Update specs. (#45)

app/services/federal_tax_calculator.rb

@@ -14,14 +14,9 @@ def call
   attr_accessor :income
 
   def calculate
-    bracket = FederalTaxBracket.where("bottom_range_cents <= ?", taxable_income.fractional).order(:bottom_range_cents).last
-    taxable_at_bracket_rate = Money.new(taxable_income - bracket.bottom_range)
+    bracket = FederalTaxBracket.where("bottom_range_cents <= ?", income.fractional).order(:bottom_range_cents).last
+    taxable_at_bracket_rate = Money.new(income - bracket.bottom_range)
     rated = bracket.rate * taxable_at_bracket_rate
     rated + bracket.cumulative
   end
-
-  def taxable_income
-    # 2024 standard deduction = 13,850
-    @taxable_income ||= income - StandardDeduction.first.amount
-  end
 end

spec/services/federal_tax_calculator_spec.rb

@@ -11,16 +11,14 @@
 
   let!(:salary_income) { create(:income) }
   let!(:tax_brackets) { create(:federal_tax_bracket, :with_all_tiers) }
-  let!(:standard_deduction) { create(:standard_deduction) }
 
   it { expect(service).to be_a Money }
 
   it "calculates federal tax" do
     # salary_income = $50,000
-    # standard_deduction = $13,850
     # tax_brackets = 10% on first $1,000, 15% from $1,001 to $100,000, 25% from $100,001 to $500,000
 
-    expect(service.format).to eq("$5,372.35")
-    expect((salary_income.rate - service).format).to eq("$44,627.65")
+    expect(service.format).to eq("$7,449.85")
+    expect((salary_income.rate - service).format).to eq("$42,550.15")
   end
 end