Tax rate of 13.5%...

Doesn't sound like that much of a 'mess'  to me.

And I don't understand your comment, at all.

That's kinda like going down to the morgue, pulling a guy out of the cooler and then calling a doctor to see if the doctor can help.  At this point, all he can do is pay the tax.

I say mess because the client did not understand the consequences of his actions. He has already paid over $13,000 in taxes, and tax avoidance is an objective of mine, regardless of the tax rate. I am not jealous of high income individuals like this person, just trying to do my best for him. 

Normally there's nothing to do after the fact but Congress was handing out DeLoreans this year to eligible individuals.  If the retirement stuff was COVID related they can spread it over 3 years or pay it back.

Brazil

No one, except you, said anything about jealousy. 

Your OP said $ 21000 'total' tax.  What one has already paid in (or not) isn't relative to the overall rate.

Your inference that I don't also do what I can to minimized my clients tax rate is unnecessary.

Thanks for clarifying what you meant by "mess".   Clients that don't seek advice in advance don't get much of my sympathy.  Nor do ones in such a low bracket.  

Iron Man, you hit the coffin nail on the head...

I carry my ACME hammer wherever I go. 🔨

"and IRA dist"

Give it Back.

What do you mean by "SS classification" ?  Even with zero pension and IRA income, 85% of his Social Security would be taxable.  Are you trying to do retirement planning for him, not just tax planning?  Sure, he might have been able to wait to start collecting Social Security.  And he might have been hit by a truck tomorrow.  Or he might live in Texas and froze to death after contracting Covid.  When my clients ask me when they should start collecting Social Security, I first ask them for their date of death.