Hi there, @lakshmi4.
Payroll wage and tax calculations in QuickBooks are derived from the payroll data and transactions you entered. For QuickBooks to properly calculate correct wages and tax amounts, your employees and payroll items should be set up correctly.
Since you want to create adjustments to your Federal taxes, I'd recommend reaching out to your accountant. This way, they can provide you with options to increase your taxes.
As your reference, please check out the following articles:
Should you have any follow-up questions or concerns, don't hesitate to post again here in the Community or leave a comment on this thread. Take care and have a good one.