2021?
If you did not already provide a 8332 with part II filled out, then if you are letting him claim for the 2020 tax year (filed in 2021), you just provide a 8332 form with part I filled out which will release for the 2020 tax year only.
If you want to use part II to release in future years then per the 8332 instructions:
Part I. Complete Part I to release a claim to exemption for your child for the current tax year.
Part II. Complete Part II to release a claim to exemption for your child for one or more future years. Write the specific future year(s) or “all future years” in the space provided in Part II.
To help ensure future support, you may not want to release your claim to the exemption for the child for future years.
If every other year you can also specify "all future even tax years" (or "odd" tax years as the case may be).
https://www.irs.gov/pub/irs-pdf/f8332.pdf
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
