Student Loan Interest Deduction Calculator (US)

Enter Calculation

Filing Status Single / HoH / MFS Married Filing Jointly

Student Loan Interest Paid ($)

Modified AGI ($)

Marginal Tax Rate (%)

Results

Allowable Student Loan Interest Deduction

$2,000

reduces your taxable income

Base deduction (capped at $2,500)	$2,000
Estimated tax savings	$440

What Is the Student Loan Interest Deduction?

This calculator applies to United States federal income tax (2024 tax year rules). The student loan interest deduction lets eligible borrowers subtract up to $2,500 of interest paid on qualified education loans directly from their taxable income — an "above-the-line" deduction, meaning you can claim it even if you don't itemize. The benefit phases out as your Modified Adjusted Gross Income (MAGI) rises.

How to Use It

Choose your filing status, enter the student loan interest you paid during the year, your MAGI, and your marginal tax rate. The calculator caps interest at $2,500, applies the income phase-out, and estimates how much federal tax you save.

The Formula Explained

First, eligible interest is capped: \(\text{base} = \min(\text{interest},\ \$2{,}500)\). Then the phase-out reduces it. For 2024 the range is $80,000–$95,000 MAGI (Single/HoH) or $165,000–$195,000 (Married Filing Jointly). Below the start you keep the full amount; above the end you get nothing; in between the deduction shrinks proportionally. Tax savings = deduction × marginal rate.

$$\begin{gathered} \text{Tax Savings} = D \times \frac{\text{Rate (\%)}}{100} \\[1.5em] \text{where}\quad \left\{ \begin{aligned} D &= B \times \left(1 - \frac{\text{MAGI} - 80000}{15000}\right) \\ B &= \min\!\left(\text{Interest Paid},\ 2500\right) \end{aligned} \right. \end{gathered}$$

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The deduction stays at its maximum until MAGI reaches the phase-out start, then declines linearly to zero at the phase-out end.

Worked Example

A single filer paid $2,000 in interest with a MAGI of $80,000 and a 22% marginal rate. MAGI is at the phase-out start, so the full $2,000 is deductible. Estimated tax savings = $$\$2{,}000 \times 22\% = \mathbf{\$440}$$

How interest paid flows through the cap and phase-out to produce the final deduction and tax savings.

FAQ

Is the deduction the same as a tax credit? No. A deduction reduces taxable income; your actual savings equal the deduction times your marginal rate.

What counts as MAGI here? Generally your AGI with certain items (like the student loan interest deduction itself and foreign income exclusions) added back.

Can married-filing-separately filers claim it? No — the IRS disallows the deduction for the MFS status. This tool estimates only; consult a tax professional for filing.