Your income likely qualifies as investment income on Schedule E.
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The investment income derives from property that you own. This includes natural resources extracted from your property by a third party who leases your property, as well as royalties from intellectual property that you didn't create yourself.
Investment income includes amounts received from oil, gas or mineral properties when natural resources are extracted from your property. These royalties are based on units, such as barrels, tons, etc. and are paid to you by a person or company that leases the property from you. You may be eligible for a depletion allowance.