Fixed expenses
Bills that cost about the same amount every month, like rent, a car payment, insurance or a phone plan.
Fixed expenses are easy to plan for because the amount rarely changes. Rent or a mortgage, loan payments, insurance premiums and most subscriptions fit here.
They are also hard to cut quickly, since many come with a lease or contract. When you need to free up money, look at the biggest fixed bills when they come up for renewal, and at variable expenses in the meantime.