Quarterly estimated tax deadline countdown for QuickSheet.
Never miss an IRS estimated tax payment again. Shows the next deadline with a countdown, urgency indicator, and progress bar — right on your desktop wallpaper.
| Cell value | Output |
|---|---|
qtr: |
Next upcoming IRS estimated tax deadline + days remaining |
qtr: 2026 |
All 4 quarterly deadlines for tax year 2026 |
Next deadline mode (qtr:):
🟡 Q3 (Tax Year 2026) │ 42 days left
Due: September 15, 2026 │ [██████████████░░░░░░]
IRS Form 1040-ES │ irs.gov/pub/irs-pdf/f1040es.pdf
Full year mode (qtr: 2026):
📅 Tax Year 2026 — Estimated Tax Deadlines │ Form 1040-ES
Q1: Apr 15, 2026 │ ✅ Paid
Q2: Jun 16, 2026 │ ✅ Paid
Q3: Sep 15, 2026 │ 🟢 42d left
Q4: Jan 15, 2027 │ 🟢 164d left
| Emoji | Meaning |
|---|---|
| 🔴 | Due within 7 days |
| 🟠 | Due within 14 days |
| 🟡 | Due within 30 days |
| 🟢 | 30+ days remaining |
Estimated tax payments (Form 1040-ES) are due quarterly:
| Quarter | Income period | Due date |
|---|---|---|
| Q1 | January – March | April 15 |
| Q2 | April – May | June 16 |
| Q3 | June – August | September 15 |
| Q4 | September – December | January 15 (next year) |
Dates shift to the next Monday if they fall on a weekend.
# Clone into QuickSheet extensions directory
cd ~/.quicksheet/extensions
git clone https://github.com/Deskworks/quicksheet-qtr.gitRequires .NET 9 SDK.
- quicksheet-1099-ext — 1099 tax calculator
- quicksheet-budget — Budget envelope visualizer
Uses QuickSheet's JSON-lines stdin/stdout extension protocol. See QuickSheet Extensions docs.
MIT