Franchise Royalty

This is a percentage of your gross sales (not profit) usually paid to the franchisor (corp office) monthly or quarterly. There is often a minimum amount due, even if you are having a slow period or there is no profit for that time. However you can ask in advance to have a no-fee-due clause in your agreement if your business is temporarily closed due to weather, family emergency, or other disaster.

Compare the royalty in advance to others in the same industry and you will find some higher or lower. This doesn't necessarily mean it's better or worse until you compare what you are receiving for this royalty. There should also be a 5-10 grace period without a late fee for your royalty payments. Some franchisors will offer automatic debits from your bank account so you don't forget to pay. Royalty is the life blood of the corporate office and they usually watch your payments very closely.
More information on franchises in chapter 3 of my new book "90 Days to Success as a Small Business Owner" available everywhere.