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# Who cares about Domain Rules?

, 20 Nov 2006 MIT
With this article, I am evolving a domain problem towards the best possible solution.
 BusinessRules 0 - Procedural_Way 0 - Procedural_Way.smp ProceduralWay.cd Tests 1 - Evolution One 1 - Evolution One.smp EvolutionOne.cd Tests 2 - Evolution Two 2 - Evolution Two.smp EvolutionTwo.cd Tests 3 - Evolution Three 3 - Evolution Three.smp EvolutionThree.cd IncomeTaxEngine.cd Tests 4 - Evolution Four 4 - Evolution Four.smp EvolutionFour.cd Tests 5 - Evolution Five 5 - Evolution Five.smp EvolutionFive.cd TaxBandGenerator.cd Tests bin Debug BusinessRules.dll BusinessRules.dll.lastcodeanalysissucceeded NMock2.dll BusinessRules.csproj.user obj Debug BusinessRules.dll TempPE Properties Tools NMock2.dll nunit.framework.dll ```namespace BusinessRules.Evolution_Three { /// /// Australian Investor Business Rule Domain object specific to australian investors. /// internal class AustralianIncomeTaxEngine : IncomeTaxEngine { #region Methods /// /// Calculates the tax rate. /// /// The investor. /// /// Returns a double representing the tax liability for the investor. /// public override double CalculateTaxRate(double income) { if (income >= 0.0 && income <= 6000.99) return 0.0; else if (income >= 6001.00 && income <= 25000.99) return 0.15; else if (income >= 25001.00 && income <= 75000.99) return 0.30; else if (income >= 75001.00 && income <= 150000.99) return 0.40; else return 0.45; } /// /// Calculates the tax liability. /// /// The investor. /// /// Returns a double representing the tax rate for the investor. /// public override double CalculateTaxLiability(double income) { double taxLiability = 0.0; if (income >= 6001.00 && income <= 25000.99) { taxLiability += (income - 6000.99) * 0.15; } if (income > 25000.99) { taxLiability += (25000.99 - 6001.00) * 0.15; } if (income > 75000.99) { taxLiability += (75000.99 - 25001.00) * 0.30; } if (income >= 25001.00 && income <= 75000.99) { taxLiability += (income - 25001.00) * 0.30; } if (income > 150000.99) { taxLiability += (150000.99 - 75001.00) * 0.40; } if (income >= 75001.00 && income <= 150000.99) { taxLiability += (income - 75001.00) * 0.40; } if (income > 150000.99) { taxLiability += (income - 150000.99) * 0.45; } return taxLiability; } #endregion } }```

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