Your business can provide services to another business. Your business can invoice the other business for the services that you are providing on its behalf. The services you are providing should fall within the scope of the nature of the business you have joined or established. From a HMRC perspective, there are some limits to the type of services than can be sub-contracted on a full-time basis where the person doing the task may be perceived to be in a
master/servantworking relationship with the contracting entity, which would therefore demand a PAYE employed structure (and therefore outside the scope of the Tier 1 Ent. conditions).