{"model":"charitable-bunching","specVersion":"1.0.0","specUrl":"/api/v1/models/charitable-bunching/spec","inputs":{"filingStatus":{"kind":"choice","values":["single","married"]},"agi":{"kind":"float","min":30000,"max":1500000},"iraDistributions":{"kind":"float","min":0,"max":300000},"age":{"kind":"int","min":50,"max":95},"annualGiving":{"kind":"float","min":0,"max":150000},"otherItemizedDeductions":{"kind":"float","min":0,"max":100000},"bunchYears":{"kind":"int","min":2,"max":5}},"arrayInputs":{},"constraints":["agi is each year's AGI before any QCD and includes iraDistributions (values above agi are read as agi). Whole-year ages: QCD eligibility modeled at 71+. Cash gifts above the 60% AGI limit are reported, not carried forward (spec exclusions)."],"sentinels":[],"facts":[{"id":"irs.standard-deduction.single.2026","label":"Standard deduction, single filer","value":16100,"period":"TY2026","source":"IRS TY2026 announcements (Notice 2025-67; Rev. Proc. 2025-32 newsroom page)"},{"id":"irs.standard-deduction.mfj.2026","label":"Standard deduction, married filing jointly","value":32200,"period":"TY2026","source":"IRS TY2026 announcements (Notice 2025-67; Rev. Proc. 2025-32 newsroom page)"},{"id":"irs.charitable.nonitemizer-cap.single.2026","label":"Charitable deduction for non-itemizers, cash gifts cap (§170(p)), single","value":1000,"period":"TY2026","source":"Public Law 119-21 (One Big Beautiful Bill Act) (§70424); IRS One Big Beautiful Bill provisions page"},{"id":"irs.charitable.nonitemizer-cap.mfj.2026","label":"Charitable deduction for non-itemizers, cash gifts cap (§170(p)), joint return","value":2000,"period":"TY2026","source":"Public Law 119-21 (One Big Beautiful Bill Act) (§70424); IRS One Big Beautiful Bill provisions page"},{"id":"irs.charitable.agi-floor.2026","label":"Floor on itemized charitable deductions, share of contribution base (§170(b)(1)(I))","value":0.005,"period":"TY2026 onward","source":"Public Law 119-21 (One Big Beautiful Bill Act) (§70425)"},{"id":"irs.charitable.cash-agi-limit.2026","label":"Limit on cash gifts to public charities, share of contribution base (§170(b)(1)(G)(i))","value":0.6,"period":"TY2026 onward","source":"Public Law 119-21 (One Big Beautiful Bill Act) (§70425(b)), as codified at 26 U.S.C. 170(b)(1)(G)(i)"},{"id":"irs.itemized.benefit-limit-fraction.2026","label":"Reduction of itemized deductions for the 37% bracket (§68(a)), fraction","value":0.05405405405405406,"period":"TY2026 onward","source":"Public Law 119-21 (One Big Beautiful Bill Act) (§70111)"},{"id":"irs.qcd.annual-limit.2026","label":"Qualified charitable distribution annual limit (§408(d)(8)(A))","value":111000,"period":"TY2026","source":"IRS Notice 2025-67 (2026 retirement plan COLAs)"}],"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."}