Add the Georgia itemizer tax credit

changelog_entry.yaml

@@ -0,0 +1,4 @@
+- bump: minor
+  changes:
+    added:
+    - Georgia Itemizer Tax Credit.

policyengine_us/parameters/gov/states/ga/tax/income/credits/itemizer/amount.yaml

@@ -0,0 +1,13 @@
+description: Georgia provides this itemizer tax credit amount for resident taxpayers who itemize their deductions.
+values:
+  2021-01-01: 0
+  2024-01-01: 300
+metadata:
+  unit: currency-USD
+  period: year
+  label: Georgia itemizer tax credit amount
+  reference:
+    - title: Official Code of Georgia Annotated | O.C.G.A. § 48-7-29.23
+      href: https://law.justia.com/codes/georgia/2022/title-48/chapter-7/article-2/section-48-7-29-23/
+    - title: Official Code of Georgia Annotated | O.C.G.A. § 48-7-1 (Definition of Resident)
+      href: https://law.justia.com/codes/georgia/2022/title-48/chapter-7/article-1/section-48-7-1/

policyengine_us/parameters/gov/states/ga/tax/income/credits/non_refundable.yaml

@@ -7,10 +7,15 @@ values:
   2022-01-01:
     - ga_cdcc
     - ga_low_income_credit
+  2024-01-01:
+    - ga_cdcc
+    - ga_low_income_credit
+    - ga_itemizer_credit
   2026-01-01:
     - ga_cdcc
     - ga_low_income_credit
     - ga_ctc
+    - ga_itemizer_credit
 metadata:
   unit: list
   period: year
@@ -22,5 +27,9 @@ metadata:
     # Child and dependent care credit.
     - title: Official Code of Georgia Annotated |  O.C.G.A. § 48-7-29.10(b)
       href: https://law.justia.com/codes/georgia/2022/title-48/chapter-7/article-2/section-48-7-29-10/
+    # Itemizer credit.
+    - title: Official Code of Georgia Annotated | O.C.G.A. § 48-7-29.23
+      href: https://law.justia.com/codes/georgia/2022/title-48/chapter-7/article-2/section-48-7-29-23/
+    # Child tax credit.
     - title: House Bill 136 # Establishes the CTC for tax year 2026.
       href: https://legiscan.com/GA/text/HB136/id/3204611/Georgia-2025-HB136-Enrolled.pdf#page=2

policyengine_us/tests/policy/baseline/gov/states/ga/tax/income/credits/ga_itemizer_credit.yaml

@@ -0,0 +1,40 @@
+- name: Georgia itemizer credit - itemizer receives credit
+  period: 2024
+  input:
+    state_code: GA
+    tax_unit_itemizes: true
+  output:
+    ga_itemizer_credit: 300
+
+- name: Georgia itemizer credit - non-itemizer receives no credit
+  period: 2024
+  input:
+    state_code: GA
+    tax_unit_itemizes: false
+  output:
+    ga_itemizer_credit: 0
+
+- name: Georgia itemizer credit - not available before 2024
+  period: 2023
+  input:
+    state_code: GA
+    tax_unit_itemizes: true
+  output:
+    ga_itemizer_credit: 0
+
+- name: Georgia itemizer credit - available in 2025
+  period: 2025
+  input:
+    state_code: GA
+    tax_unit_itemizes: true
+  output:
+    ga_itemizer_credit: 300
+
+- name: Georgia itemizer credit - high income itemizer receives credit
+  period: 2024
+  input:
+    state_code: GA
+    adjusted_gross_income: 100_000
+    tax_unit_itemizes: true
+  output:
+    ga_itemizer_credit: 300

policyengine_us/variables/gov/states/ga/tax/income/credits/ga_itemizer_credit.py

@@ -0,0 +1,23 @@
+from policyengine_us.model_api import *
+
+
+class ga_itemizer_credit(Variable):
+    value_type = float
+    entity = TaxUnit
+    label = "Georgia itemizer tax credit"
+    unit = USD
+    definition_period = YEAR
+    reference = (
+        "https://law.justia.com/codes/georgia/2022/title-48/chapter-7/article-2/section-48-7-29-23/",
+        # Definition of resident
+        "https://law.justia.com/codes/georgia/2022/title-48/chapter-7/article-1/section-48-7-1/",
+    )
+    defined_for = StateCode.GA
+
+    def formula(tax_unit, period, parameters):
+        # Full-year and part-year residents who itemize their deductions
+        # are entitled to a credit up to $300 per taxpayer
+        itemizes = tax_unit("tax_unit_itemizes", period)
+        p = parameters(period).gov.states.ga.tax.income.credits.itemizer
+        amount = p.amount
+        return where(itemizes, amount, 0)