Earlier this year, pharmacy technician Curtis Webb thought his credit score was high enough to help him snag good terms on a mortgage.
"It was close to 730. I thought it would help me get a good interest rate," said Webb, 28, a Utah resident.
"Then the lender came back with my actual score," he said. "I was shocked."
The underwriter had checked Webb's "classic" FICO score, which was more than 40 points lower than the score he'd been monitoring online. The lower score meant a higher interest rate, making the loan a more expensive prospect.
That scenario is common, experts say. Consumers can retrieve a credit score online that may not be the one that's used when they actually apply for a loan. And while the discrepancy might not always be significant — or could be in your favor — some industry watchers say the differences are confusing at best and misleading at worst.
"Consumers don't even know what score they're looking at, or if it's the one used by lenders," said Al Bingham, a credit expert and author of "The Road to 850."
"In most cases, it's not," he said.
The credit-scoring world is a complex one, despite many consumers thinking their score is a number that is the same — or at least very similar — no matter where it's presented.
"It's unrealistic to expect that a number, whether from a website or credit bureau or anywhere else, will be the same number that some future lender is going to use," said John Ulzheimer, a credit expert and president of The Ulzheimer Group in Atlanta. "If it is identical, chalk it up to luck."
FICO scores are considered the most widely used numbers in lending decisions across consumer loans and lines of credit. The company says its scores are used in 90% of lending decisions, based on data audited by a third party.
VantageScore, meanwhile, says that 2,800 organizations (including 2,500 financial institutions) used close to 10.5 billion of its scores from July 2017 through June 2018, based on a study by global consulting firm Oliver Wyman. Most of that usage, though, came from credit card companies managing existing accounts and prescreening applicants.
Webb, the Utah resident, had been monitoring his score on personal finance website Credit Karma, which provides scores from the VantageScore model. That's a joint venture among the nation's three biggest credit-reporting firms: Experian, Equifax and TransUnion.
The VantageScore was created in 2006 as a competitor to FICO, which has been around since 1989. Both brands use similar data to compute your number — including things like outstanding debt, payment history and other financial tidbits that help predict whether you'll repay what you borrow. The most familiar versions of both VantageScore and FICO result in a score that falls on a scale of 300 to 850.
However, the specific algorithms used to arrive at your numbers are different. And both brands have multiple versions — upgraded editions, often — which also contribute to variations in the scores that you see. Even the credit-reporting companies can provide same-named scores that differ from one to the next, due to differences in the information reported or the timing of it.
Of course, regardless of the score used, lenders also typically weigh additional items including income, length of employment, stable housing or other aspects of your financial life that don't show up in your credit report or get reflected in your score.
Yet as many consumers know, the higher your score, the better terms you can get on loans and credit cards, including the interest rate — which can save a lot of money in interest over the life of a loan.
For illustration: On a $160,000 mortgage, paying 4% over 30 years incurs $115,280 in interest. Just a half-percentage point higher, 4.5%, would yield $132,128 in interest over the same period — $16,848 more.
FICO Score Factors:
Most influential: Payment history on loans and credit cards
Highly influential: Total debt and amounts owed
Moderately influential: Length of credit history
Less influential: New credit and credit mix (the types of accounts you have)
Most influential: Payment history
Highly influential: Age and type of credit, percent of credit limit used
Moderately influential: Total balances and debt
Less influential: Recent credit behavior and inquiries, available credit
Consumers often see the biggest discrepancy in scores when they apply for a mortgage, experts say.
Fannie Mae and Freddie Mac, the largest purchasers of home mortgages on the secondary market, rely on a consumer's classic FICO score. As such, lenders generally follow their guidelines to ensure their loans can be resold to investors.
Last month, however, the Federal Housing Finance Agency issued a final rule that allows Fannie and Freddie to employ alternative models— which means VantageScore could be considered by those government-sponsored enterprises.
It's an about-face from the originally proposed version of the rule, released in December, which would have banned Fannie or Freddie from using a model owned in part by the company providing the credit score. That would have eliminated VantageScore due to its ownership by the three largest credit-reporting companies, which provide the scores that end up at Fannie and Freddie.
Whether the policy change would allow VantageScore to gain traction any time soon is uncertain, partly because FICO scores are so embedded in how lenders assess consumers' ability to handle their debt, Bingham said.
"The lending industry relies on the FICO scores and that's a big industry to change course," he said. "Lenders, insurers and investors are ultimately the consumer for credit scores. It's their money at risk."
Meanwhile, a VantageScore spokesman said the important thing for consumers to pay attention to is their number and whether it's improving or getting worse.
"If you're monitoring your score, that's a good thing," said Jeff Richardson, a VantageScore spokesman. "And, VantageScore is directionally accurate and similar to other scores that will be used future lending decisions."
Bingham, however, said that's not always the case. Yet whether it's similar or not, VantageScore does come with an advantage: Consumers can often access it for free.
Checking a FICO score that a lender plans to use can mean paying for it — although lenders also are required to tell you the score they used in their decision if you are either denied a loan or credit, or are offered less favorable terms than other consumers get.
MyFico.com, where you can see all of your FICO scores, charges from about $20 to $40 monthly, depending on the level of credit monitoring you sign up for. And while FICO has partnered with some banks and lenders to share specific FICO scores with customers, another loan company might use an entirely different version in their decision-making.
For Webb, the Utah resident, the difference in scores meant that he and his wife needed to revise their plans. Instead of buying an existing home, they plan to purchase a new home — it's now under construction — that won't be ready for at least several more months. Webb has been working to improve his score so he can lock in the best interest rate possible before they go to settlement.
Soon after Webb's disappointing experience, the disparity in his scores was explained to him in a personal finance class at the University of Utah, where he's working on both a bachelor's degree in human family and community development, and a certified financial planner designation.
Bingham, the credit expert, was there as a classroom guest to explain to students the differences among credit scores.
"It was eye-opening for me," Webb said.
The class instructor, Ann House, said consumer misconception about credit scores is rampant.
"There is so much confusion surrounding this," said House, who also is the director of the university's Personal Money Management Center.
"I have pretty savvy students, but even they get confused when we talk about credit scores and credit reports, let alone when we explain the different scores we can get," House said.
For its part, Credit Karma does provide information on the differences between credit scores on its website. And in emailed comments to CNBC, a Credit Karma vice president, Dana Marineau, said it's "unlikely that a consumer will get the same credit score that his or lender is using at the time of a loan application."
"Credit Karma recommends people choose one credit score source to track to understand its status and how it trends — and should never pay for their scores," Marineau said.
Nevertheless, some experts question how helpful it is to provide a credit score if it's unlikely to be the one used the next time you apply for a loan or credit.
"If you can get your score for free but it's not accurate, what's the purpose?" Bingham said.