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Refinance Risk: What Happens If Rates Move Before You Refi

SFRCalc Editorial

Any strategy built around buying now and refinancing later — BRRRR most explicitly, but also a cash purchase you plan to leverage later, or a hard money bridge loan on any project — has a gap between the day you underwrote the deal and the day the refinance actually closes. Rates, appraisals, and lending standards can all move during that gap, and unlike the purchase price, none of them are locked in until the refinance actually closes.

The three things that can move

1. Interest rates

The refinance rate you underwrote at purchase is an assumption, not a commitment — nothing locks it in until you actually close the new loan, often months later. If rates rise during the rehab and hold period, the new mortgage payment comes in higher than planned, which directly reduces the cash flow the whole deal was underwritten around.

Same refinance loan amount, rate moves 1 point

Refinance loan: $172,500 at 7.25%, 30yr	$1,177/mo
Same loan at 8.25%, 30yr	$1,296/mo
Difference	−$119/mo

A one-point rate move on a $172,500 loan costs about $119 a month here — often enough to turn a modestly cash-flowing property into a break-even or negative one, without anything about the property itself changing.

2. The appraisal

Your after-repair value (ARV) estimate at purchase is your own number, informed by comps — the refinance appraisal is someone else's, and it's the one that actually counts. A conservative appraisal reduces the refinance loan amount directly (since it's usually capped at a loan-to-value percentage of appraised value), which reduces how much cash comes back out. This is the single most common reason BRRRR deals leave more cash in than originally planned.

3. Lending standards

DSCR minimums, maximum loan-to-value ratios, and documentation requirements aren't fixed — they shift with the broader lending environment. A refinance plan built around today's typical terms can run into tighter standards by the time you're ready to close, especially over a longer rehab timeline.

How to underwrite around it, not just hope around it

Stress-test the refinance rate. Run your numbers at both today's rate and a rate a point or more higher — if the deal only works at today's rate, that's real exposure, not a margin of safety.
Use a conservative ARV. Underwriting to a lower ARV than your optimistic comp-based estimate builds in room for a disappointing appraisal.
Keep the timeline tight and realistic. The longer the gap between purchase and refinance, the more time rates and standards have to move — padding the rehab timeline "to be safe" actually extends this exposure window.
Have a fallback if the refinance falls short. Know in advance whether you could carry the original financing longer, bring additional cash to the refinance, or hold the property as-is if the numbers come in worse than planned.

The purchase price is the only number in a buy-then-refinance strategy that's actually locked in on day one. Everything downstream of it — rate, appraisal, lending standards — is an assumption until the refinance closes. Underwrite accordingly.

Test how sensitive your deal is to a higher refinance rate or a lower ARV using the BRRRR calculator — adjust the refinance inputs and watch cash-left-in-deal and monthly cash flow respond.

This article is for general education and isn't financial or investment advice. Rates, appraisal outcomes, and lending standards are outside any investor's control and can change materially between purchase and refinance.