The Complete Credit Score Guide
Everything you need to know to understand, protect, and improve your credit score — with specific actions ranked by speed and impact.
Your credit score is a three-digit number that affects your mortgage rate, car loan rate, apartment approval, insurance premiums, and even some job applications. A difference of 100 points on a credit score can mean paying $50,000+ more on a 30-year mortgage. Understanding and improving yours is one of the highest-ROI financial moves you can make.
A credit score (most commonly FICO, scale of 300-850) is a statistical measure of how likely you are to repay debts on time. Lenders use it to decide whether to lend to you and at what interest rate. Higher score = better rates = tens of thousands saved over a lifetime of borrowing.
Credit Score Ranges Explained
| Score Range | Rating | Mortgage Rate Impact | What You Can Access |
|---|---|---|---|
| 800–850 | Exceptional | Lowest available rates | All products, best terms |
| 740–799 | Very Good | Near-best rates | Virtually all products |
| 670–739 | Good | Slightly above best | Most products, good terms |
| 580–669 | Fair | Significantly higher rates | Limited options, higher costs |
| 300–579 | Poor | Very high rates or denial | Secured cards, rebuilding products |
The 5 Factors That Make Up Your Score
FICO scores are calculated from five factors. Understanding each lets you know exactly which behaviors move your score:
Which Credit Score Lenders Use in 2026
You don't have one credit score. Each bureau's file can be run through a dozen or more scoring models, and the lender picks the model, not you. Five families matter most right now:
| Model | Where you'll meet it | Collections and trends |
|---|---|---|
| Classic FICO (FICO 2, 4 and 5) | Mortgages: still the default for Fannie Mae, Freddie Mac and FHA loans | Counts paid collections, and medical collections like any other; no trended data |
| FICO 8 | The most widely used FICO version, common for credit cards and personal loans | Counts collections of $100 or more, paid or not, medical included; no trended data |
| FICO 9, 10 and 10T | Some card and auto lenders; 10T is approved for Fannie Mae and Freddie Mac but not yet eligible, and FHA adds it on Jan. 1, 2027 | Ignores paid collections and gives medical ones less weight; 10T reads 24 months of trended data |
| VantageScore 3.0 | Free score apps and many card issuers | Ignores paid collections and all medical collections; no trended data |
| VantageScore 4.0 | Free apps and card issuers, any Fannie Mae or Freddie Mac lender since Sept. 9, 2026, and FHA from Jan. 1, 2027 | Ignores paid collections and all medical collections; reads 24 months of trended data |
Medical collections that are paid, or under $500, don't reach your reports at all (more below), so the medical rules above apply to unpaid bills of $500 or more.
The mortgage change
For decades, a loan sold to Fannie Mae or Freddie Mac had to be scored with Classic FICO. The Federal Housing Finance Agency approved VantageScore 4.0 as an alternative in July 2025, the two companies began a limited rollout with about 50 lenders on May 1, 2026, and on September 9, 2026 they opened it to every approved lender. The lender picks one model for the whole loan (it can't score one borrower with FICO and a co-borrower with VantageScore), and it still pulls reports from all three bureaus. FICO 10T is approved but not yet eligible for delivery. FHA-insured loans add VantageScore 4.0 and FICO 10T alongside Classic FICO for case numbers assigned from January 1, 2027.
The two scores aren't priced the same. Fannie Mae and Freddie Mac's price grids ask for a VantageScore 4.0 about 20 points higher than a Classic FICO score for the same price: the best tier starts at 780 on Classic FICO and at 800 on VantageScore 4.0. In a Milliman comparison reported by HousingWire, Classic FICO produced the cheaper price adjustment about 40% of the time and VantageScore 4.0 about 25% of the time; the rest tied.
Fannie Mae also removed its hard 620 minimum for loans run through its Desktop Underwriter system on November 16, 2025, and now weighs the whole file instead of a cutoff. Many lenders still set 620 as their own floor, and mortgage insurers can set their own minimums.
What to do: ask your loan officer which model they'll use before they pull credit. A paid non-medical collection still counts against you on Classic FICO but not on VantageScore 4.0, and VantageScore can score files too thin for Classic FICO. You can't choose the model, but you can shop lenders.
