Cash Flow Calculator 2026
Project monthly cash flow and ending cash balance for any business or freelance operation. Includes runway calculation if you are burning cash.
Last updated April 2026 · Sources: SCORE small business cash flow benchmarks, SBA financial planning resources, AICPA cash flow standards
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Cash flow projection
Common cash flow categories
Most small businesses underestimate outflows because they forget the irregular and quarterly items. Use this checklist when projecting cash flow.
- • Customer payments received (not invoiced)
- • Loan proceeds
- • Owner investment
- • Asset sales
- • Tax refunds
- • Interest income
- • Rent and utilities
- • Payroll and contractor payments
- • Supplier and inventory purchases
- • Loan payments (principal + interest)
- • Insurance premiums
- • Quarterly estimated taxes
- • Software subscriptions
- • Marketing and advertising
- • Professional fees (legal, accounting)
- • Equipment and capital expenses
Frequently Asked Questions
What is cash flow and why does it matter?
Cash flow is the actual money moving in and out of your business each month, not the same as profit on paper. A profitable business can still go bankrupt if cash flow turns negative — for example, if customers pay slowly while suppliers demand fast payment. The phrase "cash is king" exists because businesses run out of cash before they run out of customers, profits, or assets. Most small business failures are technically cash flow failures, not profitability failures.
What is the difference between cash flow and profit?
Profit is calculated on an accrual basis: you record revenue when you make the sale and expenses when you incur them, regardless of when cash actually moves. Cash flow tracks only the actual movement of money. A business that sells $50,000 worth of services in a month but does not get paid for 60 days will report $50,000 in revenue but $0 in cash inflows. Profit can look great on paper while you cannot make payroll because the cash has not arrived yet.
How do I calculate operating cash flow?
The simplest formula is: Operating Cash Flow = Cash inflows from operations − Cash outflows for operations. Cash inflows include customer payments received, not invoices sent. Cash outflows include rent, payroll, supplier payments, utilities, insurance — all the cash actually paid out. The official accounting formula adjusts net income for depreciation, amortization, and changes in working capital, but the practical version is just tracking your bank statement.
What is runway and how is it calculated?
Runway is the number of months your business can survive at current cash burn before running out of money. Runway = Current cash / Monthly net burn rate. If you have $50,000 in the bank and you are losing $5,000 per month, you have 10 months of runway. Startups obsess over runway because it determines how long they have to either become profitable or raise more money. Profitable businesses have infinite runway as long as they remain profitable.
What is a healthy cash flow margin?
Cash flow margin (operating cash flow / revenue) varies by industry but 10-15% is generally healthy for small businesses. SaaS companies often hit 20-30%. Restaurants and grocery stores might see only 5-8% because of their thin margins. Whatever your industry, the trend matters more than the absolute number — declining cash flow margin over multiple quarters is a serious warning sign even if the absolute number still looks fine.
Why is my profit positive but cash flow negative?
Almost always due to timing. Common causes: customers taking 60-90 days to pay invoices (accounts receivable), inventory buildup before a busy season, prepayments to suppliers, capital expenditures on equipment, principal repayments on loans (only the interest portion shows on the income statement). All of these consume cash without affecting profit. Track aging receivables weekly if your business invoices customers — old receivables are the silent killer of cash flow.
How can I improve cash flow without increasing sales?
Speed up customer payments: invoice immediately rather than at month-end, offer small discounts for early payment, accept credit cards even at 3% fee cost, follow up aggressively on overdue invoices. Slow down outflows: negotiate longer payment terms with suppliers (30 to 60 days), pay bills on the due date rather than early. Reduce inventory levels. Defer non-essential capital expenditures. Refinance debt to lower monthly payments.
What is a 13-week cash flow forecast?
A standard tool used by CFOs and turnaround consultants. You project weekly cash inflows and outflows for the next 13 weeks (one quarter) at a granular level — every customer payment expected, every payroll run, every loan payment. It shows you exactly which weeks will be tight and lets you plan around them. Most businesses do not need this level of detail, but if cash is tight, the 13-week forecast is the single most valuable financial tool you can build.
How much cash should a small business keep on hand?
The standard recommendation is 3-6 months of operating expenses in reserve. Highly seasonal or volatile businesses should target 6-12 months. Stable businesses with predictable revenue can run with 1-3 months. Less than one month is risky — a single bad month or unexpected expense can force tough decisions. Keep this reserve in a high-yield savings account earning 4-5% rather than checking, but make sure it is immediately accessible.
What is free cash flow versus operating cash flow?
Operating cash flow is cash generated from running the business. Free cash flow subtracts capital expenditures (money spent on equipment, property, software, and other long-term assets). Free cash flow = Operating cash flow − Capex. Free cash flow is what is actually available to pay down debt, distribute to owners, or reinvest in growth. Investors and acquirers often value businesses based on free cash flow because it represents the true cash-generating power of the enterprise.
How do loans affect cash flow?
When you receive a loan, the principal is a cash inflow. Each monthly payment is a cash outflow with two components: interest (which is an expense on the income statement) and principal repayment (which is NOT an expense but still uses cash). This is why a profitable business can be cash-strapped if loan payments are large — the principal portion eats cash without showing up on the income statement. Always look at total debt service when planning cash flow, not just interest expense.
Should I prioritize cash flow or profitability?
Both, but cash flow comes first. A profitable business with negative cash flow goes bankrupt. A cash-flow-positive business with thin profits can keep operating indefinitely while you work on profitability. The ideal is positive cash flow AND positive profit, but if forced to choose in the short term, choose cash flow. In the long term, persistent negative profitability will eventually catch up with cash flow because reality always wins.
Sources: SCORE small business cash flow benchmarks, SBA financial planning guides, AICPA Statement of Cash Flows standards (ASC 230), Federal Reserve Small Business Credit Survey 2025.
Disclaimer: Estimates only. Cash flow projections are inherently uncertain. Real-world results depend on collection rates, seasonality, and unexpected events.