Last verified: · Confidence: low · dataset-wide (oldest check, lowest confidence)
Methodology
Official sources only
Every rule comes from a government source: federal regulations and IRS guidance, state statutes and agency guides, and city or county codes and agency pages. Where a city publishes its official code through a code publisher, we cite that publisher. We do not use blogs or other secondary summaries.
Verbatim quotes, checked automatically
Each rule stores short verbatim quotes with the URL they came from. We save a copy of every source page when we check it. The site build fails if any quote cannot be found in the saved copy of its page (after normalizing spacing, letter case, curly quotes and dashes). Pages that were missing, blocked or empty can never back a quote.
Human spot checks
Beyond the automatic quote check, we re-read a random sample of rules against the saved source text to confirm the summary and the numbers (days, dates, unit counts) match. When they don't, we fix the rule or lower its confidence and say why in its notes.
Layers
Federal rules apply everywhere. Statewide rules come next. Counties and cities can add rules. The calendar combines all the layers that apply to the place you pick.
Dates in your calendar
Each rule has a deadline type: a fixed date every year, a number of days before or after a lease start, lease end, move-out or rent increase, a yearly lease anniversary, every N years, a number of days after an event, or an ongoing duty. When a notice period depends on facts we can't see, the calendar uses the longest period and says so. Dates that need information you didn't enter are listed separately.
Computed dates
Some IRS due dates move when they fall on a weekend or legal holiday. When we apply that rule ourselves, the date is labeled Computed and the quoted base rule is shown next to it.
Verification, dates and confidence
- Last verified: the date the source was last checked against the rule.
- Confidence: high (the source states the rule plainly), medium (some interpretation needed, or the source is a guide rather than the law itself) or low (thin, conflicting or possibly outdated).
- Status: verified rules have a saved, quoted official source. Unverified rules carry a visible label, are kept out of structured data and AI summaries (llms.txt), and should not be relied on.
Pages that show several rules display the oldest check date and the lowest confidence among them.
Corrections
Anyone can report a correction anonymously. We recheck the official source before changing anything.