The IRS designates September 15, 2025, as the deadline for third-quarter estimated tax payments covering income earned from June 1 to August 31, 2025.
Notably, this is the same deadline for extended returns of partnerships and S-corporations.
Seattle/Bellevue–Specific Considerations
Washington State
- No state income tax → estimated income tax deadlines don’t apply at the state level in WA.
- Business excise taxes (including B&O and retail sales tax) still follow monthly or quarterly reporting cycles, but these are separate obligations from federal estimated income tax.
Local Insights
- Local city taxes in Seattle or Bellevue don’t levy income taxes on individuals or businesses — just standard utilities, property taxes, etc.
- COVID-era relief or deferrals? As of mid-2025, there are no active deferral programs affecting estimated tax deadlines.
Practical Tip for You (Seattle/Bellevue residents):
- The September 15 federal deadline remains the key date for you.
- If you’re making Washington excise tax payments, your timeline is unrelated—those follow their own quarterly schedule, typically ending at quarter’s end (e.g., July 31 for Q2).
| Group | Must Pay Third-Quarter Estimated Tax? | Key Deadline | Additional WA Considerations |
|---|---|---|---|
| Self-employed, freelancers, gig workers | Yes | September 15, 2025 | None at the state level |
| Partners, S-corp shareholders | Yes (if not covered by withholding) | September 15, 2025 | No state income tax |
| Traditional employees | Only if you under-withhold elsewhere | N/A | Independent WA excise tax on separate schedule |
Would you like help scheduling reminders, calculating an estimated amount, or setting up a withholding adjustment to cover this? Contact us today to get help with your taxes. Bellevue (206) 838-3800 — Duvall (425) 788-1544
Posted in Tax Due Dates, Tax Planning