{"model":"step-up-vs-gift-now","specVersion":"1.0.0","specUrl":"/api/v1/models/step-up-vs-gift-now/spec","inputs":{"assetValue":{"kind":"float","min":10000,"max":50000000},"costBasis":{"kind":"float","min":0,"max":50000000},"annualAppreciationPct":{"kind":"float","min":0,"max":15},"yearsToTransfer":{"kind":"int","min":1,"max":40},"heirLtcgRatePct":{"kind":"float","min":0,"max":40}},"arrayInputs":{},"constraints":["costBasis ≤ assetValue (loss property's §1015 dual-basis rule is a spec exclusion)","annualAppreciationPct and heirLtcgRatePct are PERCENT points, not decimals"],"sentinels":[],"facts":[{"id":"irs.gift.annual-exclusion.2026","label":"Annual gift tax exclusion (per recipient)","value":19000,"period":"TY2026","source":"Rev. Proc. 2025-32, section .42(1)"}],"disclaimer":"Illustrative planning model, not financial advice. Outputs follow the published model spec exactly; read the spec for assumptions and exclusions before relying on any number."}