Long time (10 year) lurker - I think this is my 3rd post or so. Have learned a ton from this place over the years, and will continue to read and learn 
A bit about us - DW and I have been fortunate to both have solid professional careers, and to both have naturally good control of expenses. My 401k is more than maxed (salary growth has caused it to now drive a few $k of post-tax savings each year), her 403(b) is saving a healthy % (without match), and at least for now we're not eligible for Roth's. The rest of our savings goes to a taxable account (international and domestic index funds), or occasionally against our 4.875% mortgage. We're comfortable with the nest egg we've built so far (~$500k) and except to continue to save.
With our first little one on the way, I'm starting to rethink what to do with our extra savings for the next couple of years. The deduction for NY ($10k max for couples I think) is making the 529 plan pretty attractive. I'm thinking about maxing that out for 2-3 years right away, reducing our taxable savings by that amount. The NY fund allows Vanguard index investments with a 0.25% expense ratio, which while not the best available, doesn't seem that bad given the deduction for state taxes.
Anything I'm missing, or should really consider before doing this? While there are restrictions on how the 529 funds can be used, the state tax deduction seems worthwhile enough to warrant at least a few years worth of contributions early, while they have the max time to grow. We can always switch back to the taxable account after getting a strong and early start to the college savings.
Any thoughts?
A bit about us - DW and I have been fortunate to both have solid professional careers, and to both have naturally good control of expenses. My 401k is more than maxed (salary growth has caused it to now drive a few $k of post-tax savings each year), her 403(b) is saving a healthy % (without match), and at least for now we're not eligible for Roth's. The rest of our savings goes to a taxable account (international and domestic index funds), or occasionally against our 4.875% mortgage. We're comfortable with the nest egg we've built so far (~$500k) and except to continue to save.
With our first little one on the way, I'm starting to rethink what to do with our extra savings for the next couple of years. The deduction for NY ($10k max for couples I think) is making the 529 plan pretty attractive. I'm thinking about maxing that out for 2-3 years right away, reducing our taxable savings by that amount. The NY fund allows Vanguard index investments with a 0.25% expense ratio, which while not the best available, doesn't seem that bad given the deduction for state taxes.
Anything I'm missing, or should really consider before doing this? While there are restrictions on how the 529 funds can be used, the state tax deduction seems worthwhile enough to warrant at least a few years worth of contributions early, while they have the max time to grow. We can always switch back to the taxable account after getting a strong and early start to the college savings.
Any thoughts?