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1099 Contractor in Maryland with a Illinois Client: Where Do You File?

Home state, plus the client state if you work thereNo withholding — 1099

Answer

Maryland always, Illinois sometimes. With no withholding on a 1099 the whole tax is yours to manage: estimate to Maryland through the year, and file a Illinois nonresident return for any income from work you physically performed in Illinois, claiming the credit back on the Maryland return.

Last verified

Reciprocity agreements are the first thing contractors ask about and the first thing that does not apply to them. Every agreement in the country is a wage-withholding arrangement, and a 1099 has no withholding to switch off.

Illinois allows a 30-day safe harbour before the obligation attaches. Illinois does not require an employer to withhold from a nonresident who works in Illinois for 30 or fewer days in the year. The day count is a withholding safe harbour; a nonresident who exceeds it owes Illinois tax on the Illinois-source wages.

What you file

  1. 1Quarterly estimated payments · Maryland

    Make quarterly estimated payments to Comptroller of Maryland on your full self-employment income — nothing is withheld from a 1099.

  2. 2Nonresident return · IllinoisForm IL-1040 with Schedule NR

    File a Illinois nonresident return only if you performed services inside Illinois. Illinois does not require an employer to withhold from a nonresident who works in Illinois for 30 or fewer days in the year. The day count is a withholding safe harbour; a nonresident who exceeds it owes Illinois tax on the Illinois-source wages.

  3. 3Resident return · MarylandForm 502CR

    File the Maryland resident return last and claim the credit for any tax paid to Illinois.

The two states, side by side

 MarylandIllinois
Taxes wagesYes — graduatedYes — flat
Reciprocity partners4 (Form MW507)4 (Form IL-W-5-NR)
Convenience ruleNoNo
Nonresident returnForm 505 with Form 505NRForm IL-1040 with Schedule NR
Credit for other-state taxForm 502CRSchedule CR
Nonresident safe harbourNone published30 days
Local income taxYesNo
Revenue departmentComptroller of MarylandIllinois Department of Revenue
Last verified

The other direction

Reversing the commute does not always reverse the answer. Living in Illinois and working in Maryland gives:Home state, plus the client state if you work there.

Illinois to Maryland →

Same two states, different situation

The withholding answer turns on how you are paid and where the work happens, not only on which two states are involved.

Other Maryland pairs

Questions people actually ask

I live in Maryland and my client is in Illinois. Do I have to file a Illinois tax return?

Maryland always, Illinois sometimes. With no withholding on a 1099 the whole tax is yours to manage: estimate to Maryland through the year, and file a Illinois nonresident return for any income from work you physically performed in Illinois, claiming the credit back on the Maryland return.

Do reciprocity agreements help a 1099 contractor?

No. Every state reciprocity agreement in the country is an arrangement about wage withholding between two revenue departments, and a 1099 has no withholding to switch off. Whether Maryland and Illinois hold an agreement makes no difference to a self-employed filer — sourcing rules decide the answer instead.

How current is this?

The Maryland and Illinois rules on this page were last checked against Comptroller of Maryland and Illinois Department of Revenue on 2026-08-07. We re-check the full grid every December after state legislative sessions close, and re-check the convenience-of-the-employer states quarterly because that is where the rules move fastest.

Sources

Every fact above comes from the revenue department that publishes the rule. We do not cite secondary summaries, and we do not restate a figure we could not find at source.