What is the term for a fee that is paid regularly at a set rate?

The term that refers to a fee paid regularly at a set rate is a premium. In the context of insurance, for instance, a premium is the amount that policyholders must pay, usually on a monthly, quarterly, or annual basis, to maintain their insurance coverage. This fee is predetermined and consistent, allowing for predictable budgeting.

Interest, while a fee associated with borrowing money or the return on investment in savings accounts, varies based on the principal amount, the interest rate, and the duration, rather than being a fixed regular fee. Dividends represent a portion of a company's earnings distributed to shareholders and are not guaranteed or fixed in regularity. Deductions refer to amounts taken away from gross income or a total amount, primarily for tax purposes, and do not represent a regular fee.