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Accountack — Federal Income Tax Calculator Accountack Tax · Advisory · Strategy Tax Year 2026 Tax Year 2025 Form 1040 Estimator Federal Income Tax Calculator A comprehensive 2026 1040 projection — incorporating One Big Beautiful Bill (OBBB) provisions for SALT, charitable deductions, and credits. Real-time estimates with AMT, SE tax, NIIT, and Medicare surtax. Built for Accountack clients. Accountack © Accountack • Federal tax estimator — not legal or tax advice