America's side hustle economy has a tax problem

The typical annual revenue for an independent business is near $19,200 at the midpoint of 31 industries, closer to supplemental income than to a full salary, data from 1-800Accountant's 1099 Earnings Report shows. That describes the situation for a lot of Americans: About 1 in 3 report having a side hustle, according to a LendingTree survey conducted in March 2026, with gig and on-demand work the most common type. The income is real, but the tax system it flows through was built around the paycheck.

A W-2 paycheck arrives with taxes already taken out. Side income usually arrives whole. A rideshare payout, a freelance invoice or a weekend of craft fair sales lands in a bank account with no income tax withheld and nothing set aside for Social Security or Medicare. The person who earned it becomes responsible for all of it, including the employer-equivalent share of Social Security and Medicare taxes.

That gap between how side income is paid and how it is taxed is where a large share of side earners get into trouble. 1-800Accountant examines the tax challenges facing America’s side hustle economy.

The bill nobody withholds

Net self-employment earnings of $400 or more are generally subject to self-employment tax, a 15.3% tax made up of 12.4% for Social Security and 2.9% for Medicare. That comes on top of federal income tax and, in most states, state income tax.

The IRS also expects those taxes to be paid throughout the year, not just in April. Federal taxes run on a pay-as-you-go basis, so anyone without withholding who expects to owe $1,000 or more is generally required to make quarterly estimated payments. The 2026 deadlines fell on April 15, June 15, and Sept. 15, and the final payment, covering income earned from September through December, is due Jan. 15, 2027. Missing a payment can trigger an underpayment penalty even when the full balance is paid at filing time.

Even established business owners struggle with that calendar. Data from 1-800Accountant's 2026 Small Business Tax Confidence Report, a survey of 300 small business owners and managers, shows that 45% named quarterly estimated taxes as the deadline they were most likely to miss, more than any other. Nearly 60% said they had received an IRS notice or penalty at least once.

Those respondents run businesses, often with bookkeeping systems already in place. The survey doesn’t establish whether the gap is wider among people for whom self-employment is a second job, squeezed in around a full-time schedule and often handled without an accountant.

Small earnings, outsized consequences

Most side income is modest. The 1099 Earnings Report, which analyzed revenue and expense data from thousands of independent businesses, freelancers and contractors, found typical annual revenue ranging from about $850 to $77,000 depending on the industry.

At those levels, expenses decide the tax bill. In 10 of the 31 industries, the typical business reported more in expenses than in revenue. Every documented, deductible business expense lowers the profit that income tax and self-employment tax are calculated on. An undocumented expense may be disallowed as a deduction, increasing taxable profit.

Documentation is also where confidence tends to break down. In the Tax Confidence Report, 46% of respondents said they were unsure how to handle vehicle and mileage expenses, and more than 57% admitted to deducting an expense they were uncertain about. Overstating deductions carries its own cost: The IRS accuracy-related penalty can add 20% of the underpaid tax.

Mileage shows how quickly the details shift. In a rare midyear change, the IRS raised the business standard mileage rate from 72.5 cents to 76 cents per mile for driving on or after July 1, 2026, under Announcement 2026-11. A delivery driver who logs 8,000 business miles in the second half of the year can deduct $6,080 for those miles, compared with $5,800 at the old rate, but only with a log that separates trips before and after July 1.

Fewer forms, same tax

Another change arrives with the coming filing season. For payments made in 2026, businesses generally must issue Form 1099-NEC or Form 1099-MISC when reportable payments reach $2,000 or more, up from the $600 threshold that had been in place for decades, according to the IRS instructions for those forms.

The change will cut paperwork for businesses. It also removes a reminder. A freelancer who earns $1,500 from a client this year may receive no form in January, yet that income is still taxable. For side earners who have relied on a stack of 1099s to tell them what they earned, the paper trail is getting thinner while the obligation stays exactly the same.

Closing the gap

The side hustle tax problem is largely a timing problem. Income arrives continuously, while the tax system checks in quarterly and settles up once a year. Side earners who get through filing season without surprises tend to close that gap in small, routine ways: setting aside a share of each payment as it lands, recording expenses when they happen and sizing quarterly payments against the IRS safe harbor rules. Those rules generally help taxpayers avoid underpayment penalties if they pay at least 90% of the current year's tax or 100% of the prior year's tax (110% for those with prior-year adjusted gross income above $150,000).

Free tools have made that last step easier to manage. Some quarterly estimated tax calculators for 1099 earners fold the safe harbor rules and state payment schedules into a single estimate.

The survey data points in the same direction. In the Tax Confidence Report, respondents who kept business and personal finances separate and tracked expenses year-round reported the most confidence at tax time. That suggests the difference between calm and stressed filers comes down to routine more than tax expertise.

For millions of households, side income has become part of the monthly budget. The tax habits around it have not caught up yet. Until they do, the Jan. 15 deadline and a thinner stack of 1099s next year are likely to catch plenty of people off guard.

This story was produced by 1-800Accountant and reviewed and distributed by Stacker.