Indiana's Tax Amnesty Closes in 16 Days. If You Have Unfiled Returns, Your Real Deadline Is Today

Sixteen days.

That's how long Indiana's Tax Amnesty 2026 window stays open.

The amnesty window runs from July 15, 2026, through September 9, 2026. To receive the full waiver of penalties, interest, and collection fees, you must either pay the balance in full by that date or establish a payment plan by September 9. Payment plans must be paid in full by June 7, 2027 — no extensions are available for any reason.

But here's the detail most businesses are missing — and it changes your actual deadline significantly.

If you have unfiled Indiana returns, you need to file them as soon as possible and allow approximately two weeks after filing for the return to process and appear in INTIME before the September 9 deadline.

Two weeks of processing time. September 9 minus 14 days is August 24.

That's today.

If you have unfiled Indiana returns from before January 1, 2024 — and you want to use the amnesty program to resolve the resulting liability — filing those returns today is the last realistic opportunity to get them processed in time to participate.

What Indiana Is Offering — And Why It's Extraordinary

Indiana's Tax Amnesty 2026 is the most favorable resolution path for Indiana back-tax liability that has existed since 2015. And the one before that was 2005.

Taxpayers who act during this period can eliminate years of accumulated interest and penalty charges that may have grown well beyond the original tax principal.

What gets waived entirely:

• All accumulated penalties — regardless of how long they've been accruing
• All interest on eligible liabilities
• All collection fees
• Lien releases and protection from civil and criminal prosecution for eligible liabilities

What you still owe: the underlying tax principal only. Nothing more.

Indiana's 2015 amnesty generated over $131 million. The 2026 program covers a broader liability pool and is expected to exceed that figure. The state is running this program because it works — for both sides. Businesses resolve old liability at a fraction of the true cost. Indiana collects revenue it otherwise might never see.

Who Qualifies — The Rules That Matter

A business or individual with outstanding tax debts for periods ending before January 1, 2024, may be eligible to participate. Indiana residency is not required — any taxpayer with an Indiana filing obligation may participate.

The three eligibility conditions:

1. You have pre-2024 Indiana tax liability.
The program covers liabilities for tax periods ending before January 1, 2024. Sales tax, income tax, excise tax — most Indiana DOR-administered taxes qualify. Property taxes and unemployment taxes are not part of the program.

2. You didn't participate in Indiana's 2005 or 2015 amnesty programs.
Individuals and businesses that participated in either prior program are not eligible. If you used either prior amnesty, this one isn't available to you.

3. All your current Indiana returns must be filed.
You cannot participate in amnesty while carrying unfiled returns. The DOR requires your filing history to be current before amnesty can be granted — which is exactly why the unfiled return deadline is effectively today.

The Feature Nobody Else Is Talking About — Audited Businesses Still Qualify

This is the most significant and underappreciated feature of Indiana's 2026 amnesty.

In most state amnesty programs, being under audit disqualifies you entirely. The state found you first — you've lost the advantage of coming forward proactively. Indiana's standard Voluntary Disclosure Program typically excludes liabilities already under audit or active DOR inquiry.

Indiana's 2026 amnesty program explicitly allows audited businesses to participate and receive the full penalty and interest waiver.

The trade-off: taxpayers that pay their liabilities during the amnesty period waive their right to appeal or protest those amounts. By participating, you're accepting the liability and giving up the ability to contest it later. For most businesses with straightforward exposure, that's an acceptable trade. For businesses with legitimate legal defenses, weigh the decision carefully before participating.

The Double Penalty Warning

This is the consequence most businesses don't know about — and it's severe.

Failing to pay in full by September 9, 2026, or failing to fully complete an approved payment plan by June 7, 2027, generally means you lose amnesty benefits and can be subject to double penalties on the affected liabilities.

Double penalties. If you enroll in the amnesty program, establish a payment plan, and then fail to complete it by June 7, 2027 — you don't simply lose the amnesty benefit. You face double the normal penalty on the original liability.

This is not a standard late payment scenario. It's a punitive structure designed to make the amnesty commitment binding. If you participate, you need to be certain you can meet the payment plan terms. Enrolling and then defaulting is significantly worse than not enrolling at all.

Amnesty vs. Voluntary Disclosure — Choosing the Right Path

Indiana's Tax Amnesty 2026 isn't the only resolution option available. The Voluntary Disclosure Program is still running simultaneously — and for some businesses, it's the better choice.

Per communication with the Indiana DOR, the voluntary disclosure agreement program is still available to eligible non-filers even during the amnesty period.

Here's how to think about the choice:

Tax Amnesty 2026 is better if:

• You have significant pre-2024 liabilities with accumulated penalties and interest
• You've been registered in Indiana but under-collected or under-filed
• You're currently under audit and want to resolve it on favorable terms
• You want the broadest possible penalty and interest waiver
• Your liability is already showing in INTIME

Voluntary Disclosure is better if:

• You've never registered in Indiana and want to limit your lookback period — VDA typically covers only two to four prior years
• Your liability extends into 2024 and beyond — VDA covers all open periods
• You want to negotiate the scope of what years are examined
• You can live with paying interest in exchange for a shorter exposure window — VDA doesn't waive interest but limits how far back the state can look

The right answer depends entirely on your specific situation. A business with three years of under-collected Indiana sales tax and no filing history might benefit more from VDA's limited lookback. A business that filed correctly but has open audit periods with significant accrued interest might benefit more from amnesty's full waiver.

