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Good cash flow management in a Canadian small business starts with one habit: know what’s coming in and going out for the next 13 weeks, and keep money that isn’t yours in a separate place. On a $20,000 invoice in Ontario, $2,600 is HST you collect for the CRA. If you spend it on stock, you’re borrowing from the government without knowing it.
Why does a profitable business run out of cash?
Because profit is an accounting word and cash is a bank balance. You can sell $50,000 in a month and still miss payroll if your customers pay in 45 days and your supplier wants money in 15. It happens to good businesses all the time, usually in the month after a big win, when the new order needs stock and staff paid up front while the customer’s money is still weeks away.
So the first practice is a simple weekly sheet. List the cash you expect in each week and the cash that has to leave. Update it every Friday with what really happened. Thirteen weeks is far enough to see a squeeze coming and close enough to be accurate.
Here’s what the first four weeks of that sheet might look like for a small shop that starts with $8,000 in the bank. The numbers are made up.
| Week | Cash in | Cash out | Balance at end |
|---|---|---|---|
| 1 | $6,000 | $7,000 | $7,000 |
| 2 | $3,000 | $4,500 | $5,500 |
| 3 | $9,000 | $5,000 | $9,500 |
| 4 | $2,000 | $8,000 | $3,500 |
Week 4 is where payroll and the HST remittance land together, and the balance drops from $9,500 to $3,500 in seven days. Nobody wants to find that out on the Thursday it happens.
How do you get paid faster?
Send the invoice the day the work is done, not at month end. Put the due date and how to pay on it. Offer an easy way to pay, like an e-transfer or a link, because a cheque in the mail adds days.
Then follow up. A polite message a few days before the due date and another a few days after works better than silence. For a new client, ask for a deposit. It costs you an awkward minute and often saves a bad debt.
Do you have to give terms at all? No. Net 30 is a habit, not a rule. Shorter terms for smaller customers are fine, and you can say so on the quote.
Which payments should you plan for?
The ones that come as a lump. Sales tax is the big one, and payroll comes second. Income tax instalments, if you owe more than the threshold, are third.
| Payment | What the CRA rule says |
|---|---|
| GST/HST return, monthly or quarterly filer | Due 1 month after the end of the reporting period |
| GST/HST return, annual filer | Due 3 months after the fiscal year end |
| GST/HST, sole proprietor with a December year end | Payment by 30 April, return by 15 June |
| Payroll, quarterly remitter | Average monthly withholding under $3,000 and a clean record |
| Payroll, regular remitter | Average monthly withholding under $25,000 |
| Payroll, accelerated remitter, threshold 1 | Average monthly withholding from $25,000 to $99,999.99 |
The CRA assigns your GST/HST reporting period from your revenue and lets you ask for a more frequent one. Check which one you have in your business account, because we couldn’t confirm the revenue bands on the page we read. The dates above are for the 2025 tax year, and 2026 due dates for the annual filers aren’t published yet.
What does a payroll remittance really cost?
More than the pay stub says. For one employee in Ontario paid $3,000 every two weeks, the payroll remittance calculator shows $732.62 held back from the employee, plus $228.41 that you add as the employer share. That’s $961.03 to send in each pay period, and the full cost of that pay period comes to $3,228.41.
The trap is timing. You collect from customers late and remit early. If the account is thin, a remittance is what bounces first, and interest and penalties follow. Keep that cash in a separate account, and move it the day you pay wages.
Instalments work the same way. If you expect to owe $9,000 of net tax for the year, the tax instalments calculator shows four payments of $2,250 on 15 March, 15 June, 15 September and 15 December. Nothing is due if your net tax owing is under $3,000.
When does borrowing make sense?
For a short gap you can see the end of. A line of credit is built for that, and a term loan for something that pays back over years. Take $20,000 owing at 9%. The line of credit calculator shows $150 of interest a month. Pay $500 a month and it takes four years and costs $3,868 in interest. Pay $900 and it’s done in 25 months for $1,961.
The rate floats with prime, so the real numbers will move. We didn’t look at any lender’s rates and can’t say what you’d be offered. Ask for the rate, the fees and what happens if you go over the limit, and compare two offers before you sign.
A cash cushion beats a line of credit every time. Aim for a few weeks of fixed costs in a separate account, and build it a little each month, even when it’s tight.
How big a cushion is enough?
There’s no official number, and we haven’t found a reliable one. A common starting point is enough to cover a month of fixed costs, then you grow it toward two or three. Look at your own worst month in the last year and size the cushion to get you through it. If that sounds like a lot, think of it as the paycheque you never have to miss.
What mistakes cost the most?
Spending the HST, first of all, because it sits in your account looking like revenue until the return is due, and then it leaves. Mixing personal and business money, which makes every number harder to read. Chasing new sales when the real problem is a late invoice you haven’t followed up. And not knowing your own margin. If your margin is thin, faster sales won’t fix your cash. The profit margin calculator takes ten seconds and often changes what you decide.
The GST/HST calculator shows the tax part of any invoice, so you can put it aside on the day you’re paid.
Sources, and how we checked them
Due dates and remitter thresholds come from the Canada Revenue Agency‘s GST/HST filing and payroll remitting pages, read in September 2026. The dollar examples come from this site’s calculators. The instalment threshold and dates are those built into the instalments tool. We aren’t a government service and we don’t speak for one.
Frequently asked questions
What is the fastest way to improve cash flow?
Invoice the day the work is done and follow up on late payers. Both cost nothing and show up in the bank within weeks.
Is HST money mine?
No. The HST you collect is held for the CRA until you file. On a $20,000 invoice in Ontario, $2,600 is tax.
How far ahead should I plan cash?
Thirteen weeks is a practical window. Update it weekly with what actually happened.
When are payroll remittances due?
It depends on your remitter type, which the CRA sets from your average monthly withholding. Check your account for the exact dates.
Is a line of credit a good fix for cash gaps?
For a short gap with a clear end, yes. Rates float with prime, so check the rate and fees with the lender.
- Self-employed taxes in Canada: income, CPP and GST
How tax works when you are self-employed in Canada: reporting income and expenses, paying both halves of CPP, instalments and when to register for GST