diff --git a/web/src/components/projects/pm-wizard-hooks.ts b/web/src/components/projects/pm-wizard-hooks.ts
index 2d29ffe6..7b8ee9d1 100644
--- a/web/src/components/projects/pm-wizard-hooks.ts
+++ b/web/src/components/projects/pm-wizard-hooks.ts
@@ -444,6 +444,46 @@ export function useTrelloCustomFieldCreation(
 	return { createCustomFieldMutation };
 }
 
+// ============================================================================
+// JIRA Custom Field Creation
+// ============================================================================
+
+export function useJiraCustomFieldCreation(
+	state: WizardState,
+	dispatch: React.Dispatch<WizardAction>,
+) {
+	const createJiraCustomFieldMutation = useMutation({
+		mutationFn: () => {
+			if (!state.jiraEmailCredentialId || !state.jiraApiTokenCredentialId || !state.jiraBaseUrl) {
+				throw new Error('Missing JIRA credentials or base URL');
+			}
+			return trpcClient.integrationsDiscovery.createJiraCustomField.mutate({
+				emailCredentialId: state.jiraEmailCredentialId,
+				apiTokenCredentialId: state.jiraApiTokenCredentialId,
+				baseUrl: state.jiraBaseUrl,
+				name: 'Cost',
+			});
+		},
+		onSuccess: (field) => {
+			dispatch({ type: 'ADD_JIRA_PROJECT_CUSTOM_FIELD', field: { ...field, custom: true } });
+			dispatch({ type: 'SET_JIRA_COST_FIELD', id: field.id });
+		},
+		onError: (error) => {
+			console.error('Failed to create JIRA custom field:', error);
+			const message = error instanceof Error ? error.message : String(error);
+			if (message.includes('403') || message.toLowerCase().includes('admin')) {
+				alert(
+					'Failed to create custom field: JIRA admin permissions are required to create global custom fields. Please contact your JIRA administrator.',
+				);
+			} else {
+				alert(`Failed to create JIRA custom field: ${message}`);
+			}
+		},
+	});
+
+	return { createJiraCustomFieldMutation };
+}
+
 // ============================================================================
 // Save Mutation
 // ============================================================================
diff --git a/web/src/components/projects/pm-wizard-jira-steps.tsx b/web/src/components/projects/pm-wizard-jira-steps.tsx
index bd09cfc6..0fc3b88e 100644
--- a/web/src/components/projects/pm-wizard-jira-steps.tsx
+++ b/web/src/components/projects/pm-wizard-jira-steps.tsx
@@ -1,10 +1,11 @@
 /**
  * JIRA-specific step renderer components for PMWizard.
  */
+import { Button } from '@/components/ui/button.js';
 import { Input } from '@/components/ui/input.js';
 import { Label } from '@/components/ui/label.js';
 import type { UseMutationResult } from '@tanstack/react-query';
-import { Loader2 } from 'lucide-react';
+import { Loader2, Plus } from 'lucide-react';
 import type { WizardAction, WizardState } from './pm-wizard-state.js';
 import { FieldMappingRow, InlineCredentialCreator, SearchableSelect } from './wizard-shared.js';
 import type { CredentialOption } from './wizard-shared.js';
@@ -148,10 +149,20 @@ export function JiraProjectStep({
 export function JiraFieldMappingStep({
 	state,
 	dispatch,
+	onCreateCostField,
+	creatingCostField,
 }: {
 	state: WizardState;
 	dispatch: React.Dispatch<WizardAction>;
+	onCreateCostField?: () => void;
+	creatingCostField?: boolean;
 }) {
+	const existingCostField = state.jiraProjectDetails?.fields.some(
+		(f) => f.name.toLowerCase() === 'cost',
+	);
+	const showCreateCostButton =
+		state.jiraProjectDetails && onCreateCostField && !state.jiraCostFieldId && !existingCostField;
+
 	return (
 		<div className="space-y-6">
 			{/* Status mappings */}
@@ -267,7 +278,29 @@ export function JiraFieldMappingStep({
 
