What is trailing nexus?

Most states make you keep filing for a while after you drop below their threshold. California runs through the next full calendar year. Texas uses a rolling twelve months. We track each state's rule so you cancel on the right date, not too early.

Will I get in trouble for canceling a permit?

Not if you do it in the right order. We file every outstanding and final return first, then guide the cancellation. The real risk is canceling early or skipping a final return, which is exactly what we prevent.

Which platforms do you support?

Amazon, Shopify and WooCommerce, with BigCommerce, Etsy, Walmart and eBay supported through manual entry. You can also enter your states by hand on any platform.

Do you file my returns?

Yes. During the wind-down we file the zero-dollar returns so nothing lapses, and once you're deregistered in a state there's nothing left to file.

How is this different from Avalara or TaxJar?

They help you register and file more. We help you deregister and file less. We only charge for the states you keep.

No. TrailingZero is software that flags deregistration opportunities and handles filings. For complex situations we tell you when to bring in your accountant.

Is TrailingZero live?

Yes. Free audits are live now — run yours in minutes. Connect a store read-only or enter your registered states by hand to see which you can cancel and what it saves.

Do I have to keep filing in Illinois after I stop selling there?

Illinois has little or no trailing-nexus window, so once your nexus ends and final returns are filed you can generally stop.

What's the economic nexus threshold in Illinois?

Illinois uses $100,000 in sales (preceding 12 months, evaluated quarterly on the last day of March, June, September, and December). Under it, with no physical presence, you generally don't have economic nexus.

No. This page is general education built from public sources and the rules change often. Confirm your specific situation with the state's tax authority or your accountant before you register or deregister.

Deregistration guide

Can I cancel my sales tax registration in Illinois?

If you registered for a sales tax permit in Illinois to be safe and most of your returns now read $0, you may be paying to file in a state you no longer owe. Here's when you can cancel in Illinois — and how to do it without tripping a penalty.

By John DoeReviewed by Jane Doe, CPAUpdated June 2026How we verify

Can you deregister below threshold?: Yes, after trailing nexus
Trailing-nexus window: Minimal / none
Final return required: Yes
How to cancel: the online portal or form REG-16
Tax authority: Illinois Department of Revenue (IDOR)

Source: Illinois Department of Revenue (IDOR)

Short answer

Yes — once your nexus has genuinely ended. Canceling your Illinois sales tax registration makes sense if your rolling 12-month Illinois sales have been consistently below $100,000 and you have no physical presence in the state, because Illinois does not have a statutory trailing nexus period that would force you to stay registered. The catch is that you must file a final return (marked as such) before IDOR will process the closure, and you have the ongoing responsibility to monitor your Illinois sales each quarter — if you cross $100,000 again, you must promptly re-register.

Nexus & savings calculator

Estimate whether you still have nexus in Illinois — and what canceling could save.

State

Annual sales into Illinois

Transactions (orders) per year

Illinois no longer counts transactions — only sales matter here.

I have physical presence hereFBA/3PL inventory, an employee, or an office in Illinois

Filing frequency

Cost per return

Physical presence
Sales over $100,000
Transactions (not counted here)

Likely eligible to cancel

Based on these numbers you likely no longer have nexus in Illinois. You can usually deregister after clearing the trailing-nexus window and filing your final return.

Trailing nexus: Illinois has limited or no trailing-nexus window — you can generally deregister once your nexus has ended and final returns are filed.

You could stop paying

$600/ yr

How to cancel in Illinois →

Estimate only — general education, not tax advice. Confirm with Illinois's tax authority before you register or deregister.

Do you still have nexus in Illinois?

You can only cancel once your obligation has ended. Two things create it: physical presence (inventory, an employee, an office) and economic nexus (crossing $100,000 in sales).

For Amazon FBA and 3PL sellers the sneaky one is physical nexus: storing inventory in Illinois creates it. Standard physical nexus triggers include: owning/leasing/maintaining an office, warehouse, distribution center, or other place of business in Illinois; having employees, agents, or representatives operating in Illinois (including remote workers based in Illinois); storing inventory in Illinois fulfillment centers (including Amazon FBA). If that inventory has since left the state, your physical nexus may have already ended even though the registration is still open.

Trailing nexus in Illinois

Illinois does not have an explicitly codified trailing nexus statute. A remote seller who falls below the $100,000 rolling 12-month threshold may deregister. Because the threshold is evaluated quarterly on a rolling 12-month lookback, a seller drops out of nexus once a full rolling 12-month period falls below $100,000. There is no defined statutory trailing period beyond the measurement cycle itself.

A final return must be filed and marked as such before IDOR will close the account. After deregistering, the seller must continue monitoring Illinois sales quarterly; if the $100,000 threshold is exceeded again in any rolling 12-month period, the seller must re-register and resume collection. IDOR may convert the account to 'voluntary use tax' status rather than full closure in some cases.

How to cancel your Illinois sales tax permit

Confirm both your physical and economic nexus in Illinois have actually ended.
Work through Illinois's trailing-nexus window and keep filing (even $0 returns) until it closes.
File any outstanding returns and the final return (REG-16), marking it final.
Close the account via the online portal or form REG-16.
Keep your records; states can review a closed account for several years.

Where TrailingZero fits

TrailingZero connects to your store read-only, maps where you actually have nexus state by state, and computes the exact date you can deregister in Illinois after trailing nexus. During any wind-down it can file the zero-dollar returns so nothing lapses — and you only pay for the states you genuinely keep. Run a free audit anytime; this page is free education either way.

Illinois Can I cancel FAQ

Can I get in trouble for canceling my Illinois sales tax permit?: Not if you do it in the right order. The risk comes from canceling before Illinois's trailing-nexus window ends or skipping a final return. A final return must be filed and marked as such before IDOR will close the account. After deregistering, the seller must continue monitoring Illinois sales quarterly; if the $100,000 threshold is exceeded again in any rolling 12-month period, the seller must re-register and resume collection. IDOR may convert the account to 'voluntary use tax' status rather than full closure in some cases.
Do I have to keep filing in Illinois after I stop selling there?: Illinois has little or no trailing-nexus window, so once your nexus ends and final returns are filed you can generally stop.
What's the economic nexus threshold in Illinois?: Illinois uses $100,000 in sales (preceding 12 months, evaluated quarterly on the last day of March, June, September, and December). Under it, with no physical presence, you generally don't have economic nexus.
Is this tax advice?: No. This page is general education built from public sources and the rules change often. Confirm your specific situation with the state's tax authority or your accountant before you register or deregister.

See what you can stop paying in Illinois

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Other states

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Sources

Primary sources reviewed for this page. Data current as of June 2026.

TrailingZerois software, not a CPA or law firm, and this page is general education — not tax or legal advice. State rules and thresholds change frequently; confirm your situation with the state's tax authority or your accountant before you register or deregister. See how we research and review this data in our editorial & accuracy policy.