Substitute 2023 Form IL-505-I instructions

Prepare each IL-505-I form with the following information:
 (1)  Software/Forms Developer ID Number
 (2)   Primary’s Social Security Number (SSN)
 (3)    Primary SSN Check Digit (See detailed instructions below.)
 (4)    Taxpayer’s Post - the first four letters of the taxpayer’s last name
 (5)    Spouse’s SSN
 (6)    Spouse SSN Check Digit (See detailed instructions below.)
 (7)    Account Period Ending Month
 (8)    Account Period Ending Year
 (9)    Taxpayer’s Name and Address
 (10)  Amount of Payment. The payment amount field must show dollars and two positions for cents. 
      (Whole dollars only)
 (11)  Preparer’s Phone Number
 (12)  Scan Line (See detailed instructions below.)
 (13)  1D Barcode (See detailed instructions on the following page.)
SSN Check Digit Formula
  The check digit is figured from the following calculations.
  EXAMPLE: SSN = 0 0 0 3 4 7 6 3 1
  Step 1: Beginning at the left most digit, multiply each digit of the SSN alternating by 2 and then 1.
                        0         0          0          3          4          7          6          3           1
             X        2         1          2          1          2          1          2          1           2

             =          0         0          0          3          8          7        12          3           2
  Step 2: Add any two‑digit number in the products together to obtain one digit. (The total of the two digit 12 is 3). 
  Step 3: Add the Step 1 products together substituting the one‑digit number found in Step 2 for the two‑digit number.
      0 + 0 + 0 + 3 + 8 + 7 + 3 + 3 + 2 = 26.
  Step 4: Determine the unit (ones) position of the result of Step 3. The unit position of 26 is 6.
  Step 5: If the result of Step 3 is zero, then zero is the check digit. Otherwise, subtract the result of Step 4 from 10.
      The result is the check digit.  10 ‑ 6 = 4.  4 is the check digit.

Scan Line Placement and Contents
  The scan line must be centered horizontally on the page (the center of the scan line must be at 4.25 inches) and must fall 
  between .25 and .375 inches from the bottom edge of the form. There must be only the scan line in the bottom .5 inch of 
  the form.
  Contents: The scan line contains 39 positions as described below. The font for the scan line is “OCR‑A Std”, size 10.
      Positions within the scan line:
             1          Voucher Number is always 5
             2          Space
             3 ‑ 11    Primary’s SSN
             12         Space
             13         Primary SSN Check Digit (See formula above.)
             14         Space
             15 ‑ 22  Numeric Post  (See formula on the following page.)
             23         Space
             24 ‑ 32  Spouse’s SSN
             33         Space
             34         Spouse SSN Check Digit (See formula above.)
             35         Space
             36 ‑ 39  Account Period Ending (APE). Fill with the last month and year of the tax year being paid (mmyy).
                        Example: December 2023 is 1223.

IL‑505‑I SPECS (R‑12/23)
Printed by authority of the State of Illinois, electronic only, one copy.                                                                                  Page 1 of 3

                    Substitute Form IL-505-I instructions (continued)

Numeric Post Formula
          Determine the numeric post from the first four letters of taxpayer’s last name. The numeric post is calculated by num‑
     bering the alphabet from 01 ‑ 26 beginning with the letter A as 01, B as 02, and so on.

          Numeric post examples and special rules:
          • For a last name Jones = JONE = the numeric post is 10151405
          • For a last name that is less than four characters, fill each ending space with 00.  Last name of Coe = COE = the 
            numeric post is 03150500
          • For a last name containing an apostrophe or hyphen, omit the punctuation. Last name of O’Connor = OCON = the 
            numeric post is 15031514
          • For a last name containing a space, omit the space. Last name of De Von = DEVO = the numeric post is 
            04052215

1-D Barcode
     1‑D Barcode font is “Free 3 of 9 Extended”, size 30 pt (height around 5/16 inch), and the content is *71212231V* on the 
     voucher. There must be at least 1/4 inch quiet zone (white space) around the barcode.

Important: Electronic payments are required if the taxpayer’s previous year’s annual liability was $200,000 or more.

          Below is an example of the payment voucher with the required preprinted fields. (Do not 
          reproduce the red numbered notes. They are provided for reference.) Email five drafts for 
          testing and review to REV.VendorForms@illinois.gov.

 IL‑505‑I (R‑12/23) 

          Illinois Department of Revenue
                                     ID: 123
          IL-505-I   2023                    (1)
          Automatic Extension Payment for Individuals
                                                                                                                                                                            Official Use 
  Enter your Social Security numbers in the order they appear on your federal return.                         Do not file this form if no payment is due or you pay    
                    (2)        (3)            (4)                                (5)       (6)             electronically or by credit card.
000-34-7631     *4*    JONE          000-34-8787     *3*
Your Social Security number          Spouse’s Social Security number                                                                                             (7)         (8)
                                                                                                        For calendar year ending                                                            
                                                                                                        12/23 or fiscal year ending                                  12   / 23
                                                                                                                                                                 Month and year 
(9)
       John and Annie Jones                                                                                                                        (10)
       1234 Folks Place                                                                                                 $ _____________500   _____00
                                                                                                                                                   Tentative tax due (Whole dollars. only) 
       Anywhere IL  12345-1234                                                                                Make your check or money order payable to and mail 
     (11)                                                                                                     to: 
Daytime phone number  (555) 123‑1234                                                                          ILLINOIS DEPARTMENT OF REVENUE
                                                                                                              PO BOX 19005
 IL‑505‑I (R‑12/23)                  (13)                                                                     SPRINGFIELD IL  62794–9005 
                                          *71212231V*

                            (12)
                                5 000347631 4 10151405 000348787 3 1223