self-assessment
noun [ C or U ] uk/ˌself.əˈses.mənt/ us/ˌself.əˈses.mənt/
自我评估
a judgment, sometimes for official purposes, that you make about your abilities, qualities, or actions
UK自我估算（应缴税款）
a system in which people calculate for themselves how much tax they must pay
Make sure that you have submitted your self-assessment tax return and paid your tax for this year by 31 January . 确保在1月31日前递交自我估算表并缴纳这一年的应缴税款。