Your credit score doesn't just determine whether you get approved. It determines how much every loan you take out will cost you. On a large loan over a long term, that difference can be substantial.
A credit score is a numerical summary of your credit history, calculated by credit bureaus using models developed by companies like FICO and VantageScore. The most widely used version is the FICO score, which ranges from 300 to 850. Lenders use it as a quick measure of how likely you are to repay a debt as agreed.
The score is built from five main factors. Payment history is the largest, accounting for about 35% of the score. Whether you've paid bills on time, and how late any missed payments were, matters more than anything else. Credit utilization is next at around 30%, measuring how much of your available revolving credit you're currently using. Lower utilization is better. Length of credit history, mix of credit types, and recent inquiries make up the rest.
Lenders use score ranges to tier their rates. The exact cutoffs vary by lender and loan type, but the general structure is consistent. Borrowers above 760 typically get the best available rates. Between 700 and 760 is still solid but rates tick up slightly. Below 680 and rates rise more noticeably. Below 620 and some lenders won't approve the loan at all, and those that do charge significantly higher rates.
On a $300,000 mortgage over 30 years, the rate difference between a top-tier score and a mid-range score can be 0.5% to 1% or more. That translates to tens of thousands of dollars in additional interest over the life of the loan. Use the Calculon mortgage calculator to see exactly how much a rate difference costs you at your loan amount.
Payment history is the most important factor and the slowest to repair. A missed payment stays on your credit report for seven years, though its impact fades over time, especially as you build a record of on-time payments afterward. Paying on time, every time, is the single most impactful habit.
Utilization is the fastest lever. If you're carrying a high balance relative to your credit limit, paying it down will improve your score relatively quickly. Keeping utilization below 30% is the common guideline. Below 10% is better if you're optimizing before a major loan application.
Opening multiple new accounts in a short period can temporarily lower your score due to hard inquiries and the reduction in average account age. If you're planning a major loan application within the next several months, that's not the time to open new cards or take on new credit.
You're entitled to a free credit report from each of the three major bureaus annually through AnnualCreditReport.com. Review it before applying for any significant loan. Errors on credit reports are not uncommon, and disputing an error that's dragging down your score can be worth doing if time allows.
Many banks and credit cards now offer free FICO score access as a feature. Checking your own score is a soft inquiry and has no impact on the score itself.
A higher credit score means lower rates, which means lower total cost on every loan. The improvements that matter most are also the most straightforward: pay on time and keep balances low. If a major purchase is on the horizon, checking your score early and addressing any issues gives you time to improve it before the rate is set.
Further reading coming soon.