In the case of an activity with respect to which any deductions or credits are disallowed for a taxable year (the loss activity), the disallowed deductions are allocated among your activities for the next tax year in a manner that reasonably reflects the extent to which each activity continues the loss activity. The disallowed deductions or credits allocated to an activity under the preceding sentence are treated as deductions or credits from the activity for the next tax year. For more information, see Regulations section 1.469-1(f)(4).
One of the biggest advantages of passive income is that it works when you aren’t working. The more passive the income, the less work that is involved at all. This appeals to my inherent laziness. But consider a high-powered surgeon. Sure, her hourly rate, while she is operating, is astronomical.  But as soon as she walks out of the OR, that income stream stops until she scrubs in again. Vacation? Not only is there no income stream, but there is likely a negative one due to overhead. When a passive earner is on vacation, that income stream, small as it may be in comparison to the surgeon, keeps right on working. Interest works both ways and as my kids know, interest should be something you get not something you pay. As J. Reuben Clark said nearly a century ago:

Good suggestions. I have many of these. One word about the “app” idea. I had a great idea related to personal taxes that I tried to get off the ground with my accountant as a partner. I would say it’s difficult to do this unless you have a coder on your team. Hiring someone is not really viable financially unless the app is simple. When we finally got the quote for a coder to write what we wanted (and after doing lots of mock ups ourselves and getting a demo for investors) the estimate was about 750k just to really get started.
The more I deal with ungrateful patients and have to be away from my family due to work, the more I become a huge fan of passive income. Every 6 months when I get a check for my UpToDate sections I worked on 4-5 years ago that only require periodic minor updates, I’m always reminded how nice passive income is. Rental properties are great too, but I completely agree that you must do your homework. There are a lot of bad rental properties that will not only fail to provide passive income, but can cost a great deal out of your own pocket.
Case Schiller only tracks price appreciation of RE. RE as rental investment vehicle is measured primarily on rental yield or cap rate or some other measure. Price appreciation in that scenario is only a secondary means of growth, and arguably should be ignored as a predictor of returns when deciding on whether or not to invest in rentals. More important key performance indicators for rentals are net operating income and cash ROI. Appreciation, if it occurs, is a bonus.
Because passive investors’ rentals are viewed as secondary income, they can only deduct the normal costs associated with their rental properties. They cannot deduct any home office expenses and are limited on how much they can deduct from any losses they might incur. As of 2010, you can only deduct up to $3,000 from your other active income like your job or employment.
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.
Haha, that is too funny. I wanted to make an app back in the day called “MyShares” (You can probably tell how I cam up with the name at the time). The idea was that I would loan out books and DVD’s and then would never get them back. Then I thought, how cool would it be if I could rent those items out and that would motivate people to bring them back. Obviously, books and DVD’s are cheap, so this isn’t the money maker. The idea that would probably make the most money would be things like tools, ATVs, etc.
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