Retirement tax questions

That would make the earliest withdrawal date for the earnings to be tax free January 1, 2018. Your age is honestly immaterial to that. I would have advised you to leave the earnings portion in there and withdraw it after the first of this year to avoid taxes, but no worry. It's a tiny amount. Your math is correct - $112.66 of your distribution is taxable. The 10% penalty generally does not apply to post-death distributions. I wouldn't worry about that.