WithholdIQ

WithholdIQ is a mobile + web app that continuously estimates your year-end income tax outcome using real paystub data, not rough calculators. Users upload or forward paystubs (or connect payroll providers) and the app tracks YTD wages, bonuses, RSUs, overtime, pre-tax deductions, and filing status changes. It then recommends precise W-4 adjustments (or equivalent local forms) and shows the impact per paycheck: expected refund/balance due, safe-harbor risk, and cash-flow tradeoffs. The app is brutally practical: it won’t “optimize” with shady advice; it focuses on avoiding under-withholding penalties and eliminating big April surprises. It also supports life events (marriage, new job, side gig) with quick scenario planning and reminders to update withholding. Monetization: subscription for individuals and a lightweight employer perk plan for HR teams.