Click this link for information on item 6 Tax withheld on the ATO website.
Tax Withheld amounts for Label U integrates from the Payment Summary schedule (PS).
You only complete this label if the amount was withheld in Australia and remitted to the ATO.
Show at label U the total amount of tax withheld from payments made to the partnership that were subject to foreign resident withholding (excluding capital gains). Do NOT include any share of foreign resident withholding (excluding capital gains) credits received by the partnership from another partnership or trust. These should be included at item 8.
If a credit is claimed at label U for tax withheld under foreign resident withholding (excluding capital gains), the corresponding gross payment must be shown at Item 5, Gross payments subject to foreign resident withholding (excluding capital gains) label B.
Only non-residents should complete this label. An Australian resident should not claim a foreign income tax offset at this label.