TaxTuneUp

TaxTuneUp helps W-2 employees optimize take-home pay by fixing the most common, boring, expensive mistake: incorrect withholding and missed pre-tax benefits. Users connect payroll (or upload pay stubs) and answer a short questionnaire about filing status, dependents, side income, and benefits. The app estimates year-end tax outcome, flags likely over-withholding or under-withholding, and generates step-by-step instructions to update W-4 settings and employer benefit elections (HSA/FSA/401k) with clear impact on each paycheck. It also tracks changes over time, warns when life events (marriage, new job, bonus, RSUs) likely broke your setup, and provides a “safe range” to avoid surprise tax bills. This is not a tax-filing app; it’s a paycheck optimization tool that stays useful year-round. Brutal truth: accuracy and trust are everything, so the product must be conservative and transparent.