Tax Planning Best Practices

When to Update Your Tax Model

Your tax model is a living document that should evolve with your client's situation. Consider updating when:

Trigger Event	Why Update Matters
Income Changes	Client receives a raise, bonus structure changes, or changes jobs
Filing Status Changes	Marriage, divorce, or dependent status changes dramatically impact tax brackets and deductions
Major Deduction Changes	Bought/sold home, large charitable gift, significant medical expenses
Tax Law Changes	New legislation affects brackets, deductions, or credits
Before Strategy Modeling	Ensure baseline is current before testing equity compensation scenarios
Annual Review	At least once per year to maintain projection accuracy
After Equity Events	Major vesting or exercise events should trigger baseline recalibration

Best Practices for Accurate Projections

Start with Accurate Baseline Data

Verify W-2 wage information
Confirm filing status and dependents
Review deductions and credits carefully
Use most recent tax return as reference

Model Multiple Scenarios

Conservative: Lower growth assumptions, higher tax rates
Moderate: Most likely case based on current trajectory
Aggressive: Higher growth assumptions, optimal timing

Account for Quarterly Estimated Tax Payments

Calculate total annual tax liability
Subtract expected withholding
Divide remaining balance by 4 for quarterly payments
Set reminders for payment deadlines (April 15, June 15, September 15, January 15)

Plan for Tax Reserves

Set aside cash for anticipated tax bills
Consider higher withholding for equity compensation events
Build buffer for potential AMT triggers

Review Regularly

At minimum, annual review
More frequently during years with major equity events
After any significant life changes

Working with CPAs

Grantd is a planning tool, not a replacement for professional tax preparation:

Share Grantd Projections with CPA

Provide 5-year projection as planning context
Discuss equity compensation strategies
Verify state tax treatment
Confirm estimated tax payment calculations

When to Involve CPA Early

Complex AMT situations
Multi-state tax issues
Significant equity compensation events (>$100K income impact)
Business ownership or self-employment income
International tax considerations

What CPAs Value from Grantd

Forward-looking tax projections
Scenario modeling capabilities
AMT calculations
Documentation of equity compensation timing

Important Disclaimers

Estimates Only

All tax calculations are estimates based on current tax law and the information you provide. They should not be relied upon as the sole source for tax planning decisions.

Not Tax Preparation

The Grantd platform is for planning and scenario modeling, not tax return preparation. Always work with a qualified CPA or tax professional for filing.

Input Accuracy

The quality of outputs depends on the accuracy of inputs. If data is entered manually or uploaded via the Grantd AI statement reader, verify for errors.

Tax Law Changes

Tax laws change frequently. The Grantd team works diligently to keep the engine current, but always verify current law with a tax professional.

State Tax Complexity

State tax calculations use a simplified rate-based approach. Complex state rules (e.g., California RSU sourcing, multi-state situations) require CPA analysis.

No Guarantee of Penalty Avoidance

While Grantd helps model tax liabilities, it does not guarantee compliance with estimated tax payment requirements or avoidance of underpayment penalties.

Key Takeaways

Tax models are living documents - Update them regularly as circumstances change
Estimates are not guarantees - Use for planning, verify with CPA for filing
Pay-as-you-go matters - Don't wait until April 15 to address tax liability
AMT is real - Model it before exercising ISOs
Withholding gaps exist - Plan for additional payments on equity comp
State rules vary - Don't assume federal treatment applies to state
Timing is strategy - When events occur matters as much as if they occur