Delaware has no sales tax, and does not allow cities or counties to levy any type of sales tax. Businesses are taxed on their gross receipts as an alternative to sales tax, but this tax cannot be passed on to consumers. A 3.75% "document fee" is collected on all automobile sales, and occupational license taxes of up to 1.92% are also collected on certain business activity.
While Delaware does not collect a sales tax, excise taxes are levied on the sale of certain products, including alcohol, cigarettes & tobacco, and gasoline. These excise taxes are passed on to the consumer in the goods' price
Isn't Delaware also where credit card companies are based out of, due to less strict regulations? All that extra revenue from people all across the country will certainly help offset taxes on the locals.