It can be rare, but I have seen all three bureaus have a significant score spread. The reason that the scores differ is because not all creditors report to all three bureaus so if a collection agency reported to Transunion, for example, that score would be affected adversely while the other two scores are left unaffected since the account was not reported to those two bureaus. Keep in mind that one component of a FICO score is based on risk with the type of financing you are applying for so your bureau score may differ if the hard pull is a credit card lender versus a mortgage lender. 99 points is a big difference but I did see one report once with one bureau in the 500's, one in the 600's, and the other score in the low 700's! The derogatory tradelines just were not reported to the bureau with the score in the 700's. It is for this reason that the secondary market pulls a tri-merge report and bases the credit on the middle credit score and the middle lower score for multiple borrowers. A tri-merge report gives a much more accurate credit depiction.