The IRS sent a letter stating I didn't pay when I did.

[DoninGA]

If you have proof of payment for the federal taxes owed, either a bank or credit card statement showing the payment, then contact the IRS using the procedure in the IRS letter you received.

[VolvoGirl]

That you didn't pay the tax due or they adjusted your return and sent you a bill for more?

How did you pay it?  Your only proof of payment is your bank or credit card statement showing it coming out.  Turbo Tax does not pay it.  They only send your bank info to the IRS or state for them to pull it out of your account.

[Mike9241]

the letter explains how to respond and where to send it. all you need is to include the documents that prove you paid it. canceled check and bank statement. credit card statement whatever. you need to submit proof. the IRS will not take your word for it.