All that being said, the finance costs of any financed transaction are expenses that reduce your taxable income and a prudent investor should weigh the costs vs. the speed of doing a deal more quickly and therefore being able to do more deals in a year. 

I’ll battle both sides for you:You’re taxable net profit is $6k, but your in the pocket net profit is $16k, almost 3 times as much. 

But landlords are cash not accrual You just don't record that income, which results in lower reportable/taxable income on your taxes. 

The biggest one is debt financing/refinance can cause a taxable transaction to occur.LLC or personal name.

In light of that, I would like to reduce my overall taxable income and thus overall tax rate, which is one of many reasons I'd like to put the money toward real estate. 

Don't do that unless you can do it at least a year ahead of the sale.However, after the exchange is complete a contribution into or distribution our of an entity to the members is not generally a taxable event. 

@Ryan Davis what @Chase Gochnauer is saying is that every municipality calculates taxes different and uses different formulas to asses a property's taxable value.

i.e. my W2 income plus the gain of the assets/buildings does not equal the "maximum taxable income" qualification of the rate chart. 

You can still take you profit and purchase another property, but the sale of the flip property is a taxable event.

The capital gain allocated to investment property is still taxable (does not qualify for tax-free treatment under Section 121) and the capital gain allocated toward the primary residence is tax-free up to the $250K/$500K limits.