Hi can you deduct you tax of 20% on a invoice

Hi, @louisewhittingto.

QuickBooks provide different ways to help manage your taxes and reflect how your business is doing. I'm here to further discuss the 20% tax of your invoice. 

We calculate estimated taxes for self-employed users with service-based businesses. We also calculate your federal quarterly payments for you.

To deduct tax of 20% on an invoice, you can enter the amount as negative. You can also create an item to represent the tax of 20%.

If you opt to change sales tax on invoices, there are two ways:

1. From Your work info: Changing sales tax on this page will not impact draft invoices unless you also change the sales tax on those draft invoices directly.
2. From the Invoice itself: Changing sales tax on the invoice will update the existing/current invoice, but not the Your work info set up.

Please refer to this link for the ultimate guide to tax deductions. 

If you have further questions about taxes, don't hesitate to leave a reply below. The Community is always around to assist you. Have a great day!