What a cash-flow forecast tells you
A cash-flow forecast lays out, month by month, the money coming in and the money going out, and ends each month with the balance left in the bank. That ending balance is the whole point. If it dips below zero in month seven, you have a problem in month seven, and now you can see it coming while there is still time to act. Uneven, unpredictable cash flow is the single challenge small business owners report most often (Federal Reserve Small Business Credit Survey, 2024).
Profit and cash are not the same thing
You can be profitable on paper and still miss payroll. Profit counts a sale the day you make it. Cash counts the money the day it actually lands. Send a $9,000 invoice on net-60 terms and you have earned $9,000 of profit and received zero dollars to spend. The gap between those two is where healthy-looking businesses quietly run dry. A forecast tracks the cash, not the profit, because the bank only honors cash.
Build the forecast in five lines
Start with your opening balance. Then add cash in, by source, dated to when the money truly arrives, not when you invoice. Then subtract cash out in three groups: fixed costs (rent, software, insurance), variable costs that move with sales, and what you pay yourself. Last, subtract tax set-aside, because the tax bill is real money you do not get to keep. Run those five lines across twelve months and the running balance draws your future for you.
US and Canada: tax timing is where forecasts split
The shape of a forecast is the same across the border; the tax timing inside it is not. In the United States, sole proprietors and many owners pay federal estimated tax in four installments across the year (mid-April, mid-June, mid-September, and the following mid-January), so a US forecast sets aside tax every month and releases it on those dates. In Canada, the rhythm is different: you remit GST/HST on a schedule set by your revenue (annual, quarterly, or monthly), and the CRA requires income-tax installments once your net tax owing crosses its threshold. A forecast built on the wrong country's calendar will tell you that you are fine in a month you are not. (Current as of 2026-06-15. Verify the current dates and thresholds with the IRS and the CRA before you file.)
The one signal you are looking for
You are not building a forecast to admire a spreadsheet. You are building it to surface one sentence: "you run low in March." That sentence is worth more than any report, because it converts a vague worry into a dated deadline you can plan against, raise a line of credit against, or cut costs against. Everything else in the forecast exists to produce that warning early enough to matter.
Forecast your cash flow
This is the cash-flow step of your small business planner. Try the cash-flow forecaster free to see your verdict and the weeks ahead; keep the full twelve-month forecast, the best and worst scenarios, and export with the Operator's Kit. The forecaster runs the math in your own country's terms, so you do not have to be an accountant to know whether you are okay.