Iowa Department of Revenue outlines 2025 electronic filing rules, deadlines and penalties for W‑2s and 1099s

DES MOINES — Brett Park of the Iowa Department of Revenue walked payroll filers and tax professionals through the department’s electronic filing requirements for tax year 2025 W‑2 and 1099 submissions during an IASource Link webinar.

Park said Iowa requires W‑2s and 1099s that show Iowa tax withholding to be filed electronically through GovConnectIowa and that, because Feb. 15, 2026 falls on a Sunday and the following Monday is a holiday, the practical filing due date is Feb. 17, 2026. "They must be submitted electronically," Park said, urging filers to account for Iowa Code timing rules when planning submissions.

Why it matters: the department uses the data from those reports to speed individual return processing and combat fraud, and late or incorrect filings can trigger civil penalties. Park highlighted a civil penalty established in recent legislation as a $500 civil penalty to each payer for each occurrence and gave an example of a payer facing $5,000 for 10 affected employees.

Key changes and exceptions for 2025

Park said two newly introduced federal forms — the 1099‑DA (for digital‑asset brokers) and the 1042‑S (foreign persons’ U.S.‑source income subject to withholding) — are not required to be filed to Iowa in 2025 even if Iowa tax was withheld. "We are not requiring [1099‑DA] to be filed even if Iowa taxes were taken out," he said. Filers should still consult revenue.iowa.gov for the department’s published state requirements.

Formats, accepted forms and upload rules

The department follows SSA and IRS file‑layout publications (referred to in the presentation as publication 42007 for W‑2s and publication 1220 for 1099s) and requires properly formatted text files; it does not accept paper, PDFs, Excel spreadsheets, CD‑ROMs or flash drives. Park said files may be zipped but must use the correct file layout and that the upload size limit is 100 megabytes.

GovConnectIowa: manual key and file upload

Park demonstrated both the manual key option (for filers entering individual W‑2s/1099s through the GovConnectIowa interface) and the file‑upload path (for software vendors and bulk filers). He walked through connecting to the correct withholding account or permit, selecting form year (the system will accept 2023–2025 starting Jan. 1), verifying employer and employee fields, and using the confirmation/summary screens. Saved drafts persist for up to 30 days.

Corrected filings and incorrect SSNs

If a filer needs to correct an earlier submission they can use manual key or file upload regardless of how the original was filed. For an incorrect Social Security number, Park advised submitting a zero (0) record under the incorrect SSN to wipe the prior data, then resubmitting the corrected SSN and accompanying information.

Bulk filers, testing and vendor support

Organizations that file multi‑client batches may apply to be approved bulk filers on GovConnectIowa and, if approved, use the bulk filer workflow. Park urged payroll vendors and software developers to confirm they support Iowa’s file layout; many validation errors require developer fixes. The department offers a test site for vendors and provided an email address for test‑site inquiries.

Extensions, penalties and resources

A 30‑day filing extension is available if requested by the filing due date; Park said the extension must be submitted before the due date to be considered. For help, Park directed attendees to revenue.iowa.gov (file specifications, FAQs, webinar slides and recordings) and provided department contacts and GovConnectIowa messaging options for technical or filing questions.

Q&A highlights

In audience questions, Park said the department has not implemented an API for submissions at this time and reiterated procedures for obtaining access codes and connecting withholding accounts. Tara West, who assisted with Q&A, advised filers who cannot see prior submissions to contact taxpayer services so staff can check filing receipts or confirm who submitted a file.

The webinar was hosted by IASource Link in partnership with the Iowa Department of Revenue and recorded for later viewing; IASource Link will email attendance proof to participants.

Next step: filers should confirm software or vendor support for Iowa filing specifications, connect to the correct withholding account on GovConnectIowa and, if needed, apply for the 30‑day extension before the Feb. 17, 2026 due date.