What the capital stack is
The capital stack is just the layers of money that pay for a project, stacked from safest at the bottom to riskiest at the top. People use the phrase because a project is almost never paid for by one source. It is a mix, and the mix has an order.
The order matters because it decides who gets paid back first if the homes sell for less than hoped, and who is taking the most risk for the highest possible reward.
The three main layers
From safest to riskiest, most multiplex projects use some version of these three layers:
- Your equity: your own cash and the value of land you own. It is repaid last, so it carries the most risk. Lenders want to see it before they add their money.
- Construction debt: the construction mortgage from a bank or credit union. It is the cheapest money and is repaid first when the homes sell.
- Gap or partner money: private loans or an equity partner that sit between your equity and the main loan. More expensive, more flexible, used to close the gap.
Why the order changes the cost
The layer that gets paid back first takes the least risk, so it charges the least. That is why a bank construction mortgage is cheaper than a private loan, and why a lender is cheaper than an equity partner who only gets paid if the project works.
Debt is cheaper than equity, but it has to be repaid no matter what happens. Equity costs more but it is patient and flexible. Getting the balance right is the real skill in funding a project.
A simple way to picture it
Imagine a project costs a certain amount to finish. Your own money and your land form the base. The construction mortgage covers the largest slice on top of that. If there is still a gap between the two, a private loan or a partner fills it.
When the homes sell, the money flows back in reverse: the construction lender is paid first, then any gap lender, and your equity and profit come last. That is why lenders feel safe and why owners carry the real risk and reward.