I Want to Help Pay for My Grandkids' College. Should I Make a Large Lump-Sum 529 Plan Contribution or Spread Funds out Evenly Through the Years?

A young granddaughter gets a piggy back ride from her grandfather in the park. They are both smiling and looking left of the camera.

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Question: I want to help pay for my grandkids' college. Should I make a large lump-sum 529 plan contribution or spread the funds out evenly over the years?

Answer: A lot of people experience sticker shock when they sit down to look at college costs today. For the 2025-2026 academic year, U.S. News & World Report puts the average cost of tuition and fees at a four-year, public in-state school at $11,371.

For a public out-of-state school, the average price tag is $25,415, and for private universities, it's $44,961.

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Meanwhile, an estimated 42.5 million people today owe federal student loan debt, according to the Education Data Initiative, which also says the average public university student borrows $31,960 to get a bachelor’s degree.

Owing all that money can take a toll. A late 2023 Bankrate survey found that 59% of student loan borrowers felt forced to delay key financial milestones because of their student debt, including building emergency and retirement savings.

If you’re in a strong enough financial position to help pay for your grandchildren’s education, you might be eager to ease that burden — both for them and your grown children who might also be struggling to set aside money for college savings.

If so, a 592 plan is a good place to start. These plans offer the benefit of tax-free gains and withdrawals, provided the money is used to cover qualifying educational expenses.

You might wonder if it’s better to make a large lump-sum contribution to a 529 plan now or spread those funds out evenly over the years. You could go either way. It’s important to understand the pros and cons of both options.

The case for megafunding a 529 up front

A grandmother and her baby granddaughter are looking at eachother and laughing.

If you can afford to fund a 529 plan with a lot of money up front, it could pay to do so, says Jonathan Sparling, director at CollegeWell.

As he explains, “Contributions to 529 plans are excluded from an individual's taxable estate, even though the account owner retains control of those funds.”

Moreover, Sparling says, “529 plans are eligible for the super-funding provision, which allows individuals to front-load five years of contributions in one tax year. A married couple could contribute as much as $190,000 per beneficiary, thereby reducing their taxable estate by that amount of money.”

There’s also the benefit of time to consider from an investing standpoint.

“Contributions made to 529 investment plans when a child is very young have more time to accumulate growth and weather market fluctuations. The same is true for 529 prepaid plans, like ones provided by certain states and the Private College 529 Plan,” he says.

With the Private College 529 Plan, Sparling explains, contributions lock in a percentage of tuition and fees at nearly 300 member colleges across the country.

“Making a lump-sum contribution earlier on locks in more years of tuition at a lower rate, protecting against future tuition inflation,” he says.

The case for funding a 529 plan through the years

Young girl checking her height on the wall, demonstrating her growth in height over time.

If you can afford to front-load 529 plan contributions, not only does it give your money that much more time to grow, it’s also an expense you won’t have to think about year after year.

However, Brian Schmehil, CFP and managing director of Wealth Management at The Mather Group, points out that while you’re generally better off investing a lump sum of money, this approach increases your market-timing risk compared with dollar-cost averaging year after year.

Schmehil also points out that it’s important to consider the tax benefits your state might offer.

“Many states limit the amount you can deduct from your income each year,” says. “Spreading out your contributions can provide a guaranteed tax benefit to you and your family. In some cases, the value of this guaranteed tax benefit may outweigh the uncertainty of market returns.”

Schmehil also says that making contributions on a yearly basis gives you more flexibility if your circumstances, or those of your beneficiaries, change.

For example, you might end up in a situation in which your health care costs increase dramatically later in retirement. One of your grandchildren might decide that once they reach middle school, they’re interested in a specific trade and don’t wish to attend college.

Even though 529 plans give you some flexibility to switch beneficiaries, ultimately, you’ll get even more flexibility by having your money outside one of these accounts.

Any 529 plan contributions you make should go a long way

When it comes to funding a 529 plan, there’s really no right or wrong approach. Sparling also points out that not everyone can make a significant lump-sum contribution to a 529 plan, so for many people, spreading out contributions over time is the only feasible option.

No matter which option you choose, as Sparling says, “Regardless of when contributions are made, every dollar saved for college can help offset future costs and increase college options for their grandchildren.”

Maurie Backman is a freelance contributor to Kiplinger. She has over a decade of experience writing about financial topics, including retirement, investing, Social Security, and real estate. She has written for USA Today, U.S. News & World Report, and Bankrate. She studied creative writing and finance at Binghamton University and merged the two disciplines to help empower consumers to make smart financial planning decisions.