Wise Ags of the B/I board, tell me your thoughts on my latest predicament..
Baby #2 will enter this world in the coming few months and I started thinking about setting up my 2nd 529 plan for child #2. However, I remembered that one fund could be used for multiple kids and began wondering about just doubling my monthly contributions to my 1st 529 plan rather than making a second separate payments to 2 separate accounts. I decided to run some calculators to see what they came up with.
Each month I pay $425 into child #1's 529 plan. So far child #1 (2.5 years old) has over $15k in their account. If I continued to do $425 for the next 16 years, #1 would have $142,000 for college. I am using 4% interest even though it has been between 6-8% return if memory serves me correct.

Once #2 enters this world and I do the same $425 for 18 years (plus a few gift contributions from grandparents-not included in this calculation), #2 would have $134,000. If I guessed what grandparent's contribution looked like over 18 years, it would get #2's savings around that $140,000 range like #1. Nothing surprising.

Then my final calculation for $850 ($425x2) for 18 years at 4% interest shows $299,000. About $20,000 more than if I had the two separated

Now-my questions is, should I combine them or not? What if #1 wants to go to school out of state and has higher tuition and leaves less $ for #2's in state tuition? Also, to further complicate things, there is a good chance we will have a 3rd child, so if I combine all 3 tuition savings in one account, that could be challenging or fair to track what kid should get what $. I want to keep it as fair and transparent as possible, so keeping them separate would be the EASIEST.