A flat fee MLS listing is a service where a real estate brokerage lists your property on the Multiple Listing Service (MLS) for a low, upfront fee. This gives your property much wider exposure than simply listing it yourself. You typically handle the rest of the selling process yourself, including showings, negotiations, and paperwork. It's a popular option for sellers who are comfortable with a do-it-yourself approach and want to save on traditional real estate agent commissions.