Add Washington millionaires tax to baseline (ESSB 6346)

changelog.d/wa-millionaires-tax.added.md

@@ -0,0 +1 @@
+Add Washington millionaires tax (9.9% on income above $1M) and WFTC age expansion (18+) per ESSB 6346. Removes contributed reform since bill is now law.

policyengine_us/parameters/gov/states/wa/tax/income/credits/working_families_tax_credit/age_expansion/in_effect.yaml

@@ -0,0 +1,13 @@
+description: Washington uses this indicator to determine whether the Working Families Tax Credit age expansion applies.
+values:
+  2000-01-01: false
+  2029-01-01: true
+metadata:
+  unit: bool
+  period: year
+  label: Washington WFTC age expansion in effect
+  reference:
+    - title: ESSB 6346, Sec. 901 - Working Families Tax Credit expansion
+      href: https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Senate%20Passed%20Legislature/6346-S.PL.pdf#page=61
+    - title: ESSB 6346, Sec. 1205(1) - Effective date
+      href: https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Senate%20Passed%20Legislature/6346-S.PL.pdf#page=110

policyengine_us/parameters/gov/states/wa/tax/income/credits/working_families_tax_credit/age_expansion/min_age.yaml

@@ -0,0 +1,11 @@
+description: Washington sets this age as the minimum for eligibility under the Working Families Tax Credit age expansion.
+values:
+  2000-01-01: 0
+  2029-01-01: 18
+metadata:
+  unit: year
+  period: year
+  label: Washington WFTC minimum age for expansion
+  reference:
+    - title: ESSB 6346, Sec. 901(2)(a)(ii)(D) - Age requirement
+      href: https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Senate%20Passed%20Legislature/6346-S.PL.pdf#page=61

policyengine_us/parameters/gov/states/wa/tax/income/millionaires_tax/deductions/charitable/cap.yaml

@@ -0,0 +1,10 @@
+description: Washington limits charitable deductions to this amount under the millionaires tax.
+values:
+  2028-01-01: 100_000
+metadata:
+  unit: currency-USD
+  period: year
+  label: Washington millionaires tax charitable deduction cap
+  reference:
+    - title: ESSB 6346, Sec. 309(1) - Charitable contributions
+      href: https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Senate%20Passed%20Legislature/6346-S.PL.pdf#page=14

policyengine_us/parameters/gov/states/wa/tax/income/millionaires_tax/deductions/standard.yaml

@@ -0,0 +1,19 @@
+description: Washington deducts this amount as the standard deduction under the millionaires tax.
+values:
+  2028-01-01: 1_000_000
+metadata:
+  unit: currency-USD
+  period: year
+  label: Washington millionaires tax standard deduction
+  uprating: gov.bls.cpi.cpi_u
+  # Sec. 316 specifies Seattle-area CPI-U for indexing starting Oct 2029
+  # (for tax year 2030). Using national CPI-U as a proxy until we add
+  # Seattle-area CPI data. Fixed at $1M for 2028-2029.
+  rounding:
+    type: nearest
+    interval: 1_000
+  reference:
+    - title: ESSB 6346, Sec. 314 - One million dollar standard deduction
+      href: https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Senate%20Passed%20Legislature/6346-S.PL.pdf#page=15
+    - title: ESSB 6346, Sec. 316(1) - Index for inflation
+      href: https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Senate%20Passed%20Legislature/6346-S.PL.pdf#page=15

policyengine_us/parameters/gov/states/wa/tax/income/millionaires_tax/in_effect.yaml

@@ -0,0 +1,11 @@
+description: Washington applies the millionaires tax if this is true.
+values:
+  2000-01-01: false
+  2028-01-01: true
+metadata:
+  unit: bool
+  period: year
+  label: Washington millionaires tax in effect
+  reference:
+    - title: ESSB 6346, Sec. 201(1) - Tax Imposed
+      href: https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Senate%20Passed%20Legislature/6346-S.PL.pdf#page=8

policyengine_us/parameters/gov/states/wa/tax/income/millionaires_tax/rate.yaml

@@ -0,0 +1,10 @@
+description: Washington taxes income at this rate under the millionaires tax.
+values:
+  2028-01-01: 0.099
+metadata:
+  unit: /1
+  period: year
+  label: Washington millionaires tax rate
+  reference:
+    - title: ESSB 6346, Sec. 201(1) - Tax Imposed
+      href: https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Senate%20Passed%20Legislature/6346-S.PL.pdf#page=8

policyengine_us/reforms/reforms.py

@@ -184,9 +184,6 @@
 from .congress.watca import (
     create_watca_reform,
 )
-from .states.wa.sb6346.sb6346 import (
-    create_wa_sb6346_reform,
-)
 
 
 from .states.ga.sb520 import (
@@ -411,7 +408,6 @@ def create_structural_reforms_from_parameters(parameters, period):
     nc_eitc = create_nc_eitc_reform(parameters, period)
     mi_ctc = create_mi_ctc_reform(parameters, period)
     watca = create_watca_reform(parameters, period)
-    wa_sb6346 = create_wa_sb6346_reform(parameters, period)
     al_eitc = create_al_eitc_reform(parameters, period)
     ar_eitc = create_ar_eitc_reform(parameters, period)
     az_eitc = create_az_eitc_reform(parameters, period)
@@ -516,7 +512,6 @@ def create_structural_reforms_from_parameters(parameters, period):
         nc_eitc,
         mi_ctc,
         watca,
-        wa_sb6346,
         al_eitc,
         ar_eitc,
         az_eitc,