The £150 will be paid following completion of all residential mortgage applications submitted during the month of January 2016.
The cashback is available across the entire residential range, including fee-free, fixed rates, trackers, discount and offset mortgages.
Hinckley & Rugby chief executive, Chris White, said:
“We marked our 150th for our savers in 2015 with a special high interest loyalty bond, now it’s the turn of mortgage applicants. The £150 cashback is the icing on our birthday cake.”