BRRRR strategy: the math with honest numbers

The five steps

1. Buy — distressed or value-add property, typically with hard-money or cash. The all-in basis (purchase + closing + initial holding) needs to be well below ARV.
2. Rehab — bring the property to a stabilized standard suitable for both renting AND for the appraisal that supports the eventual refinance.
3. Rent — execute a lease at market rent. Most refi lenders require 6 months of seasoning at the new value before refinancing.
4. Refinance — pull a cash-out refi based on the new appraised value. Conforming Fannie Mae cash-out on investment property is typically capped at 70–75% LTV.
5. Repeat — redeploy the recovered capital into the next acquisition.

The math when it works

Operator-grade BRRRR underwrite, target case:

Purchase price:                      $120,000
Acquisition closing costs (~3%):       $3,600
Rehab budget:                         $40,000
Rehab contingency (15%):               $6,000
Holding costs (4 months @ $1,200):     $4,800
                                    ─────────
All-in basis:                        $174,400

ARV (post-rehab appraised value):    $250,000

Refi at 75% LTV cash-out:            $187,500
Refi closing costs (~2%):             $3,750
                                    ─────────
Net cash recovered:                  $183,750

Capital remaining in deal:           $174,400 − $183,750
                                    = −$9,350  (all back, plus a little)

The deal recovers all the capital plus a small premium. New mortgage at $187,500, debt-coverage ratio depends on the rent number. If that DSCR works at 1.20× or above, the deal stays alive long-term. The investor moves the recovered capital to the next acquisition.

The math when it breaks

Same deal, three failure modes that all happen on actual BRRRR projects:

FAILURE MODE 1: Rehab runs over

Original rehab:    $40,000  +  15% contingency = $46,000
Actual rehab:      $58,000  (+25% over plan, common)
Extended hold:     7 months instead of 4 (+$3,600 holding)

Revised all-in basis: $189,800
Net cash recovered:   $183,750
Capital stuck:        $6,050   (still mostly works, less margin)


FAILURE MODE 2: Appraisal comes in light

Underwritten ARV:  $250,000
Actual appraisal:  $230,000  (8% under, common)

Refi at 75% LTV:   $172,500
Refi costs (~2%):  $3,450
Net cash:          $169,050

All-in basis:      $174,400  (target case)
Capital stuck:     $5,350   (workable)


FAILURE MODE 3: Refi LTV is 70%, not 75%

Many DSCR + non-conforming products max at 70% LTV
on small-balance investment property in 2026.

Refi at 70% LTV on $250K ARV:   $175,000
Refi costs (~2%):                $3,500
Net cash:                       $171,500

All-in basis:                   $174,400
Capital stuck:                    $2,900


COMBINED (all three): rehab over + light appraisal + 70% LTV

All-in basis:        $189,800
ARV:                 $230,000
Refi LTV:            70%
Net cash:            $157,540
Capital stuck:       $32,260

The combined failure mode leaves $32K stuck in the deal — which is still a deal (3.5% cash-on-cash on the stuck capital if the property cash-flows $1,200/month after debt service is a defensible answer), but it's not the "all your money back" version sold on the podcasts.

How to underwrite honestly

1. Stress-test ARV down 10%.Don't accept a single "best estimate" — pull the appraiser-grade comp set, identify what would make a real appraisal come in light (no garage, smaller sqft, partial finished basement), and underwrite the conservative case.
2. Pad rehab 20% even with an experienced GC. Permit upgrades, framing surprises, code requirements, and material price spikes show up on real projects. Investors who skip the contingency end up paying for it anyway, just without budget.
3. Plan for refi LTV at the conservative product tier.Conforming Fannie Mae 6-month-seasoning cash-out on investment property is the gold standard; if you can't qualify there, the DSCR alternative typically caps lower.
4. Hold-time slip is not optional. Add 30–60 days for permit + inspection + market time + the refi seasoning period. Carry-cost dollars during the slip eat real margin.
5. Underwrite the deal both ways.A defensible BRRRR works on the "all your money back" case AND on the "all three failure modes hit" case. If it only works on the optimistic case, it's not a BRRRR deal — it's a leveraged speculation.

Run the numbers yourself

The Rental Property Cash Flow Calculator handles the post-refi long-term economics. The dedicated BRRRR deal-modeler with refi-LTV-shortfall and rehab-overrun sensitivity is on the post-launch backlog (per Byron-confirmed scope expansion); when it ships it will sit at /calculators/brrrr.

Sources

• Fannie Mae Selling Guide §B6 — multifamily underwriting + DSCR
• Fannie Mae Selling Guide §B4-1 — appraisal requirements
• BiggerPockets BRRRR-strategy framework (named-source, secondary).
• Portfolio strategy methodology — BRRRR section