Can form 8332 be filed retroactively? For example can it be submitted in 2020 for release of claim of exemption in 2018?

[ee-ea · Accepted solution]

NO!

From form instructions:

Release of claim to exemption. Complete this form (or sign a similar statement containing the same information required by this form) and give it to the noncustodial parent. The noncustodial parent must attach this form or similar statement to his or her tax return each year the exemption is claimed. 

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