How to change date on invoice that has already been sent out

Hi there, 

QuickBooks Online is the go-to program for business owners that are looking to manage their invoices with ease. It's vital you're able to edit your invoice so you can continue to do the things you enjoy. I'll be happy to share more info and make sure you're on the right track with achieving your goals. 

You can edit the date on the invoice by clicking on Sales > Invoices > locate and open the invoice in question > from here you can edit your invoice accordingly so it reflects the correct tax amounts. Once you're done, make sure to save your changes. You can also delete the invoice using the same steps. I also recommend consulting with your accounting specialist for expert advice so your books can remain accurate. 

Let me know if you have additional questions by leaving a comment below, I've got your back,