I do not get the money all alone comment
nor do i understand why you need to group money to maximize compounding interest.
I'm sure I'm butchering my attempt to explain my thinking.
This would be a new IRA, we'd open it solely for this purpose without intent to add to the account. So, we'd have 4K sitting in an IRA, the rest of retirement is in her 401K/my TSP, slightly reducing returns if the money was all in one account.
thats what i do not understand. why does having money in separate accounts reduce returns?
Apparently compound interest only works if the 1 dollar is in 1 account and not in 100 accounts? :D
I think he's more or less having an issue with the fact that the IRA contribution, would be inaccessible were they to career hop. They would not be able to use that money (or it's growth) from the taxable account. Alternatively, I don't think he understands that holding index funds for 'short term' expectations is a gamble of returns, and if OP is planning on having a lack of income in the next 2 years, they should be holding cash not funds... and may need some financial perspective from a case study.
OP, can you and your wife and all expenses survive on her income?
If the answer is yes, evaluate your risk against having an emergency fund in cash or index funds.
If the answer is no, put your emergency fund in cash.
Again if yes, you should both be maxing out any available tax deferred retirement accounts ALL THE TIME, once your emergency fund is set. If you decide to quit, you can either plan ahead a few months and hold some extra cash, or you can jump ship, and survive on your wife's income. Trying to shuffle around which account gets contributions, tax favors, if/when you decide to change careers sounds like a bit of a headache? I'd suggest getting your emergency fund setup, organize your retirement strategy via tax deferred accounts, and then reevaluate as you find the need to look ahead.
Other than that, I don't know what else is wrong with having an IRA open, that either can't get more contributions now, or in a few years. You take advantage of the tax code where it let's you when you can. In 2014, we couldn't defer any income, we had high salaries, and could only contribute to Roths. Those 2014 Roths, still just have 2014 contributions in them. While our traditional accounts et al keep getting stacks and stacks.... Nothing wrong with the Roth accounts just sitting there collecting dust *ahem, interest*.