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AAC Tax Calendar.

Filing and payment deadlines for the year, compiled by the firm so you never have to reconstruct them from scattered issuances. Dates carrying a deadline are marked with a line — select one to see what falls due.

All twelve months are final and reconciled against the BIR’s published 2026 calendar. A deadline that falls on a weekend, a holiday or a declared non-working day moves to the next working day.
Subscribe in Google CalendarSubscribe in Outlook or Apple CalendarPrintable PDFExcel workbookExcel — macro-enabled

The calendar file works in Outlook, Google Calendar, and Apple Calendar — every deadline is an all-day entry with the form number and covering period, and a reminder the day before. The Excel workbook carries the same 536 deadlines with a month grid you can filter and annotate; the macro-enabled version adds click-to-select on the grid, with the macro printed inside the file so you can read it before enabling it. Every file is stamped with the date it was compiled. Subscribing links the calendar to your own as a feed, so each deadline appears there with its reminder. It asks for no email address and nothing about you is sent to the firm.

October 2026
SunMonTueWedThuFriSat
A filing or payment falls due
1 deadline on

October 13, 2026

Filing

BIR Form 1601-C (Monthly Remittance Return of Income Taxes Withheld on Compensation) – eFPS Filers under Group C

Form 1601-CCovering Month of September 2026

Compiled from the BIR Tax Reminder schedule and reconciled against the BIR 2026 tax calendar, 23 August 2026. Dates are shown on their statutory due date: where that falls on a weekend, a holiday or a declared non-working day, the BIR moves the deadline to the next working day. Entries covering a fiscal quarter assume the quarter ends in the month shown. This calendar is a planning guide, not a substitute for professional advice on your own obligations.

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