Severance pay must be paid to an employee who his/her employment is terminated as follows:

* an employee who has worked for an uninterrupted period of 120 days but less than 1 year.

Does this mean 120 working days or just 4 months in general?

From my understanding it is 120 days (i.e. aprox 4 months) regardless of number of working days.

correct!

I would like additional clarification on this...

If a staff member is paid a monthly salary, would you calculate the DAILY pay and then pay them 90 days of pay? Or, would you pay them 3 months of their monthly salary? Since most people do not work 30 days per month, the amount can be quite significant.

The law says 90 days of severance should be paid but I am assuming that most would assume this to be 3 months as this is what everyone usually says.

http://www.boi.go.th:8080/issue/200506_16_6/14.htm

90 days (three months) not 90 working days.