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. Measured against the 5 nearest Tuesdays: the median restaurant took 12.0 online orders (5.1% more).

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