| Title, Format | Label | Cat# | Country | Year | |
|---|---|---|---|---|---|
| I.O.U. (12") | Streetwise | SWRL 2210 | US | 1983 | |
| I.O.U. (12", Promo) | Streetwise | SWRL 2210 | US | 1982 | |
| I.O.U. (Megamix) (12") | Virgin, Virgin Schallplatten GmbH | 600 902, 600 902-213 | Germany | 1983 | |
| I.O.U. (Megamix) (12") | Powderworks | POWT 0146 | Australia | 1983 | |
| I.O.U. (Megamix) (12") | Beggars Banquet | F-600902 | Spain | 1983 | |
| I.O.U. (Megamix) (12") | Virgin | 600 902 | France | 1983 | |
| I.O.U. (Megamix) (12") | Virgin | F-600.902 | Spain | 1983 | |
| I.O.U. (Megamix) (12", Gen) | Beggars Banquet | BEG 96(T) | UK | 1983 | |
| I.O.U. (Megamix) (12", Maxi) | Beggars Banquet | BEG 96TA | UK | 1983 | |
| I.O.U. (Megamix) (12", Pic) | Beggars Banquet, Beggars Banquet | BEG 96(T), BEG 96T | UK | 1983 | |
| I.O.U. (12") | Vertigo | SOVX 2327 | Canada | 1983 | |
| I.O.U. (12") | Streetwise | SWRL 2210 | US | 1983 | |
| I.O.U. (7") | Virgin Schallplatten GmbH | 105 535 | Germany | 1983 | |
| I.O.U. (7") | Streetwise | SWRL-1110 | US | 1983 | |
| I.O.U. (7") | Victor Musical Industries | VIPX-1742 | Japan | 1983 | |
| I.O.U. (7") | Powderworks, Beggars Banquet | POW 0146 | Australia | 1983 | |
| I.O.U. (7", Single) | Beggars Banquet | BEG 96 | UK | 1983 | |
| I.O.U. (7", Single) | Virgin | 105 535 | Netherlands | 1983 | |
| I.O.U. (7", Single) | Virgin, Ariola Eurodisc S.A. | B-105.535 | Spain | 1983 | |
| I.O.U. (12") | Criminal Records | CRIM 00007 | US | 1986 | |
| I.O.U. (12", Promo) | Criminal Records | CRIM 00007 | US | 1986 | |
| I.O.U. (The Ultimate Mixes '87) (12") | City Beat | CBE 1209 | UK | 1987 | |
| I.O.U. (The Ultimate Mixes '87) (12") | Beat Box (Sweden) | BB 8105 | Sweden | 1987 | |
| I.O.U. (The Ultimate Mixes '87) (12") | Virgin France S.A. | 80291 | France | 1987 | |
| I.O.U. (The Ultimate Mixes '87) (12", Single) | Virgin Schallplatten GmbH | 608 897-213 | Germany | 1987 | |
| I.O.U. (The Ultimate Mixes '87) (12", W/Lbl) | Not On Label | none | UK | 1987 | |
| I.O.U. (The Ultimate Mixes '87) (7") | Beat Box (Sweden) | BB 7105 | Sweden | 1987 | |
| I.O.U. (The Ultimate Mixes '87) (7", Single) | City Beat | CBE 709 | UK | 1987 | |
| I.O.U. (12", Promo) | Virgin France S.A. | VISA 8312 | France | 1997 | |
| I.O.U. - Romanthony Mixes Part 2 (12") | Labels | 7243 8 95682 6 4 | France | 1999 | |
| I.O.U. (12") | Virgin France S.A. | 7243 8 95667 6 5 | France | 1999 | |
| I.O.U. (CD, Maxi) | Labels | 7243 8 95667 2 7 | France | 1999 | |
| I.O.U. (CD, Maxi) | Rams Horn Records | RHR 03-4314-8 | Netherlands | 1999 | |
| I.O.U. (12", RE) | Warlock Classics | WAR-802 | US | ||
| I.O.U. (CD, Maxi) | Warlock Classics | WARCD-802 | US |
referencing I.O.U., 12", SWRL 2210