diff --git a/pkg/apis/pipeline/v1alpha1/pipelinerun_types.go b/pkg/apis/pipeline/v1alpha1/pipelinerun_types.go
index 828739c7494..1e0853c1115 100644
--- a/pkg/apis/pipeline/v1alpha1/pipelinerun_types.go
+++ b/pkg/apis/pipeline/v1alpha1/pipelinerun_types.go
@@ -52,12 +52,6 @@ type PipelineRunSpec struct {
 	Params []Param `json:"params,omitempty"`
 	// +optional
 	ServiceAccountName string `json:"serviceAccountName,omitempty"`
-	// DeprecatedServiceAccount is a depreciated alias for ServiceAccountName.
-	// Deprecated: Use serviceAccountName instead.
-	// +optional
-	DeprecatedServiceAccount string `json:"serviceAccount,omitempty"`
-	// +optional
-	DeprecatedServiceAccounts []DeprecatedPipelineRunSpecServiceAccount `json:"serviceAccounts,omitempty"`
 	// +optional
 	ServiceAccountNames []PipelineRunSpecServiceAccountName `json:"serviceAccountNames,omitempty"`
 	// Used for cancelling a pipelinerun (and maybe more later on)
@@ -156,16 +150,6 @@ func (pr *PipelineRunStatus) InitializeConditions() {
 	pipelineRunCondSet.Manage(pr).InitializeConditions()
 }
 
-// DeprecatedPipelineRunSpecServiceAccount can be used to configure specific
-// ServiceAccount for a concrete Task
-// Deprecated: Use pipelineRunSpecServiceAccountName instead.
-type DeprecatedPipelineRunSpecServiceAccount struct {
-	TaskName string `json:"taskName,omitempty"`
-	// DeprecatedServiceAccount is a depreciated alias for ServiceAccountName.
-	// Deprecated: Use serviceAccountName instead.
-	DeprecatedServiceAccount string `json:"serviceAccount,omitempty"`
-}
-
 // PipelineRunSpecServiceAccountName can be used to configure specific
 // ServiceAccountName for a concrete Task
 type PipelineRunSpecServiceAccountName struct {
@@ -279,14 +263,6 @@ func (pr *PipelineRun) IsTimedOut() bool {
 // PipelineTask if configured, otherwise it returns the PipelineRun's serviceAccountName.
 func (pr *PipelineRun) GetServiceAccountName(pipelineTaskName string) string {
 	serviceAccountName := pr.Spec.ServiceAccountName
-	if serviceAccountName == "" {
-		serviceAccountName = pr.Spec.DeprecatedServiceAccount
-	}
-	for _, sa := range pr.Spec.DeprecatedServiceAccounts {
-		if sa.TaskName == pipelineTaskName {
-			serviceAccountName = sa.DeprecatedServiceAccount
-		}
-	}
 	for _, sa := range pr.Spec.ServiceAccountNames {
 		if sa.TaskName == pipelineTaskName {
 			serviceAccountName = sa.ServiceAccountName
diff --git a/pkg/apis/pipeline/v1alpha1/pipelinerun_types_test.go b/pkg/apis/pipeline/v1alpha1/pipelinerun_types_test.go
index 737b33a1e21..32d5d51d4a1 100644
--- a/pkg/apis/pipeline/v1alpha1/pipelinerun_types_test.go
+++ b/pkg/apis/pipeline/v1alpha1/pipelinerun_types_test.go
@@ -235,31 +235,18 @@ func TestPipelineRunGetServiceAccountName(t *testing.T) {
 				"taskName": "taskSA",
 			},
 		},
-		{
-			"deprecated default SA",
-			tb.PipelineRun("pr", "ns",
-				tb.PipelineRunSpec("prs",
-					tb.PipelineRunDeprecatedServiceAccountName("", "deprecatedSA"),
