MultiW2

MultiW2 is a tax‑calculation utility designed for individuals who receive income from more than one employer. It aggregates the withholding information from each W‑2, applies the 2026 IRS tax brackets, and shows the combined tax liability, highlighting any gaps between employer withholdings and the actual amount owed.

The tool also offers scenario modeling, allowing users to adjust W‑4 entries per job, explore the impact of additional income sources such as consulting or side projects, and see how contributions to 401(k), HSA, and mega‑backdoor Roth accounts affect their tax picture while staying within IRS limits. Features include detection of Social Security overpayments and Medicare Additional Tax.

MultiW2 targets professionals with multiple jobs who need precise, consolidated tax estimates. A free tier supports up to three jobs with exact W‑2 calculations and a liability estimator, while a paid Pro tier provides unlimited jobs and advanced optimization features.