Hello Sparhawk,
Getting to the point in your business where you can pay yourself is exciting! I can appreciate the importance of sorting out these kinds of details about how to account for that information, and getting guidance for doing so the first time is a great idea. I want to make sure you're getting the details you need for these calculations and can point you in the right direction for working with your payroll and other financials in QuickBooks.
I'd like to start with addressing QuickBooks Self-Employed since that's the product you're using. QuickBooks Self-Employed is designed for self-employed entrepreneurs to track invoicing, expenses, taxes, and mileage. This version of the software doesn't include a payroll module, so figuring out how and if you should be entering that data into your books is something that I recommend connecting with an accountant for. Another great resource you can consider is the CRA website, which has a lot useful information for business owners and self-employed entrepreneurs about payroll.
Working with the rest of the information you've outlined is also something that I suggest consulting an accountant on. They'll be able to let you know what, if any, of your business financials can count toward your personal taxes. With an accountant's guidance, you'll be able to accurately and confidently remit to the government come tax time.
If you're interested in a version of QuickBooks that does have a payroll module, check out QuickBooks Online. The Online version is built for small business owners who need more features than what QuickBooks Self-Employed offers. It's still a cloud platform and also includes a mobile app for on-the-go work. I've got a few links here that can help with your decision on this.
Wishing you the best with this!
