The Side Hustle Glossary: 60+ Terms Explained

Quick answer: Side hustle jargon falls into five groups: work models (gig, freelance, contract), selling models (dropshipping, print-on-demand, arbitrage), online income (affiliate, ad revenue, UGC), money terms (gross, net, take rate), and tax terms (1099, Schedule C, trading allowance). Learn these 60+ terms, and you can read any side hustle guide, platform fee page, or tax form without guessing.

Work models

• Side hustle — Paid work you do alongside a main job, studies, or caregiving.
• Gig — A single, short paid task, often booked through an app (one delivery, one logo).
• Gig economy — The market of short-term, app-based or task-based work.
• Freelancer — A self-employed person who sells a skill to several clients.
• Independent contractor — The legal status of most freelancers: not an employee, no withholding.
• Retainer — A fixed monthly fee a client pays for ongoing work.
• Productized service — A fixed-scope, fixed-price service (“5 blog posts for $400”).
• Micro-task — Very small online jobs such as tagging images or short surveys.
• Portfolio — Samples of past work that prove your skill to clients.
• Niche — The narrow audience or topic you focus on.

Selling models

• E-commerce — Selling products online.
• Dropshipping — You sell products a supplier ships directly; you never hold stock.
• Print-on-demand (POD) — Your design is printed only after a customer orders.
• Retail arbitrage — Buying discounted items in stores and reselling online for profit.
• Online arbitrage — The same, but sourcing from online stores.
• Flipping — Buying used items, improving or relisting them, and selling higher.
• Reselling — Selling goods you did not make, new or used.
• Digital product — A downloadable item: templates, ebooks, presets, courses.
• Marketplace — A platform that brings buyers to sellers (Etsy, Amazon, Fiverr).
• Storefront — Your own branded online shop (Shopify, WooCommerce).
• Inventory — Stock you own and must store.
• SKU — A unique code for each product variant.

Online income and content

• Affiliate marketing — Earning a commission when someone buys through your link.
• Commission — A percentage of a sale paid to you or taken by a platform.
• Ad revenue — Income from ads shown on your videos, blog, or podcast.
• RPM — Revenue per 1,000 views, after the platform’s cut.
• CPM — Cost an advertiser pays per 1,000 ad impressions.
• UGC (user-generated content) — Videos or photos you make for brands to use in ads.
• Creator economy — People earning from audiences on social platforms.
• Sponsorship — A brand pays you to feature its product.
• Faceless channel — A YouTube or social account that never shows the creator.
• Newsletter — An email publication you can monetize with ads or paid subscriptions.
• Lead magnet — A free resource offered in exchange for an email address.
• Funnel — The steps that move a visitor from interest to purchase.
• Traffic — Visitors to your page, shop or profile.
• SEO — Optimizing content to rank in search engines.
• AEO — Optimizing content so AI answer engines cite it.

Money terms

• Gross income — Total money received before any costs.
• Net income (profit) — What remains after expenses and fees.
• Margin — Profit as a percentage of the sale price.
• Take rate — The share of each sale a platform keeps.
• Service fee — A platform’s cut of freelancer earnings.
• Payout — Money transferred from a platform to your bank.
• Startup cost — What you must spend before earning the first dollar.
• Overhead — Ongoing costs that don’t change with sales (software, subscriptions).
• ROI — Return on investment: profit divided by what you spent.
• Passive income — Income that keeps coming with little ongoing work after setup.
• Active income — Income tied directly to hours worked.
• Scaling — Growing income without growing hours at the same rate.
• Hourly rate — What you earn per hour of work, after fees.

Tax and legal terms

• Self-employment tax — US Social Security and Medicare tax for the self-employed (15.3%).
• 1099-NEC — US form reporting payments to contractors.
• 1099-K — US form from payment platforms reporting your sales.
• Schedule C — US form for business profit or loss.
• Estimated taxes — Tax payments made during the year instead of at year-end.
• Trading allowance — The UK’s £1,000 tax-free allowance for side income.
• Self Assessment — The UK’s tax return for self-employed income.
• T2125 — Canada’s form for business or professional income.
• Sole proprietor — A one-person business with no separate legal entity.
• LLC — A US business structure that separates personal and business liability.
• Deductible expense — A business cost that lowers taxable profit.
• Hobby income — Income from an activity not run to make a profit; taxed differently.

How to use this glossary

Bookmark it, and check a term the first time you see it on a platform fee page or tax form. Each term links to a full guide on GetSideHustles where one exists.

FAQ

What is the difference between a gig and a side hustle?

A gig is one task; a side hustle is the ongoing activity that may be made of many gigs.

Is freelancing the same as a side hustle?

Freelancing can be a side hustle when done part-time alongside a main job, or a full-time career.

What does passive income really mean?

Income that needs little ongoing work after setup. Most “passive” income needs real work up front and regular upkeep.

What is a take rate?

The percentage of each sale a platform keeps — for example, Fiverr keeps 20% of each order.