-					tb.PipelineRunDeprecatedServiceAccountTask("taskName", "deprecatedTaskSA"))),
-			map[string]string{
-				"unknown":  "deprecatedSA",
-				"taskName": "deprecatedTaskSA",
-			},
-		},
 		{
 			"mixed default SA",
 			tb.PipelineRun("defaultSA", "defaultSA",
 				tb.PipelineRunSpec("defaultSA",
-					tb.PipelineRunDeprecatedServiceAccountName("defaultSA", "deprecatedSA"),
+					tb.PipelineRunServiceAccountName("defaultSA"),
 					tb.PipelineRunServiceAccountNameTask("task1", "task1SA"),
 					tb.PipelineRunServiceAccountNameTask("task2", "task2SA"),
-					tb.PipelineRunDeprecatedServiceAccountTask("deprecatedTask3", "deprecatedTask3SA"),
-					tb.PipelineRunDeprecatedServiceAccountTask("task2", "deprecated"))),
+				)),
 			map[string]string{
-				"unknown":         "defaultSA",
-				"task1":           "task1SA",
-				"task2":           "task2SA",
-				"deprecatedTask3": "deprecatedTask3SA",
+				"unknown": "defaultSA",
+				"task1":   "task1SA",
+				"task2":   "task2SA",
 			},
 		},
 	} {
diff --git a/pkg/apis/pipeline/v1alpha1/taskrun_types.go b/pkg/apis/pipeline/v1alpha1/taskrun_types.go
index ab13a64cd4f..1a676a7cbaf 100644
--- a/pkg/apis/pipeline/v1alpha1/taskrun_types.go
+++ b/pkg/apis/pipeline/v1alpha1/taskrun_types.go
@@ -35,10 +35,6 @@ type TaskRunSpec struct {
 	Outputs TaskRunOutputs `json:"outputs,omitempty"`
 	// +optional
 	ServiceAccountName string `json:"serviceAccountName"`
-	// DeprecatedServiceAccount is a depreciated alias for ServiceAccountName.
-	// Deprecated: Use serviceAccountName instead.
-	// +optional
-	DeprecatedServiceAccount string `json:"serviceAccount,omitempty"`
 	// no more than one of the TaskRef and TaskSpec may be specified.
 	// +optional
 	TaskRef *TaskRef `json:"taskRef,omitempty"`
@@ -291,15 +287,6 @@ func (tr *TaskRun) GetRunKey() string {
 	return fmt.Sprintf("%s/%p", "TaskRun", tr)
 }
 
-func (tr *TaskRun) GetServiceAccountName() string {
-	name := tr.Spec.ServiceAccountName
-	if name == "" {
-		name = tr.Spec.DeprecatedServiceAccount
-	}
-	return name
-
-}
-
 // IsPartOfPipeline return true if TaskRun is a part of a Pipeline.
 // It also return the name of Pipeline and PipelineRun
 func (tr *TaskRun) IsPartOfPipeline() (bool, string, string) {
diff --git a/pkg/apis/pipeline/v1alpha1/taskrun_types_test.go b/pkg/apis/pipeline/v1alpha1/taskrun_types_test.go
index 9e1b8a95a24..aea8d19b104 100644
--- a/pkg/apis/pipeline/v1alpha1/taskrun_types_test.go
+++ b/pkg/apis/pipeline/v1alpha1/taskrun_types_test.go
@@ -153,33 +153,6 @@ func TestTaskRunHasStarted(t *testing.T) {
 	}
 }
 
-func TestTaskRunGetServiceAccountName(t *testing.T) {
-	for _, tt := range []struct {
-		name       string
-		tr         *v1alpha1.TaskRun
-		expectedSA string
-	}{{
-		"service account",
-		tb.TaskRun("name", "ns", tb.TaskRunSpec(tb.TaskRunServiceAccountName("defaultSA"))),
-		"defaultSA",
-	},
-		{
-			"deprecated SA",
-			tb.TaskRun("name", "ns", tb.TaskRunSpec(tb.TaskRunDeprecatedServiceAccount("", "deprecatedSA"))),
