What business can I start with $100?
With 100 dollars, start a service or resale business where the money buys tools and reach, not inventory. Realistic options: a productized service (review responses, listing creation, bookkeeping-adjacent admin, simple automations), reselling sourced-on-demand goods, or a niche content brand. The 100 dollars typically covers a domain, one tool subscription, and a basic logo; the rest of the work is your time and outreach. Our vetted ideas bottom out at an under-1,000-dollar band, so 100 dollars means service-first. Use the Startup Cost Calculator to place every dollar.
One hundred dollars does not buy a business; it buys the setup for one. So spend it where it removes friction, not on inventory or ads. A sane first-100-dollar budget looks like a domain (about 10-to-15 dollars), one month of a key tool (roughly 20-to-40 dollars), and a simple logo or brand kit (0-to-30 dollars using free tools), leaving a small buffer. Everything else, the actual business, is your time and your outreach, which cost nothing but effort.
Choose a model that pays before it spends. Productized services fit best: review-response management for local hotels and restaurants, done-for-you listing or keepsake creation, YouTube thumbnail optimization, or light AI automation for a small firm. In our Idea Bank these are recurring services (161 of 220 ideas recur) that often bill within a month, so your 100 dollars is bridging to first revenue, not funding a long runway. Reselling works too if you source only what is already sold, so you never tie the 100 dollars up in stock.
Set honest expectations against the data. Our 220 vetted ideas start at an under-1,000-dollar band, which means a true 100-dollar business is almost always a service or content play, not a product or inventory business. Content (a newsletter or niche site) is genuinely startable for 100 dollars but is a multi-month build to real money, while a service can land a paying client in weeks. Pick based on whether you need cash soon or can invest patience.
Place every dollar deliberately and validate first. Run the Startup Cost Calculator to see exactly where the 100 dollars goes, then score your pick on the Idea Validation Scorecard so you are not spending even that little on an idea with no clear buyer.
Prompts to try
Copy these into ChatGPT or Claude to go deeper.
Give me 8 businesses I can genuinely start for under $100, each with a line-item budget, the buyer, margin, and how I get the first customer.
For [service idea], plan my $100 budget across domain, tools, and branding, and tell me what to skip to preserve cash for outreach.
Compare a $100 service business vs a $100 content business for someone who needs income within 3 months, and recommend one.