Estimating 2025 Federal Taxes. The federal tax calculator is updated for the 2025/26 tax year and is designed for quick online tax calculations by entering your gross (total) income from tax form 1040 and your gross expenses from tax form 1040 for 2025/26. Tax estimator—figure out your taxes for the upcoming tax season.

The taxstimator will provide you with an estimate based on. Use our free 2025 tax refund calculator to estimate your 2025 taxes (currently based on data.