Document and Entity Information	Total
Prospectus:
Document Type	497
Document Period End Date	Jul. 30, 2020
Entity Registrant Name	SUNAMERICA INCOME FUNDS
Entity Central Index Key	0000795307
Entity Inv Company Type	N-1A
Amendment Flag	false
Document Creation Date	Jul. 30, 2020
Document Effective Date	Jul. 30, 2020
Prospectus Date	Jul. 29, 2020
AIG Flexible Credit Fund \| Class W
Prospectus:
Trading Symbol	SHNWX
AIG Flexible Credit Fund \| Class C
Prospectus:
Trading Symbol	SHNCX
AIG Flexible Credit Fund \| Class A
Prospectus:
Trading Symbol	SHNAX
AIG Strategic Bond Fund \| Class W
Prospectus:
Trading Symbol	SDIWX
AIG Strategic Bond Fund \| Class C
Prospectus:
Trading Symbol	NAICX
AIG Strategic Bond Fund \| Class B
Prospectus:
Trading Symbol	SDIBX
AIG Strategic Bond Fund \| Class A
Prospectus:
Trading Symbol	SDIAX
AIG U.S. Government Securities Fund \| Class C
Prospectus:
Trading Symbol	NASBX
AIG U.S. Government Securities Fund \| Class A
Prospectus:
Trading Symbol	SGTAX

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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