Quick answer
Build a business tax calendar from confirmed obligations for your entity and jurisdictions. Track return filing, estimated payments and payroll obligations separately, then work backward to record-gathering and approval dates. An extension to file does not automatically extend the payment deadline.
Confirm your obligations
Ask your adviser to identify relevant filing and payment obligations based on your entity, locations and workforce. Do not assume another business follows the same schedule.
Work backward
Add internal dates for gathering records, reviewing drafts and approving payments ahead of confirmed external deadlines.
Keep it current
Revisit the calendar when your business changes. Official agencies and your adviser should confirm current dates and any extensions.
Check filing and payment dates separately
Keep return filing, estimated payments and payroll obligations as separate entries. They do not necessarily share a deadline. Follow the current agency instructions for each obligation and ask your adviser how an extension or business change affects your situation; do not assume a filing extension also moves a payment deadline.
Sources and further reading
General organizational information, not individualized tax, legal or financial advice. Confirm requirements with a qualified adviser familiar with your circumstances.