# Side hustle taxes: a plain guide

How side hustle income is taxed when you also have a job, why the rate is higher than you expect, and how to pay it through your paycheck.

Published October 27, 2026.

A side hustle is work you do for yourself next to a regular job. You might sell things you make, drive, tutor or freelance. If it becomes your full-time work, see our [first-year self-employed checklist](https://rightobooks.com/blog/first-year-self-employed-checklist/). The profit from it is taxable income.

Two things often surprise people. The profit is taxed at your highest income tax rate, because your salary uses up the lower rates first. And you also owe [self-employment tax](https://rightobooks.com/tools/self-employment-tax/) on it.

## The short version

- Side profit is added on top of your salary, so it is taxed at your top bracket.
- If your net earnings from self-employment are $400 or more, you also owe self-employment tax of about 14.1% of profit ([IRS Topic 554](https://www.irs.gov/taxtopics/tc554)).
- Nobody takes tax out of side income. You pay it yourself during the year.
- With a job, you can ask your employer to withhold more tax instead of making quarterly payments ([2026 Form 1040-ES](https://www.irs.gov/pub/irs-pdf/f1040es.pdf)).
- You must report the income even if no form is sent to you.

## Words to know

- **Profit:** what customers paid you, less your business expenses.
- **Tax bracket:** a band of income taxed at one rate.
- **Self-employment tax:** Social Security and Medicare tax for people who work for themselves. See [self-employment tax explained](https://rightobooks.com/blog/self-employment-tax-explained/).
- **Form W-4:** the form you give your employer to set how much tax comes out of your pay.

## Why the rate is higher

Income tax fills brackets from the bottom up. Your salary fills the lower brackets first. Side profit goes on top.

For 2026, the standard deduction for a single filer is $16,100. The 22% bracket for a single filer runs from $50,400 to $105,700 of taxable income ([Rev. Proc. 2025-32](https://www.irs.gov/pub/irs-drop/rp-25-32.pdf)).

## Self-employment tax

The rate is 15.3% (12.4% Social Security and 2.9% Medicare), on 92.35% of your profit ([IRS Topic 554](https://www.irs.gov/taxtopics/tc554)). You can deduct half of it from your income.

Social Security tax stops at $184,500 of earnings in 2026 ([IRS](https://www.irs.gov/instructions/i1040ss)). Your wages count toward that limit first. So if your job pays more than that, your side profit owes only the Medicare part.

## Pay it through your paycheck

Form 1040-ES says that if you also get a salary, you can file a new Form W-4 and ask your employer to take more tax out ([2026 Form 1040-ES](https://www.irs.gov/pub/irs-pdf/f1040es.pdf)). You put the extra amount per pay period in Step 4(c) of the W-4 ([Form W-4](https://www.irs.gov/pub/irs-pdf/fw4.pdf)). The IRS [Tax Withholding Estimator](https://www.irs.gov/individuals/tax-withholding-estimator) helps you find the amount.

You generally need to make [quarterly estimated tax](https://rightobooks.com/blog/quarterly-estimated-taxes/) payments only if you expect to owe $1,000 or more after withholding and credits ([2026 Form 1040-ES](https://www.irs.gov/pub/irs-pdf/f1040es.pdf)).

## Forms you may get

- **Form 1099-K.** For 2026, a payment app or marketplace must send one if your payments are more than $20,000 and more than 200 transactions ([IRS](https://www.irs.gov/newsroom/irs-issues-faqs-on-form-1099-k-threshold-under-the-one-big-beautiful-bill-dollar-limit-reverts-to-20000)). See [Form 1099-K explained](https://rightobooks.com/blog/form-1099-k-explained/).
- **Form 1099-NEC.** A business that pays you for services generally sends one if it pays you $2,000 or more after 2025 ([IRS](https://www.irs.gov/faqs/small-business-self-employed-other-business/form-1099-nec-independent-contractors/form-1099-nec-independent-contractors)).

The IRS says: "Whether or not you receive a Form 1099-K, you must still report any income on your tax return" ([IRS](https://www.irs.gov/businesses/understanding-your-form-1099-k)).

## An example

Theo builds side tables on weekends. (He is an example, not a real person.) His job pays $95,000, and he is single. His table profit for 2026 is $12,000.

His salary less the standard deduction is $78,900 of taxable income. That is in the 22% bracket, with room for his side profit too.

| Step | Amount |
|---|---|
| Self-employment tax: $12,000 × 92.35% × 15.3% | $1,695.55 |
| Half of it deducted from income | −$847.78 |
| Taxable side income | $11,152.22 |
| Income tax at 22% | $2,453.49 |
| Total extra federal tax | $4,149.04 |

That is about 35% of his side profit. Other deductions may lower it, and state tax may add to it. He is paid 26 times a year, so he adds about $160 in Step 4(c) of a new W-4.

Each real business cost, such as wood and marketplace fees, lowers both taxes. See [what counts as a business expense](https://rightobooks.com/blog/what-counts-as-a-business-expense/).

## A Righto tip

Keep the side business in its own account. In [Righto](https://rightobooks.com/), you import that account's statements (CSV, OFX or PDF), and the Profit and Loss report shows your profit so far. You can also ask your own AI agent, such as Claude Code, for that number. See [how agents work with Righto](https://rightobooks.com/agents/).

## Common questions

**Do I report side income if I got no 1099?**
Yes. The form rules decide when a payer sends a form, not what is taxable.

**Do I need quarterly payments if I have a job?**
Not if your withholding covers enough of your tax. Extra W-4 withholding is often the simpler way.

**Does my employer learn about my side hustle from the W-4?**
No. Step 4(c) is only a dollar amount.

## What to do now

1. Find your side profit so far this year.
2. Guess the profit for the full year.
3. Run the IRS Tax Withholding Estimator with your latest pay stub.
4. If you are short, give your employer a new W-4 with an amount in Step 4(c).
5. Open a [separate account](https://rightobooks.com/blog/separate-business-and-personal-finances/) for the side business.

[Righto](https://rightobooks.com/download/) is free, easy to use and needs no account.

## Sources

- [Topic no. 554, Self-employment tax](https://www.irs.gov/taxtopics/tc554), IRS
- [Instructions for Form 1040-SS (2025)](https://www.irs.gov/instructions/i1040ss), IRS
- [Revenue Procedure 2025-32](https://www.irs.gov/pub/irs-drop/rp-25-32.pdf), IRS
- [2026 Form 1040-ES](https://www.irs.gov/pub/irs-pdf/f1040es.pdf), IRS
- [Form W-4 (2026)](https://www.irs.gov/pub/irs-pdf/fw4.pdf), IRS
- [Tax Withholding Estimator](https://www.irs.gov/individuals/tax-withholding-estimator), IRS
- [IRS issues FAQs on Form 1099-K threshold (IR-2025-107)](https://www.irs.gov/newsroom/irs-issues-faqs-on-form-1099-k-threshold-under-the-one-big-beautiful-bill-dollar-limit-reverts-to-20000), IRS
- [Understanding your Form 1099-K](https://www.irs.gov/businesses/understanding-your-form-1099-k), IRS
- [Form 1099-NEC and independent contractors](https://www.irs.gov/faqs/small-business-self-employed-other-business/form-1099-nec-independent-contractors/form-1099-nec-independent-contractors), IRS