Finance teams often have the same reaction the first time a modified schedule starts showing extra rows: it looks as though the model has duplicated the payment. You change the payment date. You rerun the lease. Suddenly the lease liability schedule shows one row with no cash payment, then another row with the cash payment. If that pattern keeps showing up in later cycles, the immediate assumption is usually that the calculation has gone wrong. In the calculator's supported non-CPI modification workflow, that is often not an error. It is the schedule preserving two different timing boundaries at once: the accounting cut-off and the revised payment date. If you want to test that behavior against a live model, start with the IFRS 16 calculator , then compare the revised rows against the schedule logic below.…