凱投宏觀（Capital Economics）北美首席經濟學家保羅·阿什沃思（Paul Ashworth）指出，新稅率是依據1974 年《貿易法》第122條實施，而該條文「明確規定任何關稅必須以不歧視的方式適用」，這意味著先前的協議很可能會受到影響。
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"We can raise it up again after a year to change the batteries. That means we can avoid using divers, which is a really risky operation that we wanted to avoid," he said.
However, is it true that married couples pay more tax?