-			"deprecatedSA",
-		},
-		{
-			"both SA",
-			tb.TaskRun("name", "ns", tb.TaskRunSpec(tb.TaskRunDeprecatedServiceAccount("defaultSA", "deprecatedSA"))),
-			"defaultSA",
-		},
-	} {
-		if e, a := tt.expectedSA, tt.tr.GetServiceAccountName(); e != a {
-			t.Errorf("%s: wrong service account name: got: %q want: %q", tt.name, a, e)
-		}
-	}
-}
-
 func TestTaskRunIsOfPipelinerun(t *testing.T) {
 	tests := []struct {
 		name                  string
diff --git a/pkg/apis/pipeline/v1alpha1/zz_generated.deepcopy.go b/pkg/apis/pipeline/v1alpha1/zz_generated.deepcopy.go
index 6148013aeaf..2d57103828e 100644
--- a/pkg/apis/pipeline/v1alpha1/zz_generated.deepcopy.go
+++ b/pkg/apis/pipeline/v1alpha1/zz_generated.deepcopy.go
@@ -379,22 +379,6 @@ func (in *ConditionSpec) DeepCopy() *ConditionSpec {
 	return out
 }
 
-// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
-func (in *DeprecatedPipelineRunSpecServiceAccount) DeepCopyInto(out *DeprecatedPipelineRunSpecServiceAccount) {
-	*out = *in
-	return
-}
-
-// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new DeprecatedPipelineRunSpecServiceAccount.
-func (in *DeprecatedPipelineRunSpecServiceAccount) DeepCopy() *DeprecatedPipelineRunSpecServiceAccount {
-	if in == nil {
-		return nil
-	}
-	out := new(DeprecatedPipelineRunSpecServiceAccount)
-	in.DeepCopyInto(out)
-	return out
-}
-
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *GCSResource) DeepCopyInto(out *GCSResource) {
 	*out = *in
@@ -957,11 +941,6 @@ func (in *PipelineRunSpec) DeepCopyInto(out *PipelineRunSpec) {
 			(*in)[i].DeepCopyInto(&(*out)[i])
 		}
 	}
-	if in.DeprecatedServiceAccounts != nil {
-		in, out := &in.DeprecatedServiceAccounts, &out.DeprecatedServiceAccounts
-		*out = make([]DeprecatedPipelineRunSpecServiceAccount, len(*in))
-		copy(*out, *in)
-	}
 	if in.ServiceAccountNames != nil {
 		in, out := &in.ServiceAccountNames, &out.ServiceAccountNames
 		*out = make([]PipelineRunSpecServiceAccountName, len(*in))
diff --git a/pkg/reconciler/pipelinerun/pipelinerun_test.go b/pkg/reconciler/pipelinerun/pipelinerun_test.go
index 374936192c2..026db64ddc5 100644
--- a/pkg/reconciler/pipelinerun/pipelinerun_test.go
+++ b/pkg/reconciler/pipelinerun/pipelinerun_test.go
@@ -1073,138 +1073,6 @@ func TestReconcileWithDifferentServiceAccounts(t *testing.T) {
 
 }
 
-func TestReconcileWithDeprecatedServiceAccounts(t *testing.T) {
-	names.TestingSeed()
-
-	ps := []*v1alpha1.Pipeline{
-		tb.Pipeline("test-sa-0", "foo", tb.PipelineSpec(tb.PipelineTask("deprecated-sa-0", "hello-world-task"))),
-		tb.Pipeline("test-sa-1", "foo", tb.PipelineSpec(tb.PipelineTask("sa-1", "hello-world-task"))),
-		tb.Pipeline("test-sa-2", "foo", tb.PipelineSpec(tb.PipelineTask("task-deprecated-sa-2", "hello-world-task"))),
-		tb.Pipeline("test-sa-3", "foo", tb.PipelineSpec(tb.PipelineTask("task-sa-3", "hello-world-task"))),
-	}
-	prs := []*v1alpha1.PipelineRun{
