Can you deduct Google Ads if your site earns Amazon affiliate commissions?

Generally, yes: if your Amazon affiliate site is being run as a real business, Google Ads can usually be deducted as a business advertising expense.

Key points:

• The expense should be ordinary and necessary for your business.
• You generally need to be operating with a profit motive and treating the site like a business, not a hobby.
• If you’re a sole proprietor or single-member LLC taxed as a disregarded entity, these costs are typically reported on Schedule C as advertising/marketing expenses, but the exact line can vary by form year and filing situation.
• Keep good records: invoices, receipts, campaign reports, and a clear link between the ad spend and the affiliate business.

A couple of important cautions:

• If the activity is treated as a hobby under your tax rules, deductions can be limited or unavailable, so the income may not be offset by the ad spend.
• Amazon and Google policies can change. Amazon Associates generally restricts or prohibits certain paid-traffic setups, especially if paid traffic goes directly to Amazon affiliate links, so verify the current Amazon Associates Operating Agreement before relying on any setup.

So the short answer is: usually yes, if it’s a legitimate business expense and you keep proper documentation. For exact treatment in your situation, check with a CPA or tax professional.