Money decisions, compared

Four decisions where the right answer genuinely depends on your numbers. Each one lays out when either side wins, works through an example, and hands you the calculator that settles it for your situation.

• Renting vs. Buying a Home

  The instinct that renting is throwing money away treats a mortgage payment as savings. Most of an early mortgage payment is interest, and buying carries costs renting never does — maintenance, property tax, insurance, and the transaction costs on both ends. The real comparison is net worth after N years under each path.

• Roth vs. Traditional Retirement Accounts

  The entire question is one comparison: your tax rate now versus your tax rate when you withdraw. A Traditional contribution skips tax today and pays it later; a Roth pays tax today and withdraws free. Everything else is a detail.

• Debt Snowball vs. Debt Avalanche

  The avalanche method — highest interest rate first — is mathematically optimal and always costs less. The snowball method clears the smallest balance first, which costs more in interest but produces visible wins sooner. The gap between them is usually smaller than people expect.

• Leasing vs. Buying a Car

  A lease almost always has the lower monthly payment, which is exactly why comparing payments is the wrong move. Financing builds equity in an asset you keep; leasing buys use of a car for a fixed term and leaves you with nothing at the end. Compare total cost net of what the car is still worth.