Is a second credit card a good idea?

A second credit card is a good idea when it does a job your first card cannot do and you already pay your first card in full and on time. The credit score effect is small and usually positive, because the new limit lowers your utilization. It is a bad idea when the only attraction is a bonus you would have to stretch for, or when one due date is already hard to keep.

What opening a second card does to your score

Three things change, and they pull in different directions.

The application adds a hard inquiry. It stays on your report for two years, but FICO only counts it for 12 months, and a single inquiry is a minor factor for most people.

The new account lowers the average age of your accounts. With one card opened four years ago, your average age is four years; add a new card and it drops to two. Length of history is 15% of a FICO score by FICO’s own weighting, so this is real but slow to matter, and it fades as both accounts age.

The new limit lowers your utilization, the share of your available revolving credit that you are using. If you carry $1,500 on a single card with a $5,000 limit, your utilization is 30%. A second card with another $5,000 limit cuts that to 15%, as long as the balance does not grow with the limit. Amounts owed make up 30% of a FICO score, which is why this effect usually outweighs the other two. There is no magic threshold here; lower is better, and the people with the highest scores tend to sit in the single digits.

One more condition: a file needs at least one account open six months or more for FICO to calculate a score at all, according to FICO’s minimum scoring criteria. If your first card is newer than that, let it age before adding a second.

Jobs a second card can do that the first cannot

Name the job before you look at offers. If you cannot, you do not need the card.

• Better rewards on how you actually spend. If your first card was a starter card with no rewards, a flat cash back card is the obvious upgrade, provided you pay in full every month. Interest on a carried balance costs far more than any reward rate, as the cash back vs. points comparison shows.
• No foreign transaction fee. Many cards add a fee to every purchase made abroad or in a foreign currency. If you travel, a second card without it pays for itself on the first trip. See how foreign transaction fees work.
• Getting out of debt. A balance transfer card with a 0% intro period can cut the interest on an existing balance, but the transfer fee and the deadline decide whether it saves money. Run the numbers in our balance transfer math first.
• A backup on a different network. If your only card is an American Express, a Visa or Mastercard covers merchants abroad that do not take it. A backup also keeps you paying when one card is frozen after a fraud alert.

The weak reason: a bonus you have to stretch for

A bonus is worth chasing only when your normal spending already meets the requirement. Our piece on what a sign-up bonus really costs works through three scenarios with the numbers.

When a limit increase does the job instead

If your only goal is lower utilization, asking your current issuer for a higher limit gets the same effect with no new account and no drop in average age. Some issuers review requests with a soft inquiry; ask before you submit. The steps are in how to get a higher limit without a hard inquiry. Choose the new card when you need a capability, not just more room.

A common pairing

The pairing people most often land on is one flat-rate cash back card for everything and one travel card whose points transfer to airline and hotel programs. Citi Double Cash pays 2% cash back with no annual fee, and the Chase Sapphire Preferred is an example of a transferable-points card; the table pulls their structural terms from our maintained catalog.

The pairing only makes sense if you travel enough to use transfers and the travel card’s annual fee passes the annual fee break-even. If you do not, two no-fee cards on different networks cover most people’s needs.

Running two cards without a slip

The risk of a second card is less about the score effects above and more about a missed payment. A payment 30 days late can be reported to the bureaus and stay on your report for seven years. Before you apply, check these:

1. Your first account has no late payments and has been open long enough to have a score, six months at minimum.
2. You paid the full statement balance on your first card for the last several months. If you carry a balance, a rewards card is the wrong second card; a 0% transfer or a payoff plan comes first.
3. You can name the job the new card will do, in one sentence.
4. Autopay is ready on both cards for at least the minimum, with a reminder to pay the full balance. Many issuers let you move the due date, so both cards can be due the same week.
5. You do not plan a mortgage or auto loan application in the next few months, when a fresh inquiry and a new account would be at their most visible.

Once you have two cards, keep the older one open even if you stop using it much. Closing it removes its limit, which raises your utilization; a closed account in good standing can stay on your report for up to 10 years, so the history itself does not vanish right away. The tradeoffs are covered in closing your oldest card.