Earning extra income on top of your main job has become increasingly common in the US. Whether the goal is to pay off debt faster, build savings, or simply have more breathing room, the right side income depends on your skills, time, and circumstances.
Low-effort or passive options
- Selling unused items: Poshmark, eBay, Facebook Marketplace, Mercari, OfferUp. One-off effort that can turn existing possessions into a few hundred dollars.
- Cashback and rewards: using cashback portals such as Rakuten or TopCashback USA, and rewards credit cards paid in full, on spending you were doing anyway.
- Renting out a parking space or driveway: platforms such as SpotHero and Neighbor.com connect drivers and renters with people who have unused space.
- Renting out storage space: Neighbor.com also matches spare garage, basement or driveway space with people who need storage.
- Renting a spare room: taking in a roommate or lodger. Rent received is taxable rental income reported on Schedule E — there is no tax-free allowance for this in the US.
Skills-based income
- Freelancing: offer skills you already have — writing, design, development, marketing, bookkeeping — on platforms like Upwork and Fiverr, or directly to clients.
- Tutoring: strong demand across subjects and age groups, both in person and online through platforms such as Wyzant, Varsity Tutors and Preply.
- Consulting: if you have specialist professional knowledge, offering consulting outside your employed role can be valuable — check your employment contract and any non-compete first.
- Virtual assistance: administrative, scheduling and research work for small businesses, usually remote.
Gig economy options
- Food and package delivery: DoorDash, Uber Eats, Instacart, Amazon Flex — useful if you have a vehicle or bike.
- Rideshare driving: Uber and Lyft, where the economics depend heavily on your city and your vehicle costs.
- TaskRabbit: local handyperson, furniture assembly and moving tasks.
- Care work: platforms such as Care.com connect caregivers with families needing childcare, elder care or pet care.
What to consider before starting
- Check your employment contract for restrictions on outside work, moonlighting or non-competes
- Understand the tax implications — self-employment profit of $400 or more triggers self-employment tax, and you may need to make quarterly estimated payments
- Count the real costs honestly: gas, mileage, insurance, platform fees and self-employment tax all come out of the headline rate
- Check whether your auto insurance covers commercial or delivery use — most personal policies do not
- Start with what you already know, not what requires significant new learning
General guidance only — not regulated financial advice.
What different options realistically pay
- Selling unused items (one-off): highly variable, but a thorough household clear-out commonly produces a few hundred dollars
- Reselling clothing online (ongoing): modest per item, meaningful only with consistent listing activity
- Renting out a parking space: depends almost entirely on location — meaningful near stadiums, airports, hospitals and dense downtowns, negligible in low-demand areas
- Renting a spare room: the largest single option for most homeowners, but it is taxable rental income and involves sharing your home
- Tutoring: rates vary widely by subject, level and location, with test prep and specialist subjects at the higher end
- Freelance writing, design or development: the widest range of all, from very low starting rates to professional rates once established
- Gig delivery and rideshare: headline hourly figures look reasonable until vehicle costs, gas, depreciation and self-employment tax are deducted — track your actual net
Treat any income figure you see advertised for gig work with caution. The useful number is net of gas, mileage depreciation, insurance, platform fees and tax — not the gross the app displays.
The skills-income gap
The most important variable in side income is not effort but leverage: how much your existing skills are worth per hour. A teacher tutoring in their subject earns more per hour than the same person doing food delivery. A marketer doing freelance social media management earns more per hour than selling items online. Before choosing a side income, ask: what do I already know that someone would pay for?
Managing tax on side income
If your net self-employment earnings are $400 or more in a year, you generally owe self-employment tax and must file a return reporting the income, whether or not anyone sent you a 1099. Profit is reported on Schedule C, and you can deduct legitimate business expenses — equipment, software, supplies, mileage for business driving at the standard mileage rate, and a home office if it meets the IRS tests. Because nobody is withholding tax for you, quarterly estimated payments are usually required. Set aside 25% to 30% of profit from the first payment, in a separate account.
Comparing options by time investment
- Selling unused items: a few hours of setup, no ongoing commitment, one-off return
- Renting a parking or storage space: roughly an hour to list, then largely passive
- Renting a spare room: ongoing housekeeping and sharing your space, but the highest recurring return for most homeowners
- Tutoring: a few hours a week of active work, at a rate that reflects your subject knowledge
- Freelancing: ten to twenty hours a week to establish, then the widest income range of any option
- Gig delivery: fully flexible hours, lowest barrier to entry, lowest effective hourly rate once costs are counted
Starting with what you already have
The highest-return side income is usually an extension of existing skills rather than something entirely new. A teacher tutors. A designer takes freelance projects. A tradesperson does evening and weekend jobs. Starting with what you already know requires no learning curve, means your output quality is immediately good, and allows you to charge a fair rate from day one rather than working cheaply to build experience.