In Castellano (from Spain), it is called IVA, or Impuesto sobre el valor añadido. In other countries of South and Central America, it is called impuesto al valor agregado among other variations.
In Spanish, tax (as a noun) is "impuesto".
vendedora
Personal de ventas (Sales Staff)
sales tax sales tax!
Tiene mas?
Assuming the $259 price tag is with sales tax, we still couldn't answer the question - we'd need to know what the sales tax rate is where you're buying it/looking at it is. If it was, say, a 7% sales tax rate, then that would come out to $18.13 in sales tax, so the price without it would be $240.87.
Sales a las cinco?
¿Con quién sales tú?
A que hora sales?
Sales tax, of course.
Sales Tax / Sales Tax Rate = Gross Sale
6.30*8% = 6.30*0.08 = 0.504 = 0.50, say.