• Pay in full every month. Every other rule is a detail.
• Cashback > travel rewards for wealth building
• 22% APR on $5,000 costs ~$2,500+ in interest over 4 years
• Keep utilization below 10% of total credit limit for optimal FICO

The median American is losing $1,400/year to credit card interest

The median US household carries about $6,500 in credit card debt^[1] at an average APR above 22%^[2]. That's ~$1,430 per year evaporating in interest alone — not paying down principal, not building anything, just rent on money you already spent.

Invest that same $1,430/year at 10% from age 25, and you retire with an extra $700,000+ by 65. The credit card balance is not a small thing.

The one rule: pay in full every month

If you cannot pay the statement balance in full on the due date, stop using the card. Cut it up. Close it when you're debt-free if the temptation is real. No other rule matters until this one is automatic.

Set autopay to "statement balance" (not minimum, not fixed amount). The minimum payment is designed to keep you in debt for the rest of your life — a $5,000 balance at 22% with minimum payments takes 17 years and ~$6,200 in interest to pay off.

Cashback vs travel rewards

For someone building long-term wealth, cashback wins. Travel rewards are fun but require active gaming: optimizing transfer partners, chasing signup bonuses, managing multiple cards, redeeming at the right time. A single bad redemption can halve your effective return.

Cashback is boring and predictable. 2% back on $30,000 of annual spending is $600 a year, delivered as cash you can invest. No travel planning, no point valuation spreadsheets, no blackout dates.

Cards worth considering for a Bitcoin-focused person

• Fidelity Visa. 2% flat cashback, deposited directly into your Fidelity brokerage account. Use it to buy VTI, FSKAX, or IBIT automatically. No annual fee. The simplest wealth-compounding card on the market.
• Gemini Credit Card. 3% back on dining, 2% on groceries, 1% everywhere else — paid in Bitcoin at the moment of the transaction. No annual fee. Good for someone already Bitcoin-aligned.
• Citi Double Cash or Wells Fargo Active Cash. Flat 2% on everything. No annual fee. Simpler than Fidelity if you don't have a Fidelity account.

Skip the complicated 5% rotating-category cards unless you genuinely enjoy calendar-tracking. The marginal return (1–2% more on specific categories) rarely beats the cognitive cost.

What happens when you carry a balance

Credit utilization and FICO score

Your credit score includes utilization (how much of your available credit you're using) as 30% of the calculation. Keep it below 10% for optimal scoring — not 30%, which is the myth. A $500 balance on a card with a $1,000 limit (50% utilization) dings your score even if you pay in full. A $500 balance on a card with a $10,000 limit (5%) does not. See the full credit score guide for the rest of the math.

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