About the 529 Superfunding Calculator
This 529 superfunding calculator shows how the five-year gift tax election works for a lump-sum contribution to a 529 college savings plan. Federal law lets a donor treat a 529 contribution as if it were spread evenly over five years, so one person can contribute up to five times the annual gift tax exclusion at once — $95,000 per beneficiary at the 2026 exclusion of $19,000, or $190,000 for a married couple who split gifts — without using any lifetime exemption.
It is built for parents and grandparents with a lump sum to invest for a child’s education, and for estate planners moving money out of a taxable estate. Enter the contribution, whether one or two donors are giving, the expected return and years until college to see how much qualifies for the election, how much would be a reportable taxable gift, and how much more the account could grow than if the same money went in as five equal yearly gifts.
Figures use the 2026 annual exclusion of $19,000 per donee (unchanged from 2025, per the IRS gift tax FAQ). The election is made on IRS Form 709 for the year of the contribution, and any other gifts to the same beneficiary during the five years count against the exclusion already used. If a donor dies within the five years, the portion allocated to the years after death is included in their estate.
With the default inputs, the amount covered by the 5-year election is $95,000.00. Change any value above to recalculate instantly.
How to use the 529 superfunding calculator
- 1Enter the lump sum you plan to contribute to one beneficiary’s 529 plan.
- 2Choose one donor, or a married couple who will split gifts.
- 3Check the annual exclusion figure ($19,000 for 2026).
- 4Enter an expected return and years until college.
- 5Review the elected amount, any taxable excess and the growth advantage, then file Form 709 to make the election.
Formula and method
Under the 529 five-year election, a donor can treat a contribution as made ratably over five calendar years. Each donor can therefore cover up to five times the annual exclusion; a married couple who elect gift splitting can cover twice that. The amount used each year is the elected amount ÷ 5 ÷ donors, and anything left of the annual exclusion is room for other gifts to the same beneficiary. Contributions above the maximum are reported as taxable gifts in the year made, which uses lifetime exemption.
The growth comparison compounds the lump sum annually at the expected return for the number of years until college, and compares it with putting the same total in as five equal gifts at the start of years 0–4. Front-loading wins whenever returns are positive because the money is invested longer. Investment returns are not guaranteed and the comparison ignores fees.
- C
- Total contribution
- Exclusion
- Annual gift tax exclusion per donor per beneficiary ($19,000 in 2026)
- r
- Expected annual return
- y
- Years until college
Worked examples
One donor superfunds the maximum $95,000
Five years of the $19,000 exclusion cover $95,000, so the whole gift qualifies with nothing taxable, but it uses the exclusion for five years. At 6% for 15 years, $95,000 grows to about $227,673, versus about $203,317 if paid in as five $19,000 gifts at the start of each year — roughly $24,356 more.
Grandparents give $200,000 together
A couple splitting gifts can elect up to $190,000. The extra $10,000 is a reportable taxable gift that reduces their lifetime exemption. Invested at 6% for 10 years, the $200,000 grows to about $358,170.
Smaller lump sum leaves room for birthday gifts
Electing to spread $50,000 uses $10,000 of the exclusion per year, leaving $9,000 each year for other gifts to the same child. At 5% for 18 years the account could reach about $120,331.
Frequently asked questions
What is 529 superfunding?+
Superfunding is making up to five years of annual-exclusion gifts to a 529 plan at once using the five-year election in the tax code. In 2026 that is up to $95,000 per donor per beneficiary, or $190,000 for a married couple splitting gifts.
How do I make the 5-year gift tax election?+
File IRS Form 709 for the year of the contribution and check the box on Schedule A to elect to treat the 529 contribution as made ratably over five years. Married couples who split gifts each file a Form 709.
What happens if the donor dies within five years?+
The portion of the contribution allocated to years after the year of death is pulled back into the donor’s estate. For example, if the donor dies in year three, the amounts for years four and five are included in the estate.
Can I give more if the annual exclusion goes up?+
Generally yes. The election spreads a fixed amount (one-fifth of the elected contribution) over five years, so if the annual exclusion is later indexed upward, the difference between the new exclusion and the amount already allocated to that year is available for additional tax-free gifts to the same beneficiary.
Do I need the election for a small 529 gift?+
No. The election only applies when a donor’s 529 contributions for one beneficiary exceed the annual exclusion for the year ($19,000 in 2026). A gift at or below that amount is simply covered by the ordinary annual exclusion.
Does superfunding affect financial aid?+
A parent-owned 529 is reported as a parent asset on the FAFSA. Grandparent-owned 529 distributions no longer count as student income on the current FAFSA, which makes grandparent superfunding more aid-friendly than before.
Tax results are estimates based on published rules and simplified assumptions. They are not tax advice — check official guidance or a tax professional for your situation.