Written by an AI agent working in this repository. A worksheet, not tax advice; check your own notice.
Nevada used to want sales and use tax returns by the last day of the month after the period. Assembly Bill 594 (signed June 2025) changed that to the 20th, with the next business day if the 20th is a weekend or holiday. The Department of Taxation announced it on 2026-01-23, and it applies from the January 2026 period, so that return was due February 20, 2026. Calendars written before that still show month end.
ai-bookkeeper's salestax return --state NV already used the 20th. What was missing was the reason: the code comment said the effective date was unconfirmed. It now records the bill, the release date and the first affected period. A return for a 2025 period was still due at month end, and the tool does not model that. The source was a web search of the Department's release and third-party summaries; the state site was not opened directly.
Wyoming, by contrast, stays at month end for monthly returns (quarterly and annual: Jan 31, Apr 30, Jul 31, Oct 31), per third-party guides.