Nunavut Age Amount Credit

changelog_entry.yaml

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+- bump: minor
+  changes:
+    added:
+    - Nunavut age amount credit.

policyengine_canada/parameters/gov/provinces/nu/tax/income/credits/age_amount/amount.yaml

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+description: Nunavut provides this maximum age amount credit for eligible filers.
+values:
+  2022-07-01: 10_764
+metadata:
+  unit: currency-CAD
+  label: Nunavut age amount credit maximum amount
+  reference:
+  - title: Consolidation of Income Tax Act, Part I Division B Subdivision c 2.2
+    href: https://www.nunavutlegislation.ca/en/consolidated-law/income-tax-act-consolidation
+  - title: Worksheet NU428 
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/5014-d/5014-d-22e.pdf#page=1
+

policyengine_canada/parameters/gov/provinces/nu/tax/income/credits/age_amount/eligible_age.yaml

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+description: Nunavut allow filers at or over this age to receive the age amount credit. 
+values:
+  2002-01-01: 65
+metadata:
+  unit: year
+  label: Nunavut age amount credit eligible age
+  reference:
+  - title: Consolidation of Income Tax Act, Part I Division B Subdivision c 2.2
+    href: https://www.nunavutlegislation.ca/en/consolidated-law/income-tax-act-consolidation

policyengine_canada/parameters/gov/provinces/nu/tax/income/credits/age_amount/phase_out_rate.yaml

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+description: Nunavut phases the age amount credit out at this rate, based on income.
+brackets:
+  - threshold: 
+      2022-07-01: 0
+    rate:
+      2022-07-01: 0
+  - threshold:
+      2022-07-01: 39_826
+    rate:
+      2022-07-01: 0.15
+
+metadata:
+  type: marginal_rate
+  rate_unit: /1
+  threshold_unit: currency-CAD
+  label: Nunavut age amount credit reduction rate
+  reference:
+  - title: Consolidation of Income Tax Act, Part I Division B Subdivision c 2.2
+    href: https://www.nunavutlegislation.ca/en/consolidated-law/income-tax-act-consolidation
+

policyengine_canada/tests/gov/provinces/nu/tax/income/credits/age_amount/nu_age_amount_credit.yaml

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+- name: Under threshold with eligible age
+  period: 2023
+  input:
+    province_code: NU
+    total_individual_pre_tax_income: 0
+    age: 65
+  output:
+    nu_age_amount_credit: 10_764
+
+- name: Over threshold income with eligible age
+  period: 2023
+  input:
+    province_code: NU
+    total_individual_pre_tax_income: 69_826
+    age: 65
+  output: 
+    nu_age_amount_credit: 6_264
+
+- name: Max out credit with eligible age
+  period: 2023
+  absolute_error_margin: 0.5
+  input:
+    province_code: NU
+    total_individual_pre_tax_income: 111_586
+    age: 65
+  output: 
+    nu_age_amount_credit: 0
+
+
+- name: Under threshold with ineligible age
+  period: 2023
+  input:
+    province_code: NU
+    total_individual_pre_tax_income: 0
+    age: 20
+  output:
+    nu_age_amount_credit: 0
+
+- name: Over threshold income with ineligible age
+  period: 2023
+  input:
+    province_code: NU
+    total_individual_pre_tax_income: 69_826
+    age: 20
+  output: 
+    nu_age_amount_credit: 0

policyengine_canada/tests/gov/provinces/nu/tax/income/credits/age_amount/nu_age_amount_credit_eligible_person.yaml

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+- name: Eligible
+  period: 2023
+  input:
+    province_code: NU
+    age: 65
+  output:
+    nu_age_amount_credit_eligible_person: true
+
+- name: Ineligible
+  period: 2023
+  input:
+    province_code: NU
+    age: 60
+  output:
+    nu_age_amount_credit_eligible_person: false

policyengine_canada/variables/gov/provinces/nu/tax/income/credits/age_amount/nu_age_amount_credit.py

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+from policyengine_canada.model_api import *
+
+
+class nu_age_amount_credit(Variable):
+    value_type = float
+    entity = Person
+    label = "Nunavut age amount credit"
+    unit = CAD
+    definition_period = YEAR
+    defined_for = "nu_age_amount_credit_eligible"
+
+    def formula(person, period, parameters):
+        income = person("total_individual_pre_tax_income", period)
+        p = parameters(period).gov.provinces.nu.tax.income.credits.age_amount
+        phase_out_amount = p.phase_out_rate.calc(income)
+        return max_(p.amount - phase_out_amount, 0)

policyengine_canada/variables/gov/provinces/nu/tax/income/credits/age_amount/nu_age_amount_credit_eligible_person.py

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+from policyengine_canada.model_api import *
+
+
+class nu_age_amount_credit_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = "Eligible for the Nunavut age amount credit"
+    definition_period = YEAR
+    defined_for = ProvinceCode.NU
+
+    def formula(person, period, parameters):
+        age = person("age", period)
+        p = parameters(
+                period
+            ).gov.provinces.nu.tax.income.credits.age_amount
+        return age >= p.eligible_age