Paying taxes?

Is the tax bureau for foreigners in Taipei (city) open on Saturdays? Saturday mornings? Does anyone have a phone number or a link to the Web site (with English information, if possible) of this bureau?

Also, do companies in Taiwan give their employees time off to file their taxes? Or are these employees expected to do this during their free time (or by taking a morning off)?

Do any companies allow foreign employees time off to go and complete this?

Thanks for the help and my apologies if this is already in the archives some place.