--- title: Prior year safe harbor method in Scenario Analysis description: Holistiplan can calculate the prior year safe harbor amount in Scenario Analysis, in addition to the 90% of current year safe harbor calculation. --- [Skip to content](https://help.holistiplan.com/safe-harbor-prior-year-scenario-analysis#main-content) English Show submenu for translations [More support](https://help.holistiplan.com/kb-tickets/new?hsLang=en) [![Holistiplan Logo (800x200 px).webp\]](https://help.holistiplan.com/hs-fs/hubfs/Holistiplan%20Logo%20(800x200%20px).webp?width=160&height=40&name=Holistiplan%20Logo%20(800x200%20px).webp)](https://www.holistiplan.com/) Open main navigation Close main navigation - English Show submenu for translations - [More support](https://help.holistiplan.com/kb-tickets/new) Holistiplan Knowledge Base - There are no suggestions because the search field is empty. 1. [Help Center](https://help.holistiplan.com/?hsLang=en) 2. [Scenario Analysis](https://help.holistiplan.com/scenario-analysis?hsLang=en) 3. [Scenario Analysis FAQ](https://help.holistiplan.com/scenario-analysis?hsLang=en#scenario-analysis-faq) # Prior year safe harbor method in Scenario Analysis ## Holisitiplan supports the prior year method to determine safe harbor amounts Taxpayers have two methods to achieve safe harbor status and avoid underpayment penalties: they can pay the lesser of 90% of the current year's tax bill or 100%/110% of the prior year's tax bill (depending on AGI of the prior year). Holistiplan supports both methods in Scenario Analysis, provided that the taxpayer has an uploaded return from the year prior to the one being modeled **and** that filing status does not change from year to year.  Additionally. the prior year return needs to have been a *filed* return; the system will not calculate prior year AGI/tax for returns marked "Draft." In the example below, Column 1 illustrates the information of an uploaded return, with Column 2 being a current year projection.    ![](https://help.holistiplan.com/hs-fs/hubfs/image-png-Aug-06-2026-02-31-07-9471-PM.png?width=601&height=80&name=image-png-Aug-06-2026-02-31-07-9471-PM.png)![](https://help.holistiplan.com/hs-fs/hubfs/image-png-Aug-06-2026-02-34-56-9350-PM.png?width=670&height=247&name=image-png-Aug-06-2026-02-34-56-9350-PM.png) In the Withholding Calculator, Holistiplan calculates 90% of the projected tax liability while also illustrating prior year AGI, prior year total tax (net of refundable credits) and the corresponding 100%/110% prior year tax amount. If prior year AGI was $150,000 or less ($75,000 or less if married filing separately), the safe harbor is 100% of prior year tax. If it exceeded that threshold, the safe harbor is 110%.  The bold amount reflects the *lesser* of the prior year and current year safe harbor calculations, reflecting the amount that the taxpayer needs to pay to prevent underpayment penalties. For scenarios created prior to the release of this functionality in August, 2026, changing the year or filing status of the scenario and then changing it back will trigger the system to look for a prior year return, and thereby result in the appearance of the prior year safe harbor information.  **Related resources** - IRS Instructions for Form 2210 (current year) — irs.gov/instructions/i2210 - IRS Publication 505, Tax Withholding and Estimated Tax — irs.gov/pub505   - [Getting Started at Holistiplan - 101](https://help.holistiplan.com/getting-started-at-holistiplan-101?hsLang=en#main-content) - [How to Contact Support](https://help.holistiplan.com/getting-started-at-holistiplan-101?hsLang=en#how-to-contact-support) - [Ready to Get Started?](https://help.holistiplan.com/getting-started-at-holistiplan-101?hsLang=en#ready-to-get-started) - [Getting Started with Your Households](https://help.holistiplan.com/getting-started-at-holistiplan-101?hsLang=en#getting-started-with-your-households) - 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