diff --git a/parser/gotest/gotest_test.go b/parser/gotest/gotest_test.go
index 33fb101..faa07d8 100644
--- a/parser/gotest/gotest_test.go
+++ b/parser/gotest/gotest_test.go
@@ -251,6 +251,7 @@ func TestReport(t *testing.T) {
 				Timestamp: testTimestamp,
 				Tests: []gtr.Test{
 					{
+						ID:       1,
 						Name:     "TestOne",
 						Duration: 1 * time.Millisecond,
 						Result:   gtr.Pass,
@@ -259,6 +260,7 @@ func TestReport(t *testing.T) {
 						},
 					},
 					{
+						ID:       2,
 						Name:     "TestSkip",
 						Duration: 1 * time.Millisecond,
 						Result:   gtr.Skip,
@@ -271,6 +273,7 @@ func TestReport(t *testing.T) {
 				Timestamp: testTimestamp,
 				Tests: []gtr.Test{
 					{
+						ID:       3,
 						Name:     "TestOne",
 						Duration: 1 * time.Millisecond,
 						Result:   gtr.Fail,
@@ -286,11 +289,13 @@ func TestReport(t *testing.T) {
 				Timestamp: testTimestamp,
 				Benchmarks: []gtr.Benchmark{
 					{
+						ID:      4,
 						Name:    "BenchmarkOne",
 						Result:  gtr.Pass,
 						NsPerOp: 100,
 					},
 					{
+						ID:     5,
 						Name:   "BenchmarkTwo",
 						Result: gtr.Fail,
 					},
@@ -301,6 +306,7 @@ func TestReport(t *testing.T) {
 				Name:      "package/failing1",
 				Timestamp: testTimestamp,
 				BuildError: gtr.Error{
+					ID:     6,
 					Name:   "package/failing1",
 					Cause:  "[build failed]",
 					Output: []string{"error message"},
@@ -346,18 +352,21 @@ func TestSubtestModes(t *testing.T) {
 						Timestamp: testTimestamp,
 						Tests: []gtr.Test{
 							{
+								ID:       1,
 								Name:     "TestParent",
 								Duration: 1 * time.Millisecond,
 								Result:   gtr.Pass,
 								Output:   []string{"TestParent output"},
 							},
 							{
+								ID:       2,
 								Name:     "TestParent/Subtest#1",
 								Duration: 2 * time.Millisecond,
 								Result:   gtr.Fail,
 								Output:   []string{"Subtest#1 output"},
 							},
 							{
+								ID:       3,
 								Name:     "TestParent/Subtest#2",
 								Duration: 3 * time.Millisecond,
 								Result:   gtr.Pass,
@@ -379,12 +388,14 @@ func TestSubtestModes(t *testing.T) {
 						Timestamp: testTimestamp,
 						Tests: []gtr.Test{
 							{
+								ID:       2,
 								Name:     "TestParent/Subtest#1",
 								Duration: 2 * time.Millisecond,
 								Result:   gtr.Fail,
 								Output:   []string{"Subtest#1 output"},
 							},
 							{
+								ID:       3,
 								Name:     "TestParent/Subtest#2",
 								Duration: 3 * time.Millisecond,
 								Result:   gtr.Pass,
diff --git a/parser/gotest/report_builder.go b/parser/gotest/report_builder.go
index 750d1f9..a326fa0 100644
--- a/parser/gotest/report_builder.go
+++ b/parser/gotest/report_builder.go
@@ -78,7 +78,8 @@ func (b *reportBuilder) CreateTest(name string) {
 	if parentID, ok := b.findTestParentID(name); ok {
 		b.parentIDs[parentID] = struct{}{}
 	}
-	b.tests[b.newID()] = gtr.Test{Name: name}
+	id := b.newID()
+	b.tests[id] = gtr.Test{ID: id, Name: name}
 }
 
 // PauseTest marks the active context as no longer active. Any results or
@@ -127,9 +128,8 @@ func (b *reportBuilder) End() {
 // most recently created benchmark will be updated. If no benchmark exists with
 // this name, a new benchmark is created.
 func (b *reportBuilder) CreateBenchmark(name string) {
-	b.benchmarks[b.newID()] = gtr.Benchmark{
-		Name: name,
-	}
+	id := b.newID()
+	b.benchmarks[id] = gtr.Benchmark{ID: id, Name: name}
 }
 
 // BenchmarkResult updates an existing or adds a new benchmark with the given
@@ -144,6 +144,7 @@ func (b *reportBuilder) BenchmarkResult(name string, iterations int64, nsPerOp,
 	}
 
 	b.benchmarks[id] = gtr.Benchmark{
+		ID:          id,
 		Name:        name,
 		Result:      gtr.Pass,
 		Iterations:  iterations,
@@ -173,7 +174,8 @@ func (b *reportBuilder) EndBenchmark(name, result string) {
 
 // CreateBuildError creates a new build error and marks it as active.
 func (b *reportBuilder) CreateBuildError(packageName string) {
-	b.buildErrors[b.newID()] = gtr.Error{Name: packageName}
+	id := b.newID()
+	b.buildErrors[id] = gtr.Error{ID: id, Name: packageName}
 }
 
