What is deep discount debt? When should expenditures for debt service on zero coupon bonds be reported?

Question:

What is “deep discount debt”? When should expenditures for debt service on zero bonds be reported?

Coupon
A coupon or coupon payment is the annual interest rate paid on a bond, expressed as a percentage of the face value and paid from issue date until maturity. Coupons are usually referred to in terms of the coupon rate (the sum of coupons paid in a...