BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Kintsugi//Sales Tax Due Dates//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Illinois sales tax due dates
X-WR-CALDESC:Generated from Kintsugi's state-by-state due date data (verifi
 ed Sep 26\, 2026). Dates follow each state's weekend rule and federal holi
 days\; confirm with the state before filing.
BEGIN:VEVENT
UID:il-monthly-2026-10-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20261020
DTEND;VALUE=DATE:20261021
SUMMARY:Illinois sales tax return due: Monthly (September 2026)
DESCRIPTION:Illinois monthly return for September 2026.\nWho files monthly:
  Default\; average monthly liability greater than $200.\nSource: https://t
 ax.illinois.gov/research/publications/pubs/retailers-overview-of-sales-and
 -use-tax/requirements-for-retailers-who-file-form-st-1.html\nAlways confir
 m with the Illinois Department of Revenue before you file.\nKintsugi files
  and remits for you: https://trykintsugi.com/product/sales-tax-filing-soft
 ware
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-quarterly-2026-10-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20261020
DTEND;VALUE=DATE:20261021
SUMMARY:Illinois sales tax return due: Quarterly (Jul–Sep 2026)
DESCRIPTION:Illinois quarterly return for Jul–Sep 2026.\nWho files quarte
 rly: IDOR may assign when average monthly liability is $50 to $200.\nSourc
 e: https://tax.illinois.gov/research/publications/pubs/retailers-overview-
 of-sales-and-use-tax/requirements-for-retailers-who-file-form-st-1.html\nA
 lways confirm with the Illinois Department of Revenue before you file.\nKi
 ntsugi files and remits for you: https://trykintsugi.com/product/sales-tax
 -filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-monthly-2026-11-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20261120
DTEND;VALUE=DATE:20261121
SUMMARY:Illinois sales tax return due: Monthly (October 2026)
DESCRIPTION:Illinois monthly return for October 2026.\nWho files monthly: D
 efault\; average monthly liability greater than $200.\nSource: https://tax
 .illinois.gov/research/publications/pubs/retailers-overview-of-sales-and-u
 se-tax/requirements-for-retailers-who-file-form-st-1.html\nAlways confirm 
 with the Illinois Department of Revenue before you file.\nKintsugi files a
 nd remits for you: https://trykintsugi.com/product/sales-tax-filing-softwa
 re
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-monthly-2026-12-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20261221
DTEND;VALUE=DATE:20261222
SUMMARY:Illinois sales tax return due: Monthly (November 2026)
DESCRIPTION:Illinois monthly return for November 2026.\nThe statutory due d
 ate\, Dec 20\, 2026\, falls on a weekend or federal holiday\, so it moves 
 to the next business day.\nWho files monthly: Default\; average monthly li
 ability greater than $200.\nSource: https://tax.illinois.gov/research/publ
 ications/pubs/retailers-overview-of-sales-and-use-tax/requirements-for-ret
 ailers-who-file-form-st-1.html\nAlways confirm with the Illinois Departmen
 t of Revenue before you file.\nKintsugi files and remits for you: https://
 trykintsugi.com/product/sales-tax-filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-annual-2027-01-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270120
DTEND;VALUE=DATE:20270121
SUMMARY:Illinois sales tax return due: Annual (2026)
DESCRIPTION:Illinois annual return for 2026.\nWho files annual: IDOR may as
 sign when average monthly liability is less than $50.\nSource: https://tax
 .illinois.gov/research/publications/pubs/retailers-overview-of-sales-and-u
 se-tax/requirements-for-retailers-who-file-form-st-1.html\nAlways confirm 
 with the Illinois Department of Revenue before you file.\nKintsugi files a
 nd remits for you: https://trykintsugi.com/product/sales-tax-filing-softwa
 re
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-monthly-2027-01-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270120
DTEND;VALUE=DATE:20270121
SUMMARY:Illinois sales tax return due: Monthly (December 2026)
DESCRIPTION:Illinois monthly return for December 2026.\nWho files monthly: 
