Merge pull request #289 from zqw5219/zqw5219/issue288

Northwest Territories Age Credit

changelog_entry.yaml

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+- bump: minor
+  changes:
+    added:
+    - Northwest Territories Age Credit.

policyengine_canada/parameters/gov/provinces/nt/tax/income/credits/age_credit/age_eligibility.yaml

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+description: Northwest Territories provides the age credit to filers at or above this age threshold.
+
+values:
+  2022-01-01: 65
+metadata:
+  unit: year
+  label: Northwest Territories age credit age eligibility
+  reference: 
+  - title: Income Tax Act - Section 2.2 Age Credit 
+    href: https://www.justice.gov.nt.ca/en/files/legislation/income-tax/income-tax.a.pdf#page=31
+  - title: 2022 Worksheet NT428 - line 58080
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/5012-d/5012-d-22e.pdf#page=1
+  - title: 2023 Personal Tax Credits Return - line 2 Age amount
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/td1nt-ws/td1nt-ws-23e.pdf#page=1

policyengine_canada/parameters/gov/provinces/nt/tax/income/credits/age_credit/max_amount.yaml

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+description: Northwest Territories provides this maximum amount under the age credit.
+values:
+  # Amount increases with inflation every year
+  2022-01-01: 7_635
+  2023-01-01: 8_116
+metadata:
+  unit: currency-CAD
+  label: Northwest Territories age credit maximum amount
+  reference:
+  - title: Income Tax Act - Section 2.2 Age Credit
+    href: https://www.justice.gov.nt.ca/en/files/legislation/income-tax/income-tax.a.pdf#page=31
+  - title: 2022 Worksheet NT428 - line 58080
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/5012-d/5012-d-22e.pdf#page=1
+  - title: 2023 Personal Tax Credits Return - line 2 Age amount
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/td1nt-ws/td1nt-ws-23e.pdf#page=1

policyengine_canada/parameters/gov/provinces/nt/tax/income/credits/age_credit/reduction.yaml

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+description: Northwest Territories phases the age credit out at this rate based on the filer's income. 
+brackets:
+  - threshold:
+      2022-01-01: 0
+    rate:
+      2022-01-01: 0
+  - threshold:
+      2022-01-01: 39_826
+      2023-01-01: 42_335
+    rate:
+      2022-01-01: 0.15
+metadata:
+  type: marginal_rate
+  threshold_unit: currency-CAD
+  rate_unit: /1
+  label: Northwest Territories Age Credit phase out rate
+  reference:
+  - title: Income Tax Act - Section 2.2 Age Credit 
+    href: https://www.justice.gov.nt.ca/en/files/legislation/income-tax/income-tax.a.pdf#page=31
+  - title: 2022 Worksheet NT428 - line 58080
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/5012-d/5012-d-22e.pdf#page=1
+  - title: 2023 Personal Tax Credits Return - line 2 Age amount
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/td1nt-ws/td1nt-ws-23e.pdf#page=1

policyengine_canada/tests/gov/provinces/nt/tax/income/nt_age_credit.yaml

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+- name: Under taxable income 2022
+  period: 2022
+  input:
+    province_code: NT
+    nt_age_credit_eligible: true
+    nt_taxable_income: 39_825
+  output:
+    nt_age_credit: 7_635
+
+- name: Calculation 2022 # 7,635 - ((40,100 - 39,826) * 0.15)
+  period: 2022
+  input:
+    province_code: NT
+    nt_age_credit_eligible: true
+    nt_taxable_income: 40_100
+  output:
+    nt_age_credit: 7_593.9
+
+- name: Under taxable income 2023
+  period: 2023
+  input:
+    province_code: NT
+    nt_age_credit_eligible: true
+    nt_taxable_income: 42_334
+  output:
+    nt_age_credit: 8_116
+
+- name: Calculation 2023 # 8_116 - ((45_000 - 42_335) * 0.15)
+  period: 2023
+  input:
+    province_code: NT
+    nt_age_credit_eligible: true
+    nt_taxable_income: 45_000
+  output:
+    nt_age_credit: 7_716.25

policyengine_canada/tests/gov/provinces/nt/tax/income/nt_age_credit_eligible.yaml

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+- name: Under age amount 2022
+  period: 2022
+  input:
+    province_code: NT
+    age: 64
+  output:
+    nt_age_credit_eligible: false
+
+- name: 65 years old 2022
+  period: 2022
+  input:
+    province_code: NT
+    age: 65
+  output:
+    nt_age_credit_eligible: true
+
+- name: Above age amount 2022
+  period: 2022
+  input:
+    province_code: NT
+    age: 66
+  output:
+    nt_age_credit_eligible: true
+
+- name: Under age amount 2023
+  period: 2023
+  input:
+    province_code: NT
+    age: 64
+  output:
+    nt_age_credit_eligible: false
+
+- name: 65 years old 2022
+  period: 2022
+  input:
+    province_code: NT
+    age: 65
+  output:
+    nt_age_credit_eligible: true
+
+- name: Above age amount 2023
+  period: 2023
+  input:
+    province_code: NT
+    age: 66
+  output:
+    nt_age_credit_eligible: true

policyengine_canada/variables/gov/provinces/nt/tax/income/credits/age_credit/nt_age_credit.py

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+from policyengine_canada.model_api import *
+
+
+class nt_age_credit(Variable):
+    value_type = float
+    entity = Person
+    label = "Northwest Territories age credit"
+    unit = CAD
+    definition_period = YEAR
+    defined_for = "nt_age_credit_eligible"
+    reference = "https://www.justice.gov.nt.ca/en/files/legislation/income-tax/income-tax.a.pdf#page=31"
+
+    def formula(person, period, parameters):
+        p = parameters(period).gov.provinces.nt.tax.income.credits.age_credit
+        income = person("nt_taxable_income", period)
+        return max_(p.max_amount - p.reduction.calc(income), 0)

policyengine_canada/variables/gov/provinces/nt/tax/income/credits/age_credit/nt_age_credit_eligible.py

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+from policyengine_canada.model_api import *
+
+
+class nt_age_credit_eligible(Variable):
+    value_type = bool
+    entity = Person
+    label = "Northwest Territories age credit eligibility"
+    definition_period = YEAR
+    defined_for = ProvinceCode.NT
+    reference = "https://www.justice.gov.nt.ca/en/files/legislation/income-tax/income-tax.a.pdf#page=31"
+
+    def formula(person, period, parameters):
+        p = parameters(period).gov.provinces.nt.tax.income.credits.age_credit
+        age = person("age", period)
+        return age >= p.age_eligibility