-		tb.PipelineRun("test-pipeline-run-deprecated-sa-0", "foo",
-			tb.PipelineRunSpec("test-sa-0",
-				tb.PipelineRunDeprecatedServiceAccountName("", "sa-0"),
-			),
-		),
-		tb.PipelineRun("test-pipeline-run-sa-1", "foo",
-			tb.PipelineRunSpec("test-sa-1",
-				tb.PipelineRunDeprecatedServiceAccountName("sa-1", "sa-0"),
-			),
-		),
-		tb.PipelineRun("test-pipeline-run-task-deprecated-sa-2", "foo",
-			tb.PipelineRunSpec("test-sa-2",
-				tb.PipelineRunServiceAccountName("wrong-sa"),
-				tb.PipelineRunDeprecatedServiceAccountTask("task-deprecated-sa-2", "sa-2"),
-			),
-		),
-		tb.PipelineRun("test-pipeline-run-task-sa-3", "foo",
-			tb.PipelineRunSpec("test-sa-3",
-				tb.PipelineRunServiceAccountName("wrong-sa"),
-				tb.PipelineRunServiceAccountNameTask("task-sa-3", "sa-3"),
-				tb.PipelineRunDeprecatedServiceAccountTask("task-sa-3", "wrong-deprecated-sa"),
-			),
-		),
-	}
-
-	ts := []*v1alpha1.Task{
-		tb.Task("hello-world-task", "foo"),
-	}
-
-	d := test.Data{
-		PipelineRuns: prs,
-		Pipelines:    ps,
-		Tasks:        ts,
-	}
-
-	testAssets, cancel := getPipelineRunController(t, d)
-	defer cancel()
-	c := testAssets.Controller
-	clients := testAssets.Clients
-
-	for _, pr := range prs {
-		err := c.Reconciler.Reconcile(context.Background(), fmt.Sprintf("%s/%s", pr.GetNamespace(), pr.GetName()))
-		if err != nil {
-			t.Errorf("Did not expect to see error when reconciling completed PipelineRun but saw %s", err)
-		}
-
-		// Check that the PipelineRun was reconciled correctly
-		_, err = clients.Pipeline.Tekton().PipelineRuns(pr.GetNamespace()).Get(pr.GetName(), metav1.GetOptions{})
-		if err != nil {
-			t.Fatalf("Somehow had error getting completed reconciled run out of fake client: %s", err)
-		}
-	}
-
-	expectedTaskRuns := []*v1alpha1.TaskRun{
-		tb.TaskRun("test-pipeline-run-deprecated-sa-0-deprecated-sa-0-9l9zj", "foo",
-			tb.TaskRunOwnerReference("PipelineRun", "test-pipeline-run-deprecated-sa-0",
-				tb.OwnerReferenceAPIVersion("tekton.dev/v1alpha1"),
-				tb.Controller, tb.BlockOwnerDeletion,
-			),
-			tb.TaskRunSpec(
-				tb.TaskRunTaskRef("hello-world-task"),
-				tb.TaskRunServiceAccountName("sa-0"),
-			),
-			tb.TaskRunLabel("tekton.dev/pipeline", "test-sa-0"),
-			tb.TaskRunLabel("tekton.dev/pipelineRun", "test-pipeline-run-deprecated-sa-0"),
-			tb.TaskRunLabel("tekton.dev/pipelineTask", "deprecated-sa-0"),
-		),
-		tb.TaskRun("test-pipeline-run-sa-1-sa-1-mz4c7", "foo",
-			tb.TaskRunOwnerReference("PipelineRun", "test-pipeline-run-sa-1",
-				tb.OwnerReferenceAPIVersion("tekton.dev/v1alpha1"),
-				tb.Controller, tb.BlockOwnerDeletion,
-			),
-			tb.TaskRunSpec(
-				tb.TaskRunTaskRef("hello-world-task"),
-				tb.TaskRunServiceAccountName("sa-1"),
-			),
-			tb.TaskRunLabel("tekton.dev/pipeline", "test-sa-1"),
-			tb.TaskRunLabel("tekton.dev/pipelineRun", "test-pipeline-run-sa-1"),
-			tb.TaskRunLabel("tekton.dev/pipelineTask", "sa-1"),
-		),
