Foreign income - different dates for tax year

[Fisher97]

I arrived in the U.S. in May 2024 and this is the first year I'll need to file a tax return here. I have foreign income (e.g. rental property) but the tax years there are different. For Australia, the tax year is 1 July - 30 June so I will not have details on the tax actually paid for July-December 2024 until the year ends, records received, AU tax return filed, processed by the Tax Office, etc. How can I calculate the tax payable by the U.S. deadline in April? (I know I can request a filing extension, but the tax needs to be paid by April.)