Dependent Care FSA vs Tax Credit Calculator

How this calculator works

The Dependent Care FSA and the Child & Dependent Care Tax Credit (CDCTC) are the two federal mechanisms that help families offset paid childcare costs. They work differently, save you different amounts of money, and one almost always wins — but the answer depends on your income, filing status, kid count, and what your employer offers.

Dependent Care FSA

A Dependent Care FSA is a pre-tax payroll deduction your employer offers during open enrollment. Money is taken out of your paycheck before federal income tax, state income tax, and FICA (Social Security + Medicare) are calculated. The 2026 cap is $5,000 per household, regardless of how many kids you have. The savings come at your marginal income tax rate (10–37% federal depending on bracket) plus the 7.65% FICA tax — which the Tax Credit doesn't touch.

The downside: you have to decide your contribution before the year starts, and unused dollars are forfeited at year-end (the "use-it-or-lose-it" rule). Estimate conservatively if you're unsure.

Child & Dependent Care Tax Credit (CDCTC)

The CDCTC is a federal income tax credit you claim on your annual return (Form 2441, attached to Form 1040). The credit is a percentage of qualifying expenses, capped at $3,000 of expenses for 1 child or $6,000 for 2+ children. The percentage slides with your AGI: 35% at AGI of $15,000 or below, dropping by 1% per $2,000 of additional AGI, down to a floor of 20% at AGI of $43,000 and above.

Worth knowing: the CDCTC is non-refundable, so it can only reduce your tax liability to zero — it can't generate a refund beyond what you'd otherwise owe.

The stacking question

You can technically use both — but you can't double-count the same dollar. If you have one child and contribute the full $5,000 to an FSA, you've already zeroed out the $3,000 CDCTC ceiling, so no credit is left to claim. With two or more children, a full $5,000 FSA contribution still leaves $1,000 of CDCTC headroom (since the cap is $6,000 minus the $5,000 already excluded). That last $1,000 at your CDCTC rate is real money — worth $200–$350 depending on your AGI band.

Why your AGI matters so much

Your AGI determines two things at once: your marginal federal tax bracket (which sets your FSA savings rate) and your CDCTC percentage. As AGI rises, the FSA's savings climb (you're avoiding higher-bracket tax) while the CDCTC's percentage falls. Above AGI ~$43,000, the FSA almost always wins by a clear margin. Below ~$30,000, the CDCTC has the edge.

State tax adds 1–5% more

Most states peg their income tax to your federal AGI. Because the FSA contribution lowers your AGI, it also lowers your state tax bill — a benefit the CDCTC doesn't share at the state level. In a state with a 5% income tax rate, the FSA's effective savings are roughly 5 percentage points higher than what our calculator shows. States with no income tax (Texas, Florida, Washington, Nevada, Tennessee, Alaska, South Dakota, Wyoming, New Hampshire) don't get this bonus.

What we don't model

Alternative Minimum Tax (AMT), state-specific child care subsidies, employer matching on FSA contributions (rare but exists), the Earned Income Tax Credit interaction with the CDCTC, and self-employment situations where the FICA math differs. For any of these, a CPA is worth the consult fee. Our calculator is built for the median W-2 household with a typical paid daycare arrangement.