Under U.S. Federal income tax law, a net operating loss (NOL) occurs when certain tax-deductibleexpenses exceed taxable revenues for a taxable year.[1] If a taxpayer is taxed during profitable periods without receiving any tax relief (e.g. a refund) during periods of NOLs, an unbalanced tax burden results.[2] Consequently, in some situations, Congress allows taxpayers to use the losses in one year to offset the profits of other years.
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The USPS reported a net loss of $5.6 billion for fiscal 2016, the 10th straight year its expenses have exceeded revenue.
(1) 本句主干结构为The USPS reported a net loss of $5.6 billion for fiscal 2016，逗号后面的为同位语，对前面的2016进行解释说明。在这个同位语中包含一个定语从句，即its expenses have exceeded revenue，修饰前面的the 10th straight year。
(2) 本句译文：美国邮政报告了2016财年56亿美元的净亏损，这是连续第十年它的支出超过收入。