home purchase vs rent calculator

How this home purchase vs rent calculator works

Most people compare only the monthly mortgage payment to monthly rent. That is useful, but incomplete. A realistic decision should account for ownership costs (taxes, insurance, maintenance, and selling costs), as well as the opportunity cost of tying up money in a down payment.

This calculator does exactly that. It simulates each month over your planned stay, then compares the estimated ending wealth from:

• Buying: ending net sale proceeds after mortgage payoff and selling costs.
• Renting: investment account balance after paying rent and investing the monthly difference.

Why “monthly payment” can be misleading

A mortgage payment has principal and interest. Principal builds equity, while interest is a true cost. But ownership also includes recurring expenses that renters usually do not pay directly:

• Property taxes
• Homeowners insurance
• Maintenance and repairs
• HOA dues (if applicable)
• Transaction costs when buying and selling

If you leave after only a few years, those buying/selling costs can dominate the outcome. If you stay longer, appreciation and mortgage amortization often tilt the result toward owning.

Key assumptions that drive the result

1) Time horizon

The number of years you plan to stay is usually the most important input. Short stays often favor renting because fixed transaction costs are spread over fewer years.

2) Home appreciation and investment return

Buying wins when home appreciation is strong relative to your alternative investment return. Renting can win if appreciation is weak and your invested cash compounds at a higher rate.

3) Rent growth

If local rents rise quickly, renting gets more expensive every year. In some markets, this alone can make buying financially competitive sooner than expected.

4) Maintenance and selling costs

Many back-of-the-envelope analyses underestimate these. Even a 1% annual maintenance assumption and a 5–7% selling cost can significantly change the math.

How to interpret your output

Focus on the “ending wealth” comparison, not just monthly cash flow:

• If homeowner wealth is higher, buying is projected to be the better financial choice under your assumptions.
• If renter wealth is higher, renting and investing the difference is projected to be better.

Then run a few sensitivity tests. Change appreciation, rent growth, and investment return by 1–2% to see if your conclusion is stable or fragile.

Practical decision framework (beyond math)

Even a strong calculator result should be balanced with lifestyle factors. Ask yourself:

• Do I value flexibility to move for career or family?
• Can I handle variable repair costs and the time burden of ownership?
• Would I actually invest the difference if I rent, or spend it?
• How stable is my income over the next 5–10 years?

The best decision is the one you can sustain emotionally and financially through market swings.

Bottom line

There is no universal winner. In some markets and timeframes, owning builds substantially more wealth. In others, renting and investing is the superior strategy. Use this calculator as a planning tool, test multiple scenarios, and pair the numbers with your personal priorities.