You’re Already In the Credit Card Game. Don't Let It Play You.

Like it or not, you are already in and likely losing at the credit card game. Every time you buy groceries, a coffee, or a bus ticket, the price you pay quietly bakes in card interchange fees. Call it a “2% life tax.” If you pay with debit or cash, you still pay that 2% inside the sticker price. That means you are subsidizing someone else's cash back, free flights and banks' bottom line. I believe society would be better off with Europe-style caps on card interchange fees (1). Until that happens, "if you can't beat them, join them," so we play it smart.

Why even the average credit card user loses

Most people use a 1% cash-back card. If prices are inflated by 2%, 1% back means you still lose about 1%. That's before late fees or interest. The win requires strategy.

Math you can feel

Inflation effect: A $100 grocery run priced with a 2% fee would have cost $98.04 in a no-fee world.

• Pay with no rewards: you effectively pay $100 for $98.04 value → −2%.
• Pay with 1% back: $100 − $1 = $99 for $98.04 value → −1%.
• Pay with 5% back category: $100 − $5 = $95 for $98.04 value → +3.2%. You finally win.
• Pay with 5x points category and redeem for 2 cents per point: $100 − $10 = $90 for $98.04 value → +8.9%. Now we are talking.

Interest nukes rewards: A 24% APR means carrying a $100 balance for 30 days costs about $2 in interest, and it compounds over time. That quickly wipes out most rewards. If you pay any interest, you are losing the game.

The RGS Playbook

1) Pay on time, every time

• Turn on Autopay for the full statement balance from day one.
• Add calendar reminders for statement close and due dates.
• Keep a small emergency buffer in checking. Interest and late fees delete your progress.

Let me repeat: if you pay interest, you are losing. Full stop.

2) Only spend what you already have

• Treat the card like a safer debit card with protections.
• Pre-commit a monthly spending cap that fits your stipend.

3) Start with simple, high-value categories

• Practice with small credit limits like with student credit cards (Discover student)
• Focus on no annual fee cards with bonus categories you actually use: groceries (Citi Custom Cash), dining (Chase Freedom Unlimited), or gas (Amex Blue Cash).
• Use one card per category to avoid mistakes. Winning is consistency.

4) Credit hygiene

• Keep utilization low. Aim under 20% of your limit by paying mid-cycle if needed (2).
• Keep your oldest cards open to preserve credit history (2).
• Avoid unnecessary hard pulls (2).

5) Go for that sign-up bonus

Sign-up bonuses are the fastest way to stack points or cash back. Once you have a few everyday cards and a few months of on-time payments that build your credit history, start targeting elevated welcome offers. Apply when the bonus is high, hit the minimum spend with expenses you already planned, and then decide if the card still earns its place.

RGS tips: Never overspend to reach a bonus. If the math doesn't work, skip it. After the first year, downgrade to a no-fee version if the card no longer fits. Closing can reduce your average age of accounts and total credit line.

6) Pay for expenses that you get reimbursed

Going out with friends? Offer to pay the bill and have everyone reimburse you on the spot. Headed to a conference? Put flights, hotels, and registration on your card if your university or PI allows it, then submit receipts quickly. The rewards become a free bonus for you.

Ground rules:

• Only float what you can cover without paying interest. If reimbursement is slow, skip it.
• Get reimbursed immediately for group dinners. Use instant transfer apps and confirm the total before you pay.

7) Despise co-branded credit cards

Sadly, many people's first credit card is a co-branded store credit card (3). Ever been pressured at Macy's to open their store card? When using a co-branded credit card, the interchange-fee pie is split between the bank and the retailer before any rewards reach you. You are definitely getting a worse deal. There are a couple of exceptions to this rule, which we discuss in this article.

International Corner

• No SSN yet? Some banks allow applications with an ITIN. Start with a student card (e.g. Discover Student or Chase Freedom Rise) to build your credit history (4).
• Choose no foreign transaction fee cards (e.g. Chase Sapphire Preferred) if you still pay for home-country services.

How to actually profit

• Autopay in full.
• Stack categories: groceries at 5% beats a flat 1%.
• Redeem smart: high-value travel redemptions.
• Never carry a balance. If life happens, pause the game.
• Track it: a simple spreadsheet with columns for category, rate, statement close date, and due date.

Bottom line

Across the economy, we collectively pay hundreds of billions each year (5) for the card system, partly in higher prices and partly in direct interest and fees. Most consumers do not come out ahead. People who never pay interest and redeem points at high value can offset their share and then some. Everyone else helps fund the system. You need the right cards, plus perfect payment behavior.

References

(1) https://ec.europa.eu/commission/presscorner/detail/hr/ip_15_4585

(2) https://www.experian.com/blogs/ask-experian/credit-education/score-basics/what-affects-your-credit-scores/

(3) https://www.prnewswire.com/news-releases/co-branded-credit-card-trends-continue-but-with-twists-according-to-packaged-facts-301345355.html

(4) https://www.americanexpress.com/en-us/credit-cards/credit-intel/credit-card-without-ssn/

(5) https://nilsonreport.com/articles/merchant-processing-fees-in-the-united-states-2023/.