W-2 Box 10 — Dependent care benefits

What Box 10 means

Box 10 reports the total dependent care benefits your employer provided during the year — almost always your own contributions to a Section 129 dependent care flexible spending account (DCFSA), plus any dependent care your employer paid for directly outside a plan. For tax years through 2025, IRC §129(a)(2)(A) caps the amount you can exclude from wages at $5,000 ($2,500 if married filing separately). OBBBA (P.L. 119-21, §70404) raised that cap to $7,500 ($3,750 MFS) for tax years beginning after 2025 — a fixed increase, not indexed for inflation, and the first permanent change to this limit since it was set in 1986 (a one-year, pandemic-era increase for 2021 under ARPA §9632 aside).

Whatever your employer contributes above the applicable cap doesn't get the exclusion — it's added back into Box 1 as ordinary taxable wages, and it's already included in Boxes 3 and 5 for Social Security and Medicare purposes, since FICA tax applies to DCFSA contributions regardless of the income-tax exclusion. If Box 10 and your own FSA elections don't match, check whether your employer also paid for on-site or off-site dependent care outside your payroll deduction — that value gets folded into Box 10 even though it never showed up on a pay stub.

You must complete Part III of Form 2441 whenever Box 10 carries an amount — it's how you tell the IRS how much of the benefit actually qualifies for the exclusion. Part III has to be worked through before you calculate the Part II credit, because it establishes both the amount excluded and the qualifying-expense dollar limit still available for the credit on any remaining costs. Skip Part III and the return effectively assumes you had no qualifying dependent care expenses, which pulls the full Box 10 amount into taxable income.

Box 10 and the Child and Dependent Care Credit (Form 2441 Part II) draw from the same pool of expenses, so you can't apply both to the same dollar. The credit's work-related expense limit — $3,000 for one qualifying person, $6,000 for two or more, both fixed statutory amounts under §21(c) that are not indexed — is reduced dollar-for-dollar by whatever you excluded through Box 10. If your qualifying expenses exceed your DCFSA contributions, the remainder can still generate a credit; if your DCFSA already used up the full expense limit, there's no additional credit stacked on top.

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