Chase's $0 annual fee Ink Business Unlimited® Credit Card has an amazing sign-up bonus: $750 bonus cash back after you spend $6,000 in the first 3 months after opening the card.
Keep in mind that this is awarded in the form of Ultimate Rewards points (so, 75,000 bonus points).
Beyond the amazing sign-up bonus, it also earns 1.5 points per $1 spent on the card.
If you have a Chase Sapphire Preferred® Card, Chase Sapphire Reserve®, or Ink Business Preferred® Credit Card, then every Ultimate Reward point you earn (across any Chase card!) can be combined into that account. Why does that matter? Those are the three Chase cards that allow you to transfer Ultimate Rewards points to their travel transfer partners, including:
Airlines: Aer Lingus, Air Canada, Air France/KLM Flying Blue, British Airways, Emirates, Iberia, JetBlue, Singapore Airlines, Southwest Airlines, United Airlines, Virgin Atlantic
Hotels: Marriott Bonvoy, World of Hyatt, IHG Rewards Club

If you're worried, “But I don't have a formal LLC, so I probably wouldn't get approved…”
Not so fast! You don't need a formal business entity to apply. Sole proprietorships can apply using their social security number. This allows businesses of all sizes to get access to business credit cards, including those who:
Sell items on Facebook Marketplace
Do contract consulting work
Babysit
You get the idea! This is one of the best Chase business credit cards. Don't miss out on the amazing sign-up bonus if this card is a good fit for your needs.
If you do end up applying for a credit card, I appreciate if you apply through the links I include on my website. These are my referral links. It doesn't cost you anything to apply through them, but it supports my small business. This helps me to continue making free content!