To get a W-3 form in QuickBooks Online, you need to have QuickBooks Online Payroll set up and active. The W-3 form summarizes all employee wages and tax information reported on your W-2 forms for the year. To access it, sign in to QuickBooks Online, go to the Payroll tab, select Filings, and then choose Annual Forms. From there, find and open the W-3 form for the appropriate tax year.