529 Savings Calculator

The price of starting, priced three ways

Aim at a $120,000 four-year target at a 6% return. Start at birth and the monthly contribution is $310: over 18 years you deposit about $66,916 and growth supplies the remaining $53,084, nearly half the degree paid for by compounding. Start at age 8 and the same target needs $732 a month, of which growth now covers only about $32,130. Start at 13 and it is $1,720 a month, with growth reduced to a rounding error of about $16,804. Nothing about the target changed; only the runway did. This is the entire sales pitch for starting a 529 in the first year, and unlike most sales pitches it is just the compound interest formula telling the truth.

Why a 529, and the two honest cautions

The account's tax structure is the reason for its existence: contributions grow tax-deferred and withdrawals for qualified education expenses (tuition, fees, room and board at least half-time, books, and up to $10,000 a year of K-12 tuition and of student loan repayment) are tax-free, a treatment no brokerage account matches. Many states add a deduction or credit for contributions to their own plan, worth checking before defaulting to another state's higher-rated plan; the deduction is real money this year against a possibly better fund lineup elsewhere. Caution one: money earmarked for a child who does not attend, or who wins the scholarships you did not forecast, is not trapped, but it is inconvenienced; since 2024, up to $35,000 of long-held 529 money can roll to the beneficiary's Roth IRA, and the beneficiary can be changed to another family member, which together retire most of the old overfunding fear. Caution two: a grandparent-owned 529 no longer counts against aid under the current FAFSA, a rule change that quietly made grandparents the most efficient funders in the system.

How much target is enough

Funding the full sticker of a private degree is a choice, not an obligation, and it competes with your own retirement for the same dollars; the standard ordering (retirement first, because loans exist for college and not for retirement) survives scrutiny. A defensible target for most households is the four-year net cost of the in-state public option, computed above, on the reasoning that it keeps every public door open, makes the private door a stretch rather than a fantasy, and leaves the student some priced skin in the decision. Revisit the target when the net price estimates for real schools arrive in junior year; a 529 is a reservoir, not a contract.

Investment glide paths: why the return assumption steps down

The calculator takes a single return figure for simplicity, but real 529 portfolios do not hold one risk level for 18 years. Age-based portfolios, the default option in most state plans, start heavily in equities when the child is young and shift toward bonds and capital preservation as enrollment approaches, because a market crash at age 7 is recoverable and the same crash at age 17 is a changed college list. The practical consequence for your inputs: a blended expectation around 5 to 6% suits an age-based portfolio across the full horizon; families holding a static equity portfolio can justify more on paper and must also accept the sequence risk the glide path exists to remove. Run this calculator at your optimistic and pessimistic returns and fund to the middle of the two monthly figures; the plan that survives is the one whose contribution you will actually still be making in year twelve.

Who should own the account

A parent-owned 529 is assessed gently on the FAFSA (as a parent asset, up to 5.64% of its value counted per year) and its qualified distributions are not income to anyone. A grandparent-owned account is, under the current FAFSA, not reported at all, which makes grandparents the system's most efficient funders, with one coordination caveat: multiple family accounts aimed at one child should agree on a combined target, or the reservoir overshoots into the overfunding inconveniences described above, solvable but tedious. Student-owned (custodial) 529s carry the worst aid treatment of the three and are usually legacy artifacts of UTMA conversions; the aid office's professional judgment process can sometimes help. State tax deductions, where they exist, follow the contributor and their state of residence, which is one more reason the funding conversation should happen at the family level once, with everyone's numbers on the table, rather than account by account in isolation.

Front-loading and the five-year gift election

Relatives with lump sums should know the 529's one piece of tax theater: a special election lets a contributor front-load five years of annual gift-tax exclusions into a single year's contribution, up to five times the annual exclusion per donor per beneficiary, without touching the lifetime estate exemption, provided the election is filed and no further gifts are made to that beneficiary in the window. For a grandparent pair, that is a six-figure sum moved into the account in one motion, where it compounds tax-free for education from day one. The strategy interacts with the aid treatment described above (grandparent accounts are currently invisible to the FAFSA) and with the Roth rollover escape hatch if the child out-saves the need. It deserves professional advice at that scale, but it should at least be a known option before smaller monthly plans are set in motion by default.