The KPMG Online Tax Calendar is a free iPhone application designed to help users manage their tax obligations efficiently. It provides timely reminders of crucial filing dates, ensuring that users do not miss important deadlines. The app is particularly useful in an ever-changing environment, as it promises updates to reflect any changes in deadlines due to restrictions or lockdowns.

In addition to its calendar features, the app offers access to an Insights page where users can explore the latest Bureau of Internal Revenue (BIR) issuances and KPMG's thought leadership articles. Although the calendar is based on information available at the time of publishing, it serves primarily as a tool to assist clients and should not replace professional tax advice.