Without more information it is difficult to determine what the difference represents. You could have lost some child tax credits if a dependent claimed themselves on their own tax return or was claimed as a dependent on another return. You could have additional self employment taxes accessed from a 1099-MIsc you included in other income. Look at the notice you received. If it has CP2000 in the upper right hand corner, the IRS is only proposing changes at this time but you have a 30 day window to respond to the notice before the additional tax it is assessed.
TurboTax has a audit support site to help you with any IRS notices. Additionally, if you purchased Max Benefits with your 2019 return you would have audit and IRS notice protection from TaxAudit.com. If you purchased Max Benefits, forward the notice to TaxAudit.com and they will work with you to get a solution. Either way TurboTax is here to help you with your IRS Notices.
Click Here to get to the TurboTax Audit Support site to get the ball rolling on answering your IRS notice.
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