How the BRRRR math works
- Cash you put in = purchase price − purchase loan + closing + rehab + holding costs
- Refinance loan = ARV × the lender's loan-to-value (often 70–75% on a cash-out refi)
- Cash out at refinance = refinance loan − refi closing costs − paying off the purchase loan
- Cash left in the deal = cash put in − cash out. Zero or less means you got every dollar back.
- Monthly cash flow = rent − mortgage payment − taxes − insurance − vacancy, maintenance and management
- Cash-on-cash return = annual cash flow ÷ cash left in the deal
A worked example
The calculator opens on this deal: buy for $110,000 cash, $3,000 closing, $35,000 rehab and $4,000 holding. That's $152,000 in. It appraises at $210,000 and the bank lends 75%, which is $157,500. After $4,500 refi closing you get $153,000 back. That's all your cash out, plus $1,000.
Rented at $1,950, the 30-year loan at 7.25% costs $1,074 a month. Taxes, insurance and 21% of rent set aside for vacancy, maintenance and management cost another $700. That leaves about $176 a month of cash flow, with none of your own money left in the house, and $52,500 of equity.
Change the purchase price to $130,000 and $19,000 stays in the deal. The same $176 a month is then an 11.1% cash-on-cash return.
What makes a BRRRR work
- The all-in cost has to be low against the ARV. At 75% loan-to-value, you only get all your cash back if purchase, rehab, closing and holding come in under about 72% of the appraisal. The calculator shows your all-in percentage under the results.
- The rent has to carry the new, bigger loan. A cash-out refi means a larger mortgage. Check that the cash flow is still positive at today's rates, not the rate you hope for.
- Seasoning. Many lenders want you to own the property for 6–12 months before they lend on the new value. Budget the holding costs for that long.
- Reserves. Set aside maintenance and capex even in year one. Our defaults are 5% vacancy, 8% maintenance and 8% management.
If the numbers only work as a flip, compare them in the house flip calculator. To screen a deal fast, the MAO calculator gives you a quick max offer.