 // CreatePackage adds a new package with the given name to the Report. This
@@ -197,6 +199,7 @@ func (b *reportBuilder) CreatePackage(name, result string, duration time.Duratio
 			if len(b.tests) > 0 || len(b.benchmarks) > 0 {
 				panic("unexpected tests and/or benchmarks found in build error package")
 			}
+			buildErr.ID = id
 			buildErr.Duration = duration
 			buildErr.Cause = data
 			pkg.BuildError = buildErr
@@ -388,7 +391,7 @@ func groupBenchmarksByName(benchmarks []gtr.Benchmark) []gtr.Benchmark {
 	byName := make(map[string][]gtr.Benchmark)
 	for _, bm := range benchmarks {
 		if _, ok := byName[bm.Name]; !ok {
-			grouped = append(grouped, gtr.Benchmark{Name: bm.Name})
+			grouped = append(grouped, gtr.Benchmark{ID: bm.ID, Name: bm.Name})
 		}
 		byName[bm.Name] = append(byName[bm.Name], bm)
 	}
diff --git a/parser/gotest/report_builder_test.go b/parser/gotest/report_builder_test.go
index 174924f..33cb712 100644
--- a/parser/gotest/report_builder_test.go
+++ b/parser/gotest/report_builder_test.go
@@ -15,29 +15,29 @@ func TestGroupBenchmarksByName(t *testing.T) {
 	}{
 		{nil, nil},
 		{
-			[]gtr.Benchmark{{Name: "BenchmarkFailed", Result: gtr.Fail}},
-			[]gtr.Benchmark{{Name: "BenchmarkFailed", Result: gtr.Fail}},
+			[]gtr.Benchmark{{ID: 1, Name: "BenchmarkFailed", Result: gtr.Fail}},
+			[]gtr.Benchmark{{ID: 1, Name: "BenchmarkFailed", Result: gtr.Fail}},
 		},
 		{
 			[]gtr.Benchmark{
-				{Name: "BenchmarkOne", Result: gtr.Pass, NsPerOp: 10, MBPerSec: 400, BytesPerOp: 1, AllocsPerOp: 2},
-				{Name: "BenchmarkOne", Result: gtr.Pass, NsPerOp: 20, MBPerSec: 300, BytesPerOp: 1, AllocsPerOp: 4},
-				{Name: "BenchmarkOne", Result: gtr.Pass, NsPerOp: 30, MBPerSec: 200, BytesPerOp: 1, AllocsPerOp: 8},
-				{Name: "BenchmarkOne", Result: gtr.Pass, NsPerOp: 40, MBPerSec: 100, BytesPerOp: 5, AllocsPerOp: 2},
+				{ID: 1, Name: "BenchmarkOne", Result: gtr.Pass, NsPerOp: 10, MBPerSec: 400, BytesPerOp: 1, AllocsPerOp: 2},
+				{ID: 2, Name: "BenchmarkOne", Result: gtr.Pass, NsPerOp: 20, MBPerSec: 300, BytesPerOp: 1, AllocsPerOp: 4},
+				{ID: 3, Name: "BenchmarkOne", Result: gtr.Pass, NsPerOp: 30, MBPerSec: 200, BytesPerOp: 1, AllocsPerOp: 8},
+				{ID: 4, Name: "BenchmarkOne", Result: gtr.Pass, NsPerOp: 40, MBPerSec: 100, BytesPerOp: 5, AllocsPerOp: 2},
 			},
 			[]gtr.Benchmark{
-				{Name: "BenchmarkOne", Result: gtr.Pass, NsPerOp: 25, MBPerSec: 250, BytesPerOp: 2, AllocsPerOp: 4},
+				{ID: 1, Name: "BenchmarkOne", Result: gtr.Pass, NsPerOp: 25, MBPerSec: 250, BytesPerOp: 2, AllocsPerOp: 4},
 			},
 		},
 		{
 			[]gtr.Benchmark{
-				{Name: "BenchmarkMixed", Result: gtr.Unknown},
-				{Name: "BenchmarkMixed", Result: gtr.Pass, NsPerOp: 10, MBPerSec: 400, BytesPerOp: 1, AllocsPerOp: 2},
-				{Name: "BenchmarkMixed", Result: gtr.Pass, NsPerOp: 40, MBPerSec: 100, BytesPerOp: 3, AllocsPerOp: 4},
-				{Name: "BenchmarkMixed", Result: gtr.Fail},
+				{ID: 1, Name: "BenchmarkMixed", Result: gtr.Unknown},
+				{ID: 2, Name: "BenchmarkMixed", Result: gtr.Pass, NsPerOp: 10, MBPerSec: 400, BytesPerOp: 1, AllocsPerOp: 2},
+				{ID: 3, Name: "BenchmarkMixed", Result: gtr.Pass, NsPerOp: 40, MBPerSec: 100, BytesPerOp: 3, AllocsPerOp: 4},
+				{ID: 4, Name: "BenchmarkMixed", Result: gtr.Fail},
 			},
 			[]gtr.Benchmark{
-				{Name: "BenchmarkMixed", Result: gtr.Fail, NsPerOp: 25, MBPerSec: 250, BytesPerOp: 2, AllocsPerOp: 3},
+				{ID: 1, Name: "BenchmarkMixed", Result: gtr.Fail, NsPerOp: 25, MBPerSec: 250, BytesPerOp: 2, AllocsPerOp: 3},
 			},
 		},
 	}