What the Eligibility Tool Shows — And What It Doesn't

Indiana launched a Tax Amnesty 2026 Eligibility Tool through INTIME that allows individuals and businesses to determine whether they may qualify.

The tool shows you what Indiana has already identified as eligible liabilities — assessed balances that are in the system and eligible for amnesty. It's a useful starting point.

But it doesn't show everything.

Even if the tool shows no eligible liabilities, any outstanding unfiled returns are still eligible for amnesty. Liabilities do not appear in Indiana's system until a return has been filed and processed. If you have unfiled Indiana returns for periods prior to January 1, 2024, it is important to file those outstanding returns as soon as possible. Indiana has indicated that taxpayers should allow approximately two weeks after filing for the return to appear in INTIME.

The tool showing zero balance doesn't mean you have zero exposure. It means Indiana hasn't assessed you yet. If you have unfiled returns — periods where you had Indiana sales or income that was never reported — that liability exists. It just hasn't been calculated yet. File the returns now and the liability gets assessed and becomes eligible for amnesty. Wait until after September 9 and it becomes a standard liability subject to full penalties and interest — with no amnesty path available.

The Step-by-Step Action Plan for Today

Given the two-week processing window, here's what needs to happen today for businesses with unfiled Indiana returns:

Step 1: Identify every unfiled Indiana return from periods before January 1, 2024.
Pull your records. What Indiana tax types were you required to file — sales tax, income tax, financial institutions tax? For which periods do you have unfiled returns? This is the scope of your immediate action item.

Step 2: Prepare and file those returns today.
The returns need to be filed — not just started, not just estimated — today or this week at the absolute latest. Every day of delay reduces the processing buffer before September 9.

Step 3: Log into INTIME and check the eligibility tool.
The eligibility tool allows taxpayers to check whether they have amnesty-eligible liabilities, log in or create an INTIME account to access balance details, and work directly with the Indiana DOR or United Collection Bureau regarding eligible liabilities. Visit in.gov/dor/amnesty to access the tool.

Step 4: Evaluate amnesty vs. VDA with a professional.
Before committing to either program, have a clear picture of your total liability, what years are at issue, and whether the amnesty's double-penalty default risk is something you can manage. The consultation to make this decision is worth far more than the cost of getting it wrong.

Step 5: Enroll and pay or establish a payment plan before September 9.
To participate, call UCB at 888-782-5985 to arrange to pay liabilities in full or set up a payment plan, or set up an INTIME account to either pay the liabilities in full or set up a payment plan. The September 9 deadline is the enrollment deadline — payment plans can extend through June 7, 2027. But enrollment itself must happen before September 9.

The Businesses Most at Risk Right Now

Three categories of businesses have the most to gain — and the most urgency — in the next 16 days.

Ecommerce sellers who crossed Indiana's nexus threshold and never registered.
Indiana's economic nexus threshold is $100,000 in sales — there is no longer a transaction count threshold. Sellers who crossed that threshold in 2021, 2022, or 2023 and never registered have been accumulating liability for years. The amnesty program is specifically designed for situations like this — and the double-penalty default risk is the reason to get it right the first time.

Businesses that collected Indiana sales tax but under-remitted.
Collecting the tax but failing to remit it is one of the most serious compliance failures — and one of the most common in businesses with cash flow problems. The underlying tax plus years of interest and penalties can be devastating. Amnesty reduces that to the underlying tax only.

Businesses currently under Indiana audit.
The fact that audited businesses can still participate is extraordinary. If you've received an audit notice from Indiana's DOR and have been dragging your feet on responding, the next 16 days are the window to resolve it on the most favorable terms available.

After September 9 — What Happens Next

The amnesty closes permanently on September 9. There are no extensions.

If Indiana follows its historical pattern, the next amnesty program won't come until 2036. A business that has Indiana exposure today and doesn't act in the next 16 days faces the full penalty and interest stack — potentially for another decade — before a comparable opportunity emerges.

Indiana's enforcement environment is not getting easier. The state's data matching capabilities have improved. Marketplace facilitator reporting creates a paper trail for sales that previously went undetected. The AI-powered audit selection tools being deployed across the country are active in Indiana too.

The window to resolve Indiana exposure on your own terms — before Indiana comes to you — closes in 16 days.

Operating a business with Indiana sales tax exposure — filed or unfiled — and want to understand whether amnesty or voluntary disclosure is the right path before September 9? Book a free consultation with our team at sales.tax. We'll review your Indiana nexus history, calculate your potential liability, and help you navigate the amnesty process before the window closes.