We project both the expected cash flows from your income and expenses, as well as from any assets (investments, home, etc) and liabilities (credit card debt, car loans, etc) that you may have. We assume that your income stops at your retirement, but that your living expenses continue for your lifetime. We assume that you want to maintain the same lifestyle after the retirement as you have now.
For mortgages and other loans, we project gradual repayment based on the loan remaining term to maturity and interest rate. For credit cards and other personal debts, we assume that you repay them gradually within 12 months.