Multi-State Tax Clients: Extra Documents to Collect
Clients who moved, worked remotely across state lines or own out-of-state property need more than a standard checklist. The extra documents and dates to collect.
Quick answer: For clients with income or residency in more than one state, collect the exact dates of any move, addresses in each state, W-2s showing state wages and withholding for each state, records of where remote work was physically performed, documentation for out-of-state rental property or business activity, any K-1s with state-source income, and prior-year state returns. State rules vary widely, so the goal at the document stage is to capture facts precisely enough to apply each state's rules correctly.
Key takeaways
- Dates matter: exact move dates determine part-year residency periods.
- Check that W-2 state wage boxes match where the work was actually done.
- Remote workers may have income sourced to more than one state.
- Ask about multi-state situations in your intake and every January request.
Situations that trigger multi-state filing
- Moving to a new state during the year
- Living in one state and working in another
- Remote work for an employer in another state
- Rental property in another state
- Partnership or S corporation interests with activity in other states
- Temporary work assignments out of state
Documents and facts to collect
- Move date, old and new addresses
- All W-2s, checking state wage and withholding boxes for each state
- A log or employer statement of days worked in each state, where relevant
- Out-of-state rental income and expense records. See rental property documents.
- K-1s and their state schedules. See late K-1s.
- Prior-year returns for every state. See getting prior-year returns.
- Any state notices
Add it to intake
A single question, "Did you live or work in more than one state this year?", in your intake form catches most cases early. Each state return also affects pricing. See how to price tax returns.
Check W-2s carefully
Employers sometimes report wages to the wrong state after a move or a switch to remote work. Catching it early means the client can ask for a corrected W-2 before you file. Correctdocs checks each upload against what was requested, so a W-2 for the wrong employer or year is caught right away.
Correctdocs is in early access. The first 10 US accounting, bookkeeping and tax firms get a free 30-day pilot on real client requests. Request early access.
Frequently asked questions
Do I need to file in two states if I moved?
Often, yes, as a part-year resident in each, though rules vary by state. Exact move dates are essential.
Do remote workers file in their employer's state?
It depends on the states involved. Collect where work was physically performed and the W-2 state details, then apply each state's rules.