Northwest Territories Pension Credit

Fixes #339

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

@@ -7,4 +7,5 @@ metadata:
   reference:
   - title: Income Tax Act - Age Credit page 29
     href: https://www.justice.gov.nt.ca/en/files/legislation/income-tax/income-tax.a.pdf
-  - title: 
+  - title: 2023 Northwest Territories Personal Tax Credits Return - pension income amount
+    href: https://www.canada.ca/content/dam/cra-arc/formspubs/pbg/td1nt/td1nt-23e.pdf

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

@@ -0,0 +1,76 @@
+- name: under 18 years old without disability, not head of the family, no childcare cost
+  period: 2022
+  input:
+    province_code: NT
+    age: 17
+    is_disabled: false
+    is_head: false
+    childcare_costs: 0
+  output:
+    nt_disability_amount_self: 0
+
+- name: under 18 years old without disability, not head of the family, with childcare cost over 3030
+  period: 2022
+  input:
+    province_code: NT
+    age: 17
+    is_disabled: false
+    is_head: false
+    childcare_costs: 3050
+  output:
+    nt_disability_amount_self: 0
+
+- name: under 18 years old with disability, not head of the family, with childcare cost over 3030
+  period: 2022
+  input:
+    province_code: NT
+    age: 17
+    is_disabled: true
+    is_head: false
+    childcare_costs: 3050
+  output:
+    nt_disability_amount_self: 0
+
+- name: under 18 years old with disability, is head of the family, with childcare cost over 3030
+  period: 2022
+  input:
+    province_code: NT
+    age: 17
+    is_disabled: true
+    is_head: true
+    childcare_costs: 3050
+  output:
+    nt_disability_amount_self: 17812
+
+- name: under 18 years old with disability, is head of the family, without childcare cost
+  period: 2022
+  input:
+    province_code: NT
+    age: 17
+    is_disabled: true
+    is_head: true
+    childcare_costs: 0
+  output:
+    nt_disability_amount_self: 17832
+
+- name: 18 years old with disability, is head of the family, with childcare cost over 3030
+  period: 2022
+  input:
+    province_code: NT
+    age: 18
+    is_disabled: true
+    is_head: true
+    childcare_costs: 3050
+  output:
+    nt_disability_amount_self: 12658
+
+- name: over 18 years old with disability, is head of the family, with childcare cost over 3030
+  period: 2022
+  input:
+    province_code: NT
+    age: 19
+    is_disabled: true
+    is_head: true
+    childcare_costs: 3050
+  output:
+    nt_disability_amount_self: 12658