What would you pay to live in a duplex?

Most buyers guess. Run the real number instead. Enter a Twin Cities duplex price, what you plan to put down, and what the other unit rents for. The calculator shows what actually comes out of your pocket every month once the tenant has paid.

A worked example: a $400,000 Northeast Minneapolis duplex

Say you buy a side-by-side duplex for $400,000 with an FHA loan at 3.5 percent down. That is about $14,000 down, leaving a loan near $386,000. At a 6.5 percent rate the principal and interest run roughly $2,440 a month. Add about $383 for property taxes, $150 for insurance and $177 for FHA mortgage insurance and the full payment lands near $3,150.

The other unit rents for $1,500, so your real cost to live in the building is about $1,650 a month. That is in line with a two-bedroom rental in the same neighborhood, except you own the asset and someone else is paying most of the mortgage.

Now move out in year two and rent your side for $1,500 as well. The building brings in $3,000 against that $3,150 payment, and once you hold back 15 percent of the rent for vacancy, maintenance and capital items you are roughly $600 a month short. That is the honest answer at current rates: most Twin Cities duplexes do not cash flow the day you move out. What makes the deal work is the years you lived there cheaply, the principal you paid down, dropping mortgage insurance when you refinance, and rents that keep climbing. Price and rents are what move the needle, which is the whole point of running the numbers before you write an offer.

House hacking questions, answered

Found a duplex you like?

Send me the address and I will pull the real rent comps, check the tax and insurance numbers, and run the deal properly before you write an offer. Dan Anshus, Twin Cities duplex and multi-family specialist. dan@theduplexdan.com