Where payments exceed these limits they become fully taxable.是什么意思？

Where payments exceed these limits they become fully taxable.

付款额超过这些限度就得全部纳税.

where

adv. 哪里，在哪里，到哪里，某种情势或位置；conj. 在…的地方；n. 地方，场所；pron. 哪

例句
...a criminal proceeding where defendants have the right to confront their accusers.
被告有权与原告对质的一种刑事诉讼

payments

n. 支付，付款，缴纳，报酬( payment的名词复数 )，付出的[要付出的]款项，报答，报偿；

例句
I was told that in order to get benefit payments I would have to answer some questions.
我得知要领补助，就得回答一些问题。

exceed

vt. 超过，超越，胜过，越过…的界限；vi. 突出，领先；

例句
Expenses are deductible only to the extent that in aggregate they exceed 7 percent of gross income.
只有在消费总额超过总收入的7%时才可免税。

these

adj. 这些的；pron. 这些；

例句
There's lots of money about these days for schemes like this.
近来这类计划资金充足。

limits

n. 境界( limit的名词复数 )，界限，限度，限额；

例句
...the limits of the human auditory range.
人耳听觉范围的限度

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

become

vi. 变为，成为，变得，变成；vt. 适合，适宜，相称，相当，变成，发生；

例句
...abandoned buildings that become a breeding ground for crime.
沦为了犯罪温床的弃置楼群

fully

adv. 充分地，完全地，足足，彻底地；

例句
...scientific evidence that did not fully accord with the facts uncovered by the police.
与警方所掌握的情况不完全一致的科学证据

taxable

adj. 应纳税的；

例句
...a new tax band of 20p in the pound on the first £2,000 of taxable income.
对应税收入的头两千英镑每镑征收20便士的新税阶