They do not allow you to double up, they allow you to chose between the two. The best would be to withdraw directly from your traditional IRA for tuition and pay for living expenses through the 529.
Are you sure about this? I assumed that to be true, but what I quoted above seems to imply otherwise.
I agree it's always better to use 529 funds for living expenses first, but if madamwitty has more money in the 529s than what will cover living expenses, then she will need an exit strategy for that money.
Just to be clear - you are talking about student living expenses? I include both student living expenses and tuition as "education expenses" and expect to have enough 529 funds to cover both.
But I am planning far enough ahead I have flexibility in how much I put into the 529 vs. taxable investments (which could be spent down prior to FAFSA years.) So the [rhetorical] question is, how much should I save in the 529? (That's a topic which could take up a whole thread of its own). The benefit drawing tuition expenses from a 529 (as opposed to IRA) is that it does not count as income for the EFC calculation (IRA does.) There may be no 10% penalty on the IRA withdrawal but there's a EFC bump of 22%+ of the withdrawal amount for the following year. (The downside of the 529 is that it's assessed as an asset at 5.64%) I suspect it makes sense to pay tuition out of 529 funds for the first few years and out of IRA withdrawals the last few years. But there is also the uncertainty and possibility of over-saving in a 529, and needing to pay a 10% penalty to get the money out (as noted in the OP it might make sense to use this for family/parent living expenses in lieu of a similar IRA withdrawal which would also incur 10% penalty).
One related question: Assuming you get an EFC and the college offers an aid package covering the rest with grants/work study, how does the amount you pay (EFC) get apportioned between student living expenses and tuition? As a parent, do you have any control over this?
Unless a scholarship can't be used for anything but tuition, aid is just applied to the bill, and you pay the remainder. There generally is no apportioning between different expenses. It really is only an issue for your taxes, and you have the choice of how you wish to divide it up. Scholarships and grants are not taxable if they are used for tuition, but are if used for living expenses. If you wish to claim the AOG, you must pay some tuition with non-scholarship money (cash, loans, etc.), up to $4k to get the full credit. Any excess scholarship money (not used for tuition) must be claimed as taxable income.
It is a delicate balancing act each year figuring out how much of which type of aid to allocate to which type of bills, to maximize the college credits and minimize the taxable scholarship income. State credits don't exactly align with federal credits, either. Some include books, some exclude, etc. It is also confusing due to the 1098t you receive from the college reporting scholarships, grants and bills. Colleges can report either amounts billed or paid (which might get paid later) in a calendar year. The amounts can be incorrect, and are just informational, but if you do your taxes with SW like TurboTax, it will prompt you to input the amounts and treat it like fact, and assume you want to assign all scholarships to tuition (minimize taxable scholarships income), making you ineligible for the AOG. You have to know how you want to override amounts to get the best result between the parent's taxes AND the student's taxes.
Some schools send better 1098Ts than others - DS2's college included a detailed breakdown of all bills and credits, DD1's and DD3's colleges only have totals and we had trouble recreating the parts from the online to-the-student-only billing system. No paper bills are issued, only online balances, that can change (a credit is applied, then reversed, then altered) - it is maddening. Some schools do all billing in the second half of the year, that is, in August for fall semester, in early December for spring semester. This is actually a good thing - it gets a full year of expenses in a calendar year, and all years in 4 rather than 5 tax years (since the AOG can only be claimed 4 times). Otherwise you end up unable to claim expenses for the final spring semester if you pay after January 1.
The AOG is partially refundable. It can be up to $2500 credit, but only up to $1k is refundable. I believe you can use $1500 as a credit and take the $1k refund, if you owe $1500 tax. I also believe that if you claim <$4k in tuition and your credit is reduced, the refundable portion is prorated (40%).
The interesting things I found out while looking for rules about the 529 withdrawals: you can (and one site insisted, should) withdraw the amount of scholarships to get those funds out of the 529 w/o penalty (though I think gains are taxable income). There is a similar penalty loophole if you claim the AOG - you would not be eligible for the credit using 529 funds, but it seems you can withdraw the amount used to qualify for the credit penalty free but gains taxable. If you have loans to use for educational expenses, also withdraw funds up to that amount, again to get the funds out. You are mentally spending the 529 funds on college expenses, and the loans on other stuff.
Generally, I believe the first aid given is loans, then maybe work study, then grants and scholarships, with federal and state grants before the institution's grants and scholarships. No real proof, just the hierarchy I sense. Federal grants like PELL and state grants like TAP in NY depend on your EFC - subtract your EFC from the max grant amount for each, if negative then zero. IOW, a zero EFC gets you approx max PELL and TAP, EFC $3k gets partial, EFC $6k gets zero. School scholarships and grants can be merit and or need based, and can have stipulations. DD3 has a $2500 academic "in residence" scholarship that requires she live on campus. She has done the math and will be giving this scholarship up to live just off campus - the savings over paying R&B is greater than the scholarship, including rent over the summer to work in the college town.
Some colleges gap, some gaps are huge. Despite having EFC = 0, DD1's first choice college gapped her 50% of our family income! She petitioned, but they just pushed more loans, then suggested she might be happier elsewhere. She was very happy with her second choice, and we were even more so, since it was much closer to home. DS2's experience went the opposite - his first choice aid package was good, but second choice package was better. He called FA at first choice and said he really wanted to attend there, but aid was important, could they match other school's package? They asked to see the offer, and they beat it!