 Default\; average monthly liability greater than $200.\nSource: https://ta
 x.illinois.gov/research/publications/pubs/retailers-overview-of-sales-and-
 use-tax/requirements-for-retailers-who-file-form-st-1.html\nAlways confirm
  with the Illinois Department of Revenue before you file.\nKintsugi files 
 and remits for you: https://trykintsugi.com/product/sales-tax-filing-softw
 are
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-quarterly-2027-01-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270120
DTEND;VALUE=DATE:20270121
SUMMARY:Illinois sales tax return due: Quarterly (Oct–Dec 2026)
DESCRIPTION:Illinois quarterly return for Oct–Dec 2026.\nWho files quarte
 rly: IDOR may assign when average monthly liability is $50 to $200.\nSourc
 e: https://tax.illinois.gov/research/publications/pubs/retailers-overview-
 of-sales-and-use-tax/requirements-for-retailers-who-file-form-st-1.html\nA
 lways confirm with the Illinois Department of Revenue before you file.\nKi
 ntsugi files and remits for you: https://trykintsugi.com/product/sales-tax
 -filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-monthly-2027-02-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270222
DTEND;VALUE=DATE:20270223
SUMMARY:Illinois sales tax return due: Monthly (January 2027)
DESCRIPTION:Illinois monthly return for January 2027.\nThe statutory due da
 te\, Feb 20\, 2027\, falls on a weekend or federal holiday\, so it moves t
 o the next business day.\nWho files monthly: Default\; average monthly lia
 bility greater than $200.\nSource: https://tax.illinois.gov/research/publi
 cations/pubs/retailers-overview-of-sales-and-use-tax/requirements-for-reta
 ilers-who-file-form-st-1.html\nAlways confirm with the Illinois Department
  of Revenue before you file.\nKintsugi files and remits for you: https://t
 rykintsugi.com/product/sales-tax-filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-monthly-2027-03-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270322
DTEND;VALUE=DATE:20270323
SUMMARY:Illinois sales tax return due: Monthly (February 2027)
DESCRIPTION:Illinois monthly return for February 2027.\nThe statutory due d
 ate\, Mar 20\, 2027\, falls on a weekend or federal holiday\, so it moves 
 to the next business day.\nWho files monthly: Default\; average monthly li
 ability greater than $200.\nSource: https://tax.illinois.gov/research/publ
 ications/pubs/retailers-overview-of-sales-and-use-tax/requirements-for-ret
 ailers-who-file-form-st-1.html\nAlways confirm with the Illinois Departmen
 t of Revenue before you file.\nKintsugi files and remits for you: https://
 trykintsugi.com/product/sales-tax-filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-monthly-2027-04-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270420
DTEND;VALUE=DATE:20270421
SUMMARY:Illinois sales tax return due: Monthly (March 2027)
DESCRIPTION:Illinois monthly return for March 2027.\nWho files monthly: Def
 ault\; average monthly liability greater than $200.\nSource: https://tax.i
 llinois.gov/research/publications/pubs/retailers-overview-of-sales-and-use
 -tax/requirements-for-retailers-who-file-form-st-1.html\nAlways confirm wi
 th the Illinois Department of Revenue before you file.\nKintsugi files and
  remits for you: https://trykintsugi.com/product/sales-tax-filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-quarterly-2027-04-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270420
DTEND;VALUE=DATE:20270421
SUMMARY:Illinois sales tax return due: Quarterly (Jan–Mar 2027)
DESCRIPTION:Illinois quarterly return for Jan–Mar 2027.\nWho files quarte
 rly: IDOR may assign when average monthly liability is $50 to $200.\nSourc
 e: https://tax.illinois.gov/research/publications/pubs/retailers-overview-
 of-sales-and-use-tax/requirements-for-retailers-who-file-form-st-1.html\nA
 lways confirm with the Illinois Department of Revenue before you file.\nKi
 ntsugi files and remits for you: https://trykintsugi.com/product/sales-tax
 -filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-monthly-2027-05-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270520
