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ARTICLE · 26 NOVEMBER 2025

Taking The Mystery Out Of Converting Old Court File Numbers

Each time a new matter is commenced with the Superior Court of Justice ("SCJ"), you are provided with a unique court file number.

CanadaLitigation, Mediation & Arbitration

Each time a new matter is commenced with the Superior Court of Justice (“SCJ”), you are provided with a unique court file number. There are two main formats in which the SCJ has issued court file numbers (“CFN”), which in this blog I will refer to as the “old” and “new” formats.

The old CFN format is as follows: _ _ – _ _ _ / _ _.  The first five digits represent the court's internal case or file number. The last two digits represent the year in which the CFN was issued. For example, if your CFN was issued in 2025, it would read _ _ – _ _ _ / 25.

The new CFN format is as follows: CV -_ _ – _ _ _ _ _ _ _ _ – 00ES (or 0000).  The first two digits represent the year in which the CFN was issued. For example, if your CFN was issued in 2025, it would read CV-25-_ _ _ _ _ _ _ _ -00ES (or 0000). The next eight digits represent the court's internal case or file number. The final four digits are an extension and will always either be 00ES  or 0000. The first, 00ES, is

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