Every year, families leave billions of dollars in financial aid on the table. Sometimes it is because they never filed the FAFSA at all. Other times, a single wrong number on the form sends their aid package in the wrong direction. Most of these mistakes happen not because families are careless, but because the FAFSA is genuinely confusing.
The good news: once you know where the pitfalls are, they are easy to avoid. Here are ten of the most frequent FAFSA mistakes, what they can cost you, and how to steer clear of each one.
1. Not Filing the FAFSA at All
This is the single most expensive mistake a family can make. According to NerdWallet, an estimated $3.58 billion in federal Pell Grants goes unclaimed every year because students never submit the FAFSA. That works out to roughly $5,842 per eligible student, per year -- money that does not need to be paid back.
Many families skip the FAFSA because they assume their income is too high to qualify. But the FAFSA is not just for low-income families. Middle-income households often qualify for subsidized federal loans, work-study, and sometimes state or institutional grants. Even if your family earns $150,000 a year, you could still receive aid at higher-cost schools.
How to avoid it: File the FAFSA no matter what. It is free, and you have nothing to lose. If you want to see how your family's finances might affect aid at specific schools, try the CollegeLens school planning tool before you file.
Potential cost: Up to $5,842 per year in lost Pell Grant money alone, plus federal loans with better terms and state grants.
2. Filing Late
The FAFSA opens on October 1 for the following academic year. While the federal deadline is June 30, many states and colleges have much earlier deadlines -- some as early as February. Financial aid is often distributed on a first-come, first-served basis, especially for state grants and campus-based programs like Federal Work-Study.
According to Forbes, filing even a few weeks late can mean the difference between a full state grant and nothing. In states like California and Indiana, where Cal Grants and the Frank O'Bannon Grant have strict early deadlines, a late filing could cost your family $3,000 to $7,000 per year.
How to avoid it: File as close to October 1 as possible. Set a calendar reminder in September. Do not wait until you have been accepted to a school -- you can and should file before admission decisions come in.
Potential cost: $3,000 to $7,000 or more per year in lost state grant aid.
3. Using the Wrong Social Security Number
Entering an incorrect Social Security Number is one of the most common reasons FAFSA applications get rejected. NASFAA reports that SSN mismatches are among the top causes of processing delays. When your SSN does not match Social Security Administration records, your application cannot be processed -- full stop.
This happens more often than you would think, especially when a parent and student have similar numbers, or someone is typing quickly on a small screen.
How to avoid it: Have your Social Security card in front of you when you fill out the form. Double-check every digit. If you are a parent, make sure you enter your SSN in the parent section and your student's SSN in the student section.
Potential cost: A rejected or delayed application can mean missing deadlines entirely, costing thousands in lost aid.
4. Reporting Retirement Accounts and Home Equity as Assets
The FAFSA does not ask you to report the value of your primary home, retirement accounts (401(k), IRA, pension plans), or small family farms. But every year, families report these anyway -- and it inflates their Student Aid Index (SAI) by thousands of dollars.
According to the Federal Student Aid Handbook, these assets are explicitly excluded. When families report them by mistake, their SAI goes up and their aid goes down.
How to avoid it: Read each asset question carefully. If the form asks about "investments," that does not include retirement savings or your home. It means stocks, bonds, real estate other than your primary home, and business holdings. When in doubt, check the help text next to each question.
Potential cost: Reporting a $200,000 retirement account as an asset could reduce your aid eligibility by $10,000 or more over four years, depending on the formula.
5. Listing the Wrong Parent for Divorced or Separated Families
This is one of the most confusing parts of the FAFSA, and the rules changed under the FAFSA Simplification Act starting with the 2024-25 cycle. Previously, the FAFSA asked for information from the parent the student lived with most. Now, it asks for information from the parent who provided the most financial support during the relevant tax year.
This change caught many families off guard. If your parents are divorced and you live with your mom but your dad pays most of your expenses, the FAFSA now wants your dad's information. If that parent has remarried, the stepparent's income must be reported too.
Getting this wrong can dramatically change your aid package, potentially shifting your SAI by tens of thousands of dollars.
How to avoid it: Before you start the FAFSA, figure out which parent provided the most financial support in the relevant tax year. This is not about who you live with -- it is about who paid more toward food, housing, and medical care. If it is close to 50/50, the Federal Student Aid website has guidance on tiebreaker rules.
Potential cost: Reporting the wrong parent could shift your SAI by $10,000 to $30,000, significantly reducing grant offers.
6. Not Using the IRS Direct Data Exchange
Starting with the 2024-25 FAFSA, the IRS Direct Data Exchange (DDX) replaced the old IRS Data Retrieval Tool. The DDX automatically transfers your tax information from the IRS directly into your FAFSA. It is faster, more accurate, and -- critically -- it means you are far less likely to be selected for verification.
When you enter tax information by hand, you open the door to typos and mismatched numbers. NASFAA notes that applications completed without the data transfer tool are significantly more likely to be flagged for verification, which delays your aid by weeks or months.
How to avoid it: When prompted during the FAFSA, agree to use the IRS Direct Data Exchange. Both the student and any contributing parent or spouse should connect their IRS data. It takes just a few minutes.
