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Credit score in the United States: how it works and how to build it from zero, whether you live here or in Brazil

The American credit score decides interest rates, down payments and even approval. The agents explain the 10%-to-30% utilization rule, why spending too little also hurts, and the mistake that can sink a purchase in the final stretch.

Episode 6 • Part 2 of 10
Score de crédito nos Estados Unidos: como funciona e como construir do zero, morando aqui ou no Brasil
Credit card and financial planning on the table (illustrative image)

Right after explaining that immigrants can buy property, the episode's conversation turns to the subject that runs through the entire home-buying process in the United States: credit score. The comparison used on the show is almost brutal in its simplicity — asked whether the score matters, the answer came as another question: "do you think it's important to drink water?"

"In the United States, you don't get anywhere without a good score." — from the episode

Newcomers from Brazil don't have a bad score: they have no score at all

It's an important distinction, and the episode is careful to separate the two situations. Someone arriving from Brazil shows up with no history — what the industry calls a thin file, or a credit-invisible consumer. That's not the same as having a low score because of missed payments. For the lender, it's the lack of information that's the obstacle, and the way out is to start generating that information.

The paths mentioned on the show, and the usual ones in the market:

  • A card with a small limit — one of the agents says he started with a card with a $500 limit and built from there.
  • A secured card, where the client deposits the amount that becomes the limit — common for anyone without a history yet.
  • A U.S. bank account, which helps start the relationship and prove activity.

On opening an account from Brazil, the episode offers a practical, up-to-date note: it's gotten stricter. Many banks now require a U.S. address, and opening an account in person tends to be more flexible than doing it remotely — a reflection of tighter anti-money-laundering rules. International banks and Brazilian institutions with U.S. operations come up as an alternative.

The 10% rule (and the 30% ceiling)

The most practical point in the segment is credit utilization — the ratio between what you've charged and your available limit. The guidance given on the episode is the same that circulates among lenders: staying under 10% is excellent; above 30% starts to hurt the score.

In practice: a card with a $500 limit means keeping spending close to $50 a month — and paying the statement in full.

Spending too little doesn't help either

Here's the counterintuitive part, and the episode drives it home. Someone who caps the card at $100 a month and never goes beyond that builds no reputation at all: the lender needs to see activity paid on time. The image used on the show is stretching a rubber band — spending a little more each month and paying off the full balance, repeatedly, until the limit gets raised.

It's that behavior — consistent use, always paid in full — that raises the score. Paying only the minimum keeps the account current, but leaves a balance rolling over, which raises utilization and racks up high interest on top of it.

What else weighs on the score

  • On-time payment — the heaviest-weighted factor in score models.
  • Credit utilization — that 10%-to-30% ratio.
  • Length of credit history — which is why closing your oldest card is usually a bad idea.
  • Recent inquiries and opening several accounts in a row drag the score down in the short term.

The classic mistake: buying a car after pre-approval

The segment closes with the warning that costs unsuspecting buyers the most money. Someone who gets the pre-qualification letter thinks the financial part is settled and goes on a spree — car, furniture, appliances, all financed. The episode is categorical: the underwriting gets redone before closing.

"People don't know that it's checked at the start and checked at the end. If something changed, you can get shut out at the last minute." — from the episode

The loan funds are only actually disbursed in the transaction's final days. New debt increases your income commitments, changes the debt-to-income ratio the lender calculated, and can derail approval right at the end of the process. The practical rule: between pre-approval and getting the keys, don't open new credit, don't finance anything, and don't change jobs without telling your lender.

How to track your score

Under federal law, consumers have the right to a free credit report from all three bureaus (Equifax, Experian and TransUnion) through the official channel, AnnualCreditReport.com. It's worth checking for errors — an account that isn't yours, a payment wrongly marked late — since disputing incorrect information is one of the fastest ways to fix your score.

Sources and verification

  • Consumer Financial Protection Bureau — guidance on credit utilization, score factors and credit-invisible consumers.
  • Fair Credit Reporting Act / AnnualCreditReport.com — right to a free credit report from all three bureaus.
  • FICO and VantageScore — composition of score models (payment history, utilization, account age, inquiries).
  • The 10% and 30% figures, the $500-card example and the warning about purchases after pre-qualification: the agents' account on the episode (March 2026).
  • Transcript of episode 6 of the Cadê Moradia podcast.

Watch this part of the episode:

The importance of the credit score (approximate excerpt) — starting at 2:33 · CADÊ BRAZIL

Sources & editorial note

This article is a reference edition of episode 6 of the podcast and is subject to edits and editorial additions. For the full conversation, watch the episode. — Updated on 18/09/2026.

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