diff --git a/slurm-eff-tool.py b/slurm-eff-tool.py
index 729fd14..ec69a75 100755
--- a/slurm-eff-tool.py
+++ b/slurm-eff-tool.py
@@ -59,6 +59,7 @@ SACCT_FIELDS = [
 
 DEFAULT_COLUMNS = [
     "username",
+    "JobID",
     "CPUs",
     "Nodes",
     "ReqMem",
@@ -74,6 +75,7 @@ DEFAULT_COLUMNS = [
 # One-character aliases for sorting and output format specifications.
 ALIASES = {
     "u": "username",
+    "i": "JobID",
     "c": "CPUs",
     "N": "Nodes",
     "m": "ReqMem",
@@ -122,6 +124,7 @@ class JobRecord:
 @dataclass
 class OutputRow:
     username: str
+    JobID: str
     CPUs: int
     Nodes: int
     ReqMem: float | None
@@ -139,6 +142,7 @@ class OutputRow:
     def as_dict(self, sdev: bool = False) -> dict[str, Any]:
         d: dict[str, Any] = {
             "username": self.username,
+            "JobID": self.JobID,
             "CPUs": self.CPUs,
             "Nodes": self.Nodes,
             "ReqMem": self.ReqMem,
@@ -455,6 +459,7 @@ def aggregate_records(records: list[JobRecord], args: argparse.Namespace) -> lis
 def make_single_row(rec: JobRecord) -> OutputRow:
     return OutputRow(
         username=rec.username,
+        JobID=rec.raw.get("JobIDRaw", rec.raw.get("JobID", "")),
         CPUs=rec.cpus,
         Nodes=rec.nodes,
         ReqMem=rec.reqmem_gb,
@@ -478,6 +483,7 @@ def make_aggregate_row(records: list[JobRecord], username: str, jobname: str) ->
     time_vals = [r.time_eff for r in records if r.time_eff is not None]
     return OutputRow(
         username=username,
+        JobID="",
         CPUs=first.cpus,
         Nodes=first.nodes,
         ReqMem=first.reqmem_gb,
@@ -654,7 +660,7 @@ def parse_args(argv: list[str]) -> argparse.Namespace:
         "--format",
         help=(
             "Slurm-like output format using aliases: "
-            "u=username,c=CPUs,N=Nodes,m=ReqMem,p=MemPerCPU,l=ReqWalltime,C=Count,"
+            "u=username,i=JobID,c=CPUs,N=Nodes,m=ReqMem,p=MemPerCPU,l=ReqWalltime,C=Count,"
             "e=CPU_Efficiency,M=Memory_Efficiency,t=Time_Efficiency,j=jobname"
         ),
     )
@@ -682,12 +688,17 @@ def main(argv: list[str] | None = None) -> int:
     out_rows = aggregate_records(records, args)
     out_rows = sort_rows(out_rows, args.sort)
 
+    if args.aggr_user or args.aggr_regexp:
+        output_columns = [c for c in DEFAULT_COLUMNS if c != "JobID"]
+    else:
+        output_columns = DEFAULT_COLUMNS
+
     if args.json:
         print(json.dumps([r.as_dict(sdev=args.sdev) for r in out_rows], indent=2))
     elif args.format:
         print_custom_format(out_rows, args.format, args.sdev)
     else:
-        print_table(out_rows, DEFAULT_COLUMNS, args.sdev)
+        print_table(out_rows, output_columns, args.sdev)
 
     return 0