Fill out Form 2120 (Multiple Support Declaration) online
Form 2120 is used when two or more people together provide more than half of a person's support, but no single person provides more than half. The form allows the group to designate which eligible member will claim the dependent exemption for that tax year.
How to fill out Form 2120 (Multiple Support Declaration)
Identify the supported person
Enter the name and Social Security number of the person for whom the multiple support agreement is being made. This is the individual whose support is shared among the group.
List all contributing members
Identify each person who contributed more than 10% of the supported person's total support during the calendar year. Record each contributor's name, address, and Social Security number.
Designate the claiming taxpayer
The group must agree on which eligible member will claim the dependent for the tax year. The designated person must have contributed more than 10% of the supported person's total support.
Obtain signed declarations and attach to return
Each contributing member who is waiving their right to claim the dependent must sign a written declaration. Attach Form 2120 along with all signed declarations to the claiming taxpayer's Form 1040.
About Form 2120 (Multiple Support Declaration)
Who needs this form
Taxpayers who are part of a group of individuals collectively providing more than 50% of another person's support, where no single member provides more than 50%. Each member who contributed more than 10% of the support must sign this form to release their claim so that one designated person can claim the dependent.
Where to submit
The taxpayer claiming the dependent attaches Form 2120 to their Form 1040 or 1040-SR. Each person who contributed more than 10% and is waiving their right to claim the dependent must sign a separate written declaration (or Form 2120).
Source and content freshness
- Reviewed: 2026-02-24
- Filing deadlines may shift for weekends and holidays. Verify due dates with official instructions.
Common mistakes to avoid
- Not obtaining signed declarations from all contributing members who provided more than 10% of the person's support
- Claiming the dependent without meeting the requirement that the claiming taxpayer provided more than 10% of support
- Failing to verify that the total support from the group exceeds 50% of the dependent's total support
- Not attaching the form and all required declarations to the tax return
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