U.S. travelers who will need a new passport in 2018 can potentially save themselves  $10 if they apply before an increase of a  fee on  April 2.

The  State Department has announced that "execution fees" will increase from $25 to $35. The execution fee is charged to people who apply in person at  an official passport agency, such as a post office, county courthouse, or library. The fee increase will not apply to individuals who renew passports by mail.

The fee change will bump the total cost of a U.S. passport to $145 for adults and $115 for children ages 16 and younger.

Passport execution fees are set at a rate that will allow for the "recovery of the costs to the U.S. government of providing the consular service," according to the State Department. Processing costs are now higher than the $25 fee, prompting the increase.

Information on U.S. passports is available at travel.state.gov.