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April 2026

Wed 15
April 15, 2026 @ 8:00 am - 9:00 am Event Series Extension filing / payment / Q1 Fed / CA Income tax

Extension filing / payment / Q1 Fed & CA estimated tax / Sole member LLC payment due

Payment Deadline for Individuals - Extension filing / payment / Q1 Fed & CA estimated tax / Sole member LLC payment due

June 2026

Mon 1
June 1, 2026 @ 8:00 am - 9:00 am Event Series Q2 Payment calculation as needed

Q2 Payment calculation as needed

Planning for Individuals - Q2 Payment calculation as needed

Mon 15
June 15, 2026 @ 8:00 am - 9:00 am Event Series Q2 Fed / CA Income tax and Pass-through entity (PTE) elective tax (AB-150 Payment) / CA Entity Tax

Q2 Fed / CA Income tax

Payment Deadline for Individuals - Q2 Fed / CA Income tax

Mon 15
June 15, 2026 @ 8:00 am - 9:00 am Event Series Q2 Fed / CA Income tax and Pass-through entity (PTE) elective tax (AB-150 Payment) / CA Entity Tax

Pass-through entity (PTE) elective tax (AB-150 Payment) / CA LLC Annual Fee (based on income) / CA S-Corp & C-Corp Estimated Tax installment payment

Payment Deadline for CA S-Corp / Multi Member LLC - Pass-through entity (PTE) elective tax (AB-150 Payment) / CA LLC Annual Fee (based on income) / CA S-Corp & C-Corp Estimated Tax installment payment

July 2026

Wed 1
July 1, 2026 @ 8:00 am - 9:00 am Event Series As needed planning and extended return target dates

As needed planning and extended return target dates

Vacation - As needed planning and extended return target dates

September 2026

Tue 1
September 1, 2026 @ 8:00 am - 9:00 am Event Series Q2 Payment calculation as needed

Q3 Payment calculation as needed

Planning for Individuals - Q3 Payment calculation as needed

Tue 15
September 15, 2026 @ 8:00 am - 9:00 am Event Series Q2 Fed Income tax (no CA payment due)

Q3 Fed Income tax (no CA payment due)

Payment Deadline for Individuals - Q3 Fed Income tax (no CA payment due)

Tue 15
September 15, 2026 @ 8:00 am - 9:00 am Event Series Returns must be filed

S-Corp / Multi Member LLC returns must be filed

Extended Filing Deadline for CA C-Corp / S-Corp / Multi Member LLC - S-Corp / Multi Member LLC returns must be filed

October 2026

Thu 15
October 15, 2026 @ 8:00 am - 9:00 am Event Series Returns must be filed

Returns must be filed

Extended Filing Deadline for Individuals - Returns must be filed

Thu 15
October 15, 2026 @ 8:00 am - 5:00 pm Event Series C-Corp returns must be filed / only for fiscal year is calendar year

C-Corp returns must be filed / only for fiscal year is calendar year

Extended Filing Deadline for CA C-Corp / S-Corp / Multi Member LLC - C-Corp returns must be filed / only for fiscal year is calendar year

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Gillingham CPA content is for education and information only. This is not advice of any kind. Please consult an Attorney or Certified Public Accountant.

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