-		tb.TaskRun("test-pipeline-run-task-deprecated-sa-2-task-deprecated-sa-mssqb", "foo",
-			tb.TaskRunOwnerReference("PipelineRun", "test-pipeline-run-task-deprecated-sa-2",
-				tb.OwnerReferenceAPIVersion("tekton.dev/v1alpha1"),
-				tb.Controller, tb.BlockOwnerDeletion,
-			),
-			tb.TaskRunSpec(
-				tb.TaskRunTaskRef("hello-world-task"),
-				tb.TaskRunServiceAccountName("sa-2"),
-			),
-			tb.TaskRunLabel("tekton.dev/pipeline", "test-sa-2"),
-			tb.TaskRunLabel("tekton.dev/pipelineRun", "test-pipeline-run-task-deprecated-sa-2"),
-			tb.TaskRunLabel("tekton.dev/pipelineTask", "task-deprecated-sa-2"),
-		),
-		tb.TaskRun("test-pipeline-run-task-sa-3-task-sa-3-78c5n", "foo",
-			tb.TaskRunOwnerReference("PipelineRun", "test-pipeline-run-task-sa-3",
-				tb.OwnerReferenceAPIVersion("tekton.dev/v1alpha1"),
-				tb.Controller, tb.BlockOwnerDeletion,
-			),
-			tb.TaskRunSpec(
-				tb.TaskRunTaskRef("hello-world-task"),
-				tb.TaskRunServiceAccountName("sa-3"),
-			),
-			tb.TaskRunLabel("tekton.dev/pipeline", "test-sa-3"),
-			tb.TaskRunLabel("tekton.dev/pipelineRun", "test-pipeline-run-task-sa-3"),
-			tb.TaskRunLabel("tekton.dev/pipelineTask", "task-sa-3"),
-		),
-	}
-
-	for _, taskRun := range expectedTaskRuns {
-		// Check that the expected TaskRun was created
-		actual, err := clients.Pipeline.Tekton().TaskRuns(taskRun.GetNamespace()).Get(taskRun.GetName(), metav1.GetOptions{})
-		if err != nil {
-			t.Fatalf("Expected a TaskRun to be created, but it wasn't: %s", err)
-		}
-		if d := cmp.Diff(actual, taskRun); d != "" {
-			t.Errorf("expected to see TaskRun %v created. Diff %s", taskRun, d)
-		}
-
-	}
-
-}
-
 func TestReconcileWithTimeoutAndRetry(t *testing.T) {
 
 	tcs := []struct {
diff --git a/pkg/reconciler/taskrun/entrypoint/entrypoint.go b/pkg/reconciler/taskrun/entrypoint/entrypoint.go
index afe21890e0d..73d5431393e 100644
--- a/pkg/reconciler/taskrun/entrypoint/entrypoint.go
+++ b/pkg/reconciler/taskrun/entrypoint/entrypoint.go
@@ -232,7 +232,7 @@ func getRemoteImage(image string, kubeclient kubernetes.Interface, taskRun *v1al
 
 	kc, err := k8schain.New(kubeclient, k8schain.Options{
 		Namespace:          taskRun.Namespace,
-		ServiceAccountName: taskRun.GetServiceAccountName(),
+		ServiceAccountName: taskRun.Spec.ServiceAccountName,
 	})
 	if err != nil {
 		return nil, xerrors.Errorf("Failed to create k8schain: %w", err)
diff --git a/pkg/reconciler/taskrun/entrypoint/entrypoint_test.go b/pkg/reconciler/taskrun/entrypoint/entrypoint_test.go
index 9f122d2b48f..0b3cd2c2fa9 100644
--- a/pkg/reconciler/taskrun/entrypoint/entrypoint_test.go
+++ b/pkg/reconciler/taskrun/entrypoint/entrypoint_test.go
@@ -401,8 +401,7 @@ func TestGetRemoteEntrypointWithNonDefaultSA(t *testing.T) {
 	for _, tt := range []func(taskRun *v1alpha1.TaskRun) *v1alpha1.TaskRun{
 		func(tr *v1alpha1.TaskRun) *v1alpha1.TaskRun { return tr },
 		func(tr *v1alpha1.TaskRun) *v1alpha1.TaskRun {
-			tr.Spec.ServiceAccountName = ""
