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Part-Year Resident Returns

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Part-Year Resident Returns

The U.S. tax system is multifaceted, encompassing various scenarios that individuals may encounter throughout their lives. One such scenario is the requirement to file part-year resident tax returns, which applies to those who have changed their state or country of residence during the tax year. This situation often arises from relocating for a new job, retirement, education, or other personal reasons, making it essential to understand the specific tax obligations that come with part-year residency.

Part-year resident tax returns involve reporting income earned during periods when an individual was a resident and non-resident within a particular state or the United States. This process ensures that individuals meet their tax responsibilities fairly and accurately, reflecting the time spent and income earned in each jurisdiction. The regulations governing part-year residency are complex, requiring a thorough understanding of both federal and state laws to ensure compliance.

The Internal Revenue Code (IRC) and state-specific tax codes provide the framework for determining tax residency and the appropriate allocation of income. The IRC outlines federal tax obligations, including the taxation of worldwide income for U.S. residents and U.S. source income for non-residents. States with income tax systems have their own rules and forms for part-year residents, which must be adhered to in conjunction with federal requirements​.

Filing part-year resident returns can be a daunting task, involving multiple steps such as determining residency periods, allocating income accurately and completing various federal and state tax forms. Errors or omissions can result in significant penalties and interest, underscoring the importance of meticulous preparation and filing​.

What Are Part-Year Resident Returns?

Part-year resident returns apply to individuals who have been residents of a state or the U.S. for only part of the tax year. This status usually arises from moving into or out of a state or the U.S. during the year. Such individuals must report income for the portion of the year they were residents and non-residents.

Part-year residents must file tax returns with both the state they moved from and the state they moved to if both states have an income tax. They must also adhere to federal tax obligations, which include reporting worldwide income while a resident and U.S. source income while a non-resident​​.

Legal Framework

Part-year residency tax regulations are governed by both federal and state laws:

  • Internal Revenue Code (IRC): Federal tax laws for part-year residents and dual-status aliens are outlined in the IRC, particularly concerning the determination of tax residency and reporting requirements​​.
  • State Laws: Each state with an income tax has its own rules for part-year residents, which can vary significantly. States generally require part-year residents to file Form 1040 or equivalent state forms and provide guidelines on income allocation​​.


Individuals who have changed their state of residence or U.S. residency status during the tax year are required to file part-year resident returns. This includes:

  • Individuals Moving Between States: Those who relocate to a new state during the year must file part-year resident tax returns in both the origin and destination states.

  • International Arrivals and Departures: Foreign nationals who become U.S. residents or U.S. residents who leave the country partway through the year must also file part-year resident returns​​.

Process Steps for Part-Year Resident Returns

Filing part-year resident tax returns involves several detailed steps that ensure accurate reporting and compliance with both federal and state tax laws. Here is an in-depth look at each step involved in the process:

1. Determination of Residency Status

The first step is to accurately determine the residency status for the tax year. This involves identifying the exact dates when residency began and ended in each state or the U.S. This is crucial because tax obligations differ significantly for periods of residency and non-residency.

  • Federal Guidelines: According to the IRS, a person is considered a U.S. resident if they meet the substantial presence test or hold a green card. For part-year residency, individuals need to establish the dates they were residents and non-residents​.

  • State Guidelines: Each state has its own criteria for determining residency. Common factors include the physical presence in the state, domicile (permanent home), and intent to remain or return to the state.

2. Documentation

Collecting all relevant documentation for the tax year is essential. This includes:

  • Income Statements: W-2s, 1099s and other income documents covering the entire year.

  • Relocation Records: Moving expenses, dates of relocation and any temporary housing arrangements.

  • State-Specific Forms: Each state has its forms and requirements for part-year residents.

3. Allocation of Income

Income must be divided accurately between the periods of residency and non-residency. This step involves:

  • Identifying Sources of Income: Determine which income was earned while a resident and which was earned while a non-resident. U.S. residents are taxed on worldwide income, while non-residents are taxed only on U.S. source income​.

  • Using Allocation Methods: States may provide specific methods for income allocation. Common approaches include time-based allocation (e.g., dividing income based on the number of days spent in each state) or transaction-based allocation (e.g., attributing specific income to periods of residency).

4. Completing Federal Returns

Federal returns for part-year residents typically require the use of Form 1040, along with additional schedules and forms:

  • Form 1040: The primary form for individual income tax returns.
  • Schedule NR: For reporting non-resident income, if applicable.
  • Publication 519: Provides detailed instructions and examples for dual-status aliens and part-year residents​​.

5. Completing State Returns

Each state where residency was held during the year requires a separate return, typically involving:

  • State Part-Year Resident Forms: Each state has a specific form for part-year residents. For example, California uses Form 540NR, and New York uses IT-203.

  • Income Allocation Worksheets: States often provide worksheets or schedules to assist with the accurate allocation of income between residency periods.

6. Calculation of Taxes

Accurate tax calculation involves:

  • State Tax Rates and Deductions: Apply the appropriate state tax rates and deductions for the periods of residency.

  • Federal Tax Calculation: Use the federal tax tables and applicable credits or deductions. Note that dual-status taxpayers cannot use the standard deduction and must itemize deductions instead​​.

7. Filing Returns

Once all forms are completed and taxes are calculated, the final step is to file the returns:

  • Federal Filing: Submitting Form 1040 and any supporting documents to the IRS. This can be done electronically or via mail.
  • State Filing: Filing part-year resident returns with each state’s tax authority. It should be ensured that all supporting documents and worksheets are included.

  • Deadlines: Federal returns are typically due by April 15th, while state deadlines may vary.

Key Takeaways

  • Understanding Residency: It is crucial to determine residency periods accurately to ensure proper tax filing.

  • Compliance with Laws: Adherence to both federal and state tax laws is essential to avoid penalties and interest.

  • Professional Assistance: Engaging professional services can simplify the complex process and ensure accurate, compliant returns.

Services Provided by Dimov Tax & CPA Services

Dimov Tax & CPA Services offers a comprehensive range of services to assist clients with part-year resident tax returns:

  • Residency Determination: Expert guidance on determining residency status based on federal and state laws.

  • Income Allocation: Accurate division of income between resident and non-resident periods to ensure correct tax liability.

  • Tax Preparation and Filing: Complete preparation and filing of federal and state tax returns including all necessary forms and schedules.

  • Consultation and Planning: Strategic tax planning to minimize liabilities and optimize deductions for part-year residents.

  • Representation: Professional representation in case of audits or disputes with tax authorities.


Part-year resident tax returns require careful consideration and detailed attention to ensure compliance with all applicable laws. Dimov Tax & CPA Services is committed to providing expert assistance and helping clients with these complexities efficiently. By understanding the regulations and following the correct steps, part-year residents can manage their tax obligations effectively, ensuring peace of mind and financial stability.

For further assistance, contact Dimov Tax & CPA Services today, and let our team of experienced professionals handle your part-year resident tax needs.

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