Rent vs. Buy Calculator — Which Option Is Actually Cheaper for You?
How do you really decide between renting and buying?
The question “should I rent or buy?” can’t be answered just by comparing monthly rent to a mortgage payment. The real answer depends on opportunity cost — what else you could do with the money tied up in a down payment or security deposit.
Locking $80,000 into a down payment means giving up the returns you could have earned investing that money elsewhere. That foregone return is called the opportunity cost, and it’s the key number most rent-vs-buy comparisons leave out.
The Core Formulas
True cost of buying
Down payment × expected annual return ÷ 12 = monthly opportunity cost on down payment
Plus: mortgage payment + property taxes + insurance + maintenance
Example: 80,000 down (20%), 7% mortgage rate, assuming 5% annual return on invested capital
- Monthly mortgage (P&I): ~$2,128
- Opportunity cost of down payment: 333/month**
- Property tax (~1.1% annually): ~$367/month
- Insurance + maintenance estimate: ~$300/month
- Total true monthly cost: ~$3,128
True cost of renting
Security deposit opportunity cost + monthly rent
Example: 2,500/month rent
- Security deposit opportunity cost: 12.50/month**
- Total true monthly cost: $2,512.50/month
Compare Both Options with the Calculator
Enter your local home price, rent, down payment amount, mortgage rate, and expected investment return to see a direct comparison of true monthly costs.
Rent vs Monthly Comparison
Housing Cost Optimization
Compare housing costs considering opportunity cost and interest rates.
Jeonse
Monthly Opp. Cost
₩666,667
Monthly Rent
Monthly Total Cost
₩1,066,667
Jeonse is Better
Monthly cost difference
Per Month
When Buying Tends to Win
- You plan to stay in the area for 5+ years (enough time for transaction costs to amortize)
- Local rent-to-price ratios are high (rent is expensive relative to purchase price)
- Mortgage rates are low relative to expected property appreciation
- You value stability and have reliable income
When Renting Tends to Win
- You have high-return investment opportunities for your down payment capital
- You plan to move within 3–5 years
- Home prices are inflated relative to rents (high price-to-rent ratio)
- You want to avoid the risks of homeownership (repairs, market downturns)
Rent vs. Buy at a Glance
| Factor | Renting | Buying |
|---|---|---|
| Upfront capital required | Low (deposit only) | High (down payment + closing costs) |
| Monthly fixed costs | Rent payment | Mortgage + taxes + insurance |
| Opportunity cost | Low | High (down payment tied up) |
| Financial risk | Lower | Market risk, maintenance costs |
| Tax benefits | Possible deductions (state-dependent) | Mortgage interest deduction (if itemizing) |
The Mortgage Interest Deduction — What It’s Worth Today
US homeowners who itemize deductions can deduct mortgage interest paid each year. However, since the 2017 Tax Cuts and Jobs Act roughly doubled the standard deduction, most middle-income homeowners no longer benefit from itemizing.
- Standard deduction (2024): 29,200 (married filing jointly)
- Worth itemizing if: mortgage interest + state/local taxes + other deductions exceed the standard deduction
- Example: 27,800 interest in year one. Add 32,800 total — just above the married standard deduction.
Factor this into your true-cost comparison for a complete picture.
Conclusion
The rent-vs-buy decision is not just a numbers question — it involves opportunity cost, your risk tolerance, life plans, and tax situation. Use the calculator above with your actual numbers to find the answer that fits your life, not just the headlines.
OIYO Editorial
Content Editor지식 인큐베이터이자 전문 콘텐츠 크리에이터. 경영, 경제, 법률 및 실생활에 유용한 실무/자격증 중심의 깊이 있는 정보를 연구하고 공유합니다.