also: りふだ
noun
interest coupon
A detachable coupon attached to a bond or debenture, used to claim interest payments. Primarily a financial term.
この債券には利札が付いているので、定期的に利息を受け取れます。
This bond comes with interest coupons, so you can receive interest payments periodically.
クーポン is a broader term for any coupon or voucher, while 利札 specifically refers to an interest coupon on a financial instrument.
Compound of 利 (interest) and 札 (tag, slip). The reading りさつ is the on'yomi combination; りふだ mixes on'yomi and kun'yomi.