
Substack and Newsletter Writer Taxes: Schedule C, the Hobby-Loss Trap, and What You Can Deduct
Paid newsletter revenue on Substack, Ghost, or beehiiv is Schedule C self-employment income — owing 15.3% SE tax, quarterly estimates once you owe over $1,000, and facing a new 90% cap on hobby-expense deductions in 2026. Here's how the 1099-K thresholds, the 13–19% effective platform-fee cost, and the deduction rules actually work for writers.









