X0102 24F-2NT LIVE 0000820892 XXXXXXXX N-1A NUVEEN INVESTMENT FUNDS INC 333 West Wacker Drive Chicago IL X1 60606 Nuveen Strategic Income Fund S000005573 C C000015187 R6 C000151934 I C000015189 A C000015185 811-05309 033-16905 08/31/2025 false false S000005573 509219713 278903803.33 164613235.06 443517038.39 65702674.61 0 0.0001381 9073.54 0 9073.54 Geoffrey Noyes MD Performance & Reporting, Fund Administration 11/24/2025 NUVEEN INVESTMENT FUNDS INC 333 West Wacker Drive Chicago IL X1 60606 Nuveen Credit Income Fund S000005544 I C000015080 A C000015076 C C000015078 811-05309 033-16905 08/31/2025 false false S000005544 204114406.15 59859310.3 738686558.06 798545868.36 0 (594431462.21) 0.0001381 0 0 0 Geoffrey Noyes MD Performance & Reporting, Fund Administration 11/24/2025