Small Business Cash Flow Forecast Calculator

Forecast small business cash flow by estimating starting cash, expected income, expenses, loan payments, taxes, and ending cash balance.

Input Details

Cash Positions

Starting cash balance

The amount of cash available at the beginning of the month.

Monthly Cash In

Expected monthly revenue

The total revenue you expect to collect this month.

Other monthly income

Include grants, refunds, owner contributions, interest, or other income.

Monthly Cash Out

Fixed monthly expenses

Rent, salaries, software, insurance, subscriptions, and other recurring expenses.

Variable monthly expenses

Materials, contractor costs, shipping, commissions, ad spend, or other expenses that change month to month.

Loan or debt payments

Monthly loan payments, credit line payments, or other financing costs.

Taxes & Draws

Estimated tax set-aside percentage

Percentage of profit you want to set aside for taxes.

Planned owner draw

Amount the owner plans to take out of the business this month.

Results

Ending Cash Balance

$12,200

Your projected liquid cash reserves at the end of the monthly period.

Net Cash Flow+$2,200

Cash Flow Margin14.7%

What this means

Your forecast shows positive monthly cash flow, meaning the business may bring in more cash than it spends this month.

Detailed Breakdown

Starting cash balance$10,000

Total cash in (revenues + other)+$15,000

Operating expenses (fixed + variable)-$9,000

Loan & debt payments-$750

Estimated tax set-aside (20%)-$1,050

Planned owner draw-$2,000

What is a Small Business Cash Flow Forecast Calculator?

A Small Business Cash Flow Forecast Calculator is an interactive financial tool designed to help entrepreneurs, startups, and established businesses project their cash balances. By entering starting cash, expected monthly revenues, overhead expenses, taxes, debt commitments, and owner draws, you can preview the timing of your cash balances to ensure you maintain sufficient working capital to operate your business.

Why cash flow forecasting matters

Cash flow is the lifeblood of any small business. A company can be highly profitable on paper (accrual accounting) but still experience a cash crunch due to late invoices, high inventory costs, or unexpected upfront expenses. Regular cash flow forecasting enables business owners to:

Identify Cash Shortages Early: Predict exactly when you might run low on funds so you can secure a line of credit or delay capital expenditures.
Plan Large Expenses: Determine the best month to purchase equipment, hire new staff, or pay off debt.
Make Smarter Owner Decisions: Calculate safe owner draw amounts without risking payroll or essential vendor payments.

What should be included in a cash flow forecast?

To get a complete, accurate estimate of your cash positions, your forecast must trace:

Starting Cash Balance: All liquid money (cash, checking accounts) available on day one.
Total Cash In: Expected collections from client invoices, instant retail sales, grants, refunds, or equity injections.
Operating Expenses (OpEx): Both fixed costs (rent, payroll, server subscriptions) and variable costs (materials, commissions, ad campaigns).
Debt & Tax Commitments: Loan payments, credit card balances, and tax set-aside savings.
Owner Draw: The cash taken out of the company specifically to pay the owners.

Cash flow forecast formula

The ending cash balance is calculated using standard cash flow tracking metrics:

Ending Cash Balance = Starting Cash + Cash In - Expenses - Debt Payments - Taxes - Owner Draw

Disclaimer

This calculator provides estimates only. Actual cash flow depends heavily on client payment terms, invoice aging (receivables collection timing), inventory purchasing cycles, unexpected bills, and overall economic conditions.

Frequently Asked Questions

It is a forecasting tool designed to help business owners estimate the movement of cash in and out of their business over a month, predicting their ending cash reserves.

Profitable businesses can still go out of business if they run out of cash. Forecasting helps you predict cash shortages before they occur, allowing you to secure funding or adjust expenses.

Profit is revenue minus expenses on paper, whereas cash flow tracks when cash actually enters and leaves your bank account. For example, paying off a loan principal or owner draws affect cash flow but are not business operating expenses.