Having a Baby can Reduce your Tax Bill

Brennan McCarthy, CFP®

If the tax code were simply a bill, it would only be one page long. Instead, it is thousands of pages of "if/then" statements. By choosing to grow your family, you have stepped into one of the most incentivized roles in the American economy. Because the government wants the country’s population to grow, they’ve agreed to reduce your tax bill if you have children.

This is part four of our series on financially preparing for a baby. Here's what the tax code actually offers new parents — and how to make the most of it.

How Does Filing Jointly Lower Your Taxes as a Married Couple?

Before you and your spouse were married, you had been filing as Single. In almost every case (the exceptions are rare), as soon as a couple gets married, they can reduce their combined tax bill by filing married, filing jointly. Married filing jointly (MFJ) tax brackets are wider than single brackets, which means more of your combined income is taxed at lower rates.

For high-earning dual-income couples, this matters most at the bracket boundaries. A household with two incomes of $120,000 and $150,000 — $270,000 combined — filing jointly means a substantially lower overall tax bill than if they were taxed independently.

The wider MFJ brackets, combined with a higher standard deduction and some additional tax benefits I’ll discuss below mean that the year your baby is born could be a good time to revisit the paycheck withholding elections with your employer and ensure you're not over- or under-withholding for the new household reality.

What is the Child Tax Credit and How Much can New Parents Claim?

The most well-known benefit is the Child Tax Credit (CTC). For the 2025 tax year, the credit is worth up to $2,200 per qualifying child (up to 3 kids) under age 17. Credits are multiples more impactful in reducing a tax bill than deductions are. A tax credit reduces, dollar-for-dollar, your tax bill, while a deduction only reduces your taxable income.

The credit begins phasing out at a modified adjusted gross income (MAGI) of $400,000 for married couples filing jointly, reducing by $50 for every $1,000 above that threshold. For high earners bringing in more than $400,000/year, it’s important to run the numbers on whether you qualify for any portion of the tax credit.

One practical note: a newborn qualifies for the Child Tax Credit as long as they have a valid Social Security number issued before the tax return due date. This is why I encourage new parents to apply for the Social Security number at the hospital. This is one of the handful of important reasons to get your child’s SSN as soon as possible.

What is a Dependent Day Care FSA and How Does it Save Working Parents Money on Daycare?

If your employer offers a Dependent Care Flexible Spending Account (DCFSA), this is one of the most valuable and underutilized benefits available to working parents. It allows you to set aside pre-tax dollars specifically to pay for eligible childcare expenses, including daycare, preschool, and before- and after-school care.

The annual dependent care FSA contribution limit increased in 2026 from $5,000 to $7,500 for married couples filing jointly. This was the first increase since the limit was established in 1986. This still covers barely a fraction of what daycare costs for a newborn in any given year, but it’s still a benefit that should be taken advantage of.

The tax savings are real and immediate. If you're in the 22% federal bracket and contribute $7,500 to a DCFSA, you're saving roughly $1,650 in federal income taxes alone — before factoring in state taxes and FICA savings. FSA contributions also reduce wages subject to Social Security and Medicare taxes, for combined FICA savings of 7.65% regardless of your federal income tax liability.

One critical rule dual-income couples need to understand: the $7,500 limit applies to your household, not per spouse. If both spouses have access to a DCFSA through their respective employers, you cannot each contribute the maximum — your combined total cannot exceed $7,500.

How Does the Child and Dependent Care Tax Credit Work - and is it Better than a DCFSA?

Separate from the DCFSA — and often confused with it — is the Child and Dependent Care Tax Credit (CDCTC). This credit allows you to claim a percentage of qualifying childcare expenses paid during the year.

If you use an accountant, you don’t have to worry as much about what the thresholds are and how much you can claim, but it’s important to keep track of the care expenses you use throughout the year for your children.

The maximum expenses you can use to calculate the credit are $3,000 for one qualifying child, or $6,000 for two or more. For the 2025 tax year, the percentage of qualifying expenses you can claim ranges from 20% to 35% depending on your income — increasing to 20% to 50% starting with the 2026 tax year under recent legislation.

The important interaction to understand: if you contribute to a dependent care FSA, you must reduce your eligible childcare expenses for the tax credit by the same amount. For example, if you contribute $5,000 to an FSA and spent $6,000 on care for one child, only $1,000 remains eligible for the credit calculation. Contributing the maximum $7,500 to your FSA makes you ineligible for the CDCTC entirely.

In most cases, the Dependent Care FSA is the better move — the pre-tax savings and FICA reduction typically outweigh what the Dependent Care Tax Credit would have provided. But the right answer depends on your income and tax situation, and it's worth running the numbers.

How Does Having a Baby Change your HSA Contributions Limit?

If you're enrolled in a high-deductible health plan (HDHP), having a baby is the trigger to switch from individual HSA contribution limits to family limits — and the difference is significant.

For 2026, the HSA contribution limit for self-only coverage is $4,400, while family coverage allows contributions of up to $8,750. That's an additional $4,350 in pre-tax contributions the moment your child is added to your health plan.

HSAs are uniquely powerful because they offer a triple tax advantage: contributions go in pre-tax, growth is tax-free, and withdrawals for qualified medical expenses are tax-free. Unlike FSAs, there's no use-it-or-lose-it rule — the balance rolls over indefinitely, making it an effective long-term savings vehicle for future healthcare costs. For high earners who are able to afford paying out of pocket for health care expenses, there’s a huge long-term benefit to maxing out the contributions, investing the proceeds, and letting it grow until it’s time to retire.

If both spouses have family HDHP coverage, the family contribution limit is shared between them — they can divide the $8,750 however they choose, but cannot exceed that total between their two accounts. If each spouse has self-only coverage, each can contribute up to the individual limit of $4,400 to their own HSA.

One timing note: the moment your baby is added to your health plan — typically within 30 days of birth — your contribution limit steps up to the family amount for the full year, not just the remaining months. Confirm this with your plan administrator, but in most cases you can retroactively contribute the difference back to January 1st.

Should you Update your W-4 Withholdings After Having a Baby?

This is not something I’d recommend doing without the assistance of an accountant or tax professional, but if you work with a CPA or EA, it’s probably a good time to check in with him/her to run an updated tax projection. If a combination of the child tax credit, FSA or HAS contributions, and the dependent care tax credit are able to successfully reduce your tax bill, it may be worthwhile to adjust your paycheck withholdings down on your Form W-4 at work.

If your withholding doesn't reflect these new updates, you're giving the government an interest-free loan until you file. Adjusting your W-4 puts that money back in your paycheck immediately rather than waiting for a refund in April.