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Side hustle tax basics in the US: what to report (educational)

By FastBuySale Newsroom · 9 Nov 2026 · 27m ago

Why side hustle tax matters

Side income from freelancing, delivery apps, reselling, tutoring, pet sitting, content creation or rentals can make a real difference to household finances. It also changes your tax position. Unlike a paycheck, nothing is usually withheld, so the tax bill arrives later, often as a surprise.

This guide explains what you must report in the US and how, based on the IRS Gig Economy Tax Center and related guidance. It applies to the 2026 tax year, filed in early 2027. Rules can change and state taxes vary, so check the current guidance for your situation.

Rule 1: all income is reportable

The IRS is clear: income from a side hustle is taxable, and you must report it even if you do not receive a tax form, even if the amount is small and even if you are paid in cash, through an app or in digital assets. Income from selling items you made or bought to resell is business income. Selling your own used items for less than you paid is generally not taxable, because there is no gain, but keep records in case you need to show that.

Rule 2: are you in business or is it a hobby?

If you work with a profit motive and in a businesslike way, you are generally self-employed, and you report on Schedule C. The IRS looks at factors such as whether you keep records, the time and effort you put in, whether you depend on the income, your history of profits or losses and whether you change methods to improve profitability. A hobby's income is still reportable as other income, but hobby expenses cannot be deducted, so business treatment is usually better when you genuinely run it as a business.

Rule 3: self-employment tax starts at $400

If your net earnings from self-employment are $400 or more in the year, you must file a return and pay self-employment tax, which covers Social Security and Medicare. The rate is 15.3%, applied to 92.35% of net earnings, with the Social Security part capped at the annual wage base. You can deduct half of the self-employment tax when working out your income tax.

Rule 4: understand the tax forms you may receive

Clients who pay you $2,000 or more for services in 2026 generally send Form 1099-NEC; the threshold was $600 for earlier years. Payment apps, card processors and online marketplaces issue Form 1099-K when your payments exceed $20,000 and more than 200 transactions in the calendar year. Platforms may issue a 1099-K below that threshold voluntarily or because a state requires a lower threshold. A 1099-K shows gross payments, not profit, so it may include refunds, fees or personal transfers that you need to adjust for.

Rule 5: deduct ordinary and necessary expenses

Business expenses must be ordinary and necessary for your work. Common examples include supplies, software, equipment, platform and payment fees, advertising, a share of your phone bill and, if you qualify, a home office. For vehicles, you can use the IRS standard mileage rate, which is set each year, or actual expenses. Personal costs are not deductible.

Worked example: a delivery and reselling side hustle

Jordan works full-time and earns side income in 2026: $9,000 from food delivery and $4,000 from reselling thrifted clothes online. The clothes cost him $1,500, and he pays $600 in platform fees. He drove 6,000 business miles for deliveries. Using a standard mileage rate of 70 cents a mile for illustration, his vehicle deduction is $4,200. His net profit is $13,000 minus $1,500, $600 and $4,200, which is $6,700.

Self-employment tax is 15.3% of 92.35% of $6,700, about $947. Half of that, about $473, is deductible. His remaining profit is added to his wages and taxed at his marginal income tax rate. If his marginal rate is 22%, income tax on the side profit after the deduction is roughly $1,370. His total extra tax is roughly $2,300. He did not receive a 1099-K because neither platform reached the threshold, but he still reports everything.

Rule 6: pay estimated tax during the year

If you expect to owe $1,000 or more when you file, the IRS generally expects quarterly estimated payments. For 2026 income, the due dates are usually 15 April, 15 June and 15 September 2026, and 15 January 2027. If you also have a job, an alternative is to increase withholding from your paycheck using a new Form W-4, which can cover the tax on side income without separate payments. Paying too little during the year can lead to an underpayment penalty.

Rule 7: keep good records

Keep records of income from each platform and client, bank statements, receipts, invoices and a mileage log that shows dates, purpose and miles. The IRS generally recommends keeping records for at least three years after filing, and longer in some cases. A separate bank account for side income makes this easier.

What counts as a side hustle for tax

Common examples include ride-hailing and delivery, freelance writing, design and programming, tutoring, pet sitting, cleaning and handyman work, selling handmade goods, reselling items bought for profit, online content and sponsorships, renting a room or car, and paid surveys or reward programmes. Gift cards and points that you redeem from reward apps can also be income in some cases. If you are unsure whether something counts, the safest approach is to record it and check IRS guidance or ask a tax professional.

How the forms fit together

Schedule C reports income and expenses for each business. Schedule SE works out self-employment tax. The net profit from Schedule C flows to Form 1040 along with wages and other income. If you have more than one side business with different activities, you may need a separate Schedule C for each. Information forms such as 1099-NEC and 1099-K help the IRS match income, but your Schedule C should be based on your own records, which may differ from the forms because of fees, refunds or timing.

Worked example: estimated payments

Kim expects $12,000 of net side profit in 2026 on top of her salary and estimates about $3,600 of extra federal tax. Rather than paying a lump sum in April 2027, she makes four estimated payments of $900 using IRS Direct Pay on the quarterly due dates. Alternatively, she could have raised her paycheck withholding by about $150 a semi-monthly pay period through a new Form W-4, which would cover the same amount spread over 24 paychecks.

State and local taxes

Most states tax side income as part of your state income tax, and some cities do too. Sellers of goods may need to collect sales tax, although marketplaces collect it for sellers in states with marketplace facilitator laws. Some cities require business licences even for home-based side businesses.

Selling personal items versus reselling

Many people now receive a 1099-K after clearing out a wardrobe or garage on a marketplace. Selling your own personal items at a loss is generally not taxable, because you sold for less than you paid. If you receive a 1099-K for such sales, the IRS explains how to report the amounts so that no tax is due on them. Buying items specifically to resell at a profit, however, is a business, and the profit is taxable.

Retirement savings

Self-employed income can be used to contribute to retirement accounts such as a SEP IRA or a solo 401(k), which can reduce taxable income. Limits depend on your net earnings and any employer plan contributions.

Common mistakes

- Not reporting income because no 1099 arrived.

- Treating a 1099-K total as profit and paying tax on fees and refunds.

- Forgetting self-employment tax when estimating the bill.

- Missing mileage deductions because no log was kept.

- Mixing personal and business spending.

Quick estimate

The percentage calculator on this site can help work out how much of each payment to set aside, and the salary calculator helps compare side income with a pay rise from your main job. This article is general information about US federal tax rules and is not tax or financial advice. For complex situations, consult a tax professional or the IRS website.

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