My father just became eligible (59.9 yrs old) for his monthly retirement distribution from a company he worked quite a few years back. He was notified that if he took his distrubtion now he would recieve about $800 per month. However, even if he waited until 65 his monthly distribution would be the exact same amount.

My question is....if he took the monthly distribution now and invested that money, would the gains be taxable at his current tax rate?

any help would be appreciated. thanks
rob