What Changed: Trended Data, BNPL and Medical Debt
Trended data: 24 months instead of one snapshot
Classic FICO and FICO 8 read your card balances as a snapshot: whatever each issuer reported last. FICO 10T and VantageScore 4.0 also read the trend. For each card they can see up to 24 months of balances, the minimum due and what you actually paid, so they can tell someone who pays in full every month from someone who carries a balance, and a balance that is shrinking from one that is growing. Fannie Mae's underwriting system has used trended data since 2016.
A payoff the week before you apply still lifts a snapshot score. A trended score also sees the 23 months before it, so if a mortgage is on the horizon, start paying balances down three to six months ahead and pay more than the minimum each month. The credit utilization guide walks through an example.
Buy now, pay later loans
Pay-in-4 plans used to be invisible to credit reports. Affirm began reporting all of its loans, including Pay in 4, to Experian for plans started from April 1, 2025, and in June 2025 FICO introduced FICO Score 10 BNPL and 10T BNPL, versions that count these loans. Most scores in use today don't count BNPL loans, so on-time plans may not help much yet. A plan you stop paying can still go to collections, which hurts every score. More in our buy now, pay later guide.
Medical collections
Three voluntary bureau policies keep most medical debt off reports: paid medical collections are deleted (since July 2022), new medical collections don't appear until a year has passed, and medical collections under $500 aren't reported at all (since April 2023). A CFPB rule that would have removed medical bills from credit reports entirely was finalized in January 2025 but vacated by a federal court in Texas on July 11, 2025, so an unpaid medical collection of $500 or more can still show up.
Roughly 15 states have passed laws that go further. In October 2025 the CFPB issued an interpretive rule saying federal law overrides state rules on what a credit report can contain; it doesn't bind courts, but it has put those state laws in doubt. The model matters too: VantageScore 3.0 and 4.0 ignore medical collections, FICO 9 and 10 give them less weight, and FICO 8 and Classic FICO count them like any other collection.
How to Raise Your Credit Score — Fastest to Slowest
Immediate Impact (0–30 Days)
- Pay down credit card balances — utilization is reported monthly. Paying a card from 80% to under 10% can add 50–100+ points within one billing cycle
- Dispute errors on your credit report — 1 in 5 Americans has errors on their credit report. Get your free reports at AnnualCreditReport.com and dispute any inaccuracies directly with each bureau online
- Request a credit limit increase — if your income has increased, call your card issuer and request a higher limit. More available credit = lower utilization = higher score (as long as you don't increase spending)
Short-Term Impact (1–6 Months)
- Become an authorized user — ask a family member with excellent credit to add you as an authorized user on their oldest card. Their history appears on your report. You don't need to actually use the card.
- Set up autopay for all minimum payments — never miss another payment. One 30-day late payment can be catastrophic to a good score.
- Pay off collections — FICO 9, FICO 10 and VantageScore 3.0 and 4.0 ignore paid collections, and the bureaus delete a medical collection once it's paid. FICO 8 and the Classic FICO scores most mortgage lenders use keep counting a paid non-medical collection until it ages off after 7 years.
Long-Term Improvement (6 Months–2 Years)
- Keep old accounts open — age is 15% of your score. Closing a 10-year-old card hurts.
- Build positive payment history consistently — every on-time payment is a data point in your favor
- Apply for credit sparingly — only apply for new credit when genuinely needed
Legitimate negative information cannot be legally removed from your credit report before 7 years (10 for bankruptcy), regardless of what "credit repair" companies promise. They charge $50–150/month to do things you can do yourself for free. Save the money and direct it to debt payoff instead.
Understanding Your Credit Report
Your credit score is calculated from data in your credit report. You have three reports, one from each bureau (Experian, Equifax and TransUnion), and you can get all three free every week at AnnualCreditReport.com; the bureaus made the weekly schedule permanent in September 2023. They often differ slightly, because not every creditor reports to all three. Our line-by-line credit report guide explains each section.
What to look for when reviewing:
- Accounts you don't recognize (potential fraud or identity theft)
- Incorrect late payments (dispute any that are wrong — in writing, with documentation)
- Accounts listed as open that you've closed
- Incorrect balances or credit limits
- Hard inquiries you didn't authorize
- Buy now, pay later loans you don't recognize, or late marks on a plan you paid on time
Building Credit From Zero
If you have no credit history, you're invisible to lenders — which is almost as problematic as having bad credit. Here's the fastest path from zero to 700+:
Before a loan application, the Credit Utilization Optimizer times card payments to each statement closing date so the balances your cards report are as low as your cash allows.