Who do you have to pay before you know how much you owe? The CRA of course.

If you are a sole proprietor your tax payment deadline is at the end of April– but your tax filing is not due until June.  Also, if you owe more than $6000 in a year you need to start paying installments for the next year based on an estimate of what you will owe for next years taxes. https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/important-dates-individuals/filing-dates-tax-return.html

If you are a corporation your tax payment deadline is in 3 months. Filing deadline is 6 months from fiscal year end. So if you have a September year end the payment deadline is December and the filing deadline is March. https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/corporations/corporation-income-tax-return/when-file-your-corporation-income-tax-return.html

So you can either estimate your taxes and pay them, get them done early and know how much you owe or wait until you file and then pay penalties and interest.  

2017 Tax changes
3d people – man, people push up word “tax”

Note: interest at the CRA is around 5% so you might be better off keeping your money and paying the interest if you can get more than 5% benefit from it.

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