Do I file as self-employed if I did laundry for someone throughout the year and they paid me for it?

Yes.

Even if they did not issue you any tax form, you should report this income on your tax return.

You report the income you received in cash, checks or bank transfers or without a 1099-NEC as self-employed income under Other self-employed income.

1. In business income, just under Type of Income, click on Add Income for this work
2. On the next page, click on the radio button next to Other Self-employed Income
3. Click Continue to enter your income received in cash, checks or bank transfers.

If you have expenses related to this business, you can deduct them.

To report your business income and expenses, you'll need to use TurboTax Deluxe or TurboTax Premium (Online) if you have expenses to deduct or any version of TurboTax (CD/Download).