Oregon’s tax rules shifted in 2026, and both individuals and small business owners need a clear picture of what changed. Income tax brackets were adjusted upward for inflation, the Oregon Commercial Activity Tax threshold stays at $1 million in gross receipts, and the 529 deduction limit rose to $4,865 per beneficiary. Oregon still carries no state sales tax, a genuine advantage over most neighboring states. The top personal income rate of 9.9% on high earners remains, making entity structure and deduction planning especially important for business owners. Quarterly estimated payment deadlines, mid-year entity reviews, and early documentation of expenses are the moves that separate prepared filers from reactive ones. Understanding these changes now, rather than in April, is what protects real money.