In fact, my estimates are that our average cost basis for each of its properties is about $40,000.

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookI have a report a walk around the country and emerging markets email me for a copy,Paul

I have received estimates of $250,000 to cover most of the repairs. 

If so I wouldn't sweat it, maybe just deduct the cost of your visits for the estimates and research and return the rest.If your guys can't work and you're allowed to keep the deposit then use that to pay your crew and find something for them to do while you line up the next job.

I am finally ready to start buying properties to rehab/flip...I am looking for a General Contractor that could provide me with an estimate of costs.I would appreciate any recommendations.

I never pay a contractor for estimates.  

Is there a way to estimate this tax?

Then show the NOI, cap rate, rent ratio, break even ratio, etc... and then also show estimated for a leveraged purchase.

What have you estimated on the repairs, if any?

It's in my blood.That being said alot of the "gurus" on here have read the "Millionaire Fastlane" and have realized that they can accumulate wealth faster (and sometimes easier) doing something else as the author says that RE is a Slow Lane process.