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How long after closing does the new mortgage loan show on your credit?
Could be as fast as 30 or as much as 120 days. Unless you went to bank or credit union, most lenders sell the servicing to another investor within 30 days from closing, and once the new servicer has the loan on their books, they will start to report.
Mine showed up within a week of closing (closed on 24th, was reported on 1st)