It’s a popular way for new investors to dip their toes into real estate because it allows you to generate rental income while reducing or even eliminating your monthly mortgage payment.While house hacking can be done with single-family homes (by renting out rooms), multifamily properties, such as duplexes, triplexes, and fourplexes, take the concept to the next level.

That's what house hacking is - getting roommates to pay as much of your mortgage payment as possible. 

I put 20% down through my local bank on the first mortgage.

., utilities, mortgage, etc.).

That $85k cash flow pretty quickly becomes $0 once you add a $1M mortgage to it at current rates. 

Inspection Costs - $400 Lender Fees - $1,000 Closing Costs - $2,000 Mortgage Payments - $2,500 Property Taxes - $600 Utilities - $1,000 Insurance - $200 Commissions - $4,000 Selling Closing Costs - $4,000 Home Warranty - $500 Termite Letter - $100 MLS Fees - $100 

With my mortgage eating half of my income, it sounds crazy to take a second one. 

Something to keep in mind though is that with the DSCR it is a new mortgage which entails higher closing costs as well as paying off any existing liens.

Deduct NEW property taxes after you buyDeduct home insurance costsDeduct maintenance percentage, typically 10%Deduct vacancy+tenant nonperformance percentage(we recommend 5% for Class A, 10% Class B, 20% Class C, good luck with Class D)Deduct whatever dollar/percentage of cashflow you wantNow, what you have left over is the amount for debt service.Enter it into a mortgage calculator, with current interest rate for an investment property, to determine your maximum mortgage amount.Divide the mortgage amount by either 75% or 80%, depending on the required down payment percentage - this is your tentative price to offer.If the property needs repairs, you'll want to deduct 110%-120% of the estimated repairs from this amount.Be sure to also research the ARV and make sure it's 10-20% higher than your tentative purchase price.As long as the ARV checks out, this is the purchase price to offer.It is probably significantly below the asking price.

is that it typically comes with higher rates on the first mortgage, if you're low income enough you might qualify for near free DPA but most DPA's open to all income brackets are typically at higher than market interest rates.