A credit score is a three-digit number that quietly shapes some of the biggest financial decisions in your life — the mortgage rate you qualify for, whether an auto lender approves your application, and even whether some landlords and employers will consider you. Despite how much rides on it, most people have only a rough sense of how the number is actually calculated, and the confusion is understandable: there are multiple competing scoring companies, multiple versions of each company's model, and a credit report full of raw data that gets interpreted differently depending on which lender and which product is asking. This guide breaks down exactly how FICO and VantageScore — the two dominant scoring models in 2026 — work, what changes between their versions, how long different types of negative information actually stick around, and how to read your score the way a lender does rather than the way a free app happens to display it.
FICO vs. VantageScore: the two models that matter
Nearly every consumer credit score used in the US today comes from one of two competing systems: FICO, developed by the Fair Isaac Corporation, and VantageScore, a competing model jointly developed by the three major credit bureaus — Equifax, Experian, and TransUnion. Both scores run on the same familiar 300–850 scale, both are calculated from the same underlying credit report data, and both are trying to predict the same thing: the likelihood you will fall seriously delinquent (typically 90+ days late) on a debt within the next 24 months. Where they differ is in exactly how they weight and interpret that underlying data, which is why it is common to have a FICO score and a VantageScore that differ by 20 points or more even when pulled on the same day from the same credit report, and why quoting "your credit score" as a single fixed number is technically imprecise even though it is how most people talk about it in everyday conversation.
FICO remains the dominant model for mortgage lending specifically — Fannie Mae and Freddie Mac guidelines have historically required FICO scores for most conventional mortgage underwriting, and FICO reports its scores are used in the vast majority of lending decisions across all credit types. VantageScore has gained significant ground in credit card and personal loan underwriting, and free credit-monitoring apps overwhelmingly display VantageScore rather than FICO, since VantageScore's data licensing terms make it more accessible for that use case. This is one of the most common sources of confusion: the score displayed for free in a banking app is very often not the same score a mortgage lender will actually pull.
What each factor is worth: FICO's weighting
FICO has published its general weighting methodology for years, and while the exact algorithm is proprietary, the broad categories and their approximate weights are well established.
| Factor | Weight | What it measures |
|---|---|---|
| Payment history | 35% | Whether you have paid every account on time, and how recently and severely any late payments occurred |
| Amounts owed (utilization) | 30% | How much of your available credit you are using, both per-card and in total |
| Length of credit history | 15% | The age of your oldest account, your newest account, and the average age across all accounts |
| Credit mix | 10% | Whether you have experience managing different account types — credit cards, installment loans, mortgages |
| New credit | 10% | How many accounts and hard inquiries you have opened or triggered recently |
Payment history and utilization together account for nearly two-thirds of your score, which is why the two most impactful actions almost anyone can take are paying every bill on time and keeping credit card balances low relative to their limits. VantageScore uses a broadly similar set of categories but weights them somewhat differently, placing more relative emphasis on total balances and the depth of credit history, and less on the precise mix of account types.
Both scores are calculated only from your credit report data — income, savings, employment status, rent payments (unless specifically reported), and utility payments (unless specifically reported through certain newer reporting programs) do not factor into either score directly, even though lenders may separately ask for that information during underwriting, and may weigh it heavily in their own final approval decision even when it has no effect on the score itself.
Score ranges: what counts as good, in 2026
Both FICO and VantageScore use the same 300–850 scale, and the general tier boundaries are broadly similar, though lenders set their own cutoffs for specific products rather than following a single universal standard.
| Score range | General tier | Typical lending impact |
|---|---|---|
| 800–850 | Exceptional | Best available rates on virtually every product |
| 740–799 | Very good | Qualifies for most prime rates with minimal pricing penalty |
| 670–739 | Good | Standard approval for most products; rate is noticeably higher than top tier |
| 580–669 | Fair | Approval possible but with higher rates, larger down payments, or added conditions |
| Below 580 | Poor | Approval difficult for unsecured credit; secured or subprime products may be the only options |
It is worth emphasizing that these tiers are general industry convention, not a rule enforced by the scoring companies themselves. A mortgage lender's cutoff for its best pricing tier, for example, is often specifically 740 or 760 rather than the round 740 boundary shown above, and auto lenders frequently have entirely different tier structures optimized for auto-loan default risk specifically.
