(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/
The IRS is stating that you have a balance due on your tax return that was filed. Did you fail to report income or enter income incorrectly on the tax return? The IRS notice should tell you exactly what the IRS added, changed or deleted from the filed return to arrive at the balance owed.
See this IRS website for a CP501 notice - https://www.irs.gov/individuals/understanding-your-cp501-notice
Use the TurboTax Audit Support Center to assist you with understanding the notice you received from the IRS - https://support.turbotax.intuit.com/irs-notice/audit-support/
The TurboTax 100% Accurate Calculation Guarantee is for any calculation errors caused by the TurboTax program. It does not cover any user errors or errors of omission. TurboTax will reimburse you for any penalties and interest owed and paid for by the user of the software based on a program calculation error.
See this TurboTax support FAQ - https://ttlc.intuit.com/community/charges-and-fees/help/what-is-the-turbotax-100-accurate-calculation-guarantee/01/26355