Credit Score Explained: How Cards Affect Your Score

A credit score is not a mystery. It is a formula. The inputs are publicly known, the weightings are published, and the outputs are predictable if you understand the mechanics. What feels opaque becomes straightforward once you see the calculation.

Here is exactly how it works and what credit cards do to each factor.

The Five Factors (FICO Model)

The most widely used scoring model — FICO — calculates your score from five factors with published weightings:

1. Payment History — 35%

The most important factor by a significant margin. Every on-time payment adds a positive mark. Every late payment (30+ days) adds a negative mark that stays on your report for seven years.

What credit cards do: if you pay your card statement on time each month, this factor works strongly in your favour. If you miss a payment at 30 days, this factor takes a significant hit that takes years to fully recover from.

Action: set up autopay for at least the minimum payment. Pay the full balance manually each month on top of that.

2. Credit Utilisation — 30%

Utilisation is the percentage of your available credit that you are using. If you have $10,000 total credit limit and a $3,000 balance, your utilisation is 30%.

What credit cards do: every card you open increases your total available credit, which lowers your utilisation ratio — a positive effect. But running high balances on cards increases your utilisation — a negative effect.

Action: keep utilisation below 30% across all cards. Below 10% is optimal. If you have a large purchase to make, pay it down before the statement closing date so it does not report as high utilisation.

3. Length of Credit History — 15%

This factor measures the average age of your accounts and the age of your oldest account. Longer history is better.

What credit cards do: your first card, opened years ago, is now your most valuable account from a history perspective. Closing old cards removes their age contribution. Opening new cards lowers the average age.

Action: do not close old cards unless they have an annual fee you cannot justify. Keep them open with a small recurring charge.

4. Credit Mix — 10%

Lenders prefer to see that you can handle different types of credit responsibly — revolving accounts (cards) and instalment accounts (loans, mortgages, car finance).

What credit cards do: they contribute the revolving credit component of your mix. If you only have credit cards and no instalment accounts, adding a small personal loan or credit-builder loan can improve this factor.

Action: do not open accounts just to improve your mix. But if you need a loan for a genuine purchase, the mix benefit is a bonus.

5. New Inquiries — 10%

Every time a lender checks your credit for an application, it creates a hard inquiry. Multiple hard inquiries in a short period signal potential credit stress.

What credit cards do: each card application creates one hard inquiry. The score impact is small (5–10 points) and temporary (fades within 12 months).

Action: do not apply for multiple cards in a short window. Space applications at least 6 months apart.

The Specific Numbers

A credit score above 750 gets you the best rates on mortgages, car loans, and premium cards. Here is a rough guide to what moves the needle:

• On-time payment every month for a year: +10 to +30 points
• Dropping utilisation from 80% to 30%: +20 to +50 points
• Dropping utilisation from 30% to under 10%: +10 to +20 additional points
• Adding a new credit account: -5 to -10 short-term, +10 to +20 over 12 months
• A 30-day late payment: -80 to -110 points

What the Nexo Card Does to Your Credit

The Nexo crypto-backed credit card operates differently from a traditional credit card. Because it is backed by collateral, it does not require a credit check — no hard inquiry. But it also may not report payment history to all three major bureaux in all markets.

If building a traditional credit score is your goal, use the Nexo card alongside (not instead of) a card that reports to the bureaux. Use Nexo for access to credit, and your traditional card for credit history building.

The Summary

Pay on time, every time. Keep balances low. Keep old accounts open. Do not apply for cards too frequently. These four rules, applied consistently, will produce an excellent credit score within 2–3 years from any starting point.