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Hi there, Ma05152.
QuickBooks Online will not let you enter prior paychecks without any taxes. You will need to manually calculate the deductions before recording them in your account.
You might want to look for websites that offer payroll tax calculations such as https://www.paycheckcity.com/ to help you get the amounts.
You can also visit these articles that talks about recording prior payrolls in QuickBooks Online:
The Community is always here if you need more help with payroll. Thanks for dropping by.