Hawaii Chapter 13 Calculation of Your Disposable Income is the process of determining the amount of money a debtor is allowed to keep each month in order to fund their Chapter 13 repayment plan. This calculation is done by subtracting the debtor’s expenses from their total monthly income. The expenses include living expenses such as food, housing, and transportation, as well as other necessary payments such as child support, alimony, and taxes. The remaining amount is the debtor’s disposable income, which is used to fund their repayment plan. There are two different types of Hawaii Chapter 13 Disposable Income Calculations: the Formal and the Allowable Expense Calculation. The Formal Calculation requires the debtor to submit a detailed list of their expenses to the court, and the Allowable Expense Calculation uses federal guidelines for determining the debtor’s expenses.