What a lease option is
A lease option combines two agreements: a lease that lets you control and rent out a property, and an option that gives you the right to buy it at a price agreed today, at any point within an agreed term. You pay the owner a (often small) option fee up front and a monthly payment - usually enough to cover their mortgage - and you keep the difference between that and the rent you collect. If values rise, you can exercise and buy at the old, lower price; if they do not, you can walk away.
How the calculator works
- Monthly cash flow = rent you collect - the payment to the owner - your running costs.
- Built-in equity today = current market value - the agreed purchase price (your day-one margin if you bought now).
- Projected value applies your assumed annual growth across the option term.
- Equity on exercise = projected value - agreed price; subtract SDLT (with the 5% surcharge if it is an additional property) and buying fees for the net.
- Total profit if you exercise = cash flow over the term + equity captured - costs - the cash you put in.
Worked example - 5-year option
Agreed price £150,000; worth £160,000 now (so £10,000 built in); £5,000 option fee.
Rent £1,100/mo, pay the owner £600, costs £150 - that is £350/mo, about £21,000 over five years.
At 3% growth the property reaches about £185,500; exercising captures roughly £35,500 of equity before about £9,500 of SDLT and fees - total profit around £42,000 on £5,000 in.
Why investors use lease options
The appeal is control with very little capital: you profit from the rent and any growth without needing a deposit or a mortgage at the outset, and you lock tomorrow's purchase at today's price. They suit motivated sellers - someone in negative equity, a tired landlord, or a property that will not sell - where a conventional purchase does not work. The trade-off is complexity and risk: the agreement must be drafted properly by a solicitor, the seller's lender position and any restrictions must be checked, and you carry the running risk during the term.
The risks to weigh
- Title and lender: the owner's mortgage may restrict an option - this must be checked legally before you commit.
- Negative cash flow: if rent does not cover the payment plus costs, the deal bleeds money every month.
- Stalled growth: if values do not rise, the equity you were counting on may not appear - though you can choose not to exercise.
- Always use a specialist property solicitor; a lease option is a legal contract, not a handshake.
This tool is a planning aid, not legal or financial advice. Lease options are nuanced - take professional advice and have every agreement drafted and reviewed by a solicitor.