While the actual BAS shown in your GST centre can't be downloaded, your GST Summary Report can be filtered to the required date range and will show you the same information as your BAS summary. This can be downloaded to either PDF or Excel spreadsheet.
Click the Reports menu
Search and select the GST Summary Report
Input your required BAS period and select Run Report
In the top right had corner of the report, you will see an Export to PDF or Excel option
Please let me know if you require any further assistance, I'll be here to help.
-Kass
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