It depends on what you will be doing, and of course on your employer. Needless to say it is a good safeguard for both parties. In some states, if you are doing child or health care you have to be bonded and have a background check (usually by the state police). There are bond companies(check the yellow pages) and some homeowner's insurance will place a "rider" on the policy serving as a bond. The amount of money that is needed for security depends on the amount of bond you want.