DTEND;VALUE=DATE:20270521
SUMMARY:Illinois sales tax return due: Monthly (April 2027)
DESCRIPTION:Illinois monthly return for April 2027.\nWho files monthly: Def
 ault\; average monthly liability greater than $200.\nSource: https://tax.i
 llinois.gov/research/publications/pubs/retailers-overview-of-sales-and-use
 -tax/requirements-for-retailers-who-file-form-st-1.html\nAlways confirm wi
 th the Illinois Department of Revenue before you file.\nKintsugi files and
  remits for you: https://trykintsugi.com/product/sales-tax-filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-monthly-2027-06-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270621
DTEND;VALUE=DATE:20270622
SUMMARY:Illinois sales tax return due: Monthly (May 2027)
DESCRIPTION:Illinois monthly return for May 2027.\nThe statutory due date\,
  Jun 20\, 2027\, falls on a weekend or federal holiday\, so it moves to th
 e next business day.\nWho files monthly: Default\; average monthly liabili
 ty greater than $200.\nSource: https://tax.illinois.gov/research/publicati
 ons/pubs/retailers-overview-of-sales-and-use-tax/requirements-for-retailer
 s-who-file-form-st-1.html\nAlways confirm with the Illinois Department of 
 Revenue before you file.\nKintsugi files and remits for you: https://tryki
 ntsugi.com/product/sales-tax-filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-monthly-2027-07-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270720
DTEND;VALUE=DATE:20270721
SUMMARY:Illinois sales tax return due: Monthly (June 2027)
DESCRIPTION:Illinois monthly return for June 2027.\nWho files monthly: Defa
 ult\; average monthly liability greater than $200.\nSource: https://tax.il
 linois.gov/research/publications/pubs/retailers-overview-of-sales-and-use-
 tax/requirements-for-retailers-who-file-form-st-1.html\nAlways confirm wit
 h the Illinois Department of Revenue before you file.\nKintsugi files and 
 remits for you: https://trykintsugi.com/product/sales-tax-filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-quarterly-2027-07-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270720
DTEND;VALUE=DATE:20270721
SUMMARY:Illinois sales tax return due: Quarterly (Apr–Jun 2027)
DESCRIPTION:Illinois quarterly return for Apr–Jun 2027.\nWho files quarte
 rly: IDOR may assign when average monthly liability is $50 to $200.\nSourc
 e: https://tax.illinois.gov/research/publications/pubs/retailers-overview-
 of-sales-and-use-tax/requirements-for-retailers-who-file-form-st-1.html\nA
 lways confirm with the Illinois Department of Revenue before you file.\nKi
 ntsugi files and remits for you: https://trykintsugi.com/product/sales-tax
 -filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-monthly-2027-08-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270820
DTEND;VALUE=DATE:20270821
SUMMARY:Illinois sales tax return due: Monthly (July 2027)
DESCRIPTION:Illinois monthly return for July 2027.\nWho files monthly: Defa
 ult\; average monthly liability greater than $200.\nSource: https://tax.il
 linois.gov/research/publications/pubs/retailers-overview-of-sales-and-use-
 tax/requirements-for-retailers-who-file-form-st-1.html\nAlways confirm wit
 h the Illinois Department of Revenue before you file.\nKintsugi files and 
 remits for you: https://trykintsugi.com/product/sales-tax-filing-software
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
BEGIN:VEVENT
UID:il-monthly-2027-09-20@trykintsugi.com
DTSTAMP:20260926T000000Z
DTSTART;VALUE=DATE:20270920
DTEND;VALUE=DATE:20270921
SUMMARY:Illinois sales tax return due: Monthly (August 2027)
DESCRIPTION:Illinois monthly return for August 2027.\nWho files monthly: De
 fault\; average monthly liability greater than $200.\nSource: https://tax.
 illinois.gov/research/publications/pubs/retailers-overview-of-sales-and-us
 e-tax/requirements-for-retailers-who-file-form-st-1.html\nAlways confirm w
 ith the Illinois Department of Revenue before you file.\nKintsugi files an
 d remits for you: https://trykintsugi.com/product/sales-tax-filing-softwar
 e
URL:https://trykintsugi.com/sales-tax-due-dates#illinois
TRANSP:TRANSPARENT
END:VEVENT
END:VCALENDAR