Important deadlines for collecting excess sales tax vary depending on the jurisdiction. Here are some key deadlines:

– Monthly Return: In Pakistan, a registered person must file a monthly return, Annexure C, by the 18th day of the month following the period in which the supplies were made.
– Quarterly Return: In Pakistan, certain taxpayers, such as CNG dealers, are required to file quarterly returns.
– Annual Return: In Pakistan, manufacturers must file an annual sales tax return by September 30th of the following financial year.
– Payment Deadline: In Pakistan, payment for sales tax is due by the 15th of each month.
– Registration Deadline: In Florida, businesses must register to collect and remit sales tax within a specific timeframe, although the exact deadline is not specified.

It’s essential to note that these deadlines may be subject to change, and businesses should consult with the relevant tax authority or a tax professional to ensure compliance with all applicable deadlines.