Potential cost: Being selected for verification can delay your aid package by 4 to 8 weeks. If that pushes you past a school or state deadline, you could lose thousands in grant money.
7. Forgetting to Sign the FAFSA
Your FAFSA is not complete until both the student and a parent (for dependent students) sign it. Filing online means creating an FSA ID -- a username and password that acts as your legal signature. Many families fill out the entire form but never actually sign and submit.
According to Federal Student Aid, both the student and one parent each need their own separate FSA ID. You cannot share one. Creating an FSA ID can take up to three days to verify. This is where families get stuck: they try to create the FSA ID and sign on the same day, hit a delay, and forget to come back.
How to avoid it: Create your FSA IDs well before you plan to fill out the FAFSA. Do this in September so you are ready to file when the form opens on October 1. Both you and your parent should each create an account at studentaid.gov.
Potential cost: An unsigned FAFSA is the same as no FAFSA. If you do not go back and sign, you receive zero federal or state aid.
8. Not Listing Enough Schools
You can list up to 20 schools on the FAFSA (up from the old limit of 10). Every school you list receives your FAFSA data and can use it to build your aid offer. If you do not list a school, that school cannot offer you federal or institutional aid.
Some families only list one or two schools. But you cannot compare aid packages if you only have one. Listing more schools gives you more options and more room to find the best deal.
How to avoid it: List every school you are even slightly considering. There is no penalty for listing more, and you can always remove one later. You might be surprised by the aid offer you get.
Potential cost: Missing out on a school that would have offered you $5,000 to $15,000 more in aid because they never received your FAFSA.
9. Reporting Net Worth Instead of Current Balance for Businesses
If you or your parent owns a small business with more than 100 employees, the FAFSA asks you to report its net worth. Here is where it gets tricky: net worth is not the same as what the business is currently "worth" on the market. Net worth on the FAFSA means current market value of the business minus any debts the business owes.
Some families report the total value without subtracting debts. Others report annual revenue, which is a completely different number. Either mistake makes your family look wealthier than you are, driving your SAI up and your aid down.
Important: if the business has 100 or fewer full-time employees and is owned and controlled by your family, it does not need to be reported at all. Many small business owners do not know this.
How to avoid it: If your family business has 100 or fewer employees, skip the business asset question -- you are exempt. If you must report, take the current market value and subtract all outstanding debts. Do not use revenue, profits, or tax valuations. The Federal Student Aid Handbook has detailed definitions.
Potential cost: Over-reporting a business asset by $100,000 could increase your SAI by several thousand dollars per year, reducing grants and increasing your expected out-of-pocket costs.
10. Rounding Errors and Transposing Digits
This one is easy to dismiss, but small numerical errors add up fast. Typing $56,000 instead of $65,000 (transposed digits) changes your income by $9,000. Rounding your savings from $14,872 to $15,000 might not seem like a big deal, but across multiple fields, these rounding errors can shift your SAI in either direction.
NASFAA research consistently shows that manual data-entry errors are one of the leading causes of verification selection. If the numbers on your FAFSA do not match your tax return, you will be flagged, and you will need to submit additional documentation to prove your information is correct.
How to avoid it: Use the IRS Direct Data Exchange (see Mistake 6) to auto-fill tax data. For other fields, enter exact amounts -- do not round or estimate. Have your tax return and bank statements in front of you, and review every number before you hit submit.
Potential cost: Verification delays of 4 to 8 weeks, plus the risk of missing aid deadlines.
How to Fix Mistakes After You Submit
Made a mistake? Do not panic. You can correct your FAFSA after it has been submitted.
Review Your Student Aid Report (SAR)
Within three to five days of filing online, you will receive a Student Aid Report (SAR). The SAR summarizes your FAFSA information and shows your Student Aid Index. Read it carefully -- this is your chance to catch errors before schools build your aid packages.
Make Corrections Online
Log back into studentaid.gov and select "Make a Correction." You can update most fields directly. Both the student and parent will need to re-sign after corrections. Updated information is automatically sent to all the schools you listed.
Contact Your School's Financial Aid Office
If you realize a mistake after a school has already sent you an aid offer, call their financial aid office. Aid counselors deal with FAFSA corrections every day -- they are there to help, not to judge.
Act Quickly
The sooner you correct errors, the better. Some aid programs have firm deadlines, and corrections made after those deadlines may not count. If you catch a mistake, fix it the same day.
The Bottom Line
The FAFSA is not a test, and there is no shame in getting tripped up by a form that asks complicated questions in confusing ways. The rules around divorced parents changed recently. The asset questions are not intuitive. Even the sign-in process has its own set of challenges.
What matters is that you file, you file early, and you take a few extra minutes to double-check before you submit. Those minutes could be worth thousands per year -- and tens of thousands over four years.
If you want to see how much aid you might qualify for at specific schools, CollegeLens can help you build a plan. It is designed to make this process clearer and less stressful for your whole family.
You have got this. And if you hit a roadblock, we are here to help.
-- Sravani at CollegeLens