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.

Does Colorado have a sales tax?

Yes. The statewide base rate is 2.9%. Remote sellers collect it once they have nexus.

When do I have to register for sales tax in Colorado?

When you have physical presence there or cross $100,000 in sales over previous or current calendar year.

Can I cancel my Colorado registration if I'm under the threshold?

Generally yes, after clearing Colorado's trailing-nexus window and filing a final return.

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.

Seller's guide

Sales tax in Colorado

Everything an online seller needs to know about sales tax in Colorado: the rate, when you have to register, marketplace rules, filing, and when you can cancel — in plain English.

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

Statewide base rate: 2.9%
Economic threshold: $100,000 in sales
Marketplace law: Yes
Trailing nexus: Minimal
Tax authority: Colorado Department of Revenue — Taxation Division

Source: Colorado Department of Revenue — Taxation Division

Nexus & savings calculator

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

State

Annual sales into Colorado

Transactions (orders) per year

Colorado no longer counts transactions — only sales matter here.

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

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 Colorado. You can usually deregister after clearing the trailing-nexus window and filing your final return.

Trailing nexus: Colorado 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 Colorado →

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

Do you need to collect sales tax in Colorado?

You have a duty to collect once you have nexus: physical presence (inventory, staff, an office) or economic nexus from crossing $100,000 in sales over previous or current calendar year. Colorado used to trigger nexus at 200 transactions but removed that count in April 2019 — only the sales figure matters now.

The Colorado rate

Colorado's statewide base sales tax rate is 2.9%. Combined rates vary significantly by location, reaching up to approximately 11.2% when state, county, city, and special district taxes are stacked.

Marketplace and direct sales

Marketplaces like Amazon collect Colorado tax for you, but those sales don't count toward your own threshold. Direct sales on your own store you collect yourself.

Filing and zero returns

Once registered, Colorado requires a return every assigned period even when you owe $0 — miss one and you can face penalties. Effective April 14, 2026: Monthly filing required if average monthly state and state-administered local tax collected is $1,100 or more; Quarterly if $50 to under $1,100; Annual if $50 or less.

When you can cancel

If your Colorado returns are mostly $0, you may be over-registered. Canceling your Colorado sales tax registration makes sense once you are confident your gross retail sales into Colorado fell below $100,000 in the prior full calendar year and are tracking below $100,000 in the current year — at that point you no longer meet the economic nexus threshold and ongoing registration (plus mandatory zero-return filings) creates unnecessary compliance burden. The key catch is Colorado's calendar-year measurement: if you exceeded the threshold last year, you remain obligated through this full calendar year even if sales have since dropped, so canceling too early can leave you liable.

Where TrailingZero fits

TrailingZero connects to your store read-only, maps where you actually have nexus state by state, and maps your real nexus in Colorado and flags whether you should register, keep filing, or cancel. 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.

Colorado Sales tax guide FAQ

Does Colorado have a sales tax?: Yes. The statewide base rate is 2.9%. Remote sellers collect it once they have nexus.
When do I have to register for sales tax in Colorado?: When you have physical presence there or cross $100,000 in sales over previous or current calendar year.
Can I cancel my Colorado registration if I'm under the threshold?: Generally yes, after clearing Colorado's trailing-nexus window and filing a final return.
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 Colorado

Run a free audit and see which registrations you can drop — in minutes, no card required.

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Other states

See all states →

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.