Refinancing is one of the most reliable ways credit unions grow both existing member relationships and new member acquisition. But most lending teams are working off intuition when it comes to a basic question: how much do you actually need to save someone before they’ll switch loans?
To find out, we examined 8,493 consumers who were offered auto loan refinance savings through the Clutch loan portal and looked at what it took to convert an offer into an accepted switch.
Two caveats are worth noting upfront. First, every consumer in this sample had already expressed interest in saving money, so their threshold to act likely skews lower than the general population. Second, offers were only shown where savings exceeded $15 per month, so the data doesn’t capture behavior at very low savings levels.
What a Typical Offer Looks Like
For each applicant, the Clutch loan portal generates multiple refinance offers, some with higher APR but lower monthly payments due to extended terms. Where both APR and monthly savings fell short of the threshold, no offer was shown at all.
Across the sample, the average credit score was 661, with a standard deviation of 81 – a solidly middle-of-the-road credit profile, not a pool skewed toward only the most qualified borrowers. Most offers landed around $30 in monthly savings and 2% in APR reduction. Among offers that were actually accepted, both figures shifted meaningfully higher, which is the first sign that bigger savings really do move behavior.
The Question That Matters: Dollars or APR?
To understand what actually drives a decision to switch, we looked at acceptance probability against the highest available savings offer for each consumer. A few patterns stood out.
On dollar savings:
- Even at low monthly savings ($0–$30), a subset of consumers still took action – likely because they were already actively shopping for a new auto loan, not because the offer alone convinced them.
- At the other end, a portion of consumers didn’t act even at very high monthly savings ($150+). At most, 75% of the studied population accepted an offer at any savings level – meaning a quarter of members simply won’t switch loans regardless of the number.
- The steepest gains in acceptance probability happened between $0 and $70 in monthly savings. Every additional dollar in that range meaningfully increased the likelihood of a switch.
- Above roughly $75–$100 in monthly savings, additional dollars stopped moving the needle. The willingness-to-switch curve plateaus.
On APR savings:
- Some consumers refinanced even at low APR savings, largely because extending the loan term still produced meaningful monthly dollar savings.
- Willingness to switch plateaued above roughly 5.00% APR savings—additional reduction beyond that point didn’t meaningfully change behavior.
- Notably, APR savings proved to be a stronger predictor of switching than dollar savings on their own, based on logistic regression modeling of the interaction between the two.
What This Means for Your Credit Union
If the goal is to convert more refinance-eligible members and prospects, the data points to a fairly specific playbook:
- Target $75+ in monthly savings as the threshold that maximizes acceptance without leaving unnecessary discount on the table. If the auto loan alone doesn’t get a member there, look at other balances on the credit file – credit cards, personal loans, student loans – to reach that number in aggregate.
- Lead with both dollars and APR, not just one. Consumers evaluate offers on both dimensions, and an offer that only stretches the term (lower payment, same or higher APR) tends to underperform, both for conversion and for the credit union’s own portfolio goals.
- Don’t assume more savings always means more conversion. Past the $75–$100 monthly and 5% APR marks, additional discounting mostly cuts into margin without meaningfully improving acceptance.
The Bottom Line
There’s a real, identifiable range where refinance offers convert best – and it’s narrower than most lending teams assume. Credit unions that can consistently hit that range, using both dollar and APR framing, are better positioned to win switches without over-discounting the ones they’d have won anyway.
Request a demo to learn how Clutch identifies the exact savings threshold that turns eligible members into funded refinances.