In everyday English the word “money” is uncountable. It is not used in the plural.
We say, e.g. I found some money under the bed / There is some money under the bed, whether it is one 1 cent coin or ten €100 notes.
We would never say I found some monies under the bed / There are some monies under the bed. And it is incorrect to say I found a money under the bed.
Money takes verbs in the singular: Money is… NOT Money are…
However, you are probably familiar with the word being used in the plural.
The plural of “money” is spelt in two different ways – “monies” and “moneys”. Both are correct, but, according to my research, “monies” is the more modern spelling.
Whichever way you spell it, the plural of “money” is used almost exclusively in formal business contexts.
Although “money” has this special plural form, it is still not a countable noun. A money, one money, or two monies etc. are incorrect. “Monies” is an uncountable plural noun.
“Monies” means sums of money. Each sum may be from a different source or earmarked for a different purpose.
He is responsible for handling fees and other monies due to the court.
These funds represent approximately 12% of total Arts Council monies.
If further monies are put into the trust the additional income will be assessed separately.
She would like to secure these monies for her children in the event of her husband remarrying after her death.