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Knowledge Base

Electronic Filling

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Why should I file my return electronically?

It’s fast, easy, secure, convenient, accurate, and hassle free. In most situations, the Illinois Department of Revenue (IDOR) requires taxpayers to file and pay their taxes electronically. You will need to check with IDOR to determine how this mandate governs your particular situation.


Do I need to register with IDOR to file returns electronically?

Yes. Any business wishing to enroll in the Illinois Department of Revenue’s (IDOR) business electronic filing and payment programs must complete Form IL-8633-B Business Electronic Filing Enrollment. Our PAVLOU SalesTaxPRO automatically prepares this enrollment form for you during the Company Setup stage, as you enter your company’s information. All you have to do is enter your Signature Code on Line 14, print , sign and mail it to the:

PO BOX 19479


What’s a Signature Code?

A signature code is the code that represents your signature. It could be a combination of any alpha-numeric 6 digits. Examples could be A29J43, 12345B, ASAP22, 133LKJ, 824355, FDERWS, or any desired combination.


What if I want to make revisions to Form IL-8633-B on a later date?

If you need to change information provided in a previous enrollment, you must complete a Revised form IL-8633-B.


What if I have questions about the form for electronic filing enrollment?

If you have questions, you can call the Springfield Office at:
(217) 785-5739
(866) 440-8680

or write to:
P.O. BOX 19030

or contact the Central Registration Division by e-mailing them at:

or calling them at
(217) 785-3707


Where should I file the enrollment form?

Form IL-8633-B must be mailed to:

P.O. BOX 19479
SPRINGFIELD, IL 62794-9479


Can I submit my electronic enrollment form via the internet?

No. The Illinois Department of Revenue does not yet have the internet capability to process this type of registration.


How do I get a PIN number for Sales Tax Electronic Filing?

It’s possible the Illinois Department of Revenue has already sent out communications (Letter-225) letting you know a PIN has been assigned to you. The PIN is a four digit number and along with your IBT number will serve as your signature for electronic filing purposes.


What if I lose my PIN?

If you lose your PIN you must contact IDOR. The telephone numbers are:

1-800-732-8866 – FREE


1-217-782-3336 – FREE


How often must I file my tax return?

The Illinois Department of Revenue (IDOR) determines how often you must file a return based on your initial registration and annual liability. Filing requirements based on your average monthly liability are determined as follows:

If your average monthly liability is:

  • greater than $200, the department may notify you that your fi ling frequency has been changed to a monthly requirement.
  • between $50 and $200, the department may notify you that your fi ling frequency has been changed to a quarterly requirement.
  • less than $50, the department may notify you that your fi ling frequency has been changed to an annual requirement.


How do I correct an error if I file my return electronically?

You can resend another transmission with the corrected data within 24 hours from the time the original transmission went out. If you are beyond the 24-hour requirement, you cannot amend your return through electronic filing. You must file a paper Form ST-1-X, Amended Sales and Use Tax Return, to correct any errors you discover subsequent to the filing.


What options are available to make my payments electronically?

You have two options for making your payments electronically. First, the ACH Credit Option requires a pre-notification transaction to be processed at least 10 business days before the first remittance payment. Second, the ACH Debit option does not require preregistration with IDOR. See Form EFT-1 for more information and specifics.


How do I know if the return I file electronically was filed successfully?

When the Illinois Gateway receives a file (return) successfully, it returns a formatted acknowledgment of the successful transmission and this may serve as your officially timed & stamped receipt for the transmission. If any errors are encountered during the transmission, the Gateway transmits a fault message to the transmitter with an explanation. This explanation will be reported in the Client List under the column of E-Filing Status for easy access and monitoring.


What if my computer failed before IDOR was able to accept my return(s)?

If the PAVLOU SalesTaxPRO® client (from your computer) was able to successfully transmit the return(s) to the PAVLOUSalesTaxPRO® servers, you do not have to resend the return(s). The PAVLOU SalesTaxPRO® client does not have to be connected to the internet for the returns to be submitted to IDOR. The servers will automatically handle all processing. When power is restored to your PC and you run the PAVLOU SalesTaxPRO® client at a later time, you can click on the “check return status” button to retrieve the status of your return(s) from the PAVLOU SalesTaxPRO® servers. In any rate, if you run into any of the above problems, your best avenue is to contact us via email.  Please remember to reference your license key in your request.  Our Support Team will contact you with instructions and updated status information.


Are there any additional requirements for electronic filing?

Yes. In addition to the requirements to run our PAVLOU SalesTaxPRO® products, you will need (1) an internet connection and (2) a valid credit card to submit a return(s).


What is the fee for E-File?

The E-File fee is $9.95 for each ST-1 and $6.95 for each ST-2. PTP Oneclick, LLC reserves the right to change its pricing.  All current users will be properly and timely notified of any pricing changes.


How long will it take to electronically file my return?

There are several factors that affect how long it will take to submit a return. Some of these factors include:

  • The speed of your internet connection
  • Internet congestion
  • The current load on the PAVLOU SalesTaxPRO® servers
  • The current load on the IDOR servers (the number of users simultaneously E-Filing returns)


I am e-filing my return(s). When does my credit card get charged?

When you submit a return for electronic filing, a hold is put on your credit card when your return(s) is successfully submitted to our servers. Once IDOR accepts your return(s), the hold on your credit card is converted into a normal charge.


I am submitting multiple returns at once. Will I be charged separately for each return?

No. Your credit card will be charged once for each transmission, no matter how many returns are contained in that transmission.


My return(s) was rejected by IDOR. Will my credit card be charged?

No. A hold transaction for the electronic filing fee was placed on your credit card account when you submitted your return(s). When IDOR rejected your return(s), the hold transaction was voided. You will not see an entry on your credit card statement.


If the E-File servers are compromised, can my credit card information be stolen?

The PAVLOU SalesTaxPRO® servers don’t keep your credit card information for future reference. The credit card information is stored only during the time required to submit a transaction. After that, only the last four digits of your credit card number are retained.


Can I file the local returns electronically?

No. The local returns supported by our program are signature ready forms approved for filing that you can print and file with the local tax authorities.