What is year year-end tax estimate?

Year-end tax estimate projects total tax liability for the year based on actual results through a date and projected results for the remainder, enabling tax planning actions before year-end. For professional service firm owners, this estimate identifies opportunities for deductions, retirement contributions, and income timing before the tax year closes.

Key characteristics

• Projects full-year tax liability

• Based on actual and projected results

• Enables pre-year-end planning actions

• Should be prepared by October or November

• Includes federal, state, and self-employment taxes

• Foundation for year-end tax planning

Why it matters for professional service firms

Effective tax planning requires knowing where you will end up before year-end. A year-end tax estimate enables proactive planning: maximizing deductions, timing income, funding retirement accounts, and managing estimated payments. Professional service firm owners should prepare estimates by October to allow time for planning actions.

Real-world example

Lisa prepared year year-end tax estimate in early November: projected taxable income $385K, estimated tax liability $112K, quarterly payments made $95K, balance due $17K plus the 4th quarter estimate. Opportunities identified: additional SEP contribution possible ($15K, saving $4.5K tax), equipment purchase under consideration could be accelerated to this year (Section 179 benefit $3.2K), deferring December client payment would shift $25K income to next year (timing benefit if next year projected lower). Actions taken saved $9K in taxes that would have been missed without the November estimate.