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Methodology · Family Law

Family law methodology

Reviewed by · Last reviewed .

Not legal advice. Family law has high judicial discretion and state-by-state variance — outputs are estimates only. Real divorce, alimony, and property-division decisions require a licensed family-law attorney in your state.

Family law math beyond child support — alimony tax treatment, property-division math under IRC §1041, and the most common divorce-economics inputs. The child support model methodology is documented separately at Child Support & Custody methodology.

Alimony tax treatment — the TCJA 2017 split

Alimony tax treatment changed dramatically with the Tax Cuts and Jobs Act of 2017. There's now a hard split based on the date of the divorce or separation agreement:

Pre-2019 agreements (executed BEFORE 12/31/2018):
  Payer:    Deductible above-the-line per IRC §215
  Recipient: Taxable income per IRC §71
  Result: Income shifts from higher-bracket payer
          to lower-bracket recipient
          (joint tax savings vs no-alimony baseline)

Post-2018 agreements (executed ON or AFTER 1/1/2019):
  Payer:    NOT deductible
  Recipient: NOT taxable
  Result: Payer bears full tax cost; recipient receives
          gross amount without tax burden
          (no joint tax savings)

State tax conformity varies — most states followed
federal change but several still allow state-level
deduction under pre-TCJA rules.

Critical for divorce negotiations: a $5K/month alimony obligation under pre-2019 rules cost the payer significantly less after-tax than the same $5K/month obligation under post-2018 rules. Post-TCJA alimony amounts are typically negotiated lower than they would have been pre-TCJA, all else equal, because the payer's after-tax cost is now higher.

Property transfer non-recognition — IRC §1041

Per IRC §1041, transfers of property between spouses incident to divorce are treated as non-recognition events — no gain or loss recognized at the time of transfer. The receiving spouse takes the transferor's basis (carryover basis). Key implications:

  • Appreciated property: the deferred capital gain travels with the property. A house bought for $200K and worth $500K at divorce: the recipient takes a $200K basis. If they later sell for $500K, they recognize $300K gain (subject to §121 primary-residence exclusion if applicable).
  • Retirement accounts (401(k), IRA): generally NOT covered by §1041; require Qualified Domestic Relations Order (QDRO) for 401(k) per ERISA §206(d), or written transfer instruction for IRAs per IRC §408(d)(6). Done correctly, the transfer is also non-recognition.
  • Business interests: covered by §1041 for the transfer itself, but valuation disputes are intense. A business that one spouse runs and the other has no ownership interest in often becomes the largest single negotiation item in divorces involving operators.

Equitable distribution vs community property

Two major state systems for property division at divorce:

  • Equitable distribution (41 states + DC): courts divide marital property fairly but not necessarily equally. Factors: duration of marriage, age/health of parties, income, contributions to marriage, custody, future earning capacity. Judicial discretion is wide. Default rule is roughly 50/50 in practice but can deviate substantially.
  • Community property (9 states: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, Wisconsin — and Alaska as opt-in): marital property is presumed 50/50; separate property (pre-marital + gifts + inheritances received separately) stays with the original owner. Less judicial discretion at the division level.

The Bedrocka Tools calculators do not model property division directly — the math is so case-fact-specific that a calculator can't produce meaningful estimates without effectively replicating attorney case strategy. We document the tax treatment (above) but recommend licensed attorney consultation for division decisions.

Future scope: alimony estimator, business valuation for divorce, prenup financial impact

These are on the post-launch backlog. Family-law calculators benefit most from state-by-state guideline integration; the launch scope intentionally stays with child support (which has clear state-level formulas) before expanding into more discretion-heavy areas. Alimony estimators in particular vary so much by state and judge that a generic calculator produces low-confidence outputs without state-specific modeling.

Sources

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