Three separate tax benefits exist for healthcare and dependent care expenses, and they operate very differently from each other. The health FSA reduces taxable income by letting you pay medical expenses pre-tax. The dependent care FSA (DCFSA) reduces taxable income by letting you pay childcare pre-tax. The §21 dependent care credit directly reduces your tax bill by a percentage of qualifying childcare costs. The critical constraint: you cannot use the same dollar of expense for both the DCFSA exclusion and the §21 credit. Understanding the coordination rule is the difference between optimizing and accidentally double-counting.
Health FSA salary reduction limit: $3,400. Carryover to 2027: up to $680 (if plan allows). Use-or-lose otherwise applies. Available at the start of the plan year - you can front-load spending.
Dependent Care FSA (DCFSA) limit: $5,000 per household (statutory under IRC §129 - not indexed for inflation, unchanged for decades). Married filing separately: $2,500 each. Available only as you contribute - not front-loaded.
§21 Dependent Care Credit: 20% to 35% of qualifying expenses up to $3,000 (one qualifying person) or $6,000 (two or more). Phase-out of the 35% rate begins at $15,000 AGI; floors at 20% above $43,000. Non-refundable.
A health Flexible Spending Account under IRC §125 allows employees to elect a salary reduction of up to $3,400 for 2026 to pay qualified medical, dental, and vision expenses with pre-tax dollars. The contribution avoids federal income tax, Social Security tax, and Medicare tax - effectively reducing the cost of medical expenses by your marginal tax rate plus 7.65% in FICA savings. A person in the 24% bracket paying $3,400 into an FSA saves approximately $1,081 in combined income tax and FICA.
The health FSA is front-loaded: the full election amount is available on day one of the plan year even though contributions are made throughout the year via payroll deductions. This creates a valuable float for early large medical expenses - you can spend the entire $3,400 in January and then leave the employer in February, owing nothing back.
The Dependent Care FSA allows employees to set aside up to $5,000 per household of pre-tax salary to pay for qualifying childcare expenses for children under age 13 or for a dependent who is physically or mentally unable to care for themselves. Qualifying expenses: daycare centers, after-school programs, summer camps (not overnight), and in-home care providers. The $5,000 limit is per household - two spouses cannot each contribute $5,000.
Unlike the health FSA, the DCFSA is not front-loaded. Funds are available only as they are contributed via payroll deductions. If you need to pay for childcare in January but have only contributed $500 by that point, only $500 is available in the account.
Separately, IRC §21 provides a tax credit equal to 20% to 35% of qualifying dependent care expenses up to $3,000 for one qualifying person or $6,000 for two or more. The credit percentage is 35% for AGI at or below $15,000, declining by 1 percentage point per $2,000 of AGI, flooring at 20% for AGI above $43,000. Most middle and upper-middle income families use the 20% rate. The credit is non-refundable - it reduces your tax liability to zero but cannot create a refund.
You cannot use the same expense to claim both the DCFSA exclusion and the §21 credit. The $5,000 excluded through the DCFSA must be subtracted from the §21 credit base. If you have one child and $7,000 of qualifying expenses, $5,000 is used for the DCFSA, leaving $2,000 for the §21 credit (not the full $3,000 limit). At the 20% credit rate, that produces a $400 credit. If you had put only $3,000 in the DCFSA, the remaining $4,000 could be used for the §21 credit - but $3,000 is the maximum credit base for one child, so the credit base is $3,000 minus $3,000 in DCFSA = $0 credit. The math generally favors maximizing the DCFSA to $5,000 first because the pre-tax exclusion saves both income tax and FICA on the first $5,000, while the credit is non-refundable and only reduces income tax at 20%.