A Japanese lender has an unusual plan to help prop up slumping birth rates in the country.

Local Japanese lender Gunma bank is introducing an allowance for staff who have large families: the local lender is offering up to 2 million yen ($18,320) for parents who have more than one child, «Nikkei Asian Review» reported.

Temporary bank staff can also cash in on their kids, and the bank will even throw in five extra days annual leave for fertility treatment.

Japan's birth rates are dropping, posing a serious economic threat. Gunma is introducing a scaled system for its staff: the more children, the larger the allowance.

A second child is worth a 200,000 yen lump sum, a third a total of 1 million yen spread out over five years, and the 2 million yen kicks on for families with four or more children.