TL;DR

A cash flow forecast is your financial weather forecast — it tells you when money is coming in and going out so you can plan ahead. Knowing a cash shortfall is coming in 6 weeks lets you act now; discovering it when it hits is too late.

Key Points

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A cash flow forecast projects expected cash in (from invoices and expected payments) and cash out (expenses, taxes, loan payments) week by week or month by month

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13-week (quarterly) rolling forecasts are the most practical timeframe for most small businesses

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The forecast reveals cash gaps — periods where outflows exceed inflows — before they become crises

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Update the forecast regularly (weekly or bi-weekly) as new invoices are sent and payments are received

Building a Cash Flow Forecast

Start with your current cash balance. Then list all expected cash inflows for the forecast period: which invoices are outstanding and when are they likely to be paid (based on your payment terms and each client's payment history); any new invoices you expect to send and when; and any other income sources¹. Then list all expected cash outflows: fixed costs (subscriptions, rent, insurance premiums), variable costs (contractors, software, marketing), tax payments (quarterly estimated taxes), and loan or debt service. Subtract outflows from inflows for each period and carry the running balance forward. Any period where the running balance would go negative is a projected cash gap that needs to be addressed.

Identifying and Responding to Cash Gaps

When your forecast reveals a future cash gap, you have several options: accelerate collections on existing invoices (send reminders earlier, offer a discount for early payment); request an advance from a long-term client; use Invoice Financing to convert outstanding invoices to immediate cash; delay non-critical expenses to a better-funded period; or draw on a business line of credit. The earlier you see a gap, the more options you have. A gap discovered 6 weeks out can be solved with accelerated collections or one additional client project. A gap discovered with 3 days to spare can only be solved with emergency financing — expensive and stressful.

Making Forecasting a Regular Practice

A cash flow forecast is only useful if it's kept current. Set a regular cadence — once a week or bi-weekly — to update your forecast. Enter actual payments received, update expected payment dates for outstanding invoices based on new information, and add any new outflows. Over time, comparing your forecasts to actuals improves the accuracy of your estimates (you'll learn which clients consistently pay 15 days later than their terms, for example). Many small business accounting tools include a cash flow forecast feature. A simple spreadsheet with 13 columns (one per week) is also perfectly adequate for a solo freelancer or small team managing Working Capital actively.

References

FreshBooks — Cash Flow Forecast ↗

freshbooks.com

FreshBooks — Cash Flow Analysis ↗

freshbooks.com

Last updated: June 9, 2026

Related Terms

Cash Flow

The net movement of money into and out of a business over a specific period, reflecting the actual cash received from clients and paid to vendors, suppliers, and operating expenses.

Working Capital

The difference between a business's current assets (cash, receivables, inventory) and current liabilities (accounts payable, short-term debt) — a measure of short-term financial health and operational liquidity.

Days Sales Outstanding

A metric measuring the average number of days it takes a business to collect payment after issuing an invoice, used to assess the efficiency of accounts receivable management.

Liquidity

The ease and speed with which assets can be converted to cash to meet financial obligations, and more broadly, a measure of a business's ability to cover its short-term liabilities.

Estimated Tax

Advance tax payments made by self-employed individuals throughout the year to cover federal (and often state) income taxes and self-employment taxes, in the absence of employer withholding.

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