Been doing this full time for over a decade and just got my 2023 tax bill. I've always been a sole proprietor, kept decent records, but the structure was a mess. Last year I finally listened to my accountant and set up an S-Corp for the agency side of things. The difference is insane. My affiliate income, all that network pay, still flows to me personally. That's straightforward. But the influencer management fees, the retainers, those go through the S-Corp now. The main benefit isn't some magic loophole. It's that I can now pay myself a 'reasonable salary' from the corp and take the rest as distributions, which aren't subject to self-employment tax. For me, that meant saving about 15% on that portion of my income. The real kicker was organizing expenses cleanly from day one. Business bank account for the corp, everything tagged properly in QuickBooks. No more scrambling in April trying to remember if that software subscription was for personal or that one affiliate test. It's not about hiding money, it's about clarity and paying what you actually owe - not more cuz you're disorganized. If your affiliate income is getting mixed with other services you provide like UGC creation or consulting, seriously look at separating it legally. Influencer marketing is 90% relationship management and 10% strategy but taxes are 100% a headache you can minimize with structure.