Audits for Determining Who is Eligible to Claim a Dependent

Tips for Avoiding and Resolving Your Tax Audit over Dependents

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Blended families are more the rule than the exception these days, and tax mistakes can happen when you're not currently married to your child's other parent. It's not at all uncommon for two taxpayers to claim the same dependent due to complex family circumstances.

You and your ex might both think you have custody of your child, but most years have 365 days so it's inevitable that she lives with one of you at least one more than she lives with the other. You and your sibling might both think you're entitled to claim your parent because you've been helping to support her, and sometimes an adult dependent might file his own tax return claiming his own personal exemption.

All these situations will catch the attention of the Internal Revenue Service, and the IRS has specific rules for determining who is eligible to claim a dependent. They're a bit complicated and they're multi-layered, but they make it pretty clear who qualifies as a dependent and which taxpayer is eligible to claim him.

The Effect of the Tax Cuts and Jobs Act

The Tax Cuts and Jobs Act (TCJA) eliminated personal exemptions from the tax code when it went into effect in January 2018. Taxpayers can no longer claim exemptions for each of their dependents, at least through 2025 when the TCJA potentially expires. This doesn't mean that claiming dependents won't offer a few nice tax breaks, however.

Several advantageous tax credits and a few deductions depend on having one or more dependents, so you can bet the IRS will continue to keep an eye out for multiple tax returns that claim the same ones, even while personal exemptions aren't an issue.

How Duplicate Social Security Numbers Are Detected

The IRS uses a computer system to accept and process tax returns, and the system screens for Social Security numbers that appear on more than one return. The IRS refers to this as a "duplicate taxpayer identification number" case. 

The second tax return to be filed using the Social Security number for a dependent that's already been claimed—or for someone claimed as a dependent who has also claimed a personal exemption for himself, which wasn't allowed, either, through 2017—will trigger a red flag from the computer. The second filer will receive an electronic-filing error message.

Not to worry...yet. The message is simply an early warning flag.

What to Do If You're Flagged

Go back over your tax return. Make sure you got your dependent's Social Security number right. You might have transposed numbers and inadvertently entered someone else's. This can happen even to married parents who have every legal right to claim their kids.

If the number is correct, reach out to anyone else who might have claimed your dependent as his own, such as your ex or a sibling who's been helping you support a family member. Find out if they've claimed your dependent.

If someone else has claimed your dependent, review the tax rules for doing so. The IRS publishes tiebreaker tests to help taxpayers determine who gets to claim a dependent. You might even want to touch base with a tax professional so you're sure you understand the complex rules and tests and you get it right.

Determining Who Can Claim the Dependent

It's typically only possible for one taxpayer to qualify to claim a certain dependent. For example, one rule is that a qualifying child dependent can only be claimed by the taxpayer with whom he lived for more than half the year. Obviously, this can't be both you and your ex if you don't live together.

An exception exists if the custodial parent has voluntarily given the dependent deduction to another taxpayer by providing a written release statement to the IRS on Form 8332. This sometimes happens in divorce situations. But otherwise, this rule is pretty concise.

Another rule states that the parent always has the first right to claim a child, so if the other taxpayer isn't his parent, this is pretty clear-cut as well. 

How the IRS Handles Audits Over Dependents

The IRS will first attempt to determine which taxpayer is not entitled to the dependent, and it will send an audit notice to that person. If the IRS can't determine which taxpayer isn't eligible, it will randomly select one of the tax returns for an audit or send notice to both taxpayers. If the first taxpayer successfully defends his tax return, the IRS will automatically audit the other tax return that claimed the same dependent.

Defending Your Tax Return in a Dependent Audit

Return your tax return to the IRS for further processing if you're sure you meet all the criteria to qualify to claim your dependent. You might also want to hire a tax professional. Only attorneys, certified public accountants, and enrolled agents are authorized to represent you in an audit with the IRS.

Be prepared to provide documentation to prove that you meet all the criteria to claim your dependent. You might have to prove your relationship to the individual, that your dependent is a citizen of the United States, Canada, or Mexico, or that the dependent did not provide more than half of his or her own financial support. The more documentation you have, the better.

Be prepared to provide school records or medical records that indicate that both you and your dependent lived at the same address for more than half a year, although this rule is waived for some qualifying relative dependents such as your parent. You can find a list of acceptable supporting documents in . 

You might also have to submit additional documentation to qualify for specific tax breaks, such as proof of child care expenses, medical expenses, or higher education expenses.

Most of these audit procedures will take place through the mail. The IRS will mail you a request for information, and you'll write back and send in copies of your supporting documents. 

What to Do If You Lose 

You can appeal the decision of the auditor, or you can take your case to  if you and the IRS can't come to an agreement about your dependents. But an ounce of prevention is always worth a pound of cure, so do your best to avoid getting tangled up in this sort of situation in the first place. Address the issue of who gets to claim a dependent before anyone files their tax returns. Talking this over with family members can go a long way toward preventing problems.

A Bigger Problem

It's also possible that you might have a much bigger problem on your hands if you can't identify anyone else who claimed your dependent. Your dependent's Social Security number might have been compromised. Someone unknown to you has used it to file a tax return in her name. Although the IRS has taken major steps against tax-related identity fraud in recent years, this problem is by no means eradicated.

Notify the IRS immediately if you suspect this is the case. You can find instructions for how to handle such a situation on the the , including filing a complaint with the Federal Trade Commission, notifying the major credit bureaus, and completing and submitting Form 14039 to the IRS. There should also be an IRS phone number you can call if you receive a notice that your dependent's Social Security number was used on another return.