I still see deals where the investors have a 35% margin excluding selling costs so there are still deals available.

Thanks to BP I had enough margins in the deal to still make a profit.

Please note that I don't know how plausible they all are so feel free to comment:1) Write it into the offer that the eviction process has to be completed by closing, else I can walk.2) Ask for money back at closing to cover any fees plus unforeseen damages to the property.3) Walk away and find something else.Oh great, now I can't figure out how to get my margins back to what they were before....anyway, I haven't made an offer yet.

If your margins are that thin you can't outsource some basic maintenance you haven't bought right. 

If you've done your math, added all of your safety margins, made an offer, and the deal doesn't work out, on to the next!  

Just keep true to your margins and don't forget to add in a bit for "surprises" :)

This may not be feasible without more specifics on my taxes but perhaps a rough formula on how I could figure it out.My basic thought process with the math would be the following:For every extra $1.50 I make above $100k (but below $150k); I lose $0.75 I can write off.So here is where my knowledge really breaks down (if it hasn't already unbeknownst to me).So for every $0.75 I lose the ability to write off as a passive loss; will this cost me $0.75 or will it cost me $0.75 times my marginal tax bracket of 28%, which would be $0.75 x 0.28 = $0.21And if it cost me $0.21 per $0.75 and therefore $0.41 per $1.5, that would basically bring my OT down from 1.5x base pay to roughly 1.1x base pay?

I would bump up maintenance and cap ex to AT LEAST 10% each, more if want margin of safety.

On our first property we also built our first vaction rental and we have now shifted our focus due to the higher margins we were finding on our vacation rental.  

The plan is subject to UDFI on other leveraged investments not secured by real property such as margin trading in stocks.A Solo 401k is subject to Unrelated Business Income Tax (UBIT) when engaging in a trade or business activity on a regular or repeated basis - as opposed to receiving passive income.