Every Indiana employer registered to withhold state or county income tax must file Form WH-3, the Annual Withholding Reconciliation, by January 31 following the tax year, along with state copies of every W-2, W-2G, and 1099 that reports Indiana withholding. The Indiana WH-3 filing requirements apply whether or not you paid wages during the year, and missing the deadline triggers two separate penalties that can stack: 10% of any unpaid tax and $10 per late or missing income statement.
Who Has to File
Any entity registered as an Indiana withholding agent owes a WH-3. That covers corporations, partnerships, nonprofits, and sole proprietors who pay wages subject to Indiana state or county income tax withholding. The requirement sits in Indiana Code 6-3-4-8.1.1Indiana General Assembly. Indiana Code 6-3-4-8.1 – Monthly Return and Remittance; Periodic Deposit and Informational Return; Online Tax Filing; Notice to Employers
The trap: you file even if you paid no wages and withheld no tax. As long as the withholding account is open with the Department of Revenue (DOR), a return is due for every period. Skip it, and the DOR files an estimated return for you and sends a tax liability notice.2Indiana Department of Revenue. Withholding Income The only way out is to formally close the account.
Deadline and What You Submit
The WH-3 is due on or before the last day of January following the tax year, which lines up with the federal W-2 filing deadline.2Indiana Department of Revenue. Withholding Income
The reconciliation reports total wages paid, total state and county tax withheld, and total tax remitted during the year. It doesn’t travel alone. You attach the state copies of every income statement that applies to your workforce:
- Form W-2 for employee wages
- Form W-2G for certain gambling winnings
- Any 1099 that includes Indiana state withholding, including Form 1099-R for retirement distributions
The DOR reconciles those totals against the WH-1 periodic returns you filed through the year. Numbers that don’t line up are the most common reason for follow-up notices, so check the year’s WH-1 totals against your WH-3 before you submit.
When You Must File Electronically
Under Indiana Code 6-3-4-16.5, an employer filing a combined total of more than 25 W-2, W-2G, and 1099 forms in a calendar year must submit those forms and the WH-3 electronically.3Indiana General Assembly. Indiana Code 6-3-4-16.5 – Electronic Filing; Withholding Below that threshold, you can file through the DOR’s INTIME portal or on paper.
Electronic filers use one of two channels: INTIME or the SFTP bulk upload site.4Indiana Department of Revenue. EFW2 (W-2 and WH-3) Electronic Filing Requirements Most employers use INTIME, where you can either upload bulk files or key WH-3 data in directly after registering and verifying your tax account.5Indiana Department of Revenue. INTIME Guide to Withholding Taxes The confirmation the system returns is worth saving as proof of timely filing. Bulk files must be in EFW2 format, and the DOR no longer accepts removable media of any kind.
Filing on paper when you were required to file electronically carries the same 10% penalty as failing to file at all.
Penalties and Interest
Two penalty tracks apply, and they can hit the same filing.
10% of Unpaid Tax
Indiana Code 6-8.1-10-2.1 imposes a 10% penalty on any tax that was owed on the WH-3 and not paid, and the same 10% applies where the return should have been filed electronically but wasn’t.6Indiana Department of Revenue. Fines, Fees and Penalties7Indiana General Assembly. Indiana Code 6-8.1-10-2.1 – Penalties
$10 per Late Income Statement
Under Indiana Code 6-8.1-10-6, the DOR charges $10 for every W-2, W-2G, or 1099 that is filed late or missing from the WH-3 submission, capped at $25,000.6Indiana Department of Revenue. Fines, Fees and Penalties This one applies whether or not any tax is due. An employer with 200 employees who files a week late is looking at a $2,000 exposure before any tax penalty runs.
Interest
Interest accrues on any unpaid tax from the original due date. For calendar year 2026, the Indiana rate is 7%, set annually by the DOR.8Indiana Department of Revenue. Interest Rates for Calendar Year 2026 Because interest runs from the due date rather than the discovery date, correcting a missed filing quickly limits what accumulates.
A Note on Reciprocity
Indiana has reciprocal tax agreements with Kentucky, Michigan, Ohio, Pennsylvania, and Wisconsin.9Indiana Department of Revenue. Income Tax Information Bulletin #28 – Application of State and County Income Taxes to Residents with Out-of-State Income and Nonresidents with Indiana Source Income A resident of one of those states who works in Indiana generally pays state income tax to their home state, but the agreements don’t cover Indiana county income tax. If you withhold county tax from a reciprocal-state resident, that withholding still runs through the WH-3.
Out-of-state employers with a business connection to Indiana must withhold both state and county tax from Indiana-resident employees, which puts them on the hook for registering as a withholding agent and filing the WH-3.9Indiana Department of Revenue. Income Tax Information Bulletin #28 – Application of State and County Income Taxes to Residents with Out-of-State Income and Nonresidents with Indiana Source Income An out-of-state employer with no Indiana business connection isn’t required to withhold Indiana taxes, even for an Indiana-resident employee.
Fixing an Error After You File
Amended WH-3s go through INTIME using the same portal as the original. You submit the corrected reconciliation together with any corrected income statements (W-2c, for example).
Indiana’s statute of limitations for tax assessments generally runs three years from the date the original return was due or filed, whichever is later. Filing an amendment gives the DOR a fresh three-year window from the amendment date to assess additional tax, but only for amounts tied to the amendment itself.10Legal Information Institute. Indiana Code 45 IAC 15-5-7 – Statute of Limitations on Issuance of Proposed Assessment Any additional tax found through the amendment carries interest from the original due date, so fixing errors early is cheaper than fixing them late.
Records to Keep
Indiana Code 6-8.1-5-4 requires books and records sufficient for the DOR to determine the correct tax liability. For withholding, that includes payroll registers, W-2 copies, WH-3 filings, and DOR correspondence. Keep them at least three years after the final payment of the tax was due, or longer if a judicial proceeding or appeal is pending.11Indiana General Assembly. Indiana Code 6-8.1-5-4 – Recordkeeping Requirements
If you filed electronically, supporting documents need to be stored electronically. The practical version: keep digital copies of your EFW2 files, INTIME confirmations, and any corrected submissions.4Indiana Department of Revenue. EFW2 (W-2 and WH-3) Electronic Filing Requirements Without records, an audit turns into an estimated assessment you have to argue down instead of a return you can defend.
Closing the Withholding Account When You’re Done
When the business closes or you stop having employees, close the withholding account. Until you do, WH-1 and WH-3 obligations continue for every period, zero wages or not, and former employers routinely get hit with late-filing penalties years after their last employee left.2Indiana Department of Revenue. Withholding Income
File Form BC-100 (Business Closure Request) or close the account directly through INTIME. Writing “closed” on the final return doesn’t do it; the DOR won’t process an account change that way. You still owe a final WH-3 covering the period through your last day of operations, with all W-2s for that partial year.