Assuming that you are talking about 1099-MISC. Note that there are other 1099s.check this post - Form 1099 MISC Rules & RegulationsQuick answer - A Form 1099 MISC must be filed for each person to whom payment is made of:$600 or more for services performed for a trade or business by people not treated as employees,Rent or prizes and awards that are not for service ($600 or more) and royalties ($10 or more),any fishing boat proceeds,gross proceeds of $600, or more paid to an attorney during the year, orWithheld any federal income tax under the backup withholding rules regardless of the amount of the payment, etc.