I understand that Trump has been accused of paying hush money to Stormy Daniels.
It's not that he paid hush money, it's that he took (or ordered the taking of) money from a fund, from the Trump Organization which is a taxed legal entity set up for a specific purpose, not including hush money...and those funds are taxed and it is recorded what those expenses are in such a way that capital gains are taxed. If there are lies to the govt about what expenses are legitimate business expenses, that is fraud, which is the allegation.
So the fund was Trump Organization business entity and the fraud was that this was a business legal expense for the Trump Organization, but it wasn't. It was a personal expense. This is part of a larger systematic fraud perpetrated by the Trump Organization. Recall they would also inflate prices of real estate properties to investors but then deflate the value of the properties for tax purposes. So on top of those shenanigans, the business entity was also allegedly being used for personal expenses, but declaring legal expenses and thus not being taxed for that portion. Big tax fraud in total of which the hush money was only a small part...
But it probably isn't only Stormy Daniels. He also paid other people hush money, too, and committed more fraud when taking the money from other sources than his personal accounts. For example, he allegedly used his rich boy ties to the National Enquirer owner to divert money to playboy model Karen McDougal to also keep her quiet.