FICO score versions: why "your FICO score" isn't one number
A detail that surprises many people: there is no single FICO score. FICO has released multiple generations of its base scoring model (FICO 8 remains the most widely used across industries, with FICO 9 and FICO 10 in more limited but growing use), plus industry-specific versions tailored to particular lending decisions, such as FICO Auto Scores and FICO Bankcard Scores, which reweight the same underlying data to better predict default risk for that specific product type. Mortgage lenders in 2026 commonly still pull older FICO versions (FICO 2, 4, or 5, depending on the bureau) because of how mortgage-industry underwriting guidelines have historically been written, even though newer FICO versions are available and used elsewhere. This is why a score you see in a free app can differ meaningfully from the score an actual mortgage lender pulls for your application — they may literally be different scoring models applied to the same credit report, sometimes by 30 points or more, which is a common source of frustration for borrowers who feel blindsided by a mortgage-specific score they had never seen before applying.
Curious how your credit profile affects the interest rate on a specific loan? Model the difference across score tiers with our Mortgage Calculator or Auto Loan Calculator.
What isn't in your credit score
A few common misconceptions are worth clearing up directly. Your income and employer are not part of either scoring model, though lenders typically verify both separately during underwriting. Your age, marital status, and where you live are excluded by law from credit scoring models under the Equal Credit Opportunity Act. Checking your own credit report or score, known as a soft inquiry, never affects your score, regardless of how often you check — only hard inquiries triggered by an actual credit application have any scoring impact, and even then the effect is typically small and temporary.
How newer scoring models are changing the picture
Both FICO and VantageScore have introduced newer model versions (FICO 10 and VantageScore 4.0, among others) that incorporate trended data — meaning the model looks at how your balances have moved over the past 24 months rather than just a single snapshot, rewarding a consistent pattern of paying down balances over time even if your current balance is not at zero. VantageScore's models have also moved toward scoring more people who have thin or no traditional credit files by incorporating alternative data sources, such as rent and utility payment history, where lenders have opted into reporting that information. Adoption of these newer models across the lending industry has been gradual, and as of 2026 many lenders, particularly in mortgage underwriting, still rely on older model versions specified by investor guidelines rather than the newest available scoring technology.
How long negative information stays on your credit report
Understanding how long different types of negative information remain visible helps explain why a score can take years to fully recover from a serious setback, even after the underlying account is resolved. Late payments generally remain on a credit report for seven years from the date of the missed payment, regardless of whether the account is later brought current or paid off. Collections accounts also remain for seven years from the original delinquency date on the account that led to the collection, not from the date the collection agency acquired the debt — a detail that matters because it prevents a debt from being "re-aged" and reported as new simply because it changed hands. Chapter 7 bankruptcy remains on a credit report for up to 10 years from the filing date, while Chapter 13 bankruptcy, which involves a repayment plan, typically falls off after 7 years. Hard inquiries have a much shorter shelf life, generally dropping off after 2 years, and most scoring models stop counting their impact well before that, often within the first 12 months.
Positive information generally has no expiration date as long as an account remains open and in good standing, which is one reason a single old account kept open and unused can still meaningfully help the length-of-credit-history factor even years after you last actively used it. This is also why closing an old, no-fee credit card is often discouraged even if you no longer use it regularly — once closed, the account eventually stops counting toward your average account age on some scoring models, quietly working against the very factor it had been helping.
