Rent-to-Own vs Buy Calculator

A lease-option or rent-to-own agreement on a house lets you move in as a tenant now and buy later at a price fixed today. You pay the normal market rent plus a rent premium on top, and some agreed share of what you pay comes back to you at closing as a rent credit. You also pay a one-off option fee up front for the right to buy.

What you actually pay

Total rent-to-own cost = (rent + premium) x lease months + option fee + (purchase price - rent credits)

Buying today instead = purchase price + closing costs

The five numbers that decide it

• Monthly rent: what the house would let for on the open market. If the landlord is charging well above that, the premium is bigger than it looks.
• Rent premium: the extra monthly amount that buys you the option. This is the part that is genuinely at risk.
• Rent credit: the share of each payment applied to the purchase price at closing. Contracts vary wildly, from nothing to 100% of the premium. A quoted percentage of the whole payment is far more generous than the same percentage of the premium alone, so read which one you are being offered.
• Option fee: typically 1% to 5% of the price, paid at signing. Usually credited toward the purchase, and usually forfeited if you walk away.
• Lease months: how long before you must exercise. One to three years is normal.

Worked example

A $300,000 house. Market rent $1,800, premium $300, so you pay $2,100 a month for 24 months. Rent credit 25% of each payment, option fee 3%.

• Rent paid over the lease: $2,100 x 24 = $50,400
• Rent credits earned: 25% of $50,400 = $12,600
• Option fee: 3% of $300,000 = $9,000
• Balance due at closing: $300,000 - $12,600 = $287,400
• Total rent-to-own cost: $346,800
• Buying today at 3% closing costs: $309,000

Read that comparison carefully

The two totals are not measuring the same thing, and this is where most rent-to-own marketing gets its persuasive power. The rent-to-own figure includes 24 months of housing you actually lived in. The buy-today figure does not include the 24 months of mortgage payments the owner would have made over the same period. Compare the gap against what you would have paid in rent anyway, not against zero.

The real question is narrower: is the premium plus the forfeited option fee a fair price for locking in today’s price and buying time to fix your credit or save a deposit? Sometimes it is. In a flat or falling market it almost never is, because you are paying for the right to buy at a price the market has already left behind.

Where these deals go wrong

You lose the option fee and every dollar of rent credit if you cannot get a mortgage by the deadline, and that deadline does not move. Verify the seller actually owns the property outright and is current on any mortgage, because their default can wipe out your option. Get the agreed purchase price, the credit percentage and the deadline in writing, and have a real estate solicitor read it before you sign.