diff --git a/packages/nodes-base/nodes/QuickBooks/GenericFunctions.ts b/packages/nodes-base/nodes/QuickBooks/GenericFunctions.ts
index a92b24b8ea..ab0024a763 100644
--- a/packages/nodes-base/nodes/QuickBooks/GenericFunctions.ts
+++ b/packages/nodes-base/nodes/QuickBooks/GenericFunctions.ts
@@ -329,9 +329,14 @@ export function processLines(this: IExecuteFunctions, lines: IDataObject[], reso
 					TaxCodeRef: {
 						value: line.TaxCodeRef,
 					},
+					Qty: line.Qty,
 				};
+				if (line.Qty === undefined) {
+					delete (line.SalesItemLineDetail as IDataObject).Qty;
+				}
 				delete line.itemId;
 				delete line.TaxCodeRef;
+				delete line.Qty;
 			}
 		}
 	});
diff --git a/packages/nodes-base/nodes/QuickBooks/__tests__/GenericFunctions.test.ts b/packages/nodes-base/nodes/QuickBooks/__tests__/GenericFunctions.test.ts
new file mode 100644
index 0000000000..9f7039d403
--- /dev/null
+++ b/packages/nodes-base/nodes/QuickBooks/__tests__/GenericFunctions.test.ts
@@ -0,0 +1,75 @@
+import type { IExecuteFunctions } from 'n8n-workflow';
+
+import { processLines } from '../GenericFunctions';
+describe('processLines', () => {
+	const mockExecuteFunctions: Partial<IExecuteFunctions> = {
+		getNodeParameter: jest.fn(),
+	};
+
+	test('should process AccountBasedExpenseLineDetail for bill resource', () => {
+		const lines = [{ DetailType: 'AccountBasedExpenseLineDetail', accountId: '123' }];
+
+		const result = processLines.call(mockExecuteFunctions as IExecuteFunctions, lines, 'bill');
+
+		expect(result).toEqual([
+			{
+				DetailType: 'AccountBasedExpenseLineDetail',
+				AccountBasedExpenseLineDetail: { AccountRef: { value: '123' } },
+			},
+		]);
+	});
+
+	test('should process ItemBasedExpenseLineDetail for bill resource', () => {
+		const lines = [{ DetailType: 'ItemBasedExpenseLineDetail', itemId: '456' }];
+
+		const result = processLines.call(mockExecuteFunctions as IExecuteFunctions, lines, 'bill');
+
+		expect(result).toEqual([
+			{
+				DetailType: 'ItemBasedExpenseLineDetail',
+				ItemBasedExpenseLineDetail: { ItemRef: { value: '456' } },
+			},
+		]);
+	});
+
+	test('should process SalesItemLineDetail for estimate resource', () => {
+		const lines = [{ DetailType: 'SalesItemLineDetail', itemId: '789', TaxCodeRef: 'TAX1' }];
+
+		const result = processLines.call(mockExecuteFunctions as IExecuteFunctions, lines, 'estimate');
+
+		expect(result).toEqual([
+			{
+				DetailType: 'SalesItemLineDetail',
+				SalesItemLineDetail: { ItemRef: { value: '789' }, TaxCodeRef: { value: 'TAX1' } },
+			},
+		]);
+	});
+
+	test('should process SalesItemLineDetail for invoice resource with Qty', () => {
+		const lines = [
+			{ DetailType: 'SalesItemLineDetail', itemId: '101', TaxCodeRef: 'TAX2', Qty: 10 },
+		];
+
+		const result = processLines.call(mockExecuteFunctions as IExecuteFunctions, lines, 'invoice');
+
+		expect(result).toEqual([
+			{
+				DetailType: 'SalesItemLineDetail',
+				SalesItemLineDetail: { ItemRef: { value: '101' }, TaxCodeRef: { value: 'TAX2' }, Qty: 10 },
+			},
+		]);
+	});
+
+	test('should process SalesItemLineDetail for invoice resource without Qty', () => {
+		const lines = [{ DetailType: 'SalesItemLineDetail', itemId: '202', TaxCodeRef: 'TAX3' }];
+
+		const result = processLines.call(mockExecuteFunctions as IExecuteFunctions, lines, 'invoice');
+
+		expect(result).toEqual([
+			{
+				DetailType: 'SalesItemLineDetail',
+				SalesItemLineDetail: { ItemRef: { value: '202' }, TaxCodeRef: { value: 'TAX3' } },
+			},
+		]);
+	});
+});
diff --git a/packages/nodes-base/nodes/QuickBooks/descriptions/Invoice/InvoiceDescription.ts b/packages/nodes-base/nodes/QuickBooks/descriptions/Invoice/InvoiceDescription.ts
index 8482828f69..6427fd61d7 100644
--- a/packages/nodes-base/nodes/QuickBooks/descriptions/Invoice/InvoiceDescription.ts
+++ b/packages/nodes-base/nodes/QuickBooks/descriptions/Invoice/InvoiceDescription.ts
@@ -148,6 +148,13 @@ export const invoiceFields: INodeProperties[] = [
 					loadOptionsMethod: 'getTaxCodeRefs',
 				},
 			},
+			{
+				displayName: 'Quantity',
+				name: 'Qty',
+				description: 'Number of units of the line item',
+				type: 'number',
+				default: 0,
+			},
 		],
 	},
 	{