(1)年折舊率=2÷預(yù)計的折舊年限×100%，年折舊額=固定資產(chǎn)期初折余價值×年折舊率。 (2)月折舊率=年折舊率÷12 (3)月折舊額=年初固定資產(chǎn)折余價值×月折舊率 (4)固定資產(chǎn)期初賬面凈值=固定資產(chǎn)原值-累計折舊 (5)最后兩年，每年折舊額=（固定資產(chǎn)原值-累計折舊-凈殘值）/2