I have found that I can apply for business credit cards, which enable me to do renovations or pay for utilities over a period of time, while I save up for down payments or what have you.

Download all your bank transactions to excel for the period you want and then code them on there.

So I think you might have misinterpreted what it was saying and it  might make sense if you read the worksheets carefully - you do not include any period of non-qualified use that occurred after the last day that the taxpayer or spouse used the property as the principal residence during the 5-year period prior to the date of sale.

Then rehab the house and hopefully sell it within a three month period. 

What if all 3 of those identified replacement properties sell to other interested parties during the 180 day closing period and we never get any under contract?

Additionally, it can help maximize renovations and improvements.A Cost Segregation study is an IRS approved federal income tax tool that increases near term cash flow by utilizing shorter recovery periods for depreciation to accelerate return on investment.

I try to have a plan A, B, and C in place with tight acceptance and contingency periods. 

I tracked a 20 year period with a few properties and came in at 48%.

This could impact your cash flow, especially if your rental income margins are already tight.Another thing to consider is that a HELOC often has an interest-only payment period for the first 5-10 years.

It's awesome to see the progress you've made in such a short period of time!