descontar

To deduct or subtract, most often money: descontar un porcentaje, descontar los gastos. The fixed phrase dar algo por descontado ('to take something for granted') is extremely common and worth learning as a unit — it doesn't literally mean 'to discount' in that context.

• Nos descontaron el diez por ciento por pago anticipado. — They deducted ten percent for early payment.
• Doy por descontado que vendrás a la fiesta. — I take it for granted that you'll come to the party.
• Hay que descontar los días festivos del cálculo. — You have to subtract the holidays from the calculation.

Don't confuse descontar (to deduct) with contar (to count) or with the false-friend pull of English 'discount' as a noun — descontar is the verb for the action, while the store sign 'on sale' is more often en oferta or con descuento.

• expression tiempo de descuento — The everyday term Spanish-speaking football commentators and fans use for stoppage/added time at the end of a half — even though the sport's official Laws of the Game never use the word descuento, referring instead to tiempo añadido or adicional.