I filed with Turbo Tax and paid the Federal taxes I owed. I just received a notice from the IRS for additional taxes due. Can't reach anyone from IRS should I just pay?

[beth-justintaxes]

Need to make payment soon to avoid penalty.  Not able to speak to anyone from IRS or TurboTax regarding why there is additional amount.

[xmasbaby0]

I RECEIVED A LETTER FROM THE IRS/STATE

TurboTax does not receive any information from the IRS or your state after your return was filed, so no one at TurboTax knows about a letter you received from the IRS or the state.

(what the letters from the IRS mean)

I GOT A LETTER FROM THE IRS   

https://ttlc.intuit.com/questions/3605673-i-got-a-letter-or-notice-from-the-irs

I AM BEING AUDITED

If you purchased Audit Defense:

https://ttlc.intuit.com/questions/2924451-i-bought-max-or-audit-defense-and-now-i-m-being-audited

AUDIT SUPPORT

TurboTax has a special phone number for help with IRS/state tax letters, which will be easier than going through regular Customer Support.   At the page below, click on the blue button that says "Get Help from TurboTax Support".  Then it will ask you what tax year is your letter.  Then it will ask you what the letter concerns. Then it will show you the phone number during posted business hours.

https://support.turbotax.intuit.com/irs-notice/audit-support/

[Critter-3]

Read the notice carefully ... are they just billing you for late filing or late payment penalties and/or interest ?   If you did file/pay late then pay up ... there is nothing you can fight.