The income source rules, the deduction allocation rules and the rules dealing with net losses in U. S. FTC limitation system have the same function of preventing taxpayers from abusing FTC.

此外，适用于抵兔限额计算的所得来源地确定规则、费用分摊规则和亏损处理规则，也有防范纳税人滥用抵兔、维护美国税收管辖权的功能。

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It currently provides a 9% tax deduction from net income for businesses engaged in "qualified production activities" in the U.S. Those activities include manufacturing a product, selling, leasing or licensing it, and engineering and software activities related to that production.

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