The problem is tax tables become out of date each year as tax rates and/or CPI indexed thresholds change (such as Medicare, HELP and SFSS). MYOB Australia seems to have adopted a sales strategy based on tax tables which annoys many users. New tax tables are not separately available from MYOB. Users must upgrade to a new version or subscribe to their fairly pricey support program called Cover (now AccountRight Live) to receive the latest 'pay2myob.bin' file as part of the Compliance Updates.
To support this strategy, since Accounting Plus™ Version 14 and Premier® Version 8, the 'pay2myob.bin' file has been specially formatted so you can no longer manually edit it as tax rates change. Additionally, each version is formatted differently, so you can't use a 'pay2myob.bin' file formatted for Version 19 with say Version 16.
With the Mac version (AccountEdge®) the tax table file is called MYOB Tax Tables or in v9 to 11.5 has a .tax extension. Everything else though is the same and all the comments here apply equally to the Mac version.