Float Cards vs Credit Cards for Ad Spend
Float services like Plastiq, Melio, and a new wave of fintech players promise to extend your ad-spend payment terms by 30-60 days. The pitch is cashflow. The reality is a math problem: the float fee usually exceeds the rewards you'd earn — but not always.
By Editorial Team · Media buyer research desk
Published May 21, 2026 · 6 min read · How we review
What a float card actually is
A float service charges your credit card and pays your vendor (Meta) by ACH or wire. You then have your normal credit card billing cycle plus the platform's added float window to pay. Fees usually run 2.5%–2.9% on top of the underlying processor fee.
Net cost vs Amex Gold rewards
Amex Business Gold returns ~6-8% transfer value on ad spend. A 2.9% float fee leaves a 3-5% net positive — but only if you're transferring points at premium rates. Redeem at 1 cent/point and you're net-negative.
When floats make sense
If you're capital-constrained and the alternative is not running ads, the float fee is a finance cost, not a rewards play. Compare against your cost of capital, not against rewards.
When floats are wasteful
If you can pay your card on time, a float adds fees with no real benefit. Most agencies should optimize their billing cycle instead — use a card that statements on the 1st with a 25-day grace period and you've already got 55-day float natively, fee-free.
Hybrid: Brex Net-60 + Amex Gold
Some agencies use Brex's free net-60 product for cashflow and Amex Gold for rewards on the same spend (running different ad accounts on each). Best of both worlds, no fees.
Takeaway
Default to a rewards-optimized credit card with smart billing-cycle timing. Use floats only when capital truly constrains you, and price the fee as financing, not as a rewards strategy.