Sales taxes, including those imposed by local governments, are generally administered at the state level. States imposing sales tax require retail sellers to register with the state, collect tax from customers, file returns, and remit the tax to the state. Procedural rules vary widely. Sellers generally must collect tax from in-state purchasers unless the purchaser provides an exemption certificate. Most states allow or require electronic remittance of tax to the state. States are prohibited from requiring out of state sellers to collect tax unless the seller has some minimal connection with the state.