Carpet on the stairs is generally not removed for safety reasons.  Exposed tack strip or staples, especially on steps is dangerous.  However, there are situations where removing carpet from steps is necessary to prevent damage to hardwood steps or in the case of sewage contamination. Removing tack strip is not advised, as this may damage the hardwood or sub-floor. Extreme caution must be used whenever tack strip is exposed or when the carpeted stairs are damp. If carpet left on the stairs is unsalvageable, it will be moved when new carpet is installed.