Roughly fifteen months after the Durbin amendment went into effect, the controversial legislation that capped debit card interchange for issuers with over $10 billion in assets has painted a mixed picture for most credit unions.

Regulations implementing the Durbin amendment came into effect Oct. 1, 2011.

In the shadowed part of the picture, interchange rates per debit card transaction appear to be definitely falling, according to payment processor and CUSO executives who track debit trends. In the lighter part of the image, overall debit interchange income has not fallen as much or has actually risen as credit unions added more debit cards or enacted programs to hike debit card usage.