I received a letter saying that I have to pay 16,226.85 due to the income reported on my 2022 form 1040 do not match. How can I check this information? What can I do?

[Bsch4477]

Read the letter from the IRS carefully and follow the directions given. 

[mesquitebean]

Do you have a copy of your 2022 return to review, or do you need to know how to find your 2022 return?  If prepared in Online TurboTax, we can tell you how to find it and download a PDF.

If you purchased Audit Defense, those folks can help with an IRS letter.   If you did not, then TurboTax also has a free Audit Support Center that can help you with an IRS letter.   The special phone number is way down in the FAQ at the bottom of the table

FAQ:  TurboTax Audit Support Center

https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-audit/turbotax-audit-support/L6AcMoN...

[mesquitebean]

ADDENDUM:   

Also, be sure the letter is legitimate.  Although not as common as email scam, there have been some scams where fake letters were sent.    If you phone the IRS to verify the letter, use their general phone number, not the one in the letter in case it's a scam.

IRS: 800-829-1040 (7AM-7 PM local time) Monday-Friday

Also see this FAQ, which explains the various types of IRS letters:

FAQ:  I got a letter or notice from the IRS

https://ttlc.intuit.com/turbotax-support/en-us/help-article/internal-revenue-service/got-letter-noti...

[mesquitebean]

Something else to consider if there's not another explanation:

If the IRS thinks you have "unreported income", and you didn't, it could signal ID theft where someone could have been working illegally using your SSN, and thus their income could have been reported as yours.   

In any case, if the letter doesn't fully explain the IRS's issue with your return, then you're likely going to have to talk to the IRS to see exactly what all is going on and what income they are referring to, or make an in-person appointment with them if there is an IRS office in your city.    But first talk to TurboTax free Audit Support Center  (or Audit Defense--if you purchased that product) as I mentioned in my first post above so they can question you about the issue, and see how they suggest you proceed.