Earned Income Tax Credit (EITC) Calculator

About the EITC Calculator

This calculator estimates the federal Earned Income Tax Credit based on earned income, filing status, and number of qualifying children, using the three-part phase-in, plateau, and phase-out structure the actual credit follows. It gives lower and moderate income workers a quick way to see roughly what credit they might expect before filing.

How It Works

You enter earned income, filing status, and select the number of qualifying children (0, 1, 2, or 3+). The calculator looks up the credit rate, maximum credit, phase-out start, and phase-out rate for that number of children, computes the credit as it phases in with earnings, caps it at the maximum, then subtracts a phase-out reduction once income passes the relevant threshold for your filing status.

creditFromEarned = min(earnedIncome x phaseInRate, maxCredit); phaseoutReduction = max(earnedIncome - phaseoutStart, 0) x phaseoutRate; credit = max(creditFromEarned - phaseoutReduction, 0). Rates by children: 0 children - 7.65% phase-in, $649 max; 1 child - 34% phase-in, $4,328 max; 2 children - 40% phase-in, $7,152 max; 3+ children - 45% phase-in, $8,046 max. Phase-out starts at $10,620 (0 children) or $23,350 (1+ children) for single filers, and $17,250 / $29,640 for married filers, using 2025 approximate parameters.

Formula & Methodology

The credit works in two competing pieces that get combined. First, creditFromEarned grows linearly with earned income at the phase-in rate for your number of children until it hits the maxCredit cap, at which point additional earnings no longer increase this piece. Second, once earned income exceeds the phaseoutStart threshold for your filing status, a separate reduction grows linearly at the phaseoutRate. The final credit is creditFromEarned minus this reduction, floored at zero, meaning at low incomes the credit is rising, at moderate incomes it can sit near its maximum if phase-out has not yet caught up, and at higher incomes the phase-out reduction eventually drives the credit down to nothing.

Examples

Single parent with one child

A single filer with $25,000 in earned income and one qualifying child has creditFromEarned capped at the $4,328 maximum (since 34% of $25,000 exceeds it), and a phase-out reduction of ($25,000 - $23,350) x 0.1598 = about $264, giving an estimated credit of roughly $4,064.

Married couple with two children and higher earnings

A married couple with $40,000 in earned income and two qualifying children hits the $7,152 maximum credit from the phase-in side, then faces a phase-out reduction of ($40,000 - $29,640) x 0.2106 = about $2,182, for an estimated credit near $4,970.

Advantages

Applies the correct phase-in rate, maximum credit, and phase-out threshold automatically based on both filing status and number of children.
Shows in one number how earnings level interacts with family size to shape the credit, useful for understanding how an extra dollar of income affects the credit.
Gives a fast planning estimate without needing to consult the full IRS EITC table by hand.

Common Mistakes

Treating the estimate as a final, filing-ready number rather than a simplified approximation that skips investment income limits and age eligibility rules.
Forgetting that the phase-out threshold and maximum credit both change materially between single and married filing status.
Assuming the credit keeps rising with income indefinitely, when in fact it plateaus at the maximum and then declines once the phase-out threshold is crossed.

Edge Cases to Watch For

Entering more than 3 qualifying children is treated identically to exactly 3, since the parameter table caps at index 3 using Math.min(children, 3).
The credit is floored at zero, so once the phase-out reduction exceeds the phase-in amount, the calculator reports no credit rather than a negative number.
This is a simplified estimate that does not apply the investment income limit, age requirements for filers with no qualifying children, or other detailed eligibility tests used in the official EITC tables.
Because the phase-in and phase-out are both linear approximations rather than the IRS's official table lookups, results near bracket boundaries may differ slightly from the exact published credit amount.

Common Use Cases

Working parents estimating their expected refund credit before filing a return.
Tax preparers giving clients a quick sanity check on EITC eligibility and rough size before full return preparation.
Individuals deciding whether additional earned income in a given range would increase or decrease their net credit due to the phase-out zone.

Frequently asked questions

Why does EITC increase and then decrease as earned income rises?

The credit is designed with three zones: it phases IN as a percentage of early earnings (rewarding work), plateaus at a maximum credit across a middle income range, then phases OUT as income rises further - this structure is meant to boost the effective earnings of lower-income workers most in the phase-in range while still tapering off support as income grows toward self-sufficiency.

Related calculators

Income Tax EstimatorEstimate your US federal income tax using 2025 marginal tax brackets.Self-Employment Tax CalculatorEstimate self-employment tax (Social Security + Medicare) on your net earnings.Sales Tax CalculatorCalculate sales tax and total price for a purchase.VAT CalculatorAdd or remove VAT from a price.

Conclusion

The EITC calculator translates the credit's phase-in, plateau, and phase-out structure into a single estimated dollar figure based on your income, filing status, and children. Because it uses simplified 2025 parameters rather than the full official table and eligibility rules, it should be treated as a planning estimate rather than a final filing figure.