depends on
- original LVR (even if less than 100%, you still should allow for the opportunity cost of original equity)
- pre or post tax, and marginal tax rates
- how you treat capital expenditure
- how you treat depreciation (to me it shouldn't be considered a positive cash flow as it is a dedicated contigency for future replacement of the building, and if you don't spend it, you get taxed on it via it being subtracted from your cost base on disposal.)
I have a spreadsheet that does this.
Here's an example
Buy Price 300k
LVR 107% (includes LMI @ 10k, stamp duty, legals, inspections)
Loan 310k
Rate 5.5%
Rent 400*50 = 6.25% on purchase price
PM 7.5%mx, 1% letting
No capital expenditure
No depreciation allowance in tax
Owner 1 person on median income of 55k
Cash Flow for Yr 1
pre tax -$42
post tax +$4
Keep in mind a property that is CF- in the first year moves towards CF+ every year after, something the ATO is happy about.
The other issue is why you want to know CF status.
If it is to compare against other opportunities, then CF status is a different kettle when you use return on current equity and current debt, versus original investment and current debt.