What Are Card Limits? Definition

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Card Limits

Card limits are predefined caps that restrict how much a virtual card can spend over a given window. A limit can apply per transaction, per day, per month, or per billing cycle, and it is enforced at authorisation: once the cap is reached, further charges on that card are declined. Card limits are set per card rather than per account, which means a single business can run many cards on one credit line with a different ceiling on each.

Last updated: August 2026

Why card limits matter

A card limit is how a budget becomes enforceable. Without one, a client budget is a number in a spreadsheet that the ad platform has no knowledge of.

There is a trap, though. Set a limit exactly at the client's monthly budget and the card will decline on the last day of a strong month, at the worst possible moment. Ad platforms treat declines as a risk signal, and a pattern of them can slow delivery on the account. Most experienced teams set the card ceiling above expected spend and manage the budget inside the platform, using the card limit as a backstop rather than as the primary control.

Common Uses for Card Limits

Per client: the ceiling matches what that client has approved, with headroom.
Per platform: a Google card and a Meta card can carry different ceilings on the same client.
Per employee: a per-transaction cap sized to what that person is authorised to commit.
Per campaign: a lifetime cap on a card issued for a single flight.

Business examples

A client card set to $75,000 per month against a $60,000 budget. A per-transaction cap of $2,500 on a freelancer's card. A campaign card with a $15,000 lifetime limit that stops working once spent.

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Related terms

Card Controls

The rules a business sets on a payment card, including spending limits, merchant restrictions, and employee permissions.

Credit Limit

The maximum amount a cardholder can spend on a payment card before additional transactions are declined or reviewed.

Campaign Budget

The total amount allocated to an advertising campaign over a defined period, including daily, lifetime, or account-level budgets.

Billing Threshold

A payment setting used by advertising platforms that charges an account automatically once a predetermined spend threshold is reached.

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Frequently asked questions

What is the difference between a card limit and a credit limit?

A credit limit is the total the account can spend across every card. A card limit is the share of that total assigned to one card. An agency with a $2M credit limit might run 40 client cards with individual limits from $5,000 to $300,000, all inside the same $2M.

Do card limits cause ad platform declines?

They will if set too tightly. A card that declines mid-flight can pause delivery, and repeated declines can affect how a platform treats the account. Setting the ceiling above forecast spend, rather than exactly at it, avoids most of this.

Can card limits be changed after the card is issued?

On modern card platforms, yes, and instantly. Opal limits can be adjusted at any time from the dashboard.

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