--- title: When An Employee's Form W-4 Raises Red Flags description: FocusPay Solutions helps business owners navigate employee Form W-4 requirements and provides guidance on responding to IRS lock-in letters. image: https://info.machen.cpa/hubfs/w-4-2265528633-social.jpg --- [Family of Services](http://machenmcchesney.com/about-us/family-of-companies/)  |  [CPA & Business Advisory](http://machenmcchesney.com)  |  [Payroll, HR & Benefits](http://focuspaysolutions.com/)  |  [Wealth Management](http://machenmcchesney.com/services/financial-planning-and-wealth-mangement-services/) Auburn-Opelika (334) 887-7022 | Montgomery (334) 244-8900 [![mm-cobrand-fd-blues](https://info.machen.cpa/hs-fs/hubfs/mm-cobrand-fd-blues.png?width=279&height=100&name=mm-cobrand-fd-blues.png)](http://machenmcchesney.com) Search this site on Google Search Google Search this site on Google Search Google - [Client Portal](https://machenmcchesney.sharefile.com/Authentication/Login) - [1040 Electronic Organizer](https://www.my1040data.com/account/login/HT7902990) - 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Most forms are routine, but an altered certificate, unusual accompanying statement, or IRS lock-in letter may require special handling. Knowing how to respond can help your business meet its withholding obligations without becoming involved in an employee’s personal tax dispute. **Recognizing an invalid form** An employee is responsible for the information provided on Form W-4 and signs the form under penalties of perjury. Businesses generally aren’t required to verify whether the employee’s filing status, credits, deductions, or other adjustments are accurate. However, a Form W-4 may be invalid if the employee: - Alters the official form, - Deletes or crosses out the penalties-of-perjury declaration, or - Indicates that information on the form is false. You must also reject any substitute form created by an employee. An electronic or substitute form developed by your business may be acceptable if it meets IRS requirements. If an employee submits an invalid Form W-4, you should explain that you can’t accept it and should request a valid replacement. You can generally continue using any valid Form W-4 already in effect until you receive the replacement. If you don’t have a valid form already on file, withhold as if the employee selected “single or married filing separately” and made no entries in Steps 2, 3, or 4. Similarly, a claim of exemption from withholding isn’t automatically invalid. Beginning with the 2026 Form W-4, employees claiming exemption from withholding use the exemption checkbox on the form. For 2026, an employee generally may claim exemption only if the employee had no federal income tax liability in 2025 and expects to have none in 2026. The employee — not the employer — is responsible for determining whether those requirements are met. **Responding to IRS instructions** Businesses aren’t required to routinely send Forms W-4 to the IRS. You generally must submit these forms only when directed to do so in a written IRS notice or in specific published guidance. The IRS uses information reported on Forms W-2 and other records to identify employees who may have inadequate withholding. If the IRS determines that an employee’s withholding needs to be increased, it may send you a “lock-in letter” specifying the filing status and adjustments that must be used. Before these instructions take effect, the employee receives a separate notice and an opportunity to dispute the determination with the IRS. Once the lock-in instructions take effect, you generally must disregard a Form W-4 that would reduce withholding below the IRS-mandated amount. However, you must honor a new form that results in more withholding. If your business accepts Forms W-4 electronically, its system must prevent an employee subject to a lock-in letter from reducing withholding below the locked-in amount. An employee who disagrees with a lock-in determination must work directly with the IRS. The employee may submit a new Form W-4 and supporting information to the address provided in the IRS notice. Don’t reduce withholding unless the IRS authorizes the change. Businesses that fail to follow lock-in instructions may be liable for the additional tax that should have been withheld. **Establishing consistent procedures** Your payroll procedures should explain how Forms W-4 are submitted, reviewed, and retained. Train payroll personnel to recognize altered or unauthorized forms, but don’t ask them to evaluate whether an employee has calculated the proper amount