The Cook Islands National Superannuation Fund has been getting a better response from employers after it began charging them a penalty fee for late payments.
The fee is allowed for under the National Superannuation Act.
The Chief executive, Anne Herman, says her office began sending letters to members in March, advising of the impending fee.
She says since then the Fund has seen an improvement in the timeliness of payments made.
In March only 54 percent of payments were on time but by April this figure was up to 91 percent.
The fund is collecting more than half a million US dollars a month.