non-cash items like depreciation; cash flow tracks actual cash movement. A profitable company can have negative cash flow; an unprofitable company can have positive cash flow (subscription model collecting upfront).

Why does cash flow matter more than P&L at startups?
Because bankruptcy is about cash, not paper losses. Companies fail when they can't pay bills, not when they show a loss. Runway = cash balance / monthly burn rate. Investor evaluation focuses on burn and runway, not P&L profitability, at most early-stage companies. Cash is the operating constraint that matters most.