of withholding. That determination generally belongs to the employee and, when necessary, the IRS. For questions about completing Form W-4, direct employees to the IRS Tax Withholding Estimator or suggest consulting their personal tax advisors. Avoid giving individualized tax advice unless your business is qualified and authorized to provide it. **Know when to seek assistance** Unusual Forms W-4 and IRS lock-in letters can create compliance risks if they aren’t handled correctly. We can guide you through the withholding rules to help reduce the risk of costly errors. Contact us for assistance evaluating your payroll procedures, responding to an invalid form, or complying with an IRS lock-in letter. **For more information on the above article or any [accounting & outsourcing services](https://machen.cpa/services/accounting-outsourcing/), contact Amber Cochran Saxon at (334) 321-4729 or by leaving us a message below.**   Topics: [Payroll, HR & Benefits](https://info.machen.cpa/blog/topic/payroll-hr-benefits) Search this site on Google Search Google ### Recent Posts ### Subscribe to Blog ### Posts by Category - [Business Tax (356)](https://info.machen.cpa/blog/topic/business-tax) - [Business Advisory (238)](https://info.machen.cpa/blog/topic/business-advisory) - [Payroll, HR & Benefits (124)](https://info.machen.cpa/blog/topic/payroll-hr-benefits) - [Audit & Assurance (113)](https://info.machen.cpa/blog/topic/audit-assurance) - [Accounting & Outsourcing (81)](https://info.machen.cpa/blog/topic/accounting-outsourcing) - [Individual Tax (75)](https://info.machen.cpa/blog/topic/individual-tax) - [Tax Planning (33)](https://info.machen.cpa/blog/topic/tax-planning) - [Tax Updates (25)](https://info.machen.cpa/blog/topic/tax-updates) - [Retirement & Wealth Management Planning (18)](https://info.machen.cpa/blog/topic/retirement-wealth-management-planning) - [Taxation (15)](https://info.machen.cpa/blog/topic/taxation) - [Alerts (13)](https://info.machen.cpa/blog/topic/alerts) - [Business Valuation (11)](https://info.machen.cpa/blog/topic/business-valuation) - [News & Events (11)](https://info.machen.cpa/blog/topic/news-events) - [Tax News (11)](https://info.machen.cpa/blog/topic/tax-news) - [Individual Tax Planning (10)](https://info.machen.cpa/blog/topic/individual-tax-planning) - [Not For Profit (10)](https://info.machen.cpa/blog/topic/not-for-profit) - [Retirement Planning (9)](https://info.machen.cpa/blog/topic/retirement-planning) - [Estate Planning (8)](https://info.machen.cpa/blog/topic/estate-planning) - [Manufacturing Industry Insights (7)](https://info.machen.cpa/blog/topic/manufacturing-industry-insights) - [Individuals (1)](https://info.machen.cpa/blog/topic/individuals) - [Insider (1)](https://info.machen.cpa/blog/topic/insider) - [Professional Standard News (1)](https://info.machen.cpa/blog/topic/professional-standard-news) see all [![Returning\_Value](https://info.machen.cpa/hs-fs/file-2504250850-jpg/Machen-Blog-Image/Returning_Value.jpg)](http://machenmcchesney.com/about-us/mission-and-values/) - [![AICPA](https://machenmcchesney.com/img/logos/aicpa.jpg)](https://www.aicpa-cima.com/) - [![NACVA](https://machenmcchesney.com/img/logos/nacva.jpg)](http://www.nacva.com/) - ![2026 INSIDE Public Accounting Top 400](https://machenmcchesney.com/img/2026-ipa-top-400.jpg) - ![2026 Best of Auburn-Opelika](https://machenmcchesney.com/img/2026-best-of-auburn-opelika.jpg) - [![2025 Best of OA](https://machenmcchesney.com/img/2025-best-of-oa.jpg)](https://oanow.com/exclusive/readerschoice/ballot-2025/) - ![2026 Best of OA Winner](https://machenmcchesney.com/img/2026-best-of-oa-winner.jpg) - [![2025 Accounting Today Regional Leaders](https://machenmcchesney.com/img/2025-accounting-today-regional-leaders.jpg)](https://www.accountingtoday.com/) - [![ClearlyRated Best of Accounting](https://machenmcchesney.com/img/2024-best-of-accounting.jpg)](https://www.clearlyrated.com/accounting) - [![ClearlyRated Best of Accounting Employee](https://machenmcchesney.com/img/2024-best-of-accounting-employee.jpg)](https://www.clearlyrated.com/accounting) 1820 East University Drive, Auburn, AL 36830 | Tel: (334) 887-7022 | Fax: (334) 887-7221 1761 Taliaferro Trail, Montgomery, AL 36117 | Tel: (334) 244-8900 | Fax: (334) 364-0927 † This is not a CPA firm. \* Assurance, attest, and audit services provided by Frazier & Deeter, LLC. “Frazier & Deeter” is the brand name under which Frazier & Deeter, LLC\* and Frazier & Deeter Advisory, LLC† and its subsidiary entities provide professional services. 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