Leasing means that paying the costs of the building will be an expense, deducted before tax. Previously, the company was paying for its building costs by owning the building and paying a long-term loan, which is paid, apart from the interest, with after-tax finance. Therefore, L C will see its expenses rise and its profit before interest and tax decline. Additionally, when the company sells the current building and pays off its long-term debt, interest expense will decrease. LC's tax expense will also decline, as the lease payments will be higher than interest expense, and the net profit after interest before tax will be lower.