If the cloud service is deemed taxable, the next important consideration is to identify the state or states to which the transaction should be sourced. Sourcing is largely dependent on how the cloud service transaction is characterized.
If the cloud service transaction is characterized as the sale of tangible personal property, it will be sourced based on its destination or use. However, determining use is a controversial question. Some states will argue that use is where the software resides on a server, while others will argue that use is where the users are located. For states that tax cloud services as the sale of tangible personal property, the prevailing view is that use is where the user is located.
If the cloud service transaction is characterized as a service, it will be sourced to the location where the benefit of the service is derived, which may include more than one state. Given that sales tax is charged at the time of sale, this can create its own challenges. Indeed, purchasers of cloud services may not know in advance where the services will be used.
In the case of services in which there is a multi-state benefit, a taxpayer should apportion the tax base and tax only that portion of the service for which the benefit is being received in the taxing jurisdiction. Without this information being contained in the contract, a purchaser may deliver to the seller, in conjunction with its purchase, a form disclosing the fact that the service will be concurrently used in multiple jurisdictions or attest to the percentage of use in each taxing jurisdiction.
Upon receipt of such documentation, the seller may charge sales tax based on the percentage of use allocated to each of the applicable taxing jurisdictions in which it has a collection responsibility (i.e. sales tax nexus). In those jurisdictions, where the seller does not have nexus and does not charge sales tax, the purchaser would be responsible for remitting use tax on the service. In most states, there is no specific form for this allocation, but this type of documentation can be incorporated into the contract to protect all parties in the event of an audit.