There are many profitable small business ideas that can be started today. One idea is selling SEO services, which can be done by targeting a niche audience and leveraging past experiences and success stories. Another profitable small business idea is app development, which is in high demand by many companies. Bookkeeping, accounting, tax preparation, and payroll services are also highly profitable businesses with a net profit margin of 18.4% according to a 2017 Sageworks report. Other profitable small business ideas include pet care services, marketing services, and curating subscription boxes. Additionally, design and selling print-on-demand t-shirts is a low-investment business idea that can be easily started. Lastly, home improvement services are in high demand due to the growth of the real estate market in 2020 and the need for new homeowners to fix up their homes.