Material cost Multiply by 2 to get the labor cost. 

Using financing would let you multiply your money’s effectiveness by a factor of 4.  

The benefit is that you'd defer your capital gains tax (~37% in California) for 30 years, allowing the saved tax dollars to be re-invested and multiply before you need to pay the tax in 30 years.

One book I was reading spoke about multiplying your net loss by your effective tax rate and using that number to offset your income.

Additional good news for you: because VA disability is 100% tax-free, it is ‘plussed-up’ when calculating your gross income…so say your disability pay rate is $4,000 as you said, they multiply it by 1.25 so the gross income used would be $5,000 not the $4,000.

If you try to save a couple of bucks and do it yourself there will almost always be critters left over that multiply. 

Also, I have seen a lot of posters that hold each individual to the rent multiplier.

Holding Costs are calculated by taking the monthly holding costs multiplied the number of months you plan on holding the property:Total Holding Costs = Monthly Holding Costs x # of Months HeldHere are some typical holding costs: Loan Payments- Monthly interest payments if you are getting outside funding for the projectProperty Taxes - Property taxes will vary depending on your local property tax rates.

Especially in a fourplex when they can talk to one another and the problems will multiply.

@Basit Siddiqi  500K down - ROI consisted of 2.5% appreciation(No guarantee), principal reduction (guaranteed), and reduction in 2023 passive gain taxes multiplied by my effective tax rate(guaranteed).