Our IRS-supported approach
EstimatedTax follows a predictable prior-year safe harbor path. It checks the same annual target four times using withholding and payments that have already happened, without forecasting the rest of your income.
Prior-Year Safe Harbor with Actual Withholding
Why this fits uneven income
RSUs, bonuses, stock sales, and property gains can change your final tax bill without changing this prior-year target. Following each installment keeps you on this selected safe harbor path even when current-year income is unpredictable.
The Annualized Income Installment Method may allow a different or smaller schedule, but it is an optional alternative and is not needed to use this approach.
Important filing step
This app treats withholding as paid when it was actually withheld, rather than using the IRS default equal allocation. To use that treatment on your return, check Form 2210, Part II, box D and attach the completed form.
Tax software or a preparer may ask for withholding by period or date. Keep the paystubs used for each quarterly check. EstimatedTax helps plan payments; it does not prepare or file Form 2210.
Official references
This product supports a defined planning workflow and is not tax-return preparation, an IRS determination, or professional tax advice.