Substantial Presence Test
If the individual meets the SPT for the year, residence generally begins on the first day of U.S. presence during that calendar year, subject to excluded days and the special 10-day de minimis rule.
TaxRepTaxRepU.S. Income Tax Guide · IRC § 7701(b)(2)
For a non-U.S. citizen, becoming a U.S. resident alien is not always an all-year event. IRC § 7701(b)(2) and Treas. Reg. § 301.7701(b)-4 determine the residency starting date under the Substantial Presence Test, the Green Card Test and the First-Year Election.
First Year of U.S. Residence
A non-U.S. citizen can become a U.S. resident alien under several different rules. The residency starting date depends on which rule applies. The main routes are the Substantial Presence Test, the Green Card Test and the First-Year Election.
The distinction is important because the residency starting date can divide the year into a nonresident period and a resident period. That can produce a dual-status tax year, with different sourcing, deduction and filing rules applying before and after the change in status.
If an individual qualifies under more than one residency test in the same year, special rules determine which starting date controls.
Three Main Routes
If the individual meets the SPT for the year, residence generally begins on the first day of U.S. presence during that calendar year, subject to excluded days and the special 10-day de minimis rule.
If the individual becomes a lawful permanent resident, the starting date is generally the first day during the calendar year on which the individual is physically present in the United States as a lawful permanent resident.
An individual who does not otherwise meet the Green Card or SPT rules in the arrival year may be able to elect resident treatment beginning with the first day of a qualifying 31-day period.
Substantial Presence Test
If an individual was not a U.S. resident during the preceding calendar year and meets the Substantial Presence Test in the current year, Treas. Reg. § 301.7701(b)-4 generally sets the residency starting date as the first day during that year on which the individual is physically present in the United States.
This can cause the resident period to begin months before the individual technically satisfies the weighted 183-day calculation.
An individual arrives in the United States on March 1 and remains long enough to satisfy the Substantial Presence Test for that calendar year.
SPT Day Counting
The starting-date rule must be coordinated with the day-exclusion rules in Treas. Reg. § 301.7701(b)-3.
Days excluded because the individual qualifies as an exempt individual generally do not count as presence for determining the residency starting date.
Qualifying days excluded because a medical condition prevented departure can affect both the SPT calculation and the residency starting date.
Qualifying transit, commuter and crew-member days can also be excluded under the statutory and regulatory rules.
Green Card Test
For an individual who meets the Green Card Test but not the SPT, the residency starting date is generally the first day during the calendar year on which the individual is physically present in the United States as a lawful permanent resident.
If the individual technically meets the Green Card Test for the current year but is not physically present in the United States at any time during that year, Treas. Reg. § 301.7701(b)-4 contains a special rule under which the starting date is generally the first day of the following year.
Both Tests Apply
If an individual satisfies both the Green Card Test and the Substantial Presence Test in the same year, the residency starting date is generally the earlier of:
IRC § 7701(b)(4)
An individual who does not meet the Green Card Test or SPT in the arrival year may nevertheless elect to be treated as a resident for part of that year if the statutory presence conditions are satisfied and the individual becomes a U.S. resident under the SPT in the following year.
The individual must be physically present in the United States for at least 31 consecutive days during the election year.
Beginning with the first day of the qualifying 31-day period, the individual must generally be present in the United States for at least 75% of the remaining days in the year. Up to five days of absence can be treated as present solely for this 75% test.
The individual must qualify as a U.S. resident under the Substantial Presence Test in the following calendar year.
Election Procedure
The election is made by attaching the required statement to the U.S. income tax return. The statement identifies the qualifying 31-day period, continuous-presence period, relevant absences and other required information.
The IRS explains that the current-year Form 1040 and election statement generally cannot be filed until the individual has actually met the Substantial Presence Test in the following year. An extension may therefore be necessary.
Treas. Reg. § 301.7701(b)-4(c)(1)
An individual may disregard up to 10 days of U.S. presence when determining the residency starting date under the SPT if, during those days, the individual maintained a foreign tax home and a closer connection to that foreign country than to the United States.
Important Distinction
The early days still count toward the 31-day and weighted 183-day calculations used to determine whether the individual meets the SPT.
If the special requirements are met, those same days may nevertheless be ignored solely for determining the date on which resident-alien status begins.
No-Lapse Rules
Treas. Reg. § 301.7701(b)-4(e) contains important continuity rules that can override what might otherwise appear to be separate resident and nonresident periods.
If the individual was a U.S. resident during any part of the preceding calendar year and is again a resident during any part of the current year, the individual is generally treated as resident from January 1 of the current year.
If the individual is resident during part of the current year and again resident during part of the following year, the current-year resident period generally continues through December 31.
Dual-Status Year
Before the residency starting date, the individual is generally taxed under the rules applicable to nonresident aliens, primarily on specified U.S.-source income and effectively connected income.
From the residency starting date, the individual is generally taxed as a U.S. resident alien on worldwide income, subject to foreign tax credits, treaty provisions and other applicable rules.
Administrative Guidance
The statute provides the residency starting and termination rules for individuals becoming or ceasing to be resident aliens.
IRC § 7701The principal regulation explains first-year residency, starting dates, termination dates, the 10-day rule, First-Year Election and no-lapse rules with detailed examples.
RegulationThe U.S. Tax Guide for Aliens provides the IRS administrative explanation of residency starting dates, First-Year Election and dual-status years.
Publication 519The IRS separately explains the 31-day period, 75% continuous-presence requirement, following-year SPT condition and filing procedure