Updated July 28, 2026. Quick answer: It does not. The effective-date rule preserves the old deductible-and-includible treatment on a pre-2019 instrument even after a post-2018 modification — unless the modification “expressly provides” that the repeal applies to it. Modification by itself does nothing. This is the most misstated fact in divorce tax, and it points in the opposite direction from the common warning.
What the effective-date rule actually says
The repeal of the alimony deduction applies to instruments “executed after Dec. 31, 2018, and to such instruments executed on or before Dec. 31, 2018, and modified after Dec. 31, 2018, if the modification expressly provides that the amendment … applies to such modification.”
| Your instrument | Alimony treatment |
|---|---|
| Executed after 31 Dec 2018 | Not deductible, not includible |
| Executed before, never modified | Old rules — deductible |
| Executed before, modified after, silent on the amendment | Old rules survive |
| Executed before, modified after, modification expressly opts in | New rules apply |
So the opt-in is a choice, and it is occasionally the right one. If the payer’s bracket has fallen below the recipient’s, the old treatment is no longer advantageous to the household and electing into the new rules can be worth doing deliberately. But it has to be written into the modification — it does not happen by accident, and it cannot be undone by accident either.
The practical warning runs the other way from the usual one. The risk is not that modifying kills your deduction. It is that a modification drafted by someone who believes the myth may include opt-in language as a precaution — and thereby destroy a deduction that would otherwise have survived. Read the modification for that sentence before signing it.
Sources
IRC §1041(a), (b), (c) and Temp. Reg. §1.1041-1T(b) Q&A-7; §414(p); §72(t)(2)(C) and §72(t)(3)(A); §408(d)(6); §121(a), (b), (d)(3); §7703(a) and (b); §152(e); §2(b)(1)(A)(i); §32(c)(3)(A); §21(e)(5); the repeal of §§71 and 215 by Pub. L. 115-97 §11051 and its effective-date note; IRS Form 8332 (current revision). All read July 2026.
This states what the cited authority says. It is not tax advice, and retirement-plan design turns on facts about your business and your other entities that no page can see. Every dollar limit referenced here is indexed and changes annually.