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Hours and Location Off season hours Monday-Thursday: 9:00 am - 5:00 pm Friday: Closed Saturday: By appointment Sunday: Closed Tax season hours Monday-Friday: 9:00 am - 8:00 pm Saturday: 9:00 am - 6:00 pm Sunday: 12:00 pm - 5:00 pm CSL Tax Advisors, LLC 3906 S. Old Highway 94 Suite 500 Saint Charles, MO 63304 Phone (636) 441-1110 Fax: (636)447-3832 info@csltax.com Visit our blog.