Every additional lease multiplies calendar risk. Payment due dates, grace periods, escalations, rent reviews, early terminations, and renewal windows rarely sit in one system of record. Finance owns IFRS 16 maths; operations owns vendor relationships; legal owns amendments — and the shared truth is often a workbook that diverges from the signed PDF within a quarter.
Manual lease ops create predictable pain. Schedules are rebuilt when someone leaves. Partial payments are tracked in notes. Missed invoices surface only when a lessor escalates. Renewals arrive as surprises because the 60-day reminder lived in one person’s Outlook. Auditors ask for right-of-use and liability roll-forwards; teams spend nights reconciling contract extracts to the general ledger.
Portfolio complexity makes spreadsheets brittle: multi-currency schedules, step rents, residual values, subleases, and mid-term modifications. IFRS 16 does not forgive “we will clean it up at year end.” Controllers need continuous calculation discipline, not heroic close-week patches.
Lease ops or treasury typically owns day-to-day schedules; controllers own accounting policy choices; legal owns amendment authority; AP owns payment execution. Anti-patterns include treating extraction as “set and forget,” ignoring mid-term modifications until year-end, and running IFRS maths in a disconnected workbook while operations uses another calendar.
Automation here is not a chatbot over PDFs. It is lifecycle control: extract contract terms once, generate schedules, reconcile cash, escalate exceptions, and produce auditor-ready outputs without re-keying the portfolio every reporting cycle.