Hello happyzarp,
Welcome to the QuickBooks Community! QuickBooks Self-Employed is a great option for keeping things simple when it comes to managing your business's books. I can appreciate still needing to know the finer details of your tax calculations and I'm here to help.
Using sales tax in the program is as easy as turning the feature on, selecting the tax codes you need, and then applying them to your transactions. Once you've done that, you'll begin to see the calculations when you visit the Tax summary and Tax details reports through the Reports tab. I encourage you to review the QuickBooks Self-Employed Sales Tax overview article to get you started.
As for ITCs specifically, I recommend reaching out to the QuickBooks Self-Employed team outside of Community to speak with one of our experts who know the ins and outs of the program. They'll be able to let you know if there are extra steps you need to take for ITC calculation. Here's how you can get in touch.
- Click the Assistant tool.
- Type and enter "talk to human."
- Follow the prompts.
To learn where you can find the Assistant feature, check out the Contact QuickBooks Self-Employed Support article.
Have a great day!