A business that leases its premises has promised a landlord a fixed sum every month for years, and cannot stop paying without closing the store. That promise ranks ahead of the bank in every practical sense: the rent is paid before the interest, and a landlord who is not paid changes the locks. A lender therefore reads a lease as borrowing with a different creditor, and adjusts the leverage ratio so that two businesses with the same obligations look the same whether one owns its stores and borrowed to buy them or the other rents them.
Lease-adjusted net debt = net debt + capitalised lease liability
Lease-adjusted EBITDA = EBITDA + rent (the rent comes out of costs)
Leverage = adjusted net debt ÷ adjusted EBITDA
Both sides move. The liability joins the debt; the rent, which was inside operating costs, comes back into earnings, because it is now being treated as the servicing of that debt. Adjust one side without the other and the ratio is wrong in a different way, as the example shows.