using System;

public class Program

{

    public static void Main()

    {

        double a = 150000;

        double ss = 3116 * 12;

        var withdraw = TaxCalculator.CalculateAmountToWithdraw(a,ss);

        Console.WriteLine(withdraw.ToString("C"));

        var b = TaxCalculator.CalculateTax(150000, TaxCalculator.federalBrackets, TaxCalculator.federalRates);

        Console.WriteLine(b);

    }

}

​

    public class TaxCalculator

    {

        // 2025 Federal Tax Brackets for Married Filing Jointly

        public static double[] federalBrackets = { 23850, 95950, 206700, 394600, 501050, 751600 };

        public static double[] federalRates = { 0.10, 0.12, 0.22, 0.24, 0.32, 0.35, 0.37 };

​

        // 2025 California State Tax Brackets for Married Filing Jointly

        public static double[] stateBrackets = { 20824, 49368, 77918, 108162, 136700, 698274, 837922, 1396542 };

        public static double[] stateRates = { 0.01, 0.02, 0.04, 0.06, 0.08, 0.093, 0.103, 0.113, 0.123 };

​

        // Standard Deduction for Married Filing Jointly

        public static double federalStandardDeduction = 30000;

        public static double stateStandardDeduction = 10726;

​

        /// <summary>

        /// given an amount needed for living expenses and other income, calculate the amount to withdraw to cover living expenses and taxes

        /// </summary>

        /// <param name="amountNeeded"></param>

        /// <param name="socialSecurityIncome"></param>

        /// <returns></returns>

        public static decimal CalculateAmountToWithdraw(double amountNeeded, double socialSecurityIncome)

        {

            double amountToWithdraw = amountNeeded;

            double previousAmountToWithdraw;

            const double tolerance = 5.0; // Tolerance for the iterative approach

​

            do

            {

                previousAmountToWithdraw = amountToWithdraw;

​

                // Calculate total taxable income

                double totalIncome = amountToWithdraw + socialSecurityIncome;

                double federalTaxableIncome = totalIncome - federalStandardDeduction;

                double stateTaxableIncome = totalIncome - stateStandardDeduction - socialSecurityIncome;  // California doesn't tax SS

​

                // Calculate federal tax

                double federalTax = CalculateTax(federalTaxableIncome, federalBrackets, federalRates);

​

                // Calculate state tax

                double stateTax = CalculateTax(stateTaxableIncome, stateBrackets, stateRates);

​

                // Total tax owed

                double totalTax = federalTax + stateTax;

​

                // Update amount to withdraw to cover living expenses and taxes

                amountToWithdraw = amountNeeded + totalTax;

​

            } while (Math.Abs(amountToWithdraw - previousAmountToWithdraw) > tolerance);

​

            return (decimal)amountToWithdraw;

        }

​

        public static double CalculateTax(double taxableIncome, double[] brackets, double[] rates)

        {

            double tax = 0;

            double previousBracketLimit = 0;

​

            for (int i = 0; i < brackets.Length; i++)

            {

                if (taxableIncome > brackets[i])

                {

                    tax += (brackets[i] - previousBracketLimit) * rates[i];

                    previousBracketLimit = brackets[i];

                }

                else

                {

                    tax += (taxableIncome - previousBracketLimit) * rates[i];

                    break;

                }

            }

​

            // If taxable income exceeds the highest bracket

            if (taxableIncome > brackets[brackets.Length - 1])

            {

                tax += (taxableIncome - brackets[brackets.Length - 1]) * rates[rates.Length - 1];

            }

​

            return tax;

        }

    }