Inaction has a cost. If you have an eligible child and you don't file Form 4547, the $1,000 government deposit never lands in their account — and every year of delay is a year of compounding the account never gets back. This article lays out the actual dollar cost of waiting, at every time horizon, plus what does and does not expire.
The Short Version
- The $1,000 is still available as long as you file before the child turns 18.
- Every year you wait costs compounding time that cannot be recovered.
- At 7% annual returns, a single year of delay on the $1,000 seed costs roughly $220 off the final balance by age 18.
- Never filing means the $1,000 stays with the Treasury. Your child gets nothing.
What You Lose by Waiting
The $1,000 government deposit doesn't start growing until the account opens, and the account doesn't open until Form 4547 is processed. Every year between birth and filing is a year the money sits on the sidelines.
At a 7% average annual return, here's what the $1,000 seed alone grows to by age 18, depending on when you file:
| File at child's age | Final balance at 18 | Lost to delay |
|---|---|---|
| 0 (newborn) | ~$3,380 | — |
| 1 | ~$3,160 | ~$220 |
| 2 | ~$2,950 | ~$430 |
| 3 | ~$2,760 | ~$620 |
| 5 | ~$2,410 | ~$970 |
| 10 | ~$1,720 | ~$1,660 |
| 15 | ~$1,225 | ~$2,155 |
| 17 | ~$1,070 | ~$2,310 |
The numbers get worse the closer you get to age 18 because you're losing the highest-compounding years. A year lost in infancy costs one year of early growth; a year lost at age 15 costs one year of the account's largest absolute gains.
Estimates assume a 7% average annual return (roughly the long-run S&P 500 return after inflation). Not a guarantee — all investing involves risk, including possible loss of principal.
What You Lose If You Contribute Beyond the Seed
The math gets more dramatic if you were planning to add monthly contributions. Let's say you planned to add $100/month for the life of the account:
| File at child's age | Final balance at 18 | Lost to delay |
|---|---|---|
| 0 (newborn) | ~$43,300 | — |
| 1 | ~$39,500 | ~$3,800 |
| 3 | ~$32,700 | ~$10,600 |
| 5 | ~$26,700 | ~$16,600 |
| 10 | ~$14,200 | ~$29,100 |
A 5-year delay on a $100/month contribution plan costs the child about $16,600 of final balance — and you can't make that up by contributing more later, because the $5,000/year cap is not retroactive.
What You Don't Lose
Delay is expensive, but it's not terminal. Here's what doesn't go away when you miss a filing window:
- Eligibility. A child born between January 1, 2025 and December 31, 2028 remains eligible until their 18th birthday. No year-by-year cutoff.
- The $1,000 amount. The deposit is a flat $1,000 regardless of when you file. It isn't prorated.
- The contribution cap. The $5,000/year cap applies each year going forward once the account opens.
- The tax treatment. Tax-free growth still applies regardless of when the account is funded.
The only thing lost is compounding time. That's the entire penalty.
The "I Never Got Around to It" Scenario
If you never file Form 4547, the child never has a 530A account and never receives the $1,000. There is no automatic enrollment, no retroactive claim at age 18, no grandfathering. The Treasury simply doesn't transfer the funds.
This is the single most avoidable loss in the program. The form takes about 10 minutes. The $1,000 is free. There is no income test, no means test, no documentation demand beyond the child's SSN. A filing deadline you can hit any time in an 18-year window is about as forgiving as the IRS gets — but if you never hit it, the money stays on the Treasury's books and the child misses out.
How to Catch Up If You're Already Behind
If you're reading this and realizing you should have filed a year or three ago, the answer is simple: file now.
- Open the Form 4547 Filler. It asks the same questions as the paper form and prints a PDF with the correct IRS mailing address for your state.
- Mail the signed form using tracked shipping (Certified Mail, Priority Mail, UPS, or FedEx).
- Wait 6–8 weeks for the IRS to process the filing, the Treasury to deposit $1,000, and Robinhood to open the custodial account.
- Optionally begin monthly or annual contributions once the account is live.
Detailed mailing addresses and post-deadline procedure live in I Missed the April 15 Deadline.
Why the Early Years Matter Most
Compounding is front-loaded. A dollar invested at age 0 has 18 years to double-and-redouble; a dollar invested at age 10 has only 8. At 7% annual returns, money roughly doubles every 10 years — which means the first 10 years do more work than the last 8.
This is why the Section 530A program was structured to target newborns. The $1,000 deposit sitting from age 0 is worth far more than the same $1,000 deposit at age 10, and the program's value depends on parents actually filing early rather than eventually.
None of this means filing late is pointless. A $2,400 balance at age 18 from a 5-year-delayed filing is better than $0 from never filing. It just means the best time to file was at birth, and the second-best time is now.
Common Questions
Is there any way to get the money without filing Form 4547?
No. Form 4547 is the only mechanism. No automatic enrollment, no opt-in at the hospital, no retroactive claim at tax time. The form is the gate.
If I wait too long, will the child lose eligibility?
Eligibility expires on the child's 18th birthday. Before that, you can file at any time, though the compounding math gets less favorable each year.
Does the $1,000 grow while it's sitting at the Treasury waiting for me to file?
No. The Treasury doesn't set aside $1,000 in your child's name in advance. The money is only issued when Form 4547 is accepted, and only starts compounding after it lands in the Robinhood account.
What if I filed but the form was rejected?
The $1,000 isn't lost. Fix the error (usually an SSN/name mismatch) and refile. See How to File Form 4547 for the common rejection reasons.
Do I get penalized for filing late?
No. Form 4547 has no filing fee, no late penalty, and no required justification. The IRS processes the filing whenever it arrives.
Does this math apply to older kids whose parents already missed several years?
Yes — but the catch-up lost is smaller in absolute terms because there are fewer compounding years remaining. A 10-year-old has 8 years left, so the $1,000 grows to roughly $1,720 instead of $3,380 for a newborn. Still real money. Still worth filing.
The Bottom Line
Doing nothing is the single most expensive choice available in the 530A program. The $1,000 is free, the filing is simple, and the cost of waiting compounds against you each year. If you haven't filed, file this week. If you're behind by a year or more, mail it today — every month still matters.
Start with the Form 4547 Filler. It takes about 10 minutes.
This article is general educational information, not tax or investment advice. All investing involves risk, including possible loss of principal.