Understanding Reciprocal Tax Agreements: Which States Have Them?
5/14/2026
A reciprocal tax agreement is a bilateral arrangement between two states under which an employee who lives in one state and works in the other is subject to income tax only in their state of residence. For employers in metropolitan areas that straddle state lines, reciprocity is the difference between a simple withholding setup and a genuinely complicated one.
It is also the single most common source of a specific, avoidable state assessment — because reciprocity does not apply automatically, and the paperwork that activates it is frequently never collected.
What Reciprocity Actually Does
Without an agreement, the default rule is that the work state taxes income earned within its borders, and the residence state taxes its residents on all income. The employee is generally protected from true double taxation by a resident-state credit for taxes paid to the work state, but that credit is claimed on their personal return — it does not relieve the employer of dual withholding in the meantime.
With a reciprocal agreement in place and the correct certificate on file:
- The employer withholds residence-state income tax only
- No work-state income tax is withheld
- The employee files one state return instead of two
- The employer files in the residence state for that employee
The employee benefit is real and immediate: no overwithholding, no waiting until filing season to recover money through a credit, and no non-resident return to prepare.
The Certificate Is the Whole Mechanism
This is the point on which employers most often fail an examination.
Reciprocity is not self-executing. The employee must affirmatively file the work state's non-residency certificate with the employer. The form is issued by the work state — the state that is giving up its claim — and it declares that the employee is a resident of the reciprocal state and requests exemption from work-state withholding.
Until that certificate is in your hands, work-state withholding is legally owed, even though a reciprocal agreement exists on paper and even though both you and the employee know it applies.
Practical requirements:
- Collect the certificate before the first payroll, as part of the new-hire packet for anyone whose residence and work states differ
- Keep it on file for the retention period, alongside the Form W-4 and state withholding certificate
- Re-solicit when required. Some states require annual renewal; others treat the certificate as effective until revoked. Know which applies for each state you operate in.
- Re-solicit on any change of residence. A certificate declaring residence in State A is void when the employee moves to State C.
- Do not accept a substitute. A verbal assurance, an email, or the employee's Form W-4 is not the certificate.
If a certificate is missing, the correct action is to withhold for the work state until it arrives — not to apply reciprocity on the assumption that the paperwork will follow. Employees often resist this, which is why explaining the requirement at onboarding is easier than explaining the correction later.
Our Multi-State Taxation training covers the certificate mechanics, and Multi-State Payroll Tax Compliance covers the operational setup.
Which States Have Agreements
Reciprocity is concentrated in the Midwest, the Mid-Atlantic, and around the District of Columbia — regions where commuting across a state line is routine. Agreements exist in clusters rather than uniformly, and they are bilateral and specific: a state may have agreements with three neighbors and none with a fourth.
Because the agreements are amended, added, and occasionally terminated by legislation or administrative action, the reliable approach is to verify each pair of states rather than working from a remembered list. For any employee whose residence and work states differ, confirm three things with the two states' revenue agencies:
- Does an agreement exist between these two specific states? Not "does this state have reciprocity generally."
- Which form is the non-residency certificate, and is it required annually?
- Does the agreement cover this employee's situation? Some agreements are limited by circumstance.
One asymmetry worth knowing: a few arrangements are not truly mutual. A state may exempt residents of a neighboring state without that neighbor extending the same treatment. Verify the direction that applies to your employee, not just the existence of an arrangement.
What Reciprocity Does Not Cover
Employers regularly over-apply reciprocity by assuming it resolves everything about the multi-state relationship. It generally does not.
Unemployment insurance is unaffected. SUI localization follows its own four-part test — localization of service, then base of operations, then place of direction and control, then employee residence — and reports to one state regardless of any income tax agreement. An employee can be withheld for the residence state under reciprocity while their unemployment wages are reported to the work state.
Local taxes are usually excluded. Municipal, county, school district, and transit taxes are frequently outside the agreement's scope. An employee exempt from a state's income tax withholding under reciprocity may still owe that state's city tax on wages earned there — a genuinely counterintuitive result and a common finding.
Disability and paid family leave programs are typically separate. Where the work state operates an SDI or PFML program, contributions may still be required.
Other work states are not covered. Reciprocity between two states says nothing about a third. An employee living in State A, working primarily in State B under reciprocity, who also works ten days in State C, has a State C question governed entirely by State C's rules.
Non-wage income is outside the scope. Agreements generally address compensation for personal services, not rental income, business income, or gains.
The Situations That Cause Problems
The employee who moves. A new residence can create reciprocity where none existed, destroy it where it did, or require a new certificate. Any address change crossing a state line should trigger a review, not just a mailing update.
The hybrid employee. An employee who lives in State A and splits time between an office in State B and home has a more complex analysis. Work performed at home is performed in the residence state; work performed at the office is performed in State B. Reciprocity may make the distinction moot for income tax while leaving allocation relevant for other purposes.
The employee with two work states. Reciprocity with one does not extend to the other. Both must be analyzed.
The employee who never files the certificate. Withhold for the work state. Document that you requested the certificate and when — that record is what demonstrates reasonable diligence.
