Most parents treat their own return and their college student’s return as two separate jobs. Different accountants, or theirs in March and the kid’s in April, and nobody checks whether the decisions on one side work with the decisions on the other. It’s fine until it isn’t, and when it isn’t, it shows up as a missed credit or a smaller refund than there should have been.
For a business owner, the stakes run higher, because you have more moving parts. Self-employment income that swings, deductions that push your adjusted gross income around, retirement contributions that decide whether you qualify for education credits at all. Add a student and a handful of decisions have to be made together rather than separately. They’re not complicated decisions on family tax coordination. They just have to happen before anything is filed.
When Your Kid’s Tax Return Starts Affecting Yours
The moment a child starts earning income, the two returns start to interact, and the decisions you make on your return can have real consequences for what they owe and vice versa. The dependency claim is the starting point for almost everything. If you claim your college student as a dependent, their own standard deduction gets limited, and the education credits flow to your return instead of theirs. If they file independently, the credits might be worth more to them than to you, or less. It depends on the income on both sides, which is why the dependency claim is the first decision to make rather than the last.
For small business owners, the complication is that your taxable income from the business shapes which credits you can actually use. The American Opportunity Tax Credit (AOTC) covers up to $2,500 a year during the first four years of college, and it phases out over a range rather than falling off a cliff. Per IRS Publication 970, it shrinks between $80,000 and $90,000 of modified adjusted gross income for single filers, and between $160,000 and $180,000 for married filing jointly. Above the top of that range, you get nothing, even though you paid the tuition. A strong year in the business is exactly what pushes a family through it.
The Dependency Question That Changes Everything
Claiming your student is not automatic, and whether it makes sense financially is a separate question from whether you’re allowed. A qualifying child has to be under 24, a full-time student for at least five months of the year, and not providing more than half their own support. Most traditional students clear that easily. Once they’re working a real job, taking a gap year, or living off savings, it changes.
The financial calculation comes down to where the education credits land. The AOTC is worth up to $2,500, with 40% of it (up to $1,000) refundable, meaning it can reduce your tax bill below zero and generate a refund even if you owe nothing. If your income is within the phase-out range, you still get a partial credit. If you’re over the threshold, you get nothing, and the question becomes whether your student would be better off claiming it on their own return. A student with even modest earned income might qualify for the full credit, and in some cases it puts more money back in the family overall.
Which Education Tax Credits Can Your Family Actually Use?
There are two main federal education credits, and they work quite differently. The AOTC applies only to the first four years of a degree. Per the IRS, it covers 100% of the first $2,000 of qualified expenses plus 25% of the next $2,000, for a maximum of $2,500, and 40% of it is refundable. The Lifetime Learning Credit covers 20% of the first $10,000 in qualified expenses, up to $2,000 per return, is not refundable, and has no cap on how many years you can use it, which makes it the one that matters for graduate school or part-time study. Both credits phase out over the same income range.
One rule catches families off guard every year: you cannot take both credits for the same student in the same year. You pick one. For most families with a traditional four-year student, the AOTC is the better choice because the maximum is higher and part of it is refundable. The LLC becomes useful when the student is beyond their fourth year or pursuing a graduate degree. Qualified expenses for both credits include tuition and required fees but not room and board, which is a common source of confusion when people are totaling up what they paid.
529 Plan Withdrawals and The Credit Coordination Trap
If you’re using a 529 college savings plan to pay tuition, you need to be careful about how you time and size your withdrawals, because the IRS does not let you count the same tuition dollar for both a 529 tax-free distribution and an education credit. The rule is called the “coordination requirement,” and it means that any qualified education expense paid with a 529 withdrawal cannot also be used as the basis for the AOTC or the LLC.
In practice, that means paying a slice of tuition out of pocket, claiming the credit on those dollars, and running the rest through the 529. The AOTC maxes out on the first $4,000 of qualified expenses, so covering roughly that much from your own account and the remainder from the plan preserves the tax-free withdrawal and still captures the full credit. Getting it wrong in either direction – draining the 529 for everything and losing the credit, or claiming the credit on 529-funded expenses – costs real money. This is exactly the kind of planning worth doing in summer rather than the week before the return is due. Which brings us to the one that surprises people most.
The Kiddie Tax applies even when you don’t expect it
The Kiddie Tax (formally IRC Section 1(g)) taxes a dependent child’s unearned income, meaning investment earnings, dividends, and capital gains, at the parent’s marginal rate rather than the child’s. It applies to full-time students under 24 whether or not the parent actually claims them. For 2026, the reduction amount is $1,350 under Rev. Proc. 2025-32, which means unearned income above $2,700 gets taxed at your rate, not theirs.
This bites business owners specifically. If you set up a custodial or UTMA account for your student, or they inherited investments, the dividends and gains get pulled into your rate even though the assets are theirs. A strong year in the business can mean your kid’s modest portfolio is taxed at your top bracket instead of the bottom one. Worth running before assuming the investments are neutral.
How FAFSA Sees Your Tax Decisions
Financial aid eligibility runs on a formula that weighs household income heavily, and for small business owners, the income figure that matters most is the adjusted gross income (AGI) from your federal return. The FAFSA (Free Application for Federal Student Aid) uses prior-prior year tax data, meaning a 2026-2027 aid application uses your 2024 return. That two-year lag gives you a planning window, but it also means decisions you made two years ago are still showing up in aid calculations today.
This is where year-round accounting earns its keep. If a prior year’s AGI was inflated by a one-time event, a business sale, a big retirement distribution, or a standout revenue year, that number is baked into the aid calculation whether it reflects today or not. There’s not much to do about it retroactively, but knowing the formula lets you time things better going forward. Retirement contributions reduce AGI without reducing your actual wealth.
Does your college student need to file their own return?
This is where a lot of parents use the wrong number. The 2026 standard deduction for a single filer is $16,100, but a student you claim as a dependent does not get that. Under Rev. Proc. 2025-32, a dependent’s standard deduction is capped at the greater of $1,350 or their earned income plus $450. So a dependent student earning $9,000 at a summer job shelters $9,450, not $16,100, and the filing math changes with it.
Even under the threshold, filing is often worth it. If a part-time job withheld tax, filing is the only way to get it back. And if your student is not claimed as your dependent and qualifies for the refundable part of the AOTC, not filing leaves money on the table.
Illinois runs on its own numbers, and there’s a trap in them. The Illinois exemption allowance is $2,925 for 2026, and a return is required once Illinois base income exceeds it. The catch: if you claim your student as a dependent and their Illinois income goes over $2,925, their exemption allowance drops to zero, so Illinois taxes them at 4.95% from the first dollar rather than above the allowance. Missouri sets its own threshold, and it is also low. If your student worked in either state, even for a summer, a state return is probably in play. “My kid doesn’t make much money” is not the same as “my kid doesn’t have to file.”
Getting Both Returns Right From The Start
The smartest move with two returns that affect each other is to look at them together before either is filed. One conversation covering your business income for the year, your student’s earned and unearned income, who claims the dependency, how tuition is getting funded, and which credits are actually on the table. From there, the filing strategy mostly writes itself, because the numbers tell you which arrangement puts the most back in the family.
The decisions that matter – dependency, 529 timing, which credit to take – all get made before anything is filed. Once the return is in, your options narrow a lot. If you have a student in the picture and a business on your return, this is the summer to sort both sides out together.
Reach out to the Thompson Flaherty team and let’s look at both returns together before filing season gets here.
