Overview

Remote work has permanently changed where many Americans earn income. That shift increases the chance you’ll have tax obligations in more than one state. States use different residency tests, sourcing rules, and employer-reporting standards; the result is complexity and, sometimes, unexpected tax bills.

This article explains how multi-state income is taxed, common state rules and traps, practical planning steps, recordkeeping best practices, and real-world examples you can use when meeting with a CPA, tax attorney, or financial planner. Sources used include the IRS guidance on state and local taxes (irs.gov) and state tax departments; always confirm rules with a tax professional and the state revenue agency for the states involved.

Why this matters now

Since 2020 many employers relaxed office requirements and employees moved away from their employer’s state. States responded with a mix of updates — some clarifying telework sourcing, others enforcing long-standing rules (for example, New York’s “convenience of the employer” doctrine). That means your day-to-day work location can change your tax picture even when your employer’s payroll stays in the same state.

In my practice I’ve seen clients who assumed moving to a no‑income‑tax state eliminated state tax bills — only to discover they owed taxes to the employer’s state because of sourcing rules or insufficient documentation of residency. Good planning prevents those surprises.

Key rules that determine state tax obligations

  • Residency: States typically tax residents on worldwide income. “Resident” is defined differently across states — some use physical presence (number of days), others look at domicile (your permanent home) and ties (voter registration, driver’s license, family location). See our guide to State residency tests for more detail (FinHelp: State Residency Tests).

  • Nonresident sourcing: States tax nonresidents on income that is “sourced” to that state — usually the income earned for work performed physically inside the state or services performed for clients located there. If you telework into an employer in another state, that employer’s state may still claim some or all of the wage income as state‑sourced.

  • Credits for taxes paid to another state: Most states give a credit to residents for taxes paid to other states to avoid double taxation, but those credits require you to file and claim them and they follow state‑specific rules.

  • Reciprocal agreements: Neighboring states sometimes have reciprocal agreements (e.g., Pennsylvania has reciprocity with some states) so cross‑border employees file only in their home state. These agreements are limited — check the involved states’ tax websites to confirm.

  • Employer withholding and reporting: Employers often withhold based on the employee’s reported state of residence or the employer’s location. If withholding does not match where taxes are ultimately owed, you can end up owing when you file.

  • Special doctrines: Some states apply special sourcing rules. New York’s “convenience of the employer” rule is a common example: if you work remotely for your convenience rather than the employer’s necessity, New York may tax that income as New York‑sourced even if you work outside New York. Always check the state guidance (New York Department of Taxation and Finance).

Who is most likely affected

  • Employees who live in a different state than their employer’s headquarters or payroll location.
  • Freelancers and independent contractors with clients in multiple states.
  • Digital nomads who spend short periods working across several states.
  • Employers with remote staff who need to manage withholding, unemployment insurance, and state payroll registration.

Real‑world examples (illustrative)

1) Employee moves from New Jersey (resident) to Florida (no state income tax) but keeps a New York City employer: New York may still tax wages if it considers them NY‑sourced (depending on the convenience rule and where work is performed). Florida won’t tax wages, but you may still need to file a New York nonresident return and claim credits where allowed.

2) Freelancer based in Vermont works on a consulting engagement for a Massachusetts client and performs some work in Massachusetts during visits: Massachusetts will tax income sourced to it (work done there), and Vermont will tax worldwide income as your resident state — Vermont should give a credit for taxes paid to Massachusetts when you file.

3) Digital nomad works for a California company while living in Texas: Texas has no state income tax, but California may tax income sourced to the state if the work is performed for a California employer and state sourcing rules apply.

Practical tax‑planning steps

  1. Track days and locations: Keep contemporaneous daily logs of where you perform work (city and state). This is the single most persuasive evidence in residency and sourcing disputes.

  2. Clarify domicile vs. residence: If you moved, document actions showing intent to change domicile (lease start date, home purchase, new driver’s license, voter registration, utility bills). Domicile matters more than short visits.

  3. Review employer payroll setup: Ensure HR and payroll know your correct state of residence. Ask them to adjust withholding and state tax forms (e.g., submit the correct state withholding certificate). If the employer refuses, you may still need to adjust estimated payments.

  4. Use state credits and file required returns: File resident and nonresident returns as required. Don’t skip a nonresident return because withholding occurred — you may owe additional tax or be eligible for credits.

  5. Consider estimated tax payments: If withholding will not cover multiple states’ liabilities, make quarterly estimated payments to avoid penalties.

  6. Negotiate a telework policy: If you’re negotiating remote work, include tax handling language (which state’s law governs payroll and who pays for multi‑state tax compliance, if any).

  7. Seek pre‑move tax advice: If you plan to relocate to another state, ask a multi‑state tax advisor about the likely tax consequences before you move.

Recordkeeping checklist

  • Daily work location log (date, hours worked, location)
  • Copies of paystubs showing state withholding
  • Employment agreement and telework policy statements
  • Proof of domicile change (lease, deed, utility bills, driver’s license)
  • State and local tax returns and supporting schedules
  • W‑2s and 1099s separated by payer and state

Common mistakes and how to avoid them

  • Ignoring days worked in other states: Failing to track where work was performed is the most common mistake.
  • Assuming no tax because you live in a no‑tax state: Employer states or client states may still tax income based on sourcing rules.
  • Not timely amending or filing returns: If you realize an error, file and amend promptly to limit interest and penalties. See our article on amending state returns (FinHelp: How to Amend a State Tax Return).

Employer considerations

Employers should register for payroll withholding in any state where they have employees working remotely on a regular basis. Remote hiring can create tax and unemployment insurance nexus. Employers also should update payroll to reflect employee residence and consider offering tax resource support for remote staff.

Where to look for official guidance

Practical checklist to bring to your advisor

  • List of states you lived in and dates
  • Daily work‑location log for the tax year
  • Employer payroll contacts and copies of paystubs
  • Copies of any state correspondence or notices
  • Questions about possible credits, reciprocity, and domicile change

Final tips and common outcomes

  • Many taxpayers avoid surprises by documenting where they live and work, coordinating with employers to set proper withholding, and filing both resident and nonresident returns where required.
  • Some workers reduce state tax exposure by changing domicile to a no‑tax state, but that requires clear, documented permanent ties and intent.
  • For high‑income remote workers or those splitting time across high‑tax states (e.g., New York, California), an advanced multi‑state tax review before making permanent moves will often pay for itself.

Professional disclaimer: This content is educational and not individualized tax, legal, or accounting advice. State tax laws change; confirm current rules with the relevant state revenue departments and a qualified tax advisor.

Authoritative resources

  • IRS — State and Local Tax information: https://www.irs.gov
  • New York Department of Taxation and Finance (convenience of the employer guidance)
  • Your state Department of Revenue or Taxation

If you need targeted help, consult a CPA or state‑tax specialist who understands multi‑state sourcing and residency rules.