Rent vs. Buy

Deciding whether to buy or rent is one of the most consequential financial decisions most households face. The core insight is straightforward: buying requires a large upfront investment (down payment and closing costs) but builds equity over time through loan paydown and appreciation. Renting requires minimal upfront cash and provides predictable monthly costs, but every dollar spent on rent is gone forever with no asset value created. A commonly cited rule of thumb is that buying needs roughly 5 to 7 years to beat renting.

However, local market conditions dramatically affect this number. In high-cost coastal cities like San Francisco, Los Angeles, or New York, where home prices are high relative to local rents, the break-even may stretch to 10 years or more. In lower-cost Midwestern or Southern markets, buying can be cheaper than renting almost from the start. Edge cases worth considering: if you expect to move within 3 years, renting is almost always superior because transaction costs consumed at purchase and sale will eat any equity gains.

If interest rates drop after you buy, refinancing can strengthen the buy-side economics. The calculator models the opportunity cost of the down payment (a 7% investment return), selling costs (6%), homeowner's insurance and PMI, but not the mortgage interest tax deduction, which can shift the comparison.