Planning & decision tool
529 superfunding calculator
Superfunding lets you front-load several years of tax-free gifts into a 529 in one shot, and this shows the largest amount you and a spouse can put in for each child without touching your lifetime gift exemption. It also illustrates the head start that front-loading buys over contributing year by year, using a return assumption you can change.
Background reading: Estate & legacy
Electing to front-load uses up that contributor's annual exclusion to that beneficiary for the whole spread period. Additional gifts to the same beneficiary during those years can exceed the exclusion and require gift-tax reporting.
If a contributor dies within the spread period, the unspread portion of the front-loaded gift is pulled back into their taxable estate. This screen does not compute that add-back; it is a conversation for a CFP.
- Growth figures are hypothetical and illustrative, not a guarantee of any future result. They show the head start front-loading buys by investing sooner, not a balance you will reach.
- Single constant real return, today's dollars via a real return (no explicit inflation model), end-of-year contribution timing; ignores sequence-of-returns risk, state 529 tax benefits and credits, and plan fees.
- Changing the return or horizon moves the figures, which is the point: the result is a function of the assumptions you set.
Whether to superfund, and how much, depends on your cash flow, estate plan, your state's 529 tax treatment, and the basis and gifting tradeoffs involved. That judgment belongs with a CFP.
Assumptions and simplifications
- Capacity is the maximum that stays inside the annual exclusion under the spread election, using no lifetime exemption; it assumes no other gifts to the same beneficiary during the spread period.
- A married couple reaches double a single contributor by both spouses electing, not via a separate gift-split toggle.
- Capacity reflects the annual exclusion and front-loading period in the parameter layer for the tax year, both of which can change; state-level 529 rules are not modeled.
- Two nuances are routed to a CFP rather than computed: additional gifts to the same beneficiary inside the period (possible overage) and a death within the period (estate add-back).