Alimony After-Tax Present Value Calculator

The tax treatment of alimony depends entirely on when your divorce was finalized. Under pre-2019 rules, alimony is deductible to the payer and taxable income to the recipient. Under post-TCJA rules (divorces finalized after 12/31/2018), there is no tax effect for either party. Same nominal dollars — completely different after-tax reality. This calculator models both regimes.

Pre-2019 vs post-2018: two completely different tax regimes

The Tax Cuts and Jobs Act (§ 11051) repealed IRC §§ 71 and 215 for divorces executed after 12/31/2018:¹

Rule	Pre-2019 divorce	Post-2018 divorce
Deductible to payer?	Yes — above-the-line (former IRC § 215)	No
Taxable to recipient?	Yes — ordinary income (former IRC § 71)	No
Where does the tax sit?	Splits between parties based on bracket difference	Entirely with the payer (no deduction offsets cost)
Settlement dynamic	Bracket arbitrage possible — higher-bracket payer benefits from deduction more than lower-bracket recipient loses to tax	No arbitrage — payer bears full nominal cost

Why the same dollar amount means different things

Take a payer in the 32% bracket and a recipient in the 22% bracket, $4,000/month for 7 years ($336,000 nominal):

Pre-2019: Payer saves $107,520 in taxes (32% deduction). Recipient pays $73,920 in income tax (22% inclusion). Payer's net cost: $228,480. Recipient's net take-home: $262,080. The 10-point bracket spread creates a $33,600 tax benefit that can be negotiated between the parties.
Post-2018: Payer pays the full $336,000 — no deduction. Recipient keeps the full $336,000 — no income tax due. The recipient is actually better off dollar-for-dollar in a post-TCJA divorce; the payer is worse off.

Negotiation implication. Under post-TCJA rules, a lower nominal alimony amount can be worth the same after-tax to a recipient as a higher pre-TCJA amount. Neither party should negotiate based on nominal dollars without adjusting for the applicable tax regime.

The modification trap

Modifying a pre-2019 decree does not automatically preserve old-rules treatment. If a modification changes the amount or duration and fails to explicitly state that the old tax rules continue to apply, the IRS position is that the modification can pull the entire stream into post-TCJA treatment — eliminating the payer's deduction retroactively on the modified agreement.² Never modify a pre-2019 alimony order without coordinated attorney and CPA review.

What the discount rate does

A dollar of alimony paid in year 7 is worth less than a dollar today. Net present value (NPV) converts future cash flows into a today-equivalent. This matters when:

Negotiating a lump-sum buyout in lieu of the payment stream
Comparing front-loaded vs back-loaded schedules
Accounting for payment risk — if the payer loses income or dies, payments may stop

The default 3% approximates inflation. A higher rate (5–7%) reflects greater time preference or payment uncertainty. The NPV output is the minimum floor for a fair lump-sum offer — before further adjustments for investment return assumptions and tax treatment of any lump-sum structured as a property settlement vs alimony.

2026 tax bracket reference

For single filers in 2026 (IRS Rev. Proc. 2025-32):³

Rate	Single filer taxable income
10%	$0 – $12,400
12%	$12,400 – $50,400
22%	$50,400 – $105,700
24%	$105,700 – $201,775
32%	$201,775 – $256,225
35%	$256,225 – $640,600
37%	Over $640,600

Standard deduction 2026: $16,100 single / $32,200 MFJ / $24,150 head of household. The calculator uses your stated marginal rate directly — enter your effective marginal rate after accounting for your full income picture.

Sources

Tax brackets and standard deductions verified against IRS Rev. Proc. 2025-32 (April 2026). Alimony tax treatment governed by TCJA § 11051 for divorces finalized after 12/31/2018. Calculator output is directional — not legal or tax advice. Consult a CDFA and CPA for your specific situation.

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