1) You can’t put profit from from flip into 1031. 1031 is not for an ordinary income.2) no, reinvesting the profit into another property is not going to give you write off.

You should not be using someone else's prices (or Kukun's algorithm), you should be using your own prices from your local contractors and using the specific material selections you picked for your project.Here's an example of how bad some of the data is in Kukun and why it's not practical for investors that are wanting to create accurate estimates for their projects:I just added "Exterior Doors" to my project, and I was told that 4 single doors and 1 double door is $59,352 in Kansas City, MO which is 20x what I would actually pay as an investor.I believe the above was a bug, but nonetheless there was no way for me to fix this issue or understand why or how it was calculating this value.In summary, you don't need a fancy algorithm to tell you what something costs, you just need to know basic math and have a general understanding of how much materials cost and what contractors charge for specific repairs.For example, I have 5 exterior doors I need replaced (4 single entry doors, 1 french patio) this is how I would estimate the costs:- Single exterior door labor 4 x $250/each = $1,000- Single door material 4 x $300/each = $1,200- French patio door labor 1 x $400/each = $400- French patio door material 1 x $750/each = $750Total = $3,350Add 25% profit for your contractor and the quote should be around $5k for 5 doors.The hard part is finding out what your contractors charge, after that it's just basic math that you can do in a spreadsheet.

I added Value with the small details guests appreciate upon arrival & with the Luxurious, Exterior Patio space.

In this chapter: (1) "Broker"(A) means a person who, in exchange for a commission or other valuable consideration or with the expectation of receiving a commission or other valuable consideration, performs for another person one of the following acts:(i) sells, exchanges, purchases, or leases real estate;(ii) offers to sell, exchange, purchase, or lease real estate;(iii) negotiates or attempts to negotiate the listing, sale, exchange, purchase, or lease of real estate;(iv) lists or offers, attempts, or agrees to list real estate for sale, lease, or exchange;(v) auctions or offers, attempts, or agrees to auction real estate;(vi) deals in options on real estate, including a lease to purchase or buying, selling, or offering to buy or sell options on real estate;(vii) aids or offers or attempts to aid in locating or obtaining real estate for purchase or lease;(viii) procures or assists in procuring a prospect to effect the sale, exchange, or lease of real estate;(ix) procures or assists in procuring property to effect the sale, exchange, or lease of real estate;(x) controls the acceptance or deposit of rent from a resident of a single-family residential real property unit;(xi) provides a written analysis, opinion, or conclusion relating to the estimated price of real property if the analysis, opinion, or conclusion:(a) is not referred to as an appraisal;(b) is provided in the ordinary course of the person's business;(c) is related to the actual or potential management, acquisition, disposition, or encumbrance of an interest in real property;(xii) advises or offers advice to an owner of real estate concerning the negotiation or completion of a short sale;(B) includes a person who:(i) is employed by or for an owner of real estate to sell any portion of the real estate;(ii) engages in the business of charging an advance fee or contracting to collect a fee under a contract that requires the person primarily to promote the sale of real estate by:(a) listing the real estate in a publication primarily used for listing real estate;(b) referring information about the real estate to brokers.

Invest in high-yield dividend stocks (dividends reported as ordinary income, but be aware you will need to grow the account into the seven figure range to spin off enough dividends to qualify for a loan if this is your only source of income).

most everyone else has hit it here but I'll add that if your quick flipping than yes you are paying taxes and since you aren't holding for more than a year you are paying short term capital gains which are taxed at the same rate as ordinary income.   

Typically the income made is taxable as ordinary income.

Cap gains would be payable on the down payment received, and on the principle received each year, along with ordinary income on the interest received.  

If you do not adhere to the payback deadlines, the loan will be classified as a distribution and will be subject to your ordinary rate plus a 10% penalty assuming you do not meet the minimum age requirements.

Flips are classified as ordinary income subject to SE tax.