I have the option to buy back a very short stint in my current pension plan from the early 90s (1/3 of a year). I was making virtually nothing as a library assistant, so the cost is low - $320. It's totally worth doing in the long run; that third of a year will translate to $50-80 a month when I reach retirement age. My question is whether I should do it with a rollover or just pay for it from post-tax funds.
I foolishly cashed my contributions out at the time (which is why I have to buy it back), so I've already paid taxes and penalties. It sort of irk me to pay tax again (by buying with post tax money), but I'd really like to to the most optimal thing.