How to Prove a Grandchild Lives With You for Taxes

To claim a grandchild as a qualifying child, the IRS requires that the child lived in your home for more than half the tax year — at least 183 nights in a 365-day year or 184 nights in a leap year. If the IRS questions your return, you will need documents that prove it. A verbal statement from the child's parent or a signed letter is not enough.

What the IRS Accepts as Proof

The IRS audit division looks for official records from independent third parties that show the child's address as your home. The strongest evidence falls into three categories:

School records. Enrollment documents, report cards, and attendance records that list your address as the student's home address. Request these from the school office — they typically show the address on file at the start of each semester.

Medical and dental records. Pediatrician visit records, immunization records, or dental appointment records that list your address. Your grandchild's healthcare provider can print a patient summary showing the address of record and visit dates.

Official mail. Letters from government agencies (Social Security Administration, state benefits offices, school district notices) addressed to the child at your home. Save the envelopes — the postmark and address are the evidence.

Supporting Documentation

Beyond the three primary categories, corroborating records strengthen your case:

• Daycare or after-school program enrollment records
• Religious institution records (baptism, enrollment in religious education)
• Landlord or property management letters confirming the child as a household member
• State social service caseworker logs documenting home visits
• Utility bills showing consistent occupancy patterns

Temporary Absences Still Count

The child does not need to be physically in your home every single night. The IRS counts temporary absences as time at home when the child is away for:

• School (including boarding school or college housing)
• Medical treatment or hospitalization
• Vacation
• Detention in a juvenile facility

If your grandchild spent the summer at camp or was hospitalized for two weeks, those nights may still count toward the more-than-half-the-year threshold if the absence was temporary and your home remained the child's principal place of abode.

Keep a Simple Overnight Log

The single most effective tool for proving residency is a simple calendar where you mark each night the child sleeps in your home. It does not need to be fancy — a wall calendar with checkmarks works. What matters is that you fill it in as the year goes along rather than trying to reconstruct it at tax time.

Note any nights the child is away and why (hospital stay, visit to parent, school trip). This contemporaneous record carries more weight with the IRS than a calendar filled in from memory months later.

What Happens During an Audit

If the IRS asks for supporting documents — for example, in a CP75 or CP75A notice — follow the response date and instructions in the letter. Organize your documents in advance: birth certificate, school records, medical records, and your overnight log, each with a cover page summarizing what it proves.

Do not panic. The IRS may review EITC or CTC claims and request supporting records. If it does, timely documents that support your eligibility will help you respond.

Build Your Record Now

Our US Kinship Tax Guide includes a printable 12-month residency log and an audit-response organizer that structures your documentation into the categories the IRS asks for — so you are ready whether or not you ever receive that letter.

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