How collections and medical debt are treated differently in 2026
Both major credit bureaus and both scoring models have made specific changes in recent years around how certain types of debt are handled, and these changes matter enough to call out directly. Paid collections accounts are now excluded from both FICO 9/10 and VantageScore 3.0/4.0 score calculations entirely, a change from older model versions that continued to weigh a collection even after it was paid off. Medical collections specifically receive extra protections under changes adopted by the three major credit bureaus: medical collections under a certain dollar threshold are no longer reported at all in many cases, and there is typically a one-year waiting period before any medical collection appears on a report, giving insurance and billing disputes time to resolve before the debt affects your score. These changes do not apply retroactively to every older scoring model still in use by some lenders, which is another reason the same credit file can produce noticeably different scores depending on exactly which model and version a lender chooses to pull.
Credit-builder tools and how they interact with scoring
A growing category of financial products is designed specifically to help people build or rebuild credit history where none previously existed, or where past problems need to be offset with a longer track record of positive activity. Secured credit cards, which require a cash deposit that typically becomes the credit limit, report to the credit bureaus exactly like unsecured cards and can build payment history and utilization data over time. Credit-builder loans work in the reverse order of a typical loan: the lender holds the loan amount in a locked account while you make monthly payments, and you receive the funds (plus any interest earned) only after the loan term ends, with each payment reported to the credit bureaus along the way. Becoming an authorized user on a family member's older, well-maintained credit card account can also add that account's age and payment history to your own credit file, though the effect on scoring depends on the specific scoring model and how the card issuer reports authorized-user activity. None of these tools is a shortcut around the fundamentals covered above — they all work by generating the same payment-history and utilization data that any scoring model rewards, just for someone who does not yet have enough of that data on their own. It is also worth noting that most credit-builder products only help if the underlying account reports to all three major bureaus; some smaller secured card issuers and credit-builder loan providers report to only one or two, which limits how much the product can move a score calculated from the bureau that is not receiving the data.
Credit scoring outside the US
Readers comparing notes with contacts in the UK or Europe should know that credit scoring works quite differently outside the US system described in this guide. The UK does not have a single national credit score; instead, three main credit reference agencies (Experian, Equifax, and TransUnion UK) each calculate their own proprietary scores using different scales and different underlying data weightings, and lenders in the UK often rely on their own internal risk models built from bureau data rather than a single universal score in the way FICO dominates US mortgage lending specifically. Many European countries have historically relied even less on a single consumer credit score, instead using a mix of registry-based negative reporting (recording only defaults and serious delinquencies rather than a continuous positive credit history) and lender-specific underwriting models. This means advice calibrated to the US FICO and VantageScore system, including much of the utilization and account-age guidance covered elsewhere in this guide, does not translate directly to a UK or EU context, where the specific reporting agency and its own methodology matter more than a single universal number. Readers who have moved between countries should also be aware that credit history generally does not transfer across borders at all — a strong US credit file provides no direct benefit when applying for credit in the UK or elsewhere, and vice versa, since each country's bureaus maintain entirely separate records with no automatic data sharing between them.
A realistic view of how fast a score can change
Because payment history and utilization respond at different speeds, it helps to set realistic expectations for how quickly a score actually moves. Utilization-driven changes can appear within a single reporting cycle — typically 30 to 45 days — once a lower balance is reported to the bureaus, making it one of the fastest levers available for someone who needs a quick improvement before a specific application. Payment-history damage from a single missed payment, by contrast, generally has its largest negative impact in the first year or two after the incident and gradually fades over the following several years as more recent on-time payments accumulate, even though the missed payment itself remains visible on the report for the full seven years. Length-of-history and credit-mix factors move the slowest of all, since they depend on the simple passage of time and the types of accounts already open, and no single action can meaningfully accelerate them beyond opening new accounts responsibly and keeping old ones in good standing. Understanding this speed hierarchy is genuinely useful in practice: someone preparing for a mortgage application a few months out can realistically move the needle by paying down card balances before the lender pulls a score, while someone recovering from a bankruptcy or a string of missed payments needs to plan on a multi-year timeline and should focus on building a long, clean track record rather than searching for a quick fix that scoring mechanics simply do not allow.