-			tr.Spec.DeprecatedServiceAccount = "some-other-sa"
+			tr.Spec.ServiceAccountName = "some-other-sa"
 			return tr
 		},
 	} {
diff --git a/pkg/reconciler/taskrun/resources/pod.go b/pkg/reconciler/taskrun/resources/pod.go
index ea91c07b40a..dae177ff744 100644
--- a/pkg/reconciler/taskrun/resources/pod.go
+++ b/pkg/reconciler/taskrun/resources/pod.go
@@ -113,7 +113,7 @@ func MakePod(images pipeline.Images, taskRun *v1alpha1.TaskRun, taskSpec v1alpha
 	var initContainers []corev1.Container
 	var volumes []corev1.Volume
 
-	if credsInitContainer, secretsVolumes, err := pod.CredsInit(images.CredsImage, taskRun.GetServiceAccountName(), taskRun.Namespace, kubeclient, implicitVolumeMounts, implicitEnvVars); err != nil {
+	if credsInitContainer, secretsVolumes, err := pod.CredsInit(images.CredsImage, taskRun.Spec.ServiceAccountName, taskRun.Namespace, kubeclient, implicitVolumeMounts, implicitEnvVars); err != nil {
 		return nil, err
 	} else if credsInitContainer != nil {
 		initContainers = append(initContainers, *credsInitContainer)
@@ -280,7 +280,7 @@ cat > ${tmpfile} << '%s'
 			RestartPolicy:      corev1.RestartPolicyNever,
 			InitContainers:     initContainers,
 			Containers:         mergedPodContainers,
-			ServiceAccountName: taskRun.GetServiceAccountName(),
+			ServiceAccountName: taskRun.Spec.ServiceAccountName,
 			Volumes:            volumes,
 			NodeSelector:       taskRun.Spec.PodTemplate.NodeSelector,
 			Tolerations:        taskRun.Spec.PodTemplate.Tolerations,
diff --git a/pkg/reconciler/taskrun/resources/pod_test.go b/pkg/reconciler/taskrun/resources/pod_test.go
index 73ae0d478f0..da8fc9b832d 100644
--- a/pkg/reconciler/taskrun/resources/pod_test.go
+++ b/pkg/reconciler/taskrun/resources/pod_test.go
@@ -137,49 +137,6 @@ func TestMakePod(t *testing.T) {
 			}},
 			Volumes: append(secretsVolumes, implicitVolumes...),
 		},
-	}, {
-		desc: "with-deprecated-service-account",
-		ts: v1alpha1.TaskSpec{
-			Steps: []v1alpha1.Step{{Container: corev1.Container{
-				Name:  "name",
-				Image: "image",
-			}}},
-		},
-		trs: v1alpha1.TaskRunSpec{
-			DeprecatedServiceAccount: "service-account",
-		},
-		want: &corev1.PodSpec{
-			ServiceAccountName: "service-account",
-			RestartPolicy:      corev1.RestartPolicyNever,
-			InitContainers: []corev1.Container{{
-				Name:    "credential-initializer-mz4c7",
-				Image:   credsImage,
-				Command: []string{"/ko-app/creds-init"},
-				Args: []string{
-					"-basic-docker=multi-creds=https://docker.io",
-					"-basic-docker=multi-creds=https://us.gcr.io",
-					"-basic-git=multi-creds=github.com",
-					"-basic-git=multi-creds=gitlab.com",
-				},
-				VolumeMounts: append(implicitVolumeMounts, secretsVolumeMounts...),
-				Env:          implicitEnvVars,
-			}},
-			Containers: []corev1.Container{{
-				Name:         "step-name",
-				Image:        "image",
-				Env:          implicitEnvVars,
-				VolumeMounts: implicitVolumeMounts,
-				WorkingDir:   workspaceDir,
