Are 529 contributions based on the calendar year, or can they be made prior to April 15th?

[LisaBr · Accepted solution]

Most states have a December 31st deadline for 529 contributions. 

However, there are a few states, such as Georgia, that use April 17, 2018 as the contribution deadline.

I've attached a link with the deadlines for all state 529 plans.  Remember, you do not need to use your home state's 529 plan.  https://www.savingforcollege.com/articles/529-plan-contribution-deadlines-for-state-tax-benefits-877