Final answer:
The step that QuickBooks Online completes automatically after you save a form is the posting step in the accounting cycle, updating the general ledger and financial statements in real time.
Step-by-step explanation:
When you save a form in QuickBooks Online, the software automatically completes the posting step of the accounting cycle. This step involves recording financial transactions in the appropriate accounts within the software's general ledger. QuickBooks Online streamlines this process by automatically categorizing transactions based on the information entered in the form and instantly updating the financial statements, such as the balance sheet and income statement. Therefore, the user does not need to manually post entries to ledgers, as is required in manual accounting processes, allowing for real-time financial reporting and accuracy.