Idaho W2 E-File Requirements & EFW2 Text Format | ID Tap Upload

Idaho W2 Electronic Filing Common Questions and Answers

Does Idaho mandate filing W-2s electronically?

As an Idaho employer you are only required to file electronically when you have 50 or more W2 forms. You will need to check with the state annually, since this threshold is subject to change.

What is the name of the publication that defines Idaho W2 E-Filing format and details?

Refer to "Idaho State Tax Commission W-2 E-Filing Guide".

What software can I use to generate Idaho W2 E-File submissions?

You can use our W2 Mate software to create W2 E-File submissions that comply with Idaho requirements. To learn more about W2 Mate and download a demo you can visit


Does Idaho follow the EFW2 format defined by the SSA?

Yes, Idaho follows the "Specifications for Filing Forms W-2 (EFW2)" as defined by the SSA, but the state also has its own special requirements.

How can I submit the Idaho DOR-EFW2 (W2 E-File) Withholding file attachment to Idaho?

Idaho accepts W-2 EFW2 formatted files online at Taxpayer Access Point (TAP) website, https://idahotap.gentax.com/TAP/.

Do you need to include the RV (State Total) record as part of the Idaho W2 E-File Submission?

Yes, this record is mandatory and has to be included.

Do you need to include the RS (State Wage) records as part of the Idaho W2 E-File Submission?

Yes, this record is mandatory and has to be included.

Does Idaho have a special file naming convention for W2 E-File submissions?

No, the state does not have any special requirements; however it's a good idea to have the company name included in the file name and to have .txt as the file extension.

Does Idaho have any requirements for money fields?

Money fields must contain only numbers. No punctuation. Include both dollars and cents with the decimal point assumed (example: $89.70 = 000008970). All state withholding shall be rounded to the nearest dollar. Right-justify and zero fill to the left. Any money field that has no amount to be reported must be filled with zeros, not blanks.

Does Idaho have any requirements for Social Security Number (SSN)?

Use the number shown on the original/replacement SSN card. Omit hyphens. SSNs may NOT begin with a 666 or 9. If there is no SSN available for the employee, enter zeros (0) in positions 10 - 18 of the RS Record.

How do I know if my submission was successful?

Go to tax.idaho.gov/gotoTAP and select the Submissions tab to review any submissions. If the status is processed, then your e-filing was received. If the status is submitted, then the e-filing has been

Submitted but not downloaded from TAP.

How do I contact Idaho with questions about my W2 E-File submission?

Email the E-File Help Desk at efilehelp@tax.idaho.gov or call (800) 972-7660, ext. 6632.

The electronic filing engine available inside our W2 Mate® software gives Idaho employers and tax professionals the ability to e-File W2s with both the state of Idaho and the Social Security Administration’s (SSA). To learn more about W2 Mate visit https://www.realtaxtools.com/W2-Mate.html , email sales@realtaxtools.com or call 1-800-507-1992. 

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