You can keep an unused credit card from being closed for inactivity, indefinitely, on one $1 charge a month. The issuer's review doesn't care about volume — it cares about presence. Any posted transaction inside the review window qualifies. The smallest possible charge does exactly the same job as the largest.

The short answer

$1 a month is enough to keep any unused card alive. Issuers track the date of the most recent posted transaction, not the amount. Three ways to run the cadence: manual mini-purchases, a subscription anchor, or an automation service.

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Why the smallest charge works

An issuer's inactivity-review query asks one thing: when did this account last have a posted transaction? It returns a date. The date is compared to the issuer's threshold. If the date is more recent, the account passes. Otherwise the closure flag goes up.

The query doesn't ask about transaction size, merchant category, or transaction count. So a $1 charge in month 11 saves a card whose threshold is 12 months, exactly as well as a $1,000 charge would. Both produce the same row in the database — same account, same posted-date column — and both reset the inactivity clock to zero.

This isn't a loophole; it's how the system is designed. Issuers know customers exploit it. They've left it that way because it works for them too — a customer who keeps a card alive for $1/month is still a customer, the credit line stays useful for a future purchase, and the operational cost of an active no-balance card is barely above zero.

Run the mini-charge strategy without lifting a finger. ActiveCred runs a tiny authorized charge on every linked card on a schedule. Plans: $0.99/mo (1 card) up to $4.99/mo (20 cards), plus ~$0.50 per card per month in posted activity.
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Method 1: Manual mini-charges

The cheapest way to run the strategy: one tiny purchase per month, by hand, on each unused card.

What works as a $1–$5 charge:

  • A song on iTunes or Apple Music ($0.99–$1.29)
  • A digital newspaper article unlock ($1–$5)
  • A small in-app purchase
  • A coffee at a $1-minimum cafe
  • A transit fare or parking-meter top-up
  • A vending-machine purchase if your local one accepts cards

What doesn't: tipping (no underlying transaction), some donations (process as gifts, not purchases), cash advances (post but come with fees and immediate interest — bad fit).

Workflow: rotate through cards, one per week, make a tiny purchase, pay it off. Total time per card: ~3 minutes per month. Annual spend per card: $12–$60.

Failure mode: forgetting. Most people drop the rotation within 6 months — a busy week, vacation, project deadline. Miss long enough and the cards drift toward closure.

Method 2: Subscription anchor

Same effect, higher reliability: put a real recurring subscription on each unused card and turn on autopay. The subscription bills monthly, the charge posts, autopay clears the balance, the card stays active forever.

Use subscriptions you'd be paying for anyway. The card becomes the rail; the subscription is the anchor. Apple Music, Spotify, iCloud, Google One, NYT, WSJ, Notion, 1Password, Netflix split across cards.

Marginal cost: $0/mo (you already wanted these). Reliability: high, as long as the subscription isn't canceled or repriced. Maintenance: update card-on-file when a card expires, which the issuer's tokenization usually handles automatically.

Limit: for 5+ unused cards, you start needing 5+ subscriptions. If you're not already a heavy subscription user, you end up paying for things just to keep cards alive — at which point an automation tool is cheaper.

Method 3: Automation

For multiple unused cards or zero tolerance for cognitive overhead: services that run the mini-charge strategy automatically. ActiveCred runs a small authorized charge (~$0.50 plus tax) on each linked card on a schedule.

The economics:

  • Subscription: $0.99/mo (1 card) up to $4.99/mo (20 cards)
  • Plus the activity charge per card: ~$0.50 + tax, posted on each linked card

For a 5-card portfolio: about $3/mo in subscription fees plus $2.50/mo across 5 charges (which clear themselves). Total: roughly $5.50/mo to keep five unused cards alive without managing subscriptions or remembering rotations.

What about credit-score side effects?

Mini-charges don't appear on your credit report individually — credit bureaus receive your statement balance monthly, not your transaction history. A $1 charge paid off before the statement closes contributes to a $0 reported balance, identical to no charge.

The strategy is invisible from a score perspective. Benefits are entirely on the issuer side: the card stays active, your credit line stays available, account-age clock keeps running, and you avoid the closure event that would otherwise hit your score. Bonus: keeping the card open preserves your utilization denominator — closing a card raises utilization on the rest of your portfolio even if your spending hasn't changed.

Bottom line

$1 is enough. The smallest posted charge does the same work as the largest. The only question is whether you'd rather handle the cadence yourself (free but disciplined), through subscriptions you'd buy anyway (free and reliable), or via automation that handles a portfolio at once (paid, zero overhead).

Pick one. Don't pick none.