Perform the same task in each app to ensure a fair comparison.Load a property with pictures and details.Market that property.See what your marketing looks like from the public's perspective.Submit a fake application to see how easy the process is.Run a credit/screening report on yourself.Enter a maintenance request, assign a vendor, and attach a fake invoice.Enter charges to the tenant's ledger.Enter recurring charges and automatic late fees.Sign documents electronically.Run owner reports.After testing a few apps, one should clearly stand out.

In my state, Virginia, full calendar-month notice is required with month-to-month, meaning full June rent is due June 1 unless notice was received by April 30, so there would be no rent credit due for any day in June with a May 12 notice. 

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Then what happens on paper a property looks like a cash flows very well, then when you add in vacancies repairs and life in general, they end up having to start using credit cards to pay for things and get caught into that spiral To answer your original question most real estate investors are not buying a property every year.

The Small Business Administration (SBA) defines Business Credit:Access to cash and credit is a business’s lifeline.

You may also claim a foreign tax credit if you pay local taxes on the rental income.

It really depends on how lendable you are without the 135k - job + savings + credit - if you want to parlay that money into more.

Credit score- the higher the best. 760-780+ generally gets best pricing for investment property loans with most lenders.

When it comes to qualifying for a loan like verifying your income, credit score, debt to in come ratio etc, will it help to say that I receive additional income from my househack tenants aside from my w2?