Hi I'm new to quickbooks and dont know how do I put a 20% deduction on my invoice because the company I work for stop my tax?

You'll have to manually calculate the tax and add it to the invoice, Lindsaycundy6.

I'll show you how:

1. Go to Invoices.
2. Click Create invoice.
3. Add the customer.
4. Click Add product or service, then add the item/service and tax.
5. Enter the amounts.
6. Click Email.

You can check the reference on how to create an invoice in QuickBooks Self-Employed for more information.

If there's anything else that we can do for you, please feel free to let us know.