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Humphrey Yang - Renting vs. Buying a Home: The 8.71% Rule

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Short Summary

Main recommendation: Compare the monthly cost of owning a home against the monthly rent for a comparable home using the 8.71% rule: multiply the home price by 8.71% and divide by 12. If the monthly rent is below that figure, renting is likely cheaper; if it is above, buying may come out ahead. The speaker presents this as a quick guideline rather than a full financial analysis and notes that the answer depends heavily on local numbers, mortgage rates, and how long you plan to stay.

Key Points

  • The 8.71% rule adds three unrecoverable annual costs: property taxes (1.11%), maintenance (1%), and cost of capital (6.6%).
  • Cost of capital combines the opportunity cost of the down payment (about 5% per year, based on stocks outperforming residential real estate) with annual loan interest, which the example sets at $28,000 on a $400,000 loan.
  • Example: a $400,000 home at 8.71% costs $34,840 per year, or about $2,903 per month. Rent below that figure heavily favors renting.
  • The speaker says mortgage rates are higher now (roughly 6.5% to 7.5%) than when the original framework was published, which is why the topic was refreshed.
  • The rule ignores irrationality, amortization (interest is front-loaded and shifts toward equity over 30 years), changing inflation and rates, and mortgage interest tax deductions.
  • Owning offers fixed payments, control over the property, inflation eroding the real value of the fixed payment, and potential appreciation; renting offers flexibility, no maintenance or property tax, and amenities.

Details Worth Noting

  • Concrete instructions:
    • Estimate the annual property tax by multiplying the home price by your local property tax rate. The U.S. average used is 1.11%.
    • Set aside maintenance money at 1% to 2% of the property's value per year. The example uses 1%, and older homes may need more.
    • Estimate the down payment's opportunity cost by using the return difference between stocks and real estate, about 5% per year in the U.S. example, or 3% to 5% in other countries per the speaker's rough research.
    • Estimate annual interest by multiplying the loan balance by the interest rate. The example uses a conservative $28,000 per year.
    • Add the three percentages together (taxes, maintenance, and cost of capital) to get the total, then multiply the home price by that total and divide by 12 for the monthly break-even.
    • Compare the result with the monthly rent for a comparable home in your area. The speaker's free Google Sheets calculator can be used to adjust the variables, including the home price, property tax, maintenance, down payment, and country.
  • The speaker says the rule assumes the same conditions over time, so it should be revised if mortgage rates, inflation, or the opportunity cost of equity change.
  • In the U.S., mortgage interest is deductible only if it exceeds the standard deduction of about $13,000 to $14,000 per individual; the benefit depends on the tax bracket, loan amount, and rate.
  • The speaker suggests buying is more attractive if you plan to stay in a place for more than 5 to 8 years.
  • The speaker explicitly says to run your own numbers, since rules differ by location and this is not professional financial advice.

Bottom Line

Use the 8.71% rule as a starting estimate, then run local numbers in the speaker's calculator, since high current mortgage rates and your expected length of stay will largely decide whether buying or renting is the better choice.