Tax season 2026 is a couple days away, and I’m telling you right now: if you file like you did last year, you could literally be losing money. In this complete guide for tax year 2025, I walk you through the key dates (January 26, 2026 through April 15, 2026) and the big updates you need to know—especially the new standard deduction amounts and the new deductions that can lower your taxable income. I break down the new tip and overtime deductions (and I’m very clear: these reduce taxable income, they’re not “cash refunds”), plus the car loan interest deduction rules (new car, assembled in the U.S., personal use, VIN required). I also explain the 2025 federal income tax brackets with an easy example, then jump into investing topics like the updated long-term capital gains rates. After that, I cover the earned income credit changes, child tax credits (including what’s actually refundable), daycare and adoption credits, and business topics like 100% bonus depreciation and updated Section 179 limits. And because this is my world, I finish with the biggest ACA/Obamacare tax warning: your 1095-A matters, premium tax credit repayments can hit hard, and starting in 2026 the repayment caps are going away—meaning everybody could be paying back the full amount if income doesn’t match.