I spoke with 2nd lien holder via phone and they informed me they will require some payment to approve short sale.

Those are the people that I think will either validate or make you re-evaluate your calculations.Try not to make pleasing the seller an issue with financing, If you go trying to support a 10 year mortgage when you don't have the financial cushion set aside or cash flow generated for repairs, CAPX, evictions etc. 

Can you stop making repairs to the property if your car breaks down or you have reduced working hours?

If you “closed” the deed should be recorded on your name, and any mtg/liens paid off.....don’t know why you would care.Please don’t tell me the seller’s contractor is supposed to be repairing “your” house after you closed.

Let's compare a simple wholesaler's deal to to the same deal as an exchangor:ARV is 200k,Repairs are 30k,As is value 150k,Purchase price is 70% of ARV minus repairs and 10k assignment fee so 100k.Wholesaler assigns contact and makes 10k..love it.Exchangor has same house worth 150k(as is value) that he/she owes 100k(contract price).

My background consists of 10 years of residential construction and appliance repair.

@Jose Pena I can tell you on the phone but you have to be really control freak....lolI have accounting background plus my first bachelors degree in engineering so I understand numbers and extremely detail oriented.

The only thing that's confusing me about this particular calculator is that it calculates "repairs" every month which bits into the profit.

One of the biggest mistakes I have seen less experienced investors do when choosing their first one or two flips is thinking they can save a lot of money by doing a lot of the repair or upgrading working on their own compared with paying a licensed contractor to do the work and mainly because a person doing the work themselves are not as experienced at doing good quality work and frequently will take a lot, a lot, a lot longer to get the work done and if you are financing your deal they you will end up paying a lot more in finance interest and still maybe end up with marginal instead of good quality work and you are only delaying the date for flipping , reselling, or being able to get a property rented.

Sellers want fast closings ,,as is ,,, good luck BTW, IF you do buy something, you can not just hire someone off the street for repairs, pulling permits, and  closing the POS,.