I withdrew 2018 my RMD on 12/24/2018, filed my return 4/5/2019, but I received a tax penalty on 4/29/2019 for "Failure-to-pay proper estimated tax" for 2018. I had no other income for 2018 other than a monthly pension of $24.93 (total of $299.16, which I added to the RMD). Am I supposed to pay tax on income I haven't received yet (the RMD)? The billing summary (attached) shows tax I owed equaled exactly my "payments and credits" to the penny. But added $223.61 for "failure to pay proper estimated tax penalty." Never explained why there was a penalty.
Did your 2017 tax return have a balance due? If so, then you were supposed to pay in estimated taxes throughout the year up to the liability on the 2017 taxes to avoid the estimated tax penalty on the balance due on the 2018 tax return.
If this is your situation, you may be able to reduce/eliminate that penalty using Form 2210 Annualized Income method, since you're not getting the money until the end of the year.....IRS only sees that you owed money in 2017 and again in 2018, they don't know when during the year you received the income that created the tax liability.
the problem is that the IRS assumes the retirement income is received evenly throughout the year. so they use the simplified method to compute penalties. do as Lisa995 suggests prepare the AI section of 2210 and send it in with notice. respond asap and use tracking service. the IRS usual position is that if you don't respond timely, then you agree with them