BRRRR works on paper and breaks on the refinance. The numbers to run before you make an offer, so you are not stuck with capital you cannot pull back out.
BRRRR, buy, rehab, rent, refinance, repeat, is the strategy that lets a small amount of capital recycle into multiple properties. It also breaks more often than its fans admit, almost always at the refinance, when the investor cannot pull their money back out and ends up stuck with cash trapped in a single deal. The fix is not optimism. It is running the numbers before you make the offer.
Here is the math that decides whether a BRRRR works, before you are committed to it.
Start at the end: the ARV
Everything in BRRRR keys off the after-repair value, what the property is worth once it is fixed. Get this wrong on the high side and every downstream number lies to you. Pull real comparable sales, not asking prices, for similar properties in the same area that actually sold in the last few months. Be conservative. A 10% miss on ARV can erase your entire profit and trap your capital.
The ARV is the foundation. If you are not confident in it, you are not ready to make the offer.
Work backward to the maximum offer
Lenders refinance at a percentage of ARV, often around 75%. That number is your ceiling for everything you put in: purchase plus rehab plus closing costs has to come in low enough that 75% of ARV pays it back. If your all-in cost exceeds what the refinance returns, the difference is cash stuck in the deal, the exact failure BRRRR is supposed to avoid.
Run it before you offer: ARV times the refinance percentage, minus rehab, minus closing and holding costs, is roughly the most you can pay and still pull your money out. Offer above that and you are buying a trap.
Budget the rehab like it will go over
Rehab budgets are optimistic by nature. The walls come open and the surprises arrive: the wiring, the plumbing, the thing the inspection missed. Pad the estimate, build in a contingency, and price the holding costs for a renovation that takes longer than planned, because it will. A deal that only works if the rehab is perfect is a deal that does not work.
Check that it cash-flows as a rental
The refinance is not the finish line. You are keeping this property and renting it, so the post-refinance payment has to leave room after the mortgage, taxes, insurance, vacancy, and maintenance. A property that pulls your capital back out but bleeds cash every month is not a win. Run the rental numbers at the new, larger loan balance, not the purchase price.
Stress-test before you commit
The deals that survive are the ones where the investor ran the bad case first: ARV comes in 10% low, rehab runs 20% over, the property sits vacant an extra month. If the deal still roughly works under that, it is real. If it only works when everything goes right, it is a gamble wearing a strategy's name.
This is too many moving numbers to do on a napkin, and napkin math is how trapped capital happens. The BRRRR Strategy Analyzer runs the full sequence, ARV, max offer, rehab, refinance pull-out, and post-refi cash flow, so you see whether your money comes back out before you write the offer. Pair it with the rental cash-flow calculator for the hold-phase numbers.
If you are newer to the broader strategy, the wholesale and investing fundamentals cover the deal-sourcing side, and the rest of the Real Estate Investing tools handle analysis, sellers, and contracts.
BRRRR is a great strategy and an unforgiving one. The investors who repeat it are the ones who ran the refinance math before the purchase, not after.