My returns are based on full cash purchase of the properties, as it is hard to compare the attractiveness of properties at different price ranges when only calculating down payment or properties that need very little rehab/updates. I did think about the scores assigned to each factor, but I believe tax deductions are a SIGNIFICANT factor when comparing passive income steams.
If a passive activity interest is transferred because the owner dies, unused passive activity losses are allowed (to a certain extent) as a deduction against the decedent's income in the year of death. The decedent's losses are allowed only to the extent they exceed the amount by which the transferee's basis in the passive activity has been increased under the rules for determining the basis of property acquired from a decedent. For example, if the basis of an interest in a passive activity in the hands of a transferee is increased by $6,000 and unused passive activity losses of $8,000 were allocable to the interest at the date of death, then the decedent's deduction for the tax year would be limited to $2,000 ($8,000 − $6,000).
A working interest in an oil or gas well which you hold directly or through an entity that doesn’t limit your liability (such as a general partner interest in a partnership). It doesn’t matter whether you materially participated in the activity for the tax year. However, if your liability was limited for part of the year (for example, you converted your general partner interest to a limited partner interest during the year) and you had a net loss from the well for the year, some of your income and deductions from the working interest may be treated as passive activity gross income and passive activity deductions. See Temporary Regulations section 1.469-1T(e)(4)(ii).

If you have a capital loss on the disposition of an interest in a passive activity, the loss may be limited. For individuals, your capital loss deduction is limited to the amount of your capital gains plus the lower of $3,000 ($1,500 in the case of a married individual filing a separate return) or the excess of your capital losses over capital gains. See Pub. 544 for more information.
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Additionally, if you wrote a book and receive royalty checks, that income is also passive and not subjected to self-employment taxes. But, if you write several books or make updates to an existing book (like this one) then you are materially participating in your activity and your income is earned income. And Yes, you would pay self-employment taxes on that income.
When I purchase an existing online business, I look for cash flow over the past year and where the money comes from. I want the sources to be more passive so that it does not take a lot of my time. Also, typically I will make an offer that is 18 – 24 months of profit so that I know that I will get my money back within the next two years. I hope that helps!
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