Why Remote Work Creates State Tax Risk for Law Firms
Remote work and multi-state clients have quietly turned state taxes into one of the biggest blind spots for growing law firms.
On the surface, it feels simple.
Your main office is in one state, you file there, and your CPA “handles the rest.”
In reality, once you have attorneys, staff, or clients across state lines, things get complicated fast.
Once you have people working remotely, partners living in different states, or clients spread across several jurisdictions, your firm may be dealing with:
State income or franchise tax nexus in more places than you realize
Filing in multiple states for the firm, and sometimes for the partners too
Apportionment rules that decide how much of your profit each state gets to tax
Partner tax obligations and withholding on multi-state K-1 income
For entrepreneurial firms with remote attorneys and distributed clients, multi-state compliance is not a fringe issue anymore.
It is the norm.
Why Lawyers Should Care About Multi-State Tax
From a law firm owner’s perspective, multi-state tax issues usually show up as:
Surprise tax notices from states you did not know you were connected to
Double-tax risk when income gets pulled into more than one state
Penalties and interest for missed registrations, filings, or nonresident withholding
Frustrated partners getting K-1s that mention states they never expected
Admin headaches from trying to fix years of “we’ll deal with that later”
The biggest driver is remote work and virtual firm growth.
If you hired an associate in another state, allowed a partner to move, or started serving business clients across state lines, you may have created obligations beyond your home state.
Many law firm owners assume this is something their CPA will automatically catch.
Sometimes they do. Sometimes they do not.
That gap is where expensive problems start.
Where Multi-State Trouble Starts: Nexus 101 for Law Firms
“Nexus” is the threshold for when a state can tax your firm or require filings.
Historically, nexus was mostly about physical presence, such as an office, employees, or regular in-state operations.
That still matters a lot.
In fact, one remote employee working from home in another state can be enough to create state tax and payroll obligations in many cases.
For law firms, nexus is often triggered by:
Remote attorneys or staff physically working in a state, even from home
Partners living in a state different from the main office
Ongoing work for clients in a state
Revenue thresholds under economic nexus or bright-line tests in some states
A practical reality for law firm owners: service businesses do not get one simple nationwide rule. States vary. A lot.
Some care heavily about physical presence.
Others focus more on where the benefit of the legal service is received.
Some do both.
Action Checklist: Nexus
List every state where any attorney or staff physically works
List every state where you have significant or recurring clients
Confirm whether your firm is registered there for business, income or franchise tax, payroll withholding, and unemployment if needed
Flag any state where you have people or meaningful revenue but no registrations in place
Filing in Multiple States: When One Firm Needs Many Returns
Once nexus exists, a state usually expects more than a casual acknowledgment.
For a pass-through law firm, such as a partnership, multi-member LLC, or S corp, multi-state filing can involve:
Firm-level returns in each nexus state
Owner or partner returns where income is sourced
Composite returns or nonresident withholding for out-of-state owners
This is where many firms get messy.
Common pain points include:
The firm files only in the home state, while partners quietly file elsewhere
No one has mapped which states require withholding on nonresident owners
Partners handle filings inconsistently, which increases risk and causes internal tension
The firm assumes that if the partners handle their own filings, the firm does not need to do anything else
That assumption can get expensive.
Action Checklist: Multi-State Filings
Pull the last 1 to 2 years of firm state tax returns
Compare them to where your people and clients actually are
Identify states where the firm may have nexus but no return is being filed
Ask your tax advisor for a state-by-state filing map that answers:
Do we have nexus?
Does the firm file there?
Is a composite return available?
Are we required to withhold for nonresident owners?
State Apportionment: How States Decide What Share of Your Profit They Tax
If you file in more than one state, the next question is how much profit each state gets to tax. That is apportionment.
States use different formulas, often based on some mix of:
Payroll, or where your people are
Property, or where your office and equipment are
Sales or receipts, often tied to where the client receives the benefit of the service
This matters more than most law firm owners realize.
Two firms with the same total profit can owe very different amounts of state tax depending on where their attorneys sit, where their clients are, and how their revenue is sourced.
Many states now use market-based sourcing for services.
In plain English, that often means a state may look at where the client receives the benefit of your legal work, not just where your attorneys performed it.
So if your systems do not clearly track client state, attorney location, and revenue by matter, your apportionment can become inaccurate fast.
That can mean:
Overpaying in one state
Underpaying in another
Creating audit exposure
Making year-end tax planning much harder than it needs to be.
Action Checklist: Apportionment
Confirm which formula your key states use
Make sure your accounting and practice management systems track client state and work location
Ask your advisor to model how your tax bill changes if a partner moves or a new office opens
Review whether related entities create additional state tax complexity
Partner Tax Problems: K-1s, Withholding, and Awkward April Conversations
Multi-state complexity often lands hardest on partners.
For partnerships and multi-member LLCs, states usually care about:
A nonresident partner’s share of in-state income
Whether the firm withholds on that income
Whether the firm files a composite return on the partner’s behalf
This is where the awkward April conversations begin.
Partners may receive K-1s showing income in multiple states, but with little guidance on what to file.
Some may comply quickly.
Others may ignore it.
That inconsistency creates risk for both the individual and the firm.
It gets even messier when partners live in different states from the office.
Residency, nonresident filings, credits for taxes paid to other states, and withholding thresholds can all come into play.
Problems usually show up as:
Partners getting K-1s with multi-state income and no clear filing instructions
States sending notices directly to partners
Partners feeling blindsided by tax bills tied to states they barely think about
Internal tension between partners who stay ahead of compliance and partners who fall behind
Action Checklist: Partner Taxes
Map each partner’s state of residence
Identify where each partner regularly works
Review where their client base is concentrated
Decide, state by state, whether the firm will use withholding, composite returns, or both
Give partners written instructions with their K-1s each year
Build a Practical Multi-State Compliance Playbook 🧩
You do not need a 100-page SALT memo to get control of this. You need a repeatable system.
1. Inventory your footprint
Track:
Where every attorney and staff member actually works
Which states drive meaningful revenue
Which entities are involved in the firm structure
2. Set registration rules
Create internal rules for when the firm registers in a new state, such as:
First remote hire
First partner relocation
First significant recurring client
Certain revenue thresholds
3. Standardize remote-work onboarding
Before approving a remote employee or partner move, run a checklist:
Do we need entity registration?
Do we need payroll withholding and unemployment accounts?
Are there city or local business taxes?
4. Fix your data systems
Make these required fields:
Client state
Attorney work state
Revenue by matter or billing source
Good state tax compliance starts with better data, not just better tax prep.
5. Review annually
At least once a year, sit down with a SALT-aware advisor and review:
Nexus exposure
Apportionment assumptions
Nonresident withholding and composite return strategy
Partner communication
6. Communicate clearly with partners
Share a simple memo each year that explains:
Which states the firm is filing in
Where withholding or composite filings are happening
What personal filing obligations partners should expect
Final Thought
For many law firm owners, the real win is not just reducing tax risk.
It is getting your mental bandwidth back.
When you know which states matter, how income is being sourced, and what partners should expect, multi-state tax stops being a constant background stressor.
It becomes a system you can manage like any other part of a well-run firm.
That is the goal.
