Day-fine
（重定向自Unit fine）
![Both police and the Finnish Border Guard can make a formal demand for fining a person or order a petty fine.](/Images/godic/202502/18/Poliiseja_ja_rajavartijoita_partioveneellä3132.jpg")
![Finnish prosecutors have considerable judicial power in deciding fines. Here, prosecutors are arriving at a court of law.](/Images/godic/202502/18/Valtionsyyttäjä_Ari_Kuusimäki_ja_kihlakunnansyyttäjät_Johanna_Hervonen_sekä_Tommi_Hietanen3132.jpg")
A day-fine or day fine or unit fine is a unit of fine payment that, above a minimum fine, is based on the offender's daily personal income. A crime is punished with incarceration for a determined number of days, or with fines. As incarceration is a financial punishment, in the effect of preventing work, a day-fine represents one day incarcerated and without salary. It is argued to be just, because if both high-income and low-income population are punished with the same jail time, they should also be punished with a proportionally similar income loss. An analogy may be drawn with income tax, which is also proportional to the income, even progressively.