Multistate Tax for Consultants: How Remote Work and Travel Create Nexus

The remote-work explosion created a multistate tax problem for independent consultants. A consultant who lives in Texas (no state income tax) but works for clients in New York, California, and Illinois may owe income tax to those states on the income earned from work performed there, or from clients located there, depending on each state’s rules. The same consultant who occasionally travels to a client’s office in New York for strategy meetings may cross New York’s nonresident filing threshold without realizing it. For consultants operating through an S-Corp or LLC, the entity itself may have nexus in the client’s state, triggering additional filing obligations.

What triggers nexus for a consulting firm?

Physical presence: An employee, owner, or contractor working in the state, even for a single day, can create nexus. For current guidance, see Streamlined Sales Tax Project. A consultant who travels to a client’s Chicago office for a two-day workshop has created nexus in Illinois. Some states have de minimis thresholds (Pennsylvania exempts nonresidents with fewer than 12 days of work in the state), but many do not.

Economic nexus: An increasing number of states assert income tax nexus based on the dollar amount of revenue sourced to the state or the number of transactions, similar to sales tax economic nexus. For example, a consultant who earns $500,000 from a single client in New York has significant New York-source income, even if the consultant never sets foot in New York.

Remote employees: If the consulting firm hires a remote employee who lives and works in another state, the firm has nexus in that state through the employee’s presence. This triggers entity-level filings (franchise tax, income tax) and payroll tax obligations in the employee’s state.

How is consulting income sourced to a state?

States use different rules to determine how much of a consultant’s income is taxable within their borders:

Market-based sourcing (majority rule): Income is sourced to the state where the client receives the benefit of the service. If the client is in California and the consultant performs the work from Texas, the income is California-source under market-based sourcing. This is the rule in most states (California, New York, Illinois, Georgia, and about 30 others).

Cost-of-performance sourcing (minority rule): Income is sourced to the state where the greatest proportion of the costs of performing the service are incurred. If the consultant performs 80% of the work from their home office in Texas, 80% of the income is Texas-source (and not taxable by any other state). This rule applies in a smaller number of states (including Ohio for certain taxes and a few others).

What about the “convenience of the employer” rule?

A few states (New York is the most aggressive) apply a “convenience of the employer” rule: if a nonresident employee works remotely for a New York employer for their own convenience (not because the employer requires it), New York taxes the income as if the employee were physically present in New York. This rule was designed for employees, not independent contractors, but the principle can affect consultants who work for New York-based clients.

For independent consultants (not employees), the convenience rule does not directly apply. But New York’s market-based sourcing achieves a similar result: income from New York clients is New York-source regardless of where the work is performed.

How do credits prevent double taxation?

When a consultant owes income tax to multiple states on the same income, the home state typically provides a credit for taxes paid to other states. This prevents double taxation, but only if the consultant files correctly in all states.

If the consultant lives in a no-income-tax state (Florida, Texas, Wyoming, etc.), there is no home-state credit to claim, and the tax paid to client states is the final cost. The consultant cannot recover the state tax paid to New York or California by crediting it against a non-existent home-state tax.

For consultants living in income-tax states, the credit is limited to the lesser of (a) the tax actually paid to the other state or (b) the home state’s tax on the same income. If the consultant’s home state has a lower rate than the client’s state, the consultant pays the higher rate on the sourced income (the credit covers the home-state tax, but the excess paid to the client state is not refunded).

What filing obligations does the entity have?

An S-Corp or LLC with nexus in another state typically must:

1. Register as a foreign entity with the state’s secretary of state
2. File an entity-level tax return in that state (Form 1120-S equivalent)
3. Pay any minimum taxes or franchise taxes (California’s $800, New York’s fixed-dollar tax)
4. Withhold and remit estimated tax on the nonresident owner’s share of income sourced to the state (many states require this)
5. Include the state information on the owner’s K-1

For a consultant with clients in many states, the compliance burden can be significant. A practical approach: file in states where the income exceeds a materiality threshold ($10,000-$25,000) and where the state has aggressive enforcement. States with no income tax (Texas, Florida, Wyoming, Nevada, Tennessee, South Dakota, Washington, New Hampshire for wage income, Alaska) require no income tax filing.

Related guides:

• Consulting Employee Vs Contractor Classification
• Consulting Entity Structure Llc Scorp Sstb
• Consulting Firm Tax Deductions Expenses
• Consulting Home Office Deduction Remote
• Consulting Insurance Deductions Eo Liability

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.