The employee who files the certificate late. Generally you begin residence-state-only withholding prospectively from receipt. Retroactively unwinding prior work-state withholding is usually the employee's matter to resolve on their returns, not a payroll correction, though this varies by state.
Explaining It to the Employee
Reciprocity generates predictable employee questions, and answering them well prevents most of the friction.
"Why is my state tax withholding going up?" Because reciprocity has not been activated. Until the non-residency certificate is on file, the work state's tax is legally owed. Frame the certificate as the action that fixes it rather than as paperwork.
"Can you just start withholding for my home state now and I'll send the form later?" No. The certificate is the legal basis for suppressing work-state withholding, and applying reciprocity without it exposes the employer to the work state's assessment. The employee is not harmed by the delay — they recover the difference through their resident-state credit or refund.
"Why am I still paying a city tax in the state I don't pay income tax to?" Because state reciprocity generally does not reach local taxes. This is the question employees find hardest to accept, and it is genuinely counterintuitive.
"I moved. Does my certificate still work?" No. A certificate declaring residence in one state is void once the employee lives somewhere else, and a new analysis is required — the new pair of states may have no agreement at all.
Handling these at onboarding, in writing, is substantially cheaper than handling them after a paycheck lands differently than the employee expected.
What This Means for Payroll Setup
Reciprocity is not a checkbox; it is a configuration with dependencies:
- The employee's work state and residence state must both be recorded accurately, and the work state must reflect where work is actually performed rather than a default office assignment
- The system must be able to suppress work-state income tax withholding while continuing work-state SUI, SDI, PFML, and local tax where applicable
- The certificate's presence, date, and expiration should be tracked as data, not filed and forgotten
- Year-end reporting must reflect the correct state on the Form W-2 — a mismatch between the withholding state and the reported state generates employee filing problems and state notices
Our Payroll Reporting Training & Certification Program covers the year-end reporting side, and Payroll Reconciliation And Reporting covers the tie-out.
Cross-Border Employees Beyond State Lines
Reciprocity is a domestic concept. For employees working across international borders, the analogous mechanisms are income tax treaties — which allocate taxing rights between countries — and totalization agreements, which prevent duplicate social security taxation. These operate differently, require different documentation, and interact with permanent establishment risk and local labor law.
If an employee is working from another country, the analysis is not a harder version of a state question. See our inpat and expat payroll rules page, the Payroll Rules For Inpat & Expat Payroll session, and IRS rules for work visas for the inbound counterpart.
A Reciprocity Control Checklist
- [ ] Identify every employee whose residence state differs from their work state
- [ ] For each pair, verify with both states whether an agreement exists and in which direction
- [ ] Collect the work state's non-residency certificate before the first payroll
- [ ] Record the certificate date and any renewal requirement as tracked data
- [ ] Confirm the system suppresses work-state income tax but continues SUI, SDI, PFML, and local tax as required
- [ ] Determine SUI localization separately using the four-part test
- [ ] Check whether any local tax in the work state survives the agreement
- [ ] Re-verify on every address change and at each annual renewal
- [ ] Confirm Form W-2 state reporting matches the withholding actually performed
Frequently Asked Questions
What is a reciprocal tax agreement?
A bilateral agreement between two states under which an employee who lives in one and works in the other is subject to income tax only in their state of residence. The employer withholds residence-state tax only, the employee files a single state return, and no non-resident work-state return is required. Agreements are specific to each pair of states rather than general to a state.
How do you claim reciprocity for an employee?
The employee must file the work state's non-residency certificate with the employer — the form issued by the state giving up its claim. Until that certificate is on file, work-state withholding is legally owed even if an agreement exists. Some states require annual renewal; all require a new certificate when the employee changes residence.
What happens if the employee does not file the non-residency certificate?
Withhold for the work state. Reciprocity does not apply on the strength of the parties' knowledge that it should — the certificate is the operative document. Document that you requested it and when, since that record demonstrates reasonable diligence if the arrangement is later examined.
Does reciprocity cover unemployment insurance?
No. Unemployment insurance localization follows its own four-part test and reports to one state regardless of any income tax agreement. It is entirely possible to withhold income tax for the residence state under reciprocity while reporting unemployment wages to the work state, and doing so is correct rather than inconsistent.
Does reciprocity cover local city taxes?
Usually not. Municipal, county, school district, and transit taxes are frequently outside the scope of a state-level agreement, so an employee exempt from state income tax withholding under reciprocity may still owe the work state's city tax on wages earned there. This is a common examination finding precisely because the result is counterintuitive.
Which states have reciprocal tax agreements?
Agreements cluster in the Midwest, the Mid-Atlantic, and around the District of Columbia, where cross-border commuting is routine — but they are bilateral and specific, so a state may have agreements with some neighbors and none with others. A few arrangements are not mutual, exempting one state's residents without reciprocal treatment. Because agreements are added, amended, and occasionally terminated, verify the specific pair of states with both revenue agencies rather than relying on a remembered list.
Going Deeper
Reciprocal agreements and their certificate requirements change through legislation and administrative action. Verify the current status of any specific state pair with both revenue agencies before configuring withholding.
