How Filing Taxes Separately Can Save You Thousands on Student Loans
Tax filing season is here, and if you're married with federal student loans and planning toward forgiveness, how you file taxes matters more than you might think.
For IDR - Income Is the Biggest Lever
When using income-driven repayment (IDR) plans toward forgiveness, your IDR payments are calculated based on income and family size.
Lower income + higher family size = lower payments = lower total loan costs.
The biggest lever to plan around is your income. You're probably not going to adopt a bunch of kids for the sake of student loan planning.
The Filing Status Question
When you file taxes married filing jointly, your student loan payment calculation includes your combined household income - even if only one of you has loans. That can push your monthly payment significantly higher.
But when you file married filing separately, you can exclude your spouse's income for the loan calculation. This means your loan payments only reflect your individual income, not your spouse's.
The Math in Practice
Here's what this looks like in real numbers:
Take a married couple with no kids, each earning $120,000 (total $240,000). If only one spouse has federal student loans and they're using the Old IBR plan:
- Filing jointly: $2,593/month ($31,116/year)
- Filing separately: $1,199/month ($14,388/year)
That's over $16,000 in annual savings - a difference that can completely change whether forgiveness makes sense for you.
Community Property States Have Even More Opportunities
If you're in Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, Wisconsin, or Alaska (opt-in), the planning opportunities expand further.
In these states, when you file separately, your income and deductions split 50/50 between spouses for both tax and student loan purposes.
Example: You're a practice owner earning $300,000, and your spouse doesn't work. You have $280,000 in student loans.
Your income is higher than you loans balance. Off the bat, you're assuming forgiveness is out of the cards.
What happens if you file taxes separately in a community property state?
- Filing jointly: $2,960/month in loan payments
- Filing separately (community property state): $1,574/month
Monthly savings: nearly $1,395, or $16,74 per year.
And if you're the lower-earning spouse with the loans? You can use alternative documentation like pay stubs to show your actual lower income instead of the split tax return.
What About the Tax Cost?
Filing separately does create additional tax costs:
- Potentially higher tax brackets for the higher-earning spouse (in non-community property states)
- Lost child and dependent care tax credits
- Forced backdoor Roth IRA contributions (direct contributions phase out at $10,000)
- No student loan interest deduction (you likely phase out anyway)
- No ACA premium tax credits
But here's the key: you simply compare the student loan savings against the extra tax cost. If the loan savings outweigh the tax hit, filing separately makes sense. In practice, the student loan math often wins.
Critical Timing Considerations
Once you file jointly and the April deadline passes, you're locked in - you cannot amend back to separate returns for student loan purposes.
But if you file separately? You can amend back to joint returns later if you need to recoup some of those tax costs after you've certified your income for student loans.
If you're unsure which way to go, consider filing a tax extension. Give yourself time to run both scenarios properly before committing.
What to Do Now
Work with your tax and financial professionals to run projections both ways - joint versus separate. Compare the numbers.
Student loan planning and tax planning aren't separate conversations - they work hand in hand. Your IDR payment is effectively an additional 10-15% tax on your income, and that should factor into every tax decision you make.
If you want to dive into this even more, check out this week's podcast episode below 👇.
Need help running these numbers? We help optometrists navigate exactly these kinds of decisions every tax season. Schedule a conversation to talk through your specific situation.
Have a great weekend!
Evon Mendrin, CFP®, CSLP®
aNew From Our Education Hub
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Podcast Ep. 151: How Filing Taxes Separately Impacts Student Loan Outcomes
I talk about just how much your tax filing matters for federal student loan planning
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Podcast Ep. 150: Four Tax Planning Levers You Can Still Pull for 2025
I dive into four tax planning moves you can still make to impact 2025 taxes.
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