IRS finds an error in my 2020 tax return

[gbandyop]

Turbotax filled my 2020 tax return online. After almost one year, (after I received my refunds), IRS sent me a letter saying that  my return has under payed taxes. I need to pay $1715 more. IRS cited that some numbers in my return are under reported.  I think Turbotax should double check my 2020 Tax return and negotiate with IRS to make a correction. Otherwise I do not know what to do.

[DoninGA]

Contact the TurboTax Audit Support Center and speak with an agent who can help you understand the notice you received from the IRS - https://support.turbotax.intuit.com/irs-notice/audit-support/

[VolvoGirl]

They should say what was underreported.  Did they get a 1099R you left off  or you reported the wrong taxable amount?  Or some other income you left off?  If they increased your income that would also make more of any Social Security taxable.

Did you get a 1099NEC or 1099Misc and report it as other income instead on Schedule C for self employment?  

You need to ask the IRS what is wrong.