The Tax Cuts and Jobs Act flipped alimony’s tax treatment entirely for agreements executed after 2018 — the agreement date determines everything.
How it works
For agreements executed after December 31, 2018, alimony is neither deductible by the payer nor taxable to the recipient. For agreements from 2018 or earlier (unmodified), alimony remains fully deductible by the payer and fully taxable to the recipient.
What this does not include
A pre-2019 agreement can be modified to explicitly adopt the new post-2018 tax treatment — this calculator assumes an unmodified pre-2019 agreement retains the old rules, which isn’t automatic if the parties agreed otherwise.
How to use this calculator
- Enter the annual alimony amount and the agreement’s execution date category.
A worked example
$24,000 in annual alimony under an agreement dated after 2018 (post-TCJA): payer deduction = $0, recipient taxable income = $0 — alimony is now tax-neutral for both parties.
The same $24,000 under a pre-2019 agreement: payer deduction = $24,000, recipient taxable income = $24,000 — the old rules still apply to agreements grandfathered in before the law changed.
What the variables mean
| Variable | Meaning |
|---|---|
| Annual alimony | Total yearly alimony payment |
| Agreement date | Whether the divorce or separation agreement was executed before or after 2019 |
Edge cases worth knowing
The 2017 Tax Cuts and Jobs Act completely reversed the tax treatment of alimony for new agreements. Pre-2019 agreements let the payer deduct alimony and the recipient report it as income; post-2018 agreements have neither — a major difference that depends entirely on the agreement date, not the payment amount.
An unrecognized agreement date category makes the calculation impossible, since the tax treatment depends entirely on knowing which regime applies.
Frequently asked questions
Why did the tax treatment change so dramatically?
The 2017 Tax Cuts and Jobs Act eliminated the alimony deduction and income inclusion for new agreements, intended to raise revenue by taxing the higher-earning payer’s income rather than the (often lower-earning) recipient’s.
Does this affect child support too?
No — child support has never been deductible by the payer or taxable to the recipient, under either the old or new rules; only alimony (spousal support) was affected by this change.
What if a pre-2019 agreement is modified in 2026?
The parties can choose whether the modification explicitly adopts the new post-2018 rules; absent that explicit election, the original pre-2019 tax treatment generally continues to apply.
