Methodology

How each calculator works: the formulas, the assumptions and what the model leaves out. Official figures and when they were last reviewed are on Sources and updates.

• How the Rental Property Analyzer works
  The model behind the Rental Property Analyzer: long-term and short-term rental revenue, operating costs, NOI, DSCR, cash flow, taxes, depreciation, exit and IRR.
• How the Retirement Plan Explorer works
  The model behind the Retirement Plan Explorer: today's dollars, separate account types, a withdrawal rate that follows retirement length, the early-access bridge, Social Security and stress tests.