Best Business Credit Cards With No Preset Spending Limit

Because business expenses can vary widely from day to day, business owners often require a card that can adjust seamlessly with their needs. That's why it's helpful to have a card with no preset spending limit. "No preset limit" doesn't mean unlimited spending, nor does it guarantee that every charge will be approved. The amount you can spend adjusts based on factors such as your purchase and payment history.

» MORE: Best high-limit business credit cards

For power over payment: The Plum Card® from American Express

The Plum Card® from American Express turns the traditional premise of charge cards on its head by giving you the option to either pay your bill in full or defer a portion of it for up to 60 days. Each month, cardholders can:

Pay later with no penalty: Cardholders can defer a portion of their bill for up to 60 days by making at least the minimum monthly payment by the due date. With no interest or fees (if the balance is eventually paid in full), this essentially gives businesses owners a free 60-day credit line (see rates and fees).

Pay early and get a discount: If you choose to make at least the minimum payment on your bill within 10 days of your statement's closing date, you'll receive 1.5% of that payment as a credit on the next month's statement. For example: If your total bill is $1,000 and you pay $100 within the 10-day window, your next bill will be reduced by $1.50.

Paying your bill on time but outside the 10-day window results in no added drawback or benefit.

These options let business owners decide what to do with their money each month. If business is good, and you can afford to pay your card balance within the discount period, you'll pay less on the next bill. If business is a little sluggish, and cash is better spent on operating costs, you can pay a small portion of what's owed and cover the rest the next month.

The card does have a sizable annual fee of $250, however.

For flexible rewards: American Express® Business Gold Card

Businesses spend heavily in different areas. The American Express® Business Gold Card automatically determines which categories will earn the highest rewards, based on your spending habits.

The card earns 4 Membership Rewards points per dollar spent in two bonus categories (from a list of six) where cardholders spend the most each billing cycle (up to the first $150,000 in combined purchases per year; then 1 point back):

• Airfare purchased directly from airlines.

• U.S. purchases at restaurants.

• U.S. purchases for advertising in select media (online, TV, radio).

• U.S. purchases at gas stations.

• U.S. purchases made directly from select technology providers of computer hardware, software and cloud solutions.

• U.S. purchases for shipping.

Other spending earns 1 point per dollar spent. Terms apply (see rates and fees).

Membership Rewards points can be redeemed for a variety of travel options, gift cards, or simply a statement credit, so you'll have little trouble finding a use for your points.

The card's annual fee is $375.

For frequent travelers: The Business Platinum Card® from American Express

If your work calls for frequent flying and lengthy layovers, The Business Platinum Card® from American Express can make travel slightly less taxing with some of the best airport amenities around, such as:

Airport lounge access: This card offers free access to the AmEx Global Lounge Collection, which includes more than 1,400 lounges worldwide and could help make the time in an airport terminal more bearable.

Speed through security: Getting through security can be a breeze, as cardholders can use their card and get up to $189 back per year on their CLEAR® membership.

Airline fee credit: An additional annual credit of up to $200 for airline fees (checked bags, change fees, in-flight refreshments) makes The Business Platinum Card® from American Express an ideal choice for those looking to travel as comfortably as possible. Just be sure to select which airline you'd like the credit to apply toward before charging.

No foreign transaction fee: Forget paying foreign transaction fees — this card comes without added charges when swiping abroad.

Rewards: With this card, you earn 5 Membership Rewards points on flights and prepaid hotels booked through the American Express Travel website, and 1 point for each dollar you spend on eligible purchases. You also earn 1.5 points on eligible purchases at U.S construction material and hardware suppliers, electronic goods retailers, software and cloud system providers and shipping providers — as well as on purchases of $5,000 or more everywhere else, on up to $2 million of these purchases per calendar year(see rates and fees). Terms apply.

Points can be redeemed directly for travel through AmEx's travel platform, or even transferred to the participating frequent-flier programs of your choice.

You'll even start off with a generous welcome bonus: Earn 120,000 Membership Rewards® points after you spend $15,000 on eligible purchases with the Business Platinum Card within the first 3 months of Card Membership. Terms Apply. Keep in mind that the annual fee is $695. But if you're the type of frequent traveler who will benefit most from this card, that fee can be easily offset by the many statement credits available for purchases you're bound to make anyway.