Editorial & accuracy policy
Current data vintage: June 2026.
Sales tax is a YMYL (“your money”) topic — a wrong figure can cost you penalties. Here is exactly how we research, review, date, and correct what we publish.
Where our data comes from
Every state page is built from primary sources — first the state's Department of Revenue, then established sales-tax research references. The primary sources we reviewed are listed at the bottom of each state page.
Who writes and reviews it
Guides are written and maintained by John Doe (Founder & Editor) and reviewed for accuracy by Jane Doe, CPA (Tax Reviewer) before publication. Each state page shows its author, reviewer, and last-reviewed date.
Confidence levels & manual review
Not all facts are equally settled. Each state carries a confidence level. The least-standardized fields are trailing-nexus windows and the exact deregistration steps. Where reputable sources disagree, we flag the state for manual review and show a “verify before you act” notice on the page rather than presenting a disputed figure as settled fact.
Freshness & review cadence
State thresholds and rules change often. We re-verify the dataset on a recurring basis and stamp each page with the date its facts were last reviewed. We do not fake freshness: a page's last-reviewed date reflects real review, not the day you happen to load it.
Corrections
Found something wrong or out of date? Email hello@trailingzero.app with the state and the source. We verify and update, and note material corrections.
Conflict-of-interest disclosure
TrailingZero is a commercial product: we earn subscription revenue and, at launch, a pass-through fee on filings. Unlike per-filing tax tools, our incentive is to help you file less — but it is still a commercial incentive, not impartial advice. Our guides are general education, reviewed for accuracy; they are not a substitute for your own CPA on your specific situation.
Not tax or legal advice
TrailingZerois software, not a CPA or law firm. Everything we publish is general education. Confirm your specific situation with the state's tax authority or your own accountant before you register or deregister.