Could you be missing important tax dates? Here are tax milestone birthdays to know.

Tax milestones
Tax milestones

First birthday, sweet 16th, voting age, retirement. You experience many milestones as you age, but those passages also mark key moments in your tax life.

From birth to late in life, your birthday could trigger a change in tax status.

On some birthdays, you may age out of a tax credit or age into one. On others, you may be required to take money out of retirement accounts.

We've compiled a list of key birthdays that affect your tax status. Make a note of them. It’ll help you maximize your returns and avoid penalties.

Significant tax birthdays, sorted by decade

Even if your baby is born on Dec. 31, they are considered a dependent for the full year and eligible for the Child Tax Credit.

Age 12: This is the last year your child will be eligible for the Dependent Care Credit (the age limit doesn't apply if the dependent child is physically or mentally incapable of self-care).

Age 16: This is the last year a child is eligible for the Child Tax Credit.

Age 17: Dependent children are no longer eligible for the Child Tax Credit but may be eligible for the Other Dependent Credit.

The last year you can set up Coverdell Education Savings Accounts contributions for most children. Beneficiaries must be under 18  or be a special-needs beneficiary when it's created.

Age 18: The last year a child can qualify as a dependent if the child is younger than the taxpayer claiming the exemption. The child must be under age 19 at year's end, unless the dependent is a full-time student. If the dependent is a student, the dependent must be under 24 at the end of the year. People who are permanently and totally disabled at any time during the year, regardless of age, can be claimed as dependents.

Age 23: The maximum age that the “kiddie tax” applies to dependent full-time students. The “kiddie tax” imposes higher taxes on investment income of children to circumvent parents passing on investments to their kids who may be in lower tax brackets.

Age 24: A child who is a full-time student and younger than the claiming taxpayer ages out as a qualified dependent.

Age 30: Any remaining money in Coverdell Education Savings Accounts must be distributed within 30 days after the designated beneficiary’s 30th birthday unless the beneficiary is a special-needs beneficiary. If you miss this, your distribution will be subject to a 10% tax.

Age 50: “Catch-up” contributions to retirement plans are allowed. The 2024 catch-up contribution limit for employees ages 50 and over who participate in 401(k), 403(b), most 457 plans, and the federal government’s Thrift Savings Plan is $7,500 (up from $6,500 in 2023). For individual retirement accounts (IRAs), the catch-up is still $1,000.