Learn Spanish (Latin America): No tenemos ningún descuento hoy.

Ninguno drops its final -o and becomes ningún whenever it comes directly before a masculine singular noun. Since descuento (discount) is a masculine singular noun, we must use ningún.

Why is descuento singular here when the English translation says "any discounts" in the plural?

In Spanish, when you are saying there are zero of something, you almost always use the singular form of the noun along with ningún or ninguna. So, ningún descuento literally means "not a single discount," which sounds best as "any discounts" in English.

Is No tenemos ningún descuento a double negative?

Yes, it literally translates to "We don't have no discount." Unlike English, Spanish requires double negatives. When a negative word like ningún comes after the verb, you must also put no before the verb.

Why does ningún have an accent mark over the 'u' when ninguno does not?