Freelance Writing and Content Creation: This is among the cheapest businesses to start using platforms like Fiverr. With minimal investment needed, it’s an accessible option.
Virtual Assistant Services: As a cheap business to start, focusing on email management and scheduling needs just a computer and internet.
Social Media Management: It's one of the cheapest businesses to start, specializing in Instagram or LinkedIn with low investment needed for tools.
Online Tutoring: As a cheap business to start, use platforms like Chegg, which demand little upfront cost for utilizing subject expertise.
Dropshipping: As one of the cheapest businesses to start using Shopify, it eliminates inventory costs.
Graphic Design Services: With initial software investment, it’s a cheap business to start specializing in logos and brand design.
Homemade Products Sales: As one of the cheapest businesses to start, selling unique items on Etsy requires minimal upfront costs.
Personal Fitness Trainer: Starting as an online personal trainer is among the cheapest in the fitness sector, focusing on virtual sessions.
Pet Services (Sitting/Walking): This is a cheap business to start, requiring minimal equipment as you build a local client base.
Food Delivery Service: A cheap business venture, catering to niche markets like vegan or organic can start small and scale with affordability.

Tip
Launching the cheapest business to start demands minimal investments. Focus on scalability, and remember that success can vary with market demand, location, and personal expertise.