Industry code for Internet Marketing?

[hn]

I have 3 separate income sources (substantial). I'm confused which industry code will include all these 3: 

1. IT/Marketing Service revenue (the service I provide to my clients to build their websites and promote/market their companies online. I just get paid for my service, no commission)

2. Advertising Revenue: I sell banner ads on my website/blogs and earn revenue from it. For example, through google adsense.

3. Affiliate Commission Revenue: I market products from Product marketplaces (for instance Amazon) and when a sale is made, I get percentage commission from Amazon. I'm just using Amazon as an example here, the actual companies are different and they all have digital products (like ebooks) and I get commission when a sale is made through my online promotional efforts.

Please let me know if I have to add these as separate businesses or in just one. And what would the industry code?

[Bsch4477]

541800. Advertising and Related Services would do it.

[Bsch4477]

You could use 541800. Advertising and Related Services. If the businesses are closely related you can use the one code.

[Bsch4477]

Use 541800. Advertising and Related Services. The exact code used is not critical. If you think your businesses are closely related you can lump them together.

[hn · Accepted solution]

I entered 541800 as the code and TurboTax showed an error saying it's invalid because there's no such code. So I had to replace it with 541810 (Advertising agencies), which is somewhat similar.