Hi there Shamps,
Thanks for reaching out about your tax filings. Quickbooks Online is a great tool able to help keep track of tax on sales and expenses so you know the amount owed on each filing. I can provide some information about marking taxes as filed in QuickBooks Online.
In QuickBooks Online, there isn't the option to edit the dates on a filed return, so it would need to be deleted by your accountant and then recreated. Only accountants using QuickBooks Online Accountant users can unfile a sales tax return, so I would recommend reaching out to your accountant for this task. You can invite your accountant to your QuickBooks Online account by clicking on the My Accountant tab. There's also an option to find an accountant near you in that section by clicking on the Find a Pro to help button.
One thing to note when opening back up a filing to recreate it would be that if there are any exceptions on the tax filing, they will be lost. I recommend using the steps in the first reply in the thread to view the exceptions relating to the existing filing so you know if there are any to consider when filing once more.
If you have any other questions, feel free to reach out here.
