We got a IRS notice CP23 for tax year 2018 saying we owe but when i did our taxes on turbotax it says we owed less than that

Did you have estimated payments suggest for 2018 by the 2017 program and then did not make those payments ?  If so when you completed the 2018 return those payments were brought forward and you were supposed to review them for accuracy and if needed make corrections.   So if you did not make all the payments listed and you did not correct it prior to filing then the IRS caught the error.

@Dental714 

Who made a mistake?  If you made a user error and did not enter income or entered something incorrectly. the accuracy guarantee does not help with that.

 

https://turbotax.intuit.com/corp/guarantees/

 

(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/