"supplementary charges" is a correct and usable phrase in written English.
It refers to additional fees or costs that are charged on top of the original amount. This phrase can be used in various contexts such as legal documents, financial statements, or customer invoices. Example: The hotel's room rate includes breakfast, but guests should be aware that there are also supplementary charges for room service and laundry services.
I may be subject to supplementary charges for excessive aircraft, boat, or automobile wear and tear.
The 32 euro prix fixe menu offers pretty much everything the kitchen turns out except côtes de boeuf, though there are the usual supplementary charges for truffles and the like; it's a good buy.
For the avoidance of doubt, the prize excludes all other costs including but not limited to food and drink, any additional accommodation or travel, any inoculation and/or vaccination costs, hotel supplementary charges, VISA applications and any insurance, including but not limited to travel and medical insurance, unless otherwise stated.
Osborne used a budget five years ago to raise the supplementary charge on oilfields from 20%to32%20%to32%
"The supplementary charge levied on oil and gas production will increase from 20%to32%20%to32%
Seats in the first three rows subject to a supplementary charge.
The chancellor halved a supplementary charge levied on offshore fields and completely abolished a 30% petroleum revenue tax.
The industry gets £1bn of tax cuts as the supplementary charge on oil and gas is cut from 20%to10%0%.
The Liberal Democrats will press for a supplementary charge on banks until 2017-18 to be announced in next month's budget, Danny Alexander, the Treasury chief secretary has announced.
The levy would apply to UK residents with more than £10m in assets, with a supplementary charge for those with more than £20m in shares and property.
Osborne used the autumn statement to make an initial cut to the North Sea supplementary charge – from 32%to30%0% – but it was widely interpreted as being too little, too late.
