There isn't a specific one geared towards just network marketing as a whole, if you are inquiring about which business code to use. You can do a search for your type of work by clicking the blue Look up my business code option when you are logged into TurboTax and it will open Look up your business code screen to the right with a list of industries.
You can browse those to see which match closely to your line of network marketing. And if you don't see anything that matches your specific work, just put in 999999, which is miscellaneous.
It's not something the IRS needs nor will it have an affect on your return.
This one below can be used if it's considered network marketing/direct sales industry, but you can also use 999999 if you'd prefer:
- "Other direct selling establishments (including door-to-door retailing, frozen food plan providers, party plan merchandisers & coffee-break service providers" (454390)
What is the Business Code used for?