Estimated Tax Calculator
Set up and manage quarterly estimated tax calculations with entity-specific configurations.
The Estimated Tax Calculator helps you estimate quarterly federal and state tax obligations for a selected tax year. It supports C-Corporations and pass-through entities (S-Corps, partnerships, sole proprietors) with entity-specific configurations.
Getting Started
When you first visit the Estimated Tax page for a company, you will see one of three states:
Uninitialized
No tax configuration exists for the selected year. A setup wizard walks you through the initial configuration.
In Progress
A configuration exists and you can edit assumptions, enter quarterly payments, and review analytics across multiple tabs.
Finalized
The configuration has been locked. A read-only worksheet view displays the finalized calculations. You can reopen a finalized configuration if adjustments are needed.
Tax Year Selector
A year dropdown in the page header lets you switch between tax years. The available range covers the current year and the three prior years.
Setup Wizard
If no configuration exists for the selected year, the wizard guides you through these steps:
- Entity type -- choose between C-Corporation, S-Corporation, Partnership, or Sole Proprietor
- State of filing -- select the state where the entity files
- Accounting method -- choose cash or accrual
- Prior year return -- enter prior year taxable income, tax liability, and any overpayments for both federal and state
- Safe harbor method -- select an advanced option for the safe harbor calculation
After completing the wizard, the system initializes the tax year configuration and you land on the tabbed interface.
Tabs
Once a configuration exists, the page displays tabs for managing different aspects of the tax estimate.
Overview
Displays calculated analytics including:
- Estimated total tax liability (federal and state)
- Safe harbor amounts
- Quarterly payment schedule with deadlines
- Variance analysis comparing estimates to actuals
This tab becomes available after you complete the Entity Setup and Current Year sections.
Entity Setup
Configure the entity type, state of filing, and accounting method. Changes here affect all downstream calculations.
Prior Year
Enter prior year return data used for safe harbor calculations:
- Federal and state taxable income
- Federal and state tax liability
- Federal and state overpayments applied
- Prior year adjusted gross income (AGI)
Current Year
Set current year assumptions:
- Forecasted net income
- Book-to-tax adjustment amounts
- Federal and state tax rate assumptions
Owners
Available for pass-through entities only (not C-Corporations). Manage individual owners and their tax-related information:
- Owner name and ownership percentage
- Filing status and resident state
- Self-employment tax details
- Other income sources
- Prior year AGI and tax payments
You can add multiple owners and delete owners as needed.
Quarterly
Review and edit quarterly estimated tax payments for both federal and state. The table shows:
- Payment amounts per quarter
- Payment deadlines
- Cumulative payments
For pass-through entities with owners, an additional section shows per-owner quarterly breakdowns.
Actual Tax
Enter actual tax amounts once returns are filed:
- Actual federal tax
- Actual state tax
- Return filed dates
This data feeds into variance analysis on the Overview tab.
Advanced
Configure advanced tax options including:
- Safe harbor method selection
- Net operating loss (NOL) carryforwards (federal and state)
- Estimated credits (federal and state)
- Permanent and temporary differences
- Alternative minimum tax (AMT) prior year amount
- Capital loss carryforwards
- State-specific settings (apportionment, PTET elections, franchise tax)
- QBI (Qualified Business Income) eligibility and amounts
Finalizing a Configuration
When you are satisfied with the tax estimates, click the Finalize button in the page header. This locks the configuration and generates a finalized worksheet view. Finalizing prevents accidental changes and preserves a record of the estimates.
To make changes after finalizing, use the Reopen action to return to the editable state.
Related Pages
- Income Statement -- source data for net income forecasts
- Company Overview Dashboard -- high-level financial summary
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