How do I deduct 20% cis from my invoices to a main contractor that I’m working for? I have tried searching online but I don’t have those setting options in the app?

Hello there, jreedman.

Let's turn on the CIS feature on your contractor's settings. Once you turn on this feature, a new item will be created for use to all customer/vendor associated to CIS. If you're using a Mobile App, I recommend logging in to a browser when following the steps below:

1. Go to the Sales menu, then the Customers tab.
2. Select a customer and click the Edit button.
3. Check the box for Is CIS contractor.
4. Click Save.

When you use the CIS labour 20% to charge customer, it will automatically reduce 20% to the total invoice.

Learn more about managing CIS in QuickBooks through this article: CIS in QuickBooks.

If there'll be anything else you need or questions about QuickBooks, let me know. I'm always up to help.