2008 Home buyer credit

[Jstoudamire_22]

In 2008 I took advantage of the 2008 home buyer credit and received the full $7,500.  I have filed my taxes using turbo tax since receiving this credit and have been paying it back since turbo tax said I needed to.  2020 I sold the home and turbo tax said I still owed $2500 which I paid with my taxes but the irs sent me a letter saying I still owe an additional $500.  Did TurboTax calculate wrong or did the irs?   I can’t find my old filings online that would verify I started paying this back and don’t owe any more. 

[Critter-3]

repayment started on the 2010 return so you paid $500 for 10 years =5000  

so you owed $2500 on the 2020 return.

[Opus 17]

You would have to know your past payment history.  Possibly you can get an account transcript from the IRS if you did not save copies of your tax return.  
https://www.irs.gov/individuals/get-transcript

You can also look up your FTHB account here.  
https://www.irs.gov/credits-deductions/individuals/first-time-homebuyer-credit-account-look-up

In general, repayments of the 2008 credit would have started on the 2010 tax return, so after filing the 2019 return you would have paid 10 x $500, and owed just $2500.  The IRS may have failed to credit one of your payments, but you will have to do some research to prove it.