For unmarried parents, usually only one parent is allowed to claim a child on their tax return, and who “should” claim them depends on both IRS eligibility rules and which option gives the best overall tax result for the family.

Core IRS rules

  • Only one person can claim the same child in a tax year; the child’s Social Security number can appear on just one tax return as a dependent.
  • If you and the other parent live together (cohabiting, not married, filing separate returns), you can generally choose which parent claims the child, as long as you both agree and only one of you actually does it.
  • If both of you try to claim the same child and the IRS has to break the tie, the child is treated as the dependent of:
    • The parent the child lived with the longest during the year, or
    • The parent with the higher adjusted gross income (AGI) if time lived with each is the same.

If you live together but aren’t married

When you’re an unmarried couple living together with your child:

  • You can agree that either parent claims the child, regardless of who has the higher income, as long as the child actually meets the “qualifying child” tests for that parent (age, relationship, residency, support).
  • The parent who claims the child typically gets:
    • Child Tax Credit
    • Earned Income Credit (if eligible)
    • Child and Dependent Care Credit (if you pay for childcare and qualify)
    • Possible Head of Household filing status, if that parent also paid more than half the cost of keeping up the home.

Because those benefits can be worth thousands of dollars, couples often run both scenarios (Parent A claims vs. Parent B claims) in tax software or with a professional and then pick the one that gives the highest combined refund or lowest total tax.

If you do not live together

If you’re unmarried and live apart, the IRS looks first at who is the “custodial parent” (where the child lived more nights):

  • By default, the custodial parent has the right to claim the child as a dependent.
  • If the child lived more nights with one parent, that parent usually wins any tie-breaker.
  • If the child spent exactly equal time with each parent, the tie-breaker goes to the parent with the higher AGI.
  • The custodial parent can sometimes let the noncustodial parent claim the dependency exemption/child tax credit by signing the proper IRS release form, but the custodial parent usually keeps things like Head of Household and Earned Income Credit.

Practical “who should claim” tips

Many unmarried parents decide who should claim the child based on:

  • Total tax savings:
    • Run both options (you claim vs. other parent claims).
    • Compare total refund/amount owed together, not just one person’s result.
  • Eligibility for key benefits:
    • If only one parent qualifies for Earned Income Credit due to income level, it often makes sense for that parent to claim the child.
* If only one parent can qualify for Head of Household because they can show they pay more than half of household costs, that’s another factor.
  • Risk of audit/conflict:
    • Never both claim the same child in the same year; that triggers IRS matching issues.
* Put your agreement in writing (even just a dated email or text) so everyone remembers who is claiming in which year.

Rule of thumb:

  • If you live together: choose the parent who produces the best combined tax result, but stick to that plan and make sure the other parent doesn’t enter the child at all.
  • If you live apart: the custodial parent usually has first claim, unless they formally release it to the other parent.

SEO notes for your post

  • Main focus keyword: who should claim child on taxes if unmarried (use naturally in title, introduction, and at least a few subheadings).
  • Supporting phrases to weave in: “unmarried parents,” “custodial parent,” “tie‑breaker rules,” “Head of Household,” and “Earned Income Credit.”
  • Keep paragraphs short and break out:
    • “If you live together but aren’t married”
    • “If you’re unmarried and live apart”
    • “How to decide who should claim”

You can close the post with a quick TL;DR like: “Only one unmarried parent can claim the child; if you live together you can choose, if you live apart the custodial parent usually has the right, and tie-breaker rules favor more nights or higher income.”

Information gathered from public forums or data available on the internet and portrayed here.