laskun

Laskun is the genitive singular of the Finnish noun lasku, which most commonly means a bill or invoice, but can also refer to a calculation or reckoning. The form laskun is used to indicate possession or association with lasku, as in laskun summa (the amount of the bill), laskun numero (the invoice number), or laskun eräpäivä (the due date of the invoice).

Etymology and grammar: Lasku derives from the verb laskea, meaning to count, calculate, or put down in writing. The genitive suffix -n attaches to form laskun, to express that something belongs to or relates to the bill. In everyday Finnish, lasku is most often encountered in the context of payments and invoicing, but the word can also denote a calculation or accounting record in older or broader uses.

Usage and context: In modern use, lasku refers primarily to a bill sent to a customer or a request for payment. An invoice typically contains the seller and buyer information, itemized charges, tax details, the total amount due, payment instructions, and the due date. Phrases such as laskun lähettäminen (sending the invoice) and laskun maksaminen (payment of the invoice) are common. The genitive laskun appears widely in compound phrases that describe attributes of the bill, such as laskun päivämäärä, laskun loppusumma, or laskun tila.

Related terms include laskutus (invoicing or billing) and laskenta (calculation). Laskun remains the standard form when referring to a specific bill or to aspects tied to that bill.