Environment Minister Mark H Durkan has announced the fee for car and motorcycle theory tests will fall by £5 from October, taking the cost of a test from £30 to £25.
The fee will be reduced by a further £2 in October next year.
Theory test fees for other categories of vehicle will also be reduced.
Announcing the reduction, Mr Durkan said: “By agreeing new contract arrangements for the delivery of theory tests I have secured significant cost savings.
“I believe it is both right and proper that I pass these savings on to our customers.”
The Minister concluded: “It is my intention to ensure that my Department’s services are delivered in such a way that they meet customers’ needs at the least cost possible.”