How montaye works
From the official document to what a business must do, by when and how much: every step below is one montaye takes each day, with today's numbers.
From the document to your list
- Official documents 98 addresses watched
The agencies' publications, the codes, the official APIs: each fetched and compared every day.
Last checked Oct 22, 2026, 5:29 PM UTC
- Read, then checked 20 documents read into facts
Each rate, threshold and date with its page and its words. A new edition is taken only once every check written from its own text passes: the worked examples it prints, where it prints them, to the cent.
- Facts in force 86 facts in force today
Each for the days its document holds; and 6 rules for what the law leaves to a test.
- What you record
Its legal form and home, its year, how the IRS taxes it, where it does business, who holds it, who works for it; numbers only when they decide something.
- What you must do
Each obligation with its due date, its amount where the document prints one, and how the date was counted.
How a date is counted
A requirement says when, counted from a period; the authority's closed days move it. Every due date on your list opens on this chain, with the document's sentence under it.
- The period ends
- so many months on, a day of that month
- a weekend or a holiday
- the next open day: due
What montaye covers today
Counted from the facts in force today. A number is how many facts of that kind montaye reads for the place.
| Place | Due dates | Amounts and tables | Tests the law sets | Paycheck withholding |
|---|---|---|---|---|
| United States (federal) | 18 | 6 | 4 | One paycheck |
| California | 11 | 10 | 3 | One paycheck |
| Delaware | 18 | 16 | — | — |
Not yet
What montaye does not tell you yet, so you know to look elsewhere:
- When to deposit payroll taxes and how much (Form 941, Social Security and Medicare, monthly or semiweekly), and the quarterly payroll returns.
- California payroll: registering with the EDD, the quarterly DE 9, unemployment insurance.
- Sales and use tax.
- Places other than the United States federal government, California and Delaware.
Withholding, one paycheck at a time
Given a pay date, how often pay is paid, the gross and the employee's form (W-4, DE 4), montaye computes the federal income tax to withhold by Publication 15-T and California's by the EDD's Method B, each line naming the table and page it read. It is an API for now (payroll.calculate); it does not keep payrolls, so it does not yet add them up into deposits.
The API's page