Hi, Juan.
Read the IRS letter again...carefully.
From what you wrote, it seems they didn't need proof of payment; they already knew that you had paid the $300 estimated taxes. They just wondered why you did not claim that prepayment on your final 1040.
Sounds to me like they know they owe you some money and are trying to refund it to you.
Read their letter again. And please let us know how this turns out.
RC
-- -- R. C. White, CPA San Marcos, TX (Retired. No longer licensed to practice public accounting.) snipped-for-privacy@grandecom.net Microsoft Windows MVP (2002-2010) (Using Quicken Deluxe 2013 R 12 and Windows Live Mail in Win8 x64)
About a month or more ago, I got a letter from the IRS asking if I had forgotten to include the fact that I had paid $300 in estimated taxes that I had not declared when I filed (and paid what I thought I owed).
I got the proof of payment and sent it to them.
Any idea how long it will take them to process a refund?