The mileage rates used to calculate deductible costs for operating automobiles for business, medical and moving purposes will drop next year. The Internal Revenue Service has issued the rates for those purposes and for miles driven in service of charitable organizations beginning January 1.

Tax season will begin on January 23 when the Internal Revenue Service begins accepting electronic returns and processing paper ones. The IRS expects more than 153 million individual tax returns to be filed this year. They are due on or before April 18.

Deltek, which markets software to a variety of professional services, is being acquired by Roper International. Roper will buy the company from investment firm Thoma Bravo for $2.8 billion in a deal expected to close by the end of the year. Deltek will continue to operate under its own name and management.