There are different ways of promoting a property as “coming soon,” and there are different requirements for each.
If the seller wants to list in the MLS but defer showings for up to a maximum of 21 days in an off-market status, you’d want to use the Coming Soon (CSO) status. For this status, you’ll need to have the seller sign a Coming Soon and Deferral of Showings Form and file the signed form with MLS PIN no later than 24 hours (excluding weekends and holidays) after you post the listing into the MLS as CSO. MLS PIN will not syndicate a listing while it is in the CSO status, but you may advertise the property on your own, according to your agreement with the seller.
If, on the other hand, the seller asks you to advertise the property as “coming soon” before posting it into the MLS, you must have the seller sign a Non-MLS Listing Form. This signed form must be filed with MLS PIN no later than 24 hours (excluding weekends and holidays) after you receive the signed, executed listing agreement.