# IRS Publication 519: U.S. Tax Guide For Aliens

## What Is IRS Publication 519?

IRS Publication 519 is the U.S. Tax Guide For Aliens, a document the [Internal Revenue Service (IRS)](https://www.investopedia.com/terms/i/irs.asp) publishes that details the tax procedures for aliens, individuals that are not citizens of the United States.﻿﻿ Not all aliens are subject to U.S. taxes. [Resident aliens](https://www.investopedia.com/terms/r/residentalien.asp), those who have been in the country for a defined period, are subject to taxation on their worldwide income just as citizens are. Non-resident aliens are only taxed on income they earn within the U.S., as well as on certain types of international income.﻿﻿

### Key Takeaways

*   IRS Publication 519 provides tax information and guidance for aliens in the U.S.
*   Taxation will depend on whether a person is a resident or non-resident alien, or dual-status.
*   Non-residents may be subject to income tax from both U.S. and foreign authorities.

## Understanding IRS Publication 519

The most important aspect of IRS Publication 519 is its definition of a taxpayer's status as either a non-resident alien or a resident alien using the [substantial presence test](https://www.irs.gov/individuals/international-taxpayers/substantial-presence-test) or the green card test as the applicable tax rules are based on that status. Taxpayers may also be considered as [dual-status aliens](https://www.irs.gov/individuals/international-taxpayers/dual-status-individuals) and should also determine the tax status of any spouse.﻿﻿

The substantial presence test measures residency by physical presence in the U.S. To meet this test, an individual must reside in the U.S. on at least:

1.  31 days during the current year, and
2.  183 days during the three-year period that includes the current year and the two years immediately before that, counting all the days you were present in the current year, one-third of the days you were present in the first year before the current year, and one-sixth of the days you were present in the second year before the current year.﻿﻿

The [green card test](https://www.irs.gov/individuals/international-taxpayers/us-tax-residency-green-card-test) states that an individual is a resident, for U.S. federal tax purposes, if they are a Lawful Permanent Resident of the U.S. at any time during the calendar year. A person becomes a Lawful Permanent Resident if they have been given the privilege, according to the immigration laws, of residing permanently in the U.S. as an immigrant, generally by being issued an alien registration card, also known as a "green card," by the [U.S. Citizenship and Immigration Services](https://www.uscis.gov/about-us).﻿﻿

If an individual qualifies as both resident and non-resident in the same year, they have what is referred to as dual status. A married individual may also have a choice of treating their non-resident spouse as a resident alien.﻿﻿

## Taxation of Non-Resident Income

Individuals determined to be [non-resident aliens](https://www.investopedia.com/terms/n/nonresidentalien.asp) are generally subject to two different tax rates on their U.S. income, one for effectively connected income, and one for fixed or determinable, annual, or periodic (FDAP) income. Effectively connected income is earned from running a U.S. business or performing personal services and is taxed at the same graduated rates as a U.S. citizen. FDAP is considered passive income and is taxed at a flat 30% rate.﻿﻿ Non-resident aliens must file tax returns using Form 1040NR.﻿﻿

For non-resident aliens, tax treaties with foreign countries may reduce or eliminate U.S. tax on various types of personal services and other income, such as pensions, interest, dividends, royalties, and capital gains.﻿﻿

> **Article Sources**
>
> 1.  Internal Revenue Service. "[About Publication 519, U.S. Tax Guide for Aliens](https://www.irs.gov/forms-pubs/about-publication-519)." Accessed Jan. 31, 2020. 
>     
> 2.  Internal Revenue Service. "[Publication 519: U.S. Tax Guide for Aliens](https://www.irs.gov/pub/irs-pdf/p519.pdf)," Pages 10–11. Accessed Jan. 31, 2020.
>     
> 3.  Internal Revenue Service. "[Publication 519: U.S. Tax Guide for Aliens](https://www.irs.gov/pub/irs-pdf/p519.pdf)," Pages 3–4, 7, 9. Accessed Jan. 31, 2020.
>     
> 4.  Internal Revenue Service. "[Publication 519: U.S. Tax Guide for Aliens](https://www.irs.gov/pub/irs-pdf/p519.pdf)," Page 4. Accessed Jan. 31, 2020. 
>     
> 5.  Internal Revenue Service. "[Publication 519: U.S. Tax Guide for Aliens](https://www.irs.gov/pub/irs-pdf/p519.pdf)," Page 3. Accessed Jan. 31, 2020. 
>     
> 6.  Internal Revenue Service. "[Publication 519: U.S. Tax Guide for Aliens](https://www.irs.gov/pub/irs-pdf/p519.pdf)," Pages 7–9. Accessed Jan. 31, 2020.
>     
> 7.  Internal Revenue Service. "[Publication 519: U.S. Tax Guide for Aliens](https://www.irs.gov/pub/irs-pdf/p519.pdf)," Page 20. Accessed Jan. 31, 2020. 
>     
> 8.  Internal Revenue Service. "[About Form 1040-NR, U.S. Nonresident Alien Income Tax Return](https://www.irs.gov/forms-pubs/about-form-1040-nr)." Accessed Jan. 31, 2020. 
>     
> 9.  Internal Revenue Service. "[Publication 519: U.S. Tax Guide for Aliens](https://www.irs.gov/pub/irs-pdf/p519.pdf)," Page 45. Accessed Jan. 31, 2020.