Buy vs Rent

Purpose

This calculator compares the economic cost of buying an asset with renting it over the same period.

It uses present value (PV) to account for the time value of money, so payments occurring at different times can be compared on an equivalent basis.

Inputs

Purchase Price

The price paid to purchase the asset at the beginning of the evaluation period.

The calculator assumes the purchase is made with cash.

Use Period

The number of years you expect to use the asset.

Both buying and renting are compared over this same period.

Residual / Salvage Value

The estimated value of the purchased asset at the end of the use period.

A higher residual value reduces the economic cost of buying because the asset retains value that can be recovered through sale or disposal.

Annual Ownership Cost

Recurring annual costs associated with owning the asset, such as maintenance, insurance, licensing, or similar costs.

Only costs entered here are included in the calculation.

Monthly Rent

The initial monthly rental payment.

The calculator assumes rent is paid monthly at the end of each month.

Annual Rent Escalation

The expected annual percentage increase in rent.

For example, 3% means that the monthly rent increases by approximately 3% at the beginning of each new rental year.

Opportunity Return

The annual return that could potentially be earned on money used to purchase the asset.

This represents the opportunity cost of capital and is also used as the discount rate for future cash flows.

Results

Buy vs Rent

The table compares the two alternatives using present values.

Initial Cost

The initial cash outlay required to buy the asset.

Renting has no initial purchase cost in this calculation.

PV of Ongoing Costs

The present value of recurring ownership costs versus the present value of all rental payments over the use period.

PV of Residual Value

For buying, the estimated residual value is discounted back to today's value and deducted from the cost of ownership.

Renting has no residual asset value.

Economic Cost (PV)

This is the main comparison.

It represents the estimated economic cost of each alternative after accounting for:

• Initial purchase cost
• Recurring ownership costs
• Rental payments
• Rent escalation
• Residual value
• Opportunity cost of capital

Rent − Buy

The Rent − Buy column shows how much more or less expensive renting is compared with buying.

• Positive value → buying is cheaper.
• Negative value → renting is cheaper.
• Zero → the two alternatives have approximately the same economic cost.

Break-even Monthly Rent

This shows the initial monthly rent at which renting and buying have approximately the same economic cost, given the other assumptions.

If the actual rental price is:

• Below the break-even rent → renting is financially more attractive.
• Above the break-even rent → buying is financially more attractive.

This is often one of the most useful results when negotiating a rental or deciding whether an asset should be purchased.

Understanding the Calculation

The calculator does not simply compare the purchase price with the sum of rental payments.

A dollar paid today has a different economic value from a dollar paid several years from now. Future rental payments and ownership costs are therefore discounted using the specified opportunity return.

For buying, the calculation also recognizes that the asset may still have value at the end of the use period.

Consequently, a purchase can have a high initial cost but still be economically preferable if the asset has a substantial residual value and rental payments are high.

Example

Suppose an asset costs $50,000 to purchase and is expected to be used for 5 years.

If it can be rented for $1,000 per month, the calculator considers not only the monthly rent payment but also:

• Expected rent increases
• Ownership and maintenance costs
• The asset's value after 5 years
• The return that could have been earned on the purchase money

The resulting Economic Cost (PV) provides a more meaningful comparison than simply adding up the nominal payments.

Important Assumptions

This calculator assumes:

• The purchase is made with cash rather than a loan.
• Ownership costs occur annually.
• Rent is paid monthly.
• Rent increases annually according to the specified escalation rate.
• The residual value is received at the end of the use period.
• The specified opportunity return is an appropriate discount rate.
• The asset provides equivalent use or benefit whether purchased or rented.

Taxes, depreciation, financing costs, transaction costs, insurance differences, and other factors are not included unless incorporated into the ownership-cost inputs.

The result is a financial comparison based on the assumptions entered and should not be considered personalized financial advice.