South Carolina sales tax cut for people age 85 and older

changelog_entry.yaml

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+- bump: minor
+  changes:
+    added:
+    - South Carolina sales and use tax, general and elderly.

policyengine_us/parameters/gov/states/sc/tax/sales_and_use/exclusion/age_threshold.yaml

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+description: South Carolina provides a lower state sales and use tax rate for filers of this age and older.
+values:
+  2021-01-01: 85
+
+metadata:
+  unit: year
+  period: year
+  label: South Carolina sales and use tax exclusion age threshold
+  reference: 
+    - title: SC REVENUE RULING 08-5
+      href: https://dor.sc.gov/resources-site/lawandpolicy/Advisory%20Opinions/RR08-5.pdf#page=2

policyengine_us/parameters/gov/states/sc/tax/sales_and_use/exclusion/percentage.yaml

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+description: South Carolina excludes the following percentage of the sales and use tax for elderly filers.
+metadata:
+  unit: /1
+  label: South Carolina sales and use tax senior exclusion percentage
+  reference: 
+    - title: SC REVENUE RULING 08-5
+      href: https://dor.sc.gov/resources-site/lawandpolicy/Advisory%20Opinions/RR08-5.pdf#page=2
+
+values:
+  2021-01-01: 0.01

policyengine_us/parameters/gov/states/sc/tax/sales_and_use/general.yaml

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+description: South Carolina imposes a general sales and use tax rate of this amount.
+metadata:
+  unit: /1
+  label: South Carolina general sales and use tax
+  reference: 
+    - title: SC REVENUE RULING 08-5
+      href: https://dor.sc.gov/resources-site/lawandpolicy/Advisory%20Opinions/RR08-5.pdf#page=1
+
+values:
+  2021-01-01: 0.06

policyengine_us/tests/policy/baseline/gov/states/sc/tax/sales_and_use/sc_sales_and_use_exclusion_eligible.yaml

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+- name: Person age 85 or above eligible for tax exclusion
+  period: 2022
+  input:
+    age: 90
+    state_code: SC
+  output:
+    sc_sales_and_use_exclusion_eligible: true
+
+- name: Person age under 85 not eligible for tax exclusion
+  period: 2022
+  input:
+    age: 70
+    state_code: SC
+  output:
+    sc_sales_and_use_exclusion_eligible: false

policyengine_us/tests/policy/baseline/gov/states/sc/tax/sales_and_use/sc_sales_and_use_tax.yaml

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+- name: Person age 85 or above eligible for tax exclusion
+  period: 2022
+  input:
+    sc_sales_and_use_exclusion_eligible: true
+    sc_sales_and_purchases_proceeds: 10_000
+    state_code: SC
+  output:
+    sc_sales_and_use_tax: 500
+
+- name: Person age under 85 not eligible for tax exclusion
+  period: 2022
+  input:
+    sc_sales_and_use_exclusion_eligible: false
+    sc_sales_and_purchases_proceeds: 10_000
+    state_code: SC
+  output:
+    sc_sales_and_use_tax: 600

policyengine_us/variables/gov/states/sc/tax/sales_and_use/sc_sales_and_purchases_proceeds.py

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+from policyengine_us.model_api import *
+
+
+class sc_sales_and_purchases_proceeds(Variable):
+    value_type = float
+    entity = TaxUnit
+    label = "South Carolina sales and purchases proceeds"
+    unit = USD
+    definition_period = YEAR

policyengine_us/variables/gov/states/sc/tax/sales_and_use/sc_sales_and_use_exclusion_eligible.py

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+from policyengine_us.model_api import *
+
+
+class sc_sales_and_use_exclusion_eligible(Variable):
+    value_type = bool
+    entity = TaxUnit
+    label = "Eligible for South Carolina sales and use tax senior exclusion"
+    definition_period = YEAR
+    reference = "https://dor.sc.gov/resources-site/lawandpolicy/Advisory%20Opinions/RR08-5.pdf#page=2"
+    defined_for = StateCode.SC
+
+    def formula(tax_unit, period, parameters):
+        p = parameters(period).gov.states.sc.tax.sales_and_use.exclusion
+        person = tax_unit.members
+        age = person("age", period)
+        age_eligible = age >= p.age_threshold
+        return age_eligible

policyengine_us/variables/gov/states/sc/tax/sales_and_use/sc_sales_and_use_tax.py

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+from policyengine_us.model_api import *
+
+
+class sc_sales_and_use_tax(Variable):
+    value_type = float
+    entity = TaxUnit
+    label = "South Carolina sales and use tax"
+    unit = USD
+    reference = "https://dor.sc.gov/forms-site/Forms/ST3.pdf#page=2"
+    definition_period = YEAR
+    defined_for = StateCode.SC
+
+    def formula(tax_unit, period, parameters):
+        p = parameters(period).gov.states.sc.tax.sales_and_use
+
+        # base amount
+        taxable_sales_and_purchases = tax_unit(
+            "sc_sales_and_purchases_proceeds", period
+        )
+
+        # sales and use tax rate with eligible exclusion
+        eligible = tax_unit("sc_sales_and_use_exclusion_eligible", period)
+        exclusion = p.exclusion.percentage * eligible
+        rate_applied = p.general - exclusion
+
+        # return base amount * rate_applied
+        return taxable_sales_and_purchases * rate_applied