That whole angle has a 'fundamental' misunderstanding. Setting up an LLC with a separate EIN won't automatically lead to big tax savings. The IRS is pretty clear that your deductions need to be 'ordinary and necessary' for the business. Just changing the entity structure without real business expenses or activity won't do much but add paperwork. And you can't claim expenses that aren't genuinely tied to your affiliate work. The key is having a clear trail of legitimate business expenses and tracking everything independently. If your data isn't isolated properly, your deductions are 'useless' because you can't prove they're legit. So, before jumping into this, make sure your underlying data, expenses, and activity are actually there.