What is an estimated tax voucher?

An estimated tax voucher is the payment slip (Form 1040-ES for individuals) accompanying quarterly estimated tax payments, identifying the taxpayer and tax period for proper IRS credit. For professional service firm owners making quarterly payments, vouchers ensure payments are applied correctly to their account.

Key characteristics

• Accompanies estimated payment

• Identifies taxpayer

• Specifies tax year and quarter

• Form 1040-ES for individuals

• Form 1120-W for corporations

• An electronic payment alternative is available

Why it matters for professional service firms

Payments without proper identification may be misapplied or lost. Vouchers ensure IRS credit payments are made correctly. Professional service firm owners making estimated payments should use vouchers or electronic payments with proper identification to ensure accurate account crediting.

Real-world example

Sarah mailed the $15,000 Q3 estimated payment without a voucher. Payment was posted to the wrong tax year due to a missing identification. Received an IRS notice for unpaid current year estimates, while the prior year showed an overpayment. Resolution required phone calls and documentation. New process: use EFTPS for electronic payment with automatic identification, or mail with a completed voucher attached—no subsequent misapplication.