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Interest rates may rise and fall, but the tax rules for deducting interest expenses tend to hold steady—unless Congress decides otherwise. The current framework has been largely in place since the Tax Cuts and Jobs Act (TCJA) of 2017, which introduced some significant adjustments. Knowing which interest expenses are deductible can have a real impact on your bottom line, especially if you’re working with experienced professionals like those offering McAllen tax services.

Whether you’re dealing with a home mortgage, student loans, or business financing, the deductibility of interest hinges on how the borrowed funds are used. The IRS separates interest into five broad categories, or “buckets,” each with its own rules. Here’s how to make sense of them.

1. Mortgage Interest

Mortgage interest is often one of the most substantial deductions available to taxpayers who itemize. But not all mortgage interest is treated the same.

Acquisition Debt
This refers to loans used to buy, build, or significantly improve a qualified home. To deduct interest on this type of debt, the mortgage must be secured by your main home or a second home, such as a vacation property. Under the TCJA, interest is deductible on up to $750,000 of acquisition debt for loans issued from 2018 through 2025. For mortgages taken out before December 16, 2017, the prior limit of $1 million still applies.

Home Equity Debt
Previously, interest on up to $100,000 in home equity loans or lines of credit was deductible regardless of how the funds were used. That changed with the TCJA. From 2018 through 2025, the deduction is suspended unless the borrowed money is used to substantially improve the residence. In those cases, it may be reclassified as acquisition debt, allowing you to deduct the interest if you itemize.

Keeping clear documentation is key, and McAllen tax services can help ensure your mortgage interest deductions are fully compliant and optimized.

2. Investment Interest

If you’ve borrowed money to make investments, the interest on that loan may be deductible—up to the amount of your net investment income. This deduction is only available to those who itemize.

Net Investment Income Includes:

• Interest income
• Royalties
• Annuities
• Other income typically derived from investment property

However, long-term capital gains and qualified dividends are excluded unless you elect to include them in your net investment income, forfeiting their preferential tax rates (typically 15% or 20%). The good news? This isn’t an all-or-nothing decision—you can pick and choose which gains or dividends to include.

Passive activity rules also come into play. If you’re not materially participating in an investment-related activity, current-year interest deductions may be limited to income generated from similar passive ventures. Real estate activities, for instance, are typically passive unless specific conditions are met.

If this sounds complicated, that’s because it can be. A consultation with professionals experienced in McAllen tax services can clarify your best options.

3. Business Interest

For many years, interest on loans for business operations was fully deductible. But the TCJA imposed new restrictions. Now, deductions are limited to 30% of the business’s Adjusted Taxable Income (ATI).

ATI Is Calculated Without:

• Income and deductions not linked to the business
• Net operating losses (NOLs)
• Business interest income and expense
• Qualified Business Income (QBI) deduction

Also important: prior to 2022, ATI included depreciation and amortization deductions, which are no longer included. This makes calculating ATI—and your allowable interest deduction—more nuanced.

Small Business Exemption
Businesses with average gross receipts of $29 million or less over the past three years are exempt from the 30% limit. For smaller enterprises, this often means the interest deduction remains fully intact.

Whether your business qualifies for the exemption or needs to strategize around the new limitations, working with a team offering McAllen tax services ensures you’re staying both compliant and efficient.

4. Student Loan Interest

Student loan interest offers a modest, yet valuable, deduction—up to $2,500 annually. Even better, it’s an “above-the-line” deduction, meaning you don’t have to itemize to claim it.

To Qualify:

• You must be legally obligated to repay the loan.
• The loan must be used to pay qualified education expenses like tuition, room and board, books, supplies, transportation, and certain fees.

This deduction phases out for higher-income earners based on Modified Adjusted Gross Income (MAGI) levels. Parents cannot claim the deduction if the student is the one legally responsible for the debt, even if the parents make the payments.

If you’re unsure whether you qualify or how much you can deduct, tax professionals in McAllen can evaluate your eligibility and maximize your savings.

5. Personal Interest

If the interest doesn’t fall into any of the previous categories, it’s typically considered personal—and nondeductible. This includes interest on credit cards, car loans for personal vehicles, and loans for vacations or other lifestyle purchases.

However, there’s often confusion when funds from personal and deductible categories are mixed in a single account. The IRS has detailed rules for tracing how borrowed money is spent, and missteps can cost you deductions.

To avoid this, keep borrowed funds separate and earmarked for specific uses. And if the line between personal and deductible becomes blurred, McAllen tax services can help sort it out with confidence and accuracy.

Final Thoughts

The IRS’s treatment of interest expense deductions is rooted in how borrowed money is used, not just where it comes from. Between tracing funds, navigating exemptions, and understanding deduction limits, the rules can be tricky to apply without expert guidance.

Whether you’re reviewing your mortgage documents, managing investment loans, or financing business growth, it’s wise to approach these tax rules with professional support. Burton McCumber & Longoria offers McAllen tax services that provide clarity, precision, and peace of mind—so you can focus on what matters most to you.

Need guidance on how interest expense deductions apply to you? Contact Burton McCumber & Longoria today to schedule a consultation with our McAllen tax services experts.