Overview

Federal withholding is the mandatory deduction of federal income tax, Social Security, and Medicare from employee wages. For remote employees, the federal portion of withholding follows the same federal rules as on-site staff, but remote work often creates additional state-level obligations that change payroll registration, deposit schedules, and tax reporting.

In my work advising employers on payroll for remote teams, the most common issues I see are (1) missing or outdated W‑4 information, (2) failure to register for withholding in the employee’s work state, and (3) inconsistent tracking of where employees actually perform their duties.

Sources and further reading include the IRS Employer’s Tax Guide (Publication 15) for employer responsibilities and the IRS guidance on Form W‑4 for employee withholding choices (see Resources below) IRS Pub 15 and About Form W‑4.

Why remote work changes the withholding picture

Federal withholding rules remain consistent across physical work locations because they are based on federal tax law, not state residence. However, states set their own income tax rules. A remote employee living and working in State A for an employer based in State B can create a withholding obligation in State A for the employer. That mismatch leads to several employer responsibilities:

  • Register the business for withholding and unemployment tax in the employee’s work state when required.
  • Withhold according to the work state’s rules and remit deposits on that state’s schedule.
  • Report wages and file state returns, including W‑2 reporting for that state.

Different states also have reciprocal agreements that let residents avoid withholding in the employer’s state. Employers must know which states have reciprocity and follow their rules.

For a practical employer checklist on state obligations for remote workers, see our internal guide: State Tax Withholding for Remote Employees: Practical Checklist.

Employer duties: step-by-step

  1. Collect and review Form W‑4 from every employee. The employee’s W‑4 determines federal income tax withholding amounts and must be retained per IRS recordkeeping rules (see About Form W‑4).
  2. Use the current IRS withholding tables, the employer’s payroll software, or the IRS Publication 15 to calculate federal withholding. Annual updates to tax brackets and withholding guidance may alter calculations each year.
  3. Determine state withholding requirements by the employee’s work location. Register with that state’s taxation agency if necessary.
  4. Withhold Social Security (6.2%) and Medicare (1.45%) from the employee’s wages and match those amounts as the employer. Note: there is an additional 0.9% Medicare surtax on employee wages above the threshold (no employer match) — see IRS guidance for thresholds.
  5. Make federal employment tax deposits (income tax withheld plus employer and employee payroll taxes) according to IRS deposit schedules.
  6. Report wages and taxes on Form W‑2 at year-end, including state wage and withholding information for each relevant state.

Common remote-work scenarios and how to handle them

  • Employee lives and works in the same state where the employer is located: Treat withholding the same as a traditional employee—register and withhold in that state.
  • Employee works in a different U.S. state than the employer: Investigate that state’s registration and withholding rules. Some states require immediate registration; others have thresholds.
  • Employee teleworks from multiple states: Track time worked in each state. When significant, you may need to register and withhold in multiple states. Our guide on multi-state moves explains how employers handle mobility: Handling Multi-State Payroll Withholding After an Employee Move.
  • Employee is in a reciprocal agreement state: Follow the agreement to determine where withholding should occur.

Employee actions and best practices

  • Complete an accurate Form W‑4 and update it after major life changes (marriage, new dependents, filing status changes). Encourage updates at least annually or when income changes materially. See IRS Form W‑4 guidance for specifics.
  • Use the IRS Tax Withholding Estimator to check whether current withholding will cover expected tax liability for the year.
  • Keep a record of your work locations and dates. If you split time across states, this documentation helps employers and tax advisors determine withholding and filing needs.

For a clear explanation of how withholding works and how to adjust a W‑4, see: How Withholding Works and How to Adjust Your W‑4.

Practical payroll controls and technology

Payroll complexity grows with remote teams. Employers should consider:

  • Payroll platforms that support multi-state withholding and automatic tax registration for new employee states.
  • Time and location tracking tools integrated with payroll to capture where employees perform work.
  • A schedule for periodic audits of payroll setup, especially after hiring remote employees in new states.
  • Engaging a payroll provider or CPA when the company has workers in many different states.

In my practice, automated payroll paired with an annual compliance audit reduced state registration oversights for small businesses operating remotely.

Mistakes that trigger audits or penalties

  • Failing to register and withhold in the employee’s work state when required.
  • Treating employees as independent contractors incorrectly to avoid withholding obligations.
  • Using outdated W‑4 information that under-withholds federal tax, resulting in employee tax bills and potential penalties.
  • Inaccurate time/location records when an employee splits work between states, which creates ambiguity in tax filings.

If the IRS or a state tax agency finds withholding errors, the employer can face deposit penalties, interest, and potential payroll tax assessments. Prompt corrective action and voluntary disclosure programs can sometimes mitigate penalties.

Example case (short)

A New York employer hired a software developer who permanently relocated to Texas. Because Texas has no state income tax, the employer only had to update federal withholding and continue Social Security/Medicare withholding; they also needed to update state unemployment insurance registration in the new state and adjust any state-specific benefits. Contrast that with an employee moving to Pennsylvania, where the employer would generally need to register and withhold Pennsylvania state income tax.

Checklist for employers (actionable steps)

  • Collect a completed Form W‑4 and validate employee address and remote work location.
  • Confirm whether the employee’s work location creates a state withholding or unemployment tax registration requirement.
  • Update payroll system settings and tax registrations before the first payroll run after a location change.
  • Withhold federal income tax, Social Security, and Medicare according to IRS rules.
  • Keep time/location records for employees working in multiple states.
  • Consult a payroll specialist or CPA when you have employees in three or more states.

Resources

Final notes and disclaimer

This article explains general rules about federal withholding and remote work complications as of 2025 and is intended for educational purposes only. Tax law and state rules change; employers and employees should consult a CPA, payroll provider, or state tax agency for advice tailored to their circumstances.