-				Resources: corev1.ResourceRequirements{
-					Requests: corev1.ResourceList{
-						corev1.ResourceCPU:              resource.MustParse("0"),
-						corev1.ResourceMemory:           resource.MustParse("0"),
-						corev1.ResourceEphemeralStorage: resource.MustParse("0"),
-					},
-				},
-			}},
-			Volumes: append(secretsVolumes, implicitVolumes...),
-		},
 	}, {
 		desc: "with-pod-template",
 		ts: v1alpha1.TaskSpec{
diff --git a/pkg/reconciler/taskrun/taskrun_test.go b/pkg/reconciler/taskrun/taskrun_test.go
index e83f291eec6..41ac70fc41c 100644
--- a/pkg/reconciler/taskrun/taskrun_test.go
+++ b/pkg/reconciler/taskrun/taskrun_test.go
@@ -432,9 +432,6 @@ func TestReconcile(t *testing.T) {
 	taskRunWithSaSuccess := tb.TaskRun("test-taskrun-with-sa-run-success", "foo", tb.TaskRunSpec(
 		tb.TaskRunTaskRef(saTask.Name, tb.TaskRefAPIVersion("a1")), tb.TaskRunServiceAccountName("test-sa"),
 	))
-	taskRunWithDeprecatedSaSuccess := tb.TaskRun("test-taskrun-with-deprecated-sa-run-success", "foo", tb.TaskRunSpec(
-		tb.TaskRunTaskRef(saTask.Name, tb.TaskRefAPIVersion("a1")), tb.TaskRunDeprecatedServiceAccount("", "test-deprecated-sa"),
-	))
 	taskRunTaskEnv := tb.TaskRun("test-taskrun-task-env", "foo", tb.TaskRunSpec(
 		tb.TaskRunTaskRef(taskEnvTask.Name, tb.TaskRefAPIVersion("a1")),
 	))
@@ -565,7 +562,7 @@ func TestReconcile(t *testing.T) {
 	)
 
 	taskruns := []*v1alpha1.TaskRun{
-		taskRunSuccess, taskRunWithSaSuccess, taskRunWithDeprecatedSaSuccess,
+		taskRunSuccess, taskRunWithSaSuccess,
 		taskRunSubstitution, taskRunInputOutput,
 		taskRunWithTaskSpec, taskRunWithClusterTask, taskRunWithResourceSpecAndTaskSpec,
 		taskRunWithLabels, taskRunWithAnnotations, taskRunWithResourceRequests, taskRunTaskEnv, taskRunWithPod,
@@ -644,38 +641,6 @@ func TestReconcile(t *testing.T) {
 				),
 			),
 		),
-	}, {
-		name:    "deprecated-serviceaccount",
-		taskRun: taskRunWithDeprecatedSaSuccess,
-		wantPod: tb.Pod("test-taskrun-with-deprecated-sa-run-success-pod-d406f0", "foo",
-			tb.PodAnnotation("tekton.dev/ready", ""),
-			tb.PodLabel(taskNameLabelKey, "test-with-sa"),
-			tb.PodLabel(taskRunNameLabelKey, "test-taskrun-with-deprecated-sa-run-success"),
-			tb.PodLabel(resources.ManagedByLabelKey, resources.ManagedByLabelValue),
-			tb.PodOwnerReference("TaskRun", "test-taskrun-with-deprecated-sa-run-success",
-				tb.OwnerReferenceAPIVersion(currentApiVersion)),
-			tb.PodSpec(
-				tb.PodServiceAccountName("test-deprecated-sa"),
-				tb.PodVolumes(toolsVolume, downward, workspaceVolume, homeVolume),
-				tb.PodRestartPolicy(corev1.RestartPolicyNever),
-				getPlaceToolsInitContainer(),
-				tb.PodContainer("step-sa-step", "foo",
-					tb.Command(entrypointLocation),
-					tb.Args("-wait_file", "/builder/downward/ready", "-post_file", "/builder/tools/0", "-wait_file_content", "-entrypoint", "/mycmd", "--"),
-					tb.WorkingDir(workspaceDir),
-					tb.EnvVar("HOME", "/builder/home"),
-					tb.VolumeMount("tools", "/builder/tools"),
