Leasing is often used especially in the SME sector (micro, small and medium entrepreneurs). The popularity of this form of financing, despite the rather substantial costs, is primarily due to the fact that the company, not having its own financial resources for investment and having difficulty in obtaining bank loans, may benefit from the lease. In fact, the only collateral required here is a blank promissory note (other protection does not apply because the subject of the lease agreement remains the lessor's property), while banks charge relatively high security, examine the creditworthiness of companies and carefully analyze its financial situation. They also often, supervise the proper use of funds from the loan. All these limitations can be avoided choosing to purchase capital goods by leasing rather than a bank loan. Under conditions of considerable competition that prevails in the market, leasing gives SMEs the ability to implement new techniques and technologies promising high efficiency, without engaging their capital. Because they do not invest their own funds, lessee has the ability to make quick development decisions, which makes the unit more competitive. It can also carry out unexpected, but in certain conditions, profitable investments. This increases the liquidity of the company. Leasing, as a source of investment financing has many advantages for the lessee. The aim of the Authors is an attempt to analyze the legal and economic leasing business activity.