2027 Quarters: Q1 to Q4 Start and End Dates, With Day Counts and Tax Due Dates

Calendar 2027 splits into four quarters of 90, 91, 92 and 92 days, by Fresh Calendars’ count, and the Internal Revenue Service (IRS) and the federal government each use their own quarter dates. Quarter 1 (Q1) runs Friday, Jan. 1 to Wednesday, March 31. Below are the start and end of Q1 to Q4, the weekday counts, and where the tax and fiscal-year quarters differ.

What are the start and end dates of each 2027 quarter?

The table is computed by Fresh Calendars from the Gregorian calendar. “Weekdays” means Monday to Friday and does not remove holidays. The 2027 total is 365 days.

Quarter	Starts	Ends	Days	Weekdays	Length
Q1	Fri., Jan. 1	Wed., March 31	90	64	12 weeks and 6 days
Q2	Thu., April 1	Wed., June 30	91	65	13 weeks exactly
Q3	Thu., July 1	Thu., Sept. 30	92	66
Q4	Fri., Oct. 1	Fri., Dec. 31	92	66

The first half (H1) of the year, Jan. 1 to June 30, has 181 days. The second half (H2), July 1 to Dec. 31, has 184. Q2 is the only quarter of exactly 13 weeks. See the 2027 printable yearly calendar for the full year, or the April 2027 and October 2027 pages for the starts of Q2 and Q4.

When are the IRS quarterly tax dates for 2027?

They are not the calendar quarters. The IRS “About Form 1040-ES” page, last reviewed Sept. 17, 2026, still lists the 2026 form, so the IRS has not yet announced 2027 estimated tax dates. Last year’s schedule is the guide. For tax year 2026, IRS Publication 505 gave four payment periods:

Tax year 2026 period	Due date
Jan. 1 to March 31	April 15, 2026
April 1 to May 31	June 15, 2026
June 1 to Aug. 31	Sept. 15, 2026
Sept. 1 to Dec. 31	Jan. 15, 2027

Those periods are 3, 2, 3 and 4 months long. If the IRS keeps the same pattern for 2027, our computation from the weekend-and-holiday rule gives Thursday, April 15, Tuesday, June 15 and Wednesday, Sept. 15, 2027. Jan. 15, 2028 is a Saturday and Monday, Jan. 17, 2028 is Martin Luther King Jr. Day, so the last date would move to Tuesday, Jan. 18, 2028. Treat those as unconfirmed until the 2027 form is posted. Our 2027 IRS tax calendar tracks the dates the IRS has published.

When is the 2027 Form 941 due for employers?

Form 941 is the employer’s quarterly return, and it follows calendar quarters. The Instructions for Form 941 say: “Your Form 941 is due by the last day of the month that follows the end of the quarter.” The instructions also say that when a due date falls on a Saturday, Sunday or legal holiday, you may file on the next business day. Our computation for 2027:

Quarter	Form 941 due
Q1	Fri., April 30
Q2	Mon., Aug. 2 (July 31 is a Saturday)
Q3	Mon., Nov. 1 (Oct. 31 is a Sunday)
Q4	Mon., Jan. 31, 2028

What quarter is the federal fiscal year in?

The U.S. Code, 31 U.S.C. 1102, says: “The fiscal year of the Treasury begins on October 1 of each year and ends on September 30 of the following year.” So federal fiscal year (FY) 2027 runs Oct. 1, 2026 to Sept. 30, 2027, and its first quarter is October to December 2026. By that count, the calendar Q4 of 2027 is the first quarter of FY 2028. Our fiscal year explainer explains the term, and retailers use a different grid in the retail 4-5-4 calendar for 2027.

What does the free 2027 quarters planner include?

The one-page planner prints each quarter with its dates, day and weekday counts and the Form 941 due date, a goals table with a Done column, twelve month boxes marked with the month-end date and four lines for quarterly reviews. It uses the same dates as the tables above.