If Statement

This is how you can do it with Power Query.

Table.AddColumn(#"Changed Type", "Breach Status", each if [Todays Date] > [#"Expected fix Date "] and [Status] = "Open" then "Breach" else "Not Breach", type text)

Sample Script

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8i9IzVPSUTIw0jey0DcyMDJSMDSxMjUCCRkjhIytDEyBQk5FqYnJGUqxOgh9JvoGplBFplYGltj1+ecphBQlJmeDdTrn5BenpkAVmsPtBCvEotfDM0QpNhYA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Status = _t, #"Expected fix Date " = _t, #"Todays Date" = _t, #"SLA Status" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Todays Date", type datetime}, {"Expected fix Date ", type datetime}}),
    #"Added Custom1" = Table.AddColumn(#"Changed Type", "Breach Status", each if [Todays Date] > [#"Expected fix Date "] and [Status] = "Open" then "Breach" else "Not Breach", type text)
in
    #"Added Custom1"

This is how you can do it with DAX:

Breach Status DAX = if(and('Table'[Status] = "Open",'Table'[Expected fix Date ]<'Table'[Todays Date]),"Breach","Not Breach")