-					tb.VolumeMount("downward", "/builder/downward"),
-					tb.VolumeMount("workspace", workspaceDir),
-					tb.VolumeMount("home", "/builder/home"),
-					tb.Resources(tb.Requests(
-						tb.CPU("0"),
-						tb.Memory("0"),
-						tb.EphemeralStorage("0"),
-					)),
-				),
-			),
-		),
 	}, {
 		name:    "params",
 		taskRun: taskRunSubstitution,
@@ -1219,7 +1184,7 @@ func TestReconcile(t *testing.T) {
 			defer cancel()
 			c := testAssets.Controller
 			clients := testAssets.Clients
-			saName := tc.taskRun.GetServiceAccountName()
+			saName := tc.taskRun.Spec.ServiceAccountName
 			if saName == "" {
 				saName = "default"
 			}
diff --git a/test/builder/pipeline.go b/test/builder/pipeline.go
index ccb37c49ff6..0b9f93eef8c 100644
--- a/test/builder/pipeline.go
+++ b/test/builder/pipeline.go
@@ -352,14 +352,6 @@ func PipelineRunServiceAccountName(sa string) PipelineRunSpecOp {
 	}
 }
 
-// PipelineRunServiceAccount sets the service account to the PipelineRunSpec.
-func PipelineRunDeprecatedServiceAccountName(sa, deprecatedSA string) PipelineRunSpecOp {
-	return func(prs *v1alpha1.PipelineRunSpec) {
-		prs.ServiceAccountName = sa
-		prs.DeprecatedServiceAccount = deprecatedSA
-	}
-}
-
 // PipelineRunServiceAccountTask configures the service account for given Task in PipelineRun.
 func PipelineRunServiceAccountNameTask(taskName, sa string) PipelineRunSpecOp {
 	return func(prs *v1alpha1.PipelineRunSpec) {
@@ -370,16 +362,6 @@ func PipelineRunServiceAccountNameTask(taskName, sa string) PipelineRunSpecOp {
 	}
 }
 
-// PipelineRunServiceAccountTask configures the service account for given Task in PipelineRun.
-func PipelineRunDeprecatedServiceAccountTask(taskName, sa string) PipelineRunSpecOp {
-	return func(prs *v1alpha1.PipelineRunSpec) {
-		prs.DeprecatedServiceAccounts = append(prs.DeprecatedServiceAccounts, v1alpha1.DeprecatedPipelineRunSpecServiceAccount{
-			TaskName:                 taskName,
-			DeprecatedServiceAccount: sa,
-		})
-	}
-}
-
 // PipelineRunParam add a param, with specified name and value, to the PipelineRunSpec.
 func PipelineRunParam(name string, value string, additionalValues ...string) PipelineRunSpecOp {
 	arrayOrString := ArrayOrString(value, additionalValues...)
diff --git a/test/builder/task.go b/test/builder/task.go
index bc13695f76d..ee4c715acc2 100644
--- a/test/builder/task.go
+++ b/test/builder/task.go
@@ -555,14 +555,6 @@ func TaskRunServiceAccountName(sa string) TaskRunSpecOp {
 	}
 }
 
-// TaskRunServiceAccount sets the serviceAccount to the TaskRunSpec.
-func TaskRunDeprecatedServiceAccount(sa, deprecatedSA string) TaskRunSpecOp {
-	return func(trs *v1alpha1.TaskRunSpec) {
-		trs.ServiceAccountName = sa
-		trs.DeprecatedServiceAccount = deprecatedSA
-	}
-}
-
 // TaskRunInputs sets inputs to the TaskRunSpec.
 // Any number of TaskRunInputs modifier can be passed to transform it.
 func TaskRunInputs(ops ...TaskRunInputsOp) TaskRunSpecOp {