Businesses and some individuals employ a lawyer on a retainer basis. This means the lawyer accepts a down payment toward a fee for legal services. In exchange for the retainer, the lawyer will be available to work for you on any agreed upon legal matter that may require his or her services. You may have to pay additional costs for services involving extra time and effort by your lawyer. Your lawyer should explain the particulars of your retainer agreement to you in advance, since there are several different types of retainer agreements.