 			{/* Cost custom field */}
 			<div className="space-y-2">
-				<Label>Custom Field: Cost</Label>
+				<div className="flex items-center justify-between">
+					<Label>Custom Field: Cost</Label>
+					{showCreateCostButton && (
+						<Button
+							type="button"
+							variant="outline"
+							size="sm"
+							onClick={onCreateCostField}
+							disabled={creatingCostField}
+							className="h-7 text-xs"
+						>
+							{creatingCostField ? (
+								<Loader2 className="h-3 w-3 animate-spin mr-1" />
+							) : (
+								<Plus className="h-3 w-3 mr-1" />
+							)}
+							Create
+						</Button>
+					)}
+				</div>
+				<p className="text-xs text-muted-foreground">
+					JIRA custom fields are global and require admin permissions to create.
+				</p>
 				{state.jiraProjectDetails ? (
 					<FieldMappingRow
 						slotLabel="cost"
diff --git a/web/src/components/projects/pm-wizard-state.ts b/web/src/components/projects/pm-wizard-state.ts
index a9dd7065..c5d19f7f 100644
--- a/web/src/components/projects/pm-wizard-state.ts
+++ b/web/src/components/projects/pm-wizard-state.ts
@@ -94,7 +94,8 @@ export type WizardAction =
 	| {
 			type: 'ADD_TRELLO_BOARD_CUSTOM_FIELD';
 			customField: { id: string; name: string; type: string };
-	  };
+	  }
+	| { type: 'ADD_JIRA_PROJECT_CUSTOM_FIELD'; field: { id: string; name: string; custom: boolean } };
 
 // ============================================================================
 // Initial state and constants
@@ -253,6 +254,15 @@ export const wizardReducer: Reducer<WizardState, WizardAction> = (state, action)
 					customFields: [...state.trelloBoardDetails.customFields, action.customField],
 				},
 			};
+		case 'ADD_JIRA_PROJECT_CUSTOM_FIELD':
+			if (!state.jiraProjectDetails) return state;
+			return {
+				...state,
+				jiraProjectDetails: {
+					...state.jiraProjectDetails,
+					fields: [...state.jiraProjectDetails.fields, action.field],
+				},
+			};
 		default:
 			return state;
 	}
diff --git a/web/src/components/projects/pm-wizard.tsx b/web/src/components/projects/pm-wizard.tsx
index 8a5e7512..3b66b46e 100644
--- a/web/src/components/projects/pm-wizard.tsx
+++ b/web/src/components/projects/pm-wizard.tsx
@@ -5,6 +5,7 @@ import { CheckCircle, Globe, Loader2, XCircle } from 'lucide-react';
 import { useEffect, useReducer, useState } from 'react';
 import { SaveStep, WebhookStep } from './pm-wizard-common-steps.js';
 import {
+	useJiraCustomFieldCreation,
 	useJiraDiscovery,
 	useSaveMutation,
 	useTrelloCustomFieldCreation,
@@ -73,6 +74,7 @@ export function PMWizard({
 	const [openSteps, setOpenSteps] = useState<Set<number>>(new Set([1]));
 	const [creatingSlot, setCreatingSlot] = useState<string | null>(null);
 	const [creatingCostField, setCreatingCostField] = useState(false);
+	const [creatingJiraCostField, setCreatingJiraCostField] = useState(false);
 
 	// ---- Step navigation helpers ----
 
@@ -123,6 +125,7 @@ export function PMWizard({
 		dispatch,
 	);
 	const { createCustomFieldMutation } = useTrelloCustomFieldCreation(state, dispatch);
+	const { createJiraCustomFieldMutation } = useJiraCustomFieldCreation(state, dispatch);
 	const webhookManagement = useWebhookManagement(projectId, state);
 	const { saveMutation } = useSaveMutation(projectId, state);
 
@@ -147,6 +150,13 @@ export function PMWizard({
 		});
 	};
 
+	const handleCreateJiraCostField = () => {
+		setCreatingJiraCostField(true);
+		createJiraCustomFieldMutation.mutate(undefined, {
+			onSettled: () => setCreatingJiraCostField(false),
+		});
+	};
+
 	const handleCreateAllMissingLabels = () => {
 		const existingLabelNames = new Set(
 			(state.trelloBoardDetails?.labels ?? []).map((l) => l.name.toLowerCase()),
@@ -320,7 +330,12 @@ export function PMWizard({
 						creatingCostField={creatingCostField}
 					/>
 				) : (
-					<JiraFieldMappingStep state={state} dispatch={dispatch} />
+					<JiraFieldMappingStep
+						state={state}
+						dispatch={dispatch}
+						onCreateCostField={handleCreateJiraCostField}
+						creatingCostField={creatingJiraCostField}
+					/>
 				)}
 			</WizardStep>