From Big Red Consulting:
IIF Transaction Creator converts worksheet data into IIF files for import into QuickBooks. As an Excel addin it integrates with Excel and is available directly from the menus in Excel. Several layout options are supported including a simple single-row layout and a more complex multi-row layout that resembles a QuickBooks Journal report. Examples are available from the IIF Creator's menu and can be used as templates. It automatically handles new list records such as new names, account, and items. It has options for handling different transaction layouts including single row, multi-row, and variants of these. You can create just one or thousands of transactions in your IIF files at a time. Automatic sales tax calculation for sales transactions and automatic name and account conflict resolution for easy import into QuickBooks.