Table of Contents AZZ INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 4. Other Accrued Liabilities 5. Leases 58 The Company is a lessee under various leases for facilities and equipment. The following table outlines the classification of lease expense in the statements of income for fiscal 2021, 2020, and 2019 (in thousands): Other accrued liabilities consisted of the following as of February 28, 2021 and February 29, 2020 (in thousands): The following summarizes the estimated amortization expense for the next five fiscal years and beyond (in thousands): 2022 $ 12,111  2023 11,735  2024 9,907  2025 9,098  2026 9,069  Thereafter 31,971  Total $ 83,891  2021 2020 Accrued interest $ 957  $ 1,042  Accrued warranty 4,079  3,702  Commissions 3,550  4,180  Personnel expenses 9,709  8,646  Group medical insurance 2,517  3,083  Sales and other taxes payable 2,566  3,098  Other 3,758  3,117  Total $ 27,136  $ 26,868  2021 2020 2019 Cost of sales $ 10,533  $ 13,521  $ 11,630  Selling, general and administrative 4,485  4,923  4,002  Total lease expense $ 15,018  $ 18,444  $ 15,632 