As the population rises in a district so does the amount of money that a levy will collect.  In order to receive the added money because of increases in value, the district changes the levy to renewal with an increase.  Using this instead of a replacement will allow the levy to still receive rollback money from the state, EXCEPT for the increase portion of the levy.

More info...

Previous year's forms can be accessed from Ohio Department of Taxation.

Notice: DTE1 must be submitted between Jan 1 and Mar 31 of any given year by Ohio Revised Code.