I use Stessa for accounting, I love it, it links right to my bank account/credit card accounts and I can assign purchases to different properties and units of the property for multi-unit properties and at the end of the year I have a simple report to give my tax professional 

Two of the units have their own W/D. 4 others share a separate W/D so it isn't taxed very much.

If you have a regarded tax entity, e.g. partnership, S Corp, C Corp, you need complete financials -- P&L and balance sheet to adequately prepare the tax returns and answer tax related questions. 

If you need financial help, ask under the "Finance, Tax, and Legal" forum.

Imagine a $185K income earner ($100K after tax) having a $600K mortgage.

If you need financial help, ask under the "Finance, Tax, and Legal" forum.

Don't forget your taxes on a sale!

Your also spending 4-5k a year in taxes on a 90k house. 

If you want more cash flow and want to walk away with more of the 80%, perhaps identify another market and do a 1031 exchange so as to not pay capital gains taxes.  

This was a few years ago, but at that time as I recall they were looking to do more long-term property leases over owning properties and doing pretty landlord friendly leases where they would do repairs and even pay property taxes.