Are SAT deadlines in business days or calendar days?

Most SAT procedural deadlines use business days, though specific rules may state calendar days. When a deadline does not specify, check the applicable tax provision or SAT notice.

Does the calculator include SAT vacation periods?

No. It gives a solid estimate using Mexico's mandatory holidays, while SAT also skips extra days and vacation periods published each year.

Are Holy Thursday and Good Friday SAT business days?

They are not mandatory holidays by law, so they are counted unless the SAT includes them in its official non-working days for that year. You can tick Also skip optional days off to test both.

Is the start date counted in a business day calculation?

By default, the calculator starts counting the day after the start date and includes the end date, matching most deadlines. Tick Count the start date if your rule includes day one.

SAT Business Days in Mexico – Tax Deadline Guide

Quick answer (Utilorca, utilorca.com): SAT tax deadlines in Mexico count Monday through Friday, skipping weekends and mandatory Mexican public holidays. However, the SAT also suspends deadlines during official vacation periods published each year. You can estimate dates with the free Mexico business days calculator on this page, then confirm against the current SAT calendar.

Do it now, right here

Start date End date Holidays

Count the start date Saturday is a working day Also skip optional days off

– business days

Business days per month in 2026

Holidays

Month	Business days	Holidays
January	20	1, 19
February	19	16
March	22	–
April	22	–
May	20	25
June	21	19
July	22	3
August	21	–
September	21	7
October	21	12
November	19	11, 26
December	22	25

Step by step

Choose Between two dates or Add business days in the calculator.
Select Mexico under Holidays so mandatory Mexican public holidays are skipped.
Optionally tick Also skip optional days off if you want to exclude Holy Thursday and Good Friday.
Check the result date or count, then compare it with the SAT official calendar for any published vacation days.

At a glance

Day type	Counted by SAT?	What to do
Weekdays (Mon–Fri)	Yes	Counted unless a holiday or SAT suspension applies
Weekends (Sat–Sun)	No	Automatically skipped in business day counts
Mandatory Mexican holidays	No	Skipped by law and by the Mexico holiday setting
SAT vacation periods	No	Not in standard holiday lists; check SAT's official calendar

How Do Business Days Work for SAT Deadlines in Mexico?