{"product_id":"n8n-leave-request-automation-google-sheets-gmail-gemini","title":"n8n Leave Request Automation: Google Sheets, Gmail \u0026 Gemini","description":"\u003ch3\u003eAutomate employee leave requests end-to-end with n8n—Google Sheets tracking, Gmail approvals, and Gemini-crafted manager emails\u003c\/h3\u003e\n\u003cp\u003eThis n8n workflow automatically captures leave requests from an \u003cstrong\u003en8n Form\u003c\/strong\u003e, checks leave balances in \u003cstrong\u003eGoogle Sheets\u003c\/strong\u003e, and routes approvals via \u003cstrong\u003eGmail\u003c\/strong\u003e. When a manager needs to approve, \u003cstrong\u003eGoogle Gemini\u003c\/strong\u003e drafts the approval email—and the workflow updates both the request status and balances in Sheets based on the manager’s email reply.\u003c\/p\u003e\n\n\u003ch3\u003eWhat this workflow does\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCollects submissions\u003c\/strong\u003e from an \u003cstrong\u003en8n Form\u003c\/strong\u003e, including employee, manager, date range, leave type, and reason.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eValidates leave balance\u003c\/strong\u003e by looking up the employee in the Google Sheets “\u003cstrong\u003eEmployee Data\u003c\/strong\u003e” spreadsheet and calculating requested days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRejects early when needed\u003c\/strong\u003e: if balance is insufficient, sends a rejection email to the employee using \u003cstrong\u003eGmail\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRequests approval when eligible\u003c\/strong\u003e: if balance is sufficient, uses \u003cstrong\u003eGoogle Gemini\u003c\/strong\u003e to generate a manager approval email and sends it to the manager via \u003cstrong\u003eGmail\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCreates\/updates tracking\u003c\/strong\u003e in the “\u003cstrong\u003eLeave Requests\u003c\/strong\u003e” Google Sheets spreadsheet with a generated request ID, status set to \u003cstrong\u003ePending\u003c\/strong\u003e, and the Gmail thread ID.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMonitors manager decisions\u003c\/strong\u003e: polls Gmail for the manager’s reply, extracts \u003cstrong\u003eAPPROVED\u003c\/strong\u003e\/\u003cstrong\u003eREJECTED\u003c\/strong\u003e, matches the request by Gmail thread ID, and updates status in Google Sheets.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDeducts leave on approval\u003c\/strong\u003e: when approved, subtracts the requested days from the employee’s leave balance in “\u003cstrong\u003eEmployee Data\u003c\/strong\u003e” by leave type.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eUse cases\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eHR or Ops teams managing leave approvals without manual spreadsheet updates.\u003c\/li\u003e\n  \u003cli\u003eSaaS operators standardizing leave workflows across departments using n8n automation.\u003c\/li\u003e\n  \u003cli\u003eAutomation engineers building an email-based approval loop tied to Google Sheets records.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGoogle Sheets\u003c\/strong\u003e: “Employee Data” and “Leave Requests” lookups, writes, and balance updates.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGmail\u003c\/strong\u003e: sending employee\/manager emails and using a Gmail Trigger to read manager replies.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGoogle Gemini\u003c\/strong\u003e: generates the manager approval email message.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003en8n logic\u003c\/strong\u003e: nodes such as \u003cstrong\u003eif\u003c\/strong\u003e, \u003cstrong\u003eset\u003c\/strong\u003e, \u003cstrong\u003ecode\u003c\/strong\u003e, \u003cstrong\u003eswitch\u003c\/strong\u003e, and \u003cstrong\u003esticky note\u003c\/strong\u003e (plus workflow control for email-thread matching).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSetup\u003c\/strong\u003e requires connecting Gmail credentials for sending and the Gmail Trigger, then connecting Google Sheets credentials and configuring document\/sheet IDs.\u003c\/p\u003e","brand":"N8N Commerce","offers":[{"title":"Default Title","offer_id":46206046372019,"sku":"N8N-20784","price":48.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6279\/6723\/files\/7TQr1OCFCj_mt4LFu2v4P_EOESrLar.png?v=1791796056","url":"https:\/\/buyflowscripts.com\/products\/n8n-leave-request-automation-google-sheets-gmail-gemini","provider":"N8N Commerce","version":"1.0","type":"link"}