If you know you are not receiving a W-2 or 1099 form because you were paid in cash or without a pay stub, you will need to enter the income as "self-employment income" in TurboTax.
To do this, go to your Federal Return, select the "Wages & Income" tab at the top of the screen. Then scroll down to "self-employment income" and then go through the prompts to "add this line of work." Eventually, you will come to a screen to add your income.
When you are entering information about your self-employment business, the screens may ask you things such as whether you had employees, whether you had someone do work FOR you where you gave them a 1099 form (so this wouldn't be related to your income or you receiving a 1099 form), or if you have an Employer ID number, etc. These screens can all be answered in the negative that you didn't have employees, a 1099 contractor, or an employer ID number.
After these screens, a summary will be shown where TurboTax asks you to review your self-employment business. If you select "It looks good" you should then proceed to the screen to enter your income.
There should be a screen that says "Let's Get Income" and you will want to select the line labelled "Additional Income and Other Income. A sample screenshot is attached.
On the next screen, enter a description of the income received and then the total amount you were paid for the year.
Be aware that you will have to pay Self-Employment taxes on this income.
