The phrase "the amount to which" is correct and usable in written English.
It is used to refer to a quantity or amount of something, usually to highlight that the amount in question is large or significant in some way. For example, "The amount to which he donated to the charity was incredibly generous."
A fortune in figures The amount to which ArcelorMittal's sales increased last year $105.2bn Lakshmi Mittal's personal fortune.
Instead of a monthly oral use of progestin, they said the hormone could be administered vaginally, which would limit the amount to which breast tissue might be exposed.
Cary Funk, lead author of the report, said the number of issues that scientists and the public disagreed on, and the amount to which they disagreed, were both surprising.
State law caps increases in a property's assessed value – the amount to which property tax rates are applied – to 6 percent in one year and 20 percent in five years.
From that debt I deducted $24,400, the amount to which $18,000 of debt upon graduation from a liberal arts college would grow in four years at a compound interest rate of 7.9 percent (that's at the high end of the interest rate medical students are charged on debt).
The used analysis model allowed determining the amount to which each characteristic contributed to the treatment choice.
The service has been losing money for several years (which forced us to gradually reduce our staff), and the amounts to which we are sentenced to pay today no longer allow us to meet our obligations.
To begin with, Mr President, our group was rather critical of the amounts involved and worked very hard to try to get the amounts to which the directive will be applicable increased.
Countries are also free to draw without discussion up to the net amount to which they have previously been drawn upon by other countries.
Multiple investigations, however, have found that airlines rarely pay passengers the full amount to which they're entitled.
It would also allow small businesses to write off more of the cost of new equipment, increasing the amount to $75,000 from $25,000, which is intended to promote investment.
