September 15

What falls on September 15

• IRS employment tax deposit due — monthly depositorsOperator deadlineMonthly depositors deposit the employment taxes on wages paid during the previous month by the 15th day of the following month.Source: IRS — Employment tax due dates — checked September 23, 2026

What the data showed

On September 15, 2026, 1,571 restaurants traded in store across 115,771 in-store orders and 736 restaurants took 8,858 online orders. Every reading was within 5% of the 8 nearest Tuesdays.

Computed from the readings for the most recent September 15 in the index, not from anything the calendar entry above claims. The entries say only what their own sources say; the numbers here are the only thing Kwick365 knows about how this date trades, and they are recomputed every night.

Kwick365 has published readings on 2 occurrences of September 15.

• September 15, 2026 Readings
• September 15, 2025 Readings

The rest of September

• September 5
  National Cheese Pizza DayFood dayKwick365 publishes Pizza slice and Large pizza indexes.Source: National Day Calendar — checked September 23, 2026
• September 7
  National Beer Lover's DayFood daySource: National Day Calendar — checked September 23, 2026
• September 16
  National Guacamole DayFood daySource: National Day Calendar — checked September 23, 2026
• September 18
  National Cheeseburger DayFood dayKwick365 publishes a Burger (basic) index.Source: National Day Calendar — checked September 23, 2026
• September 20
  New York sales tax return due — quarterly filersOperator deadlineThe June 1 – August 31 quarter is due by the 20th. New York returns are filed no later than 20 days after the end of the period they relate to.Source: NYS Department of Taxation and Finance — Filing Requirements for Sales and Use Tax Returns — checked September 23, 2026

  National Fried Rice DayFood dayKwick365 publishes a Chicken fried rice index.Source: National Day Calendar — checked September 23, 2026

  Pepperoni Pizza DayFood dayKwick365 publishes Pizza slice and Large pizza indexes.Source: National Day Calendar — checked September 23, 2026
• September 25
  National Lobster DayFood daySource: National Day Calendar — checked September 23, 2026
• September 26
  National Dumpling DayFood daySource: National Day Calendar — checked September 23, 2026

  National Pancake DayFood daySource: National Day Calendar — checked September 23, 2026
• September 28
  National Drink Beer DayFood daySource: National Day Calendar — checked September 23, 2026
• September 29
  National Coffee DayFood dayKwick365 publishes a Coffee (regular drip) index.Source: National Day Calendar — checked September 23, 2026

The whole calendar · Methodology