Nova Scotia Basic personal amount

changelog_entry.yaml

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+- bump: minor
+  changes:
+    added:
+    - Nova Scotia Basic Personal Amount.
+

policyengine_canada/parameters/gov/provinces/ns/tax/income/credits/basic_personal_amount/additional_amount/additional_amount.yaml

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+description: Nova Scotia provides this additional amount under the basic personal amount.
+values: 
+  2022-01-01: 3_000
+metadata:
+  unit: currency-CAD
+  label: Nova Scotia basic personal amount additional amount
+  reference: 
+  - title: 2022 Nova Scotia Personal Tax Credits Return
+    href: https://hr.acadiau.ca/files/sites/hr/Payroll/Pensions%20&%20Benefits/NS_TD1_2022.pdf#page=1
+  - title: 2022 Worksheet NS428
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/5003-d/5003-d-22e.pdf#page=1
+  - title: Nova Scotia income tax act - subdivision c - Deduction for employment out of Canada
+    href: https://nslegislature.ca/sites/default/files/legc/statutes/income%20tax.pdf#page=24
+

policyengine_canada/parameters/gov/provinces/ns/tax/income/credits/basic_personal_amount/additional_amount/max_amount.yaml

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+description: Nova Scotia phases its additional basic personal amount out at this rate.
+brackets:
+  - threshold:
+      2022-01-01: 0
+    rate:
+      2022-01-01: 0
+  - threshold:
+      2022-01-01: 25_000
+    rate:
+      2022-01-01: 0.06
+
+metadata:
+  type: marginal_rate
+  rate_unit: /1
+  threshold_unit: currency-CAD
+  period: year 
+  label: Nova Scotia basic personal amount reduction rate
+  reference: 
+  - title: 2022 Nova Scotia Personal Tax Credits Return
+    href: https://hr.acadiau.ca/files/sites/hr/Payroll/Pensions%20&%20Benefits/NS_TD1_2022.pdf#page=1
+  - title: 2022 Worksheet NS428
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/5003-d/5003-d-22e.pdf#page=1
+  - title: Nova Scotia income tax act - subdivision c - Deduction for employment out of Canada
+    href: https://nslegislature.ca/sites/default/files/legc/statutes/income%20tax.pdf#page=24

policyengine_canada/parameters/gov/provinces/ns/tax/income/credits/basic_personal_amount/base.yaml

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+description: Nova Scotia provides this base amount under the basic personal amount.
+values: 
+  2022-01-01: 8_481
+metadata:
+  unit: currency-CAD
+  label: Nova Scotia basic personal amount base
+  reference: 
+  - title: 2022 Nova Scotia Personal Tax Credits Return
+    href: https://hr.acadiau.ca/files/sites/hr/Payroll/Pensions%20&%20Benefits/NS_TD1_2022.pdf#page=1
+  - title: 2022 Worksheet NS428
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/5003-d/5003-d-22e.pdf#page=1
+  - title: Nova Scotia income tax act - subdivision c - Deduction for employment out of Canada
+    href: https://nslegislature.ca/sites/default/files/legc/statutes/income%20tax.pdf#page=24

policyengine_canada/tests/gov/provinces/ns/tax/income/credits/ns_basic_personal_amount.yaml

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+- name: Person has taxable income lower than 25_000
+  period: 2023
+  input:
+    province_code: NS
+    total_individual_pre_tax_income: 24_999
+  output:
+    ns_basic_personal_amount: 11_481
+
+- name: Person has taxable income between 25_000 and 75_000
+  period: 2023
+  input:
+    province_code: NS
+    total_individual_pre_tax_income: 27_000
+  output:
+    ns_basic_personal_amount: 11_361
+
+- name: Person has taxable income between 25_000 and 75_000
+  period: 2023
+  input:
+    province_code: NS
+    total_individual_pre_tax_income: 70_000
+  output:
+    ns_basic_personal_amount: 8_781
+
+- name: Person has taxable income higher than 75_000 
+  period: 2023
+  input:
+    province_code: NS
+    total_individual_pre_tax_income: 75_001
+  output:
+    ns_basic_personal_amount: 8_481

policyengine_canada/variables/gov/provinces/ns/tax/income/credits/ns_basic_personal_amount.py

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+from policyengine_canada.model_api import *
+
+
+class ns_basic_personal_amount(Variable):
+    value_type = float
+    entity = Person
+    label = "Nova Scotia Basic Personal Amount"
+    definition_period = YEAR
+    defined_for = ProvinceCode.NS
+    reference = (
+        "https://hr.acadiau.ca/files/sites/hr/Payroll/Pensions%20&%20Benefits/NS_TD1_2022.pdf#page=1",
+        "https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/5003-d/5003-d-22e.pdf#page=1",
+        "https://nslegislature.ca/sites/default/files/legc/statutes/income%20tax.pdf#page=24",
+    )
+
+    def formula(person, period, parameters):
+        p = parameters(
+            period
+        ).gov.provinces.ns.tax.income.credits.basic_personal_amount
+        taxable_income = person("total_individual_pre_tax_income", period)
+
+        # Calculate additional amount added to base amount
+
+        reduced_additional_amount = max_(
+            0,
+            p.additional_amount.additional_amount
+            - p.additional_amount.max_amount.calc(taxable_income),
+        )
+        additional_amount = min_(
+            reduced_additional_amount, p.additional_amount.additional_amount
+        )
+
+        return p.base + additional_amount