I paid my 2018 taxes a bit late. I guessed at the interest, and paid the whole thing with IRS2GO.
I guess I forgot to put in bank details for a refund, because today I got at check for $1.67. Since I am out of the country it would cost me more than that to cash or deposit it.
My wife suggests saving it for next year's taxes, including it with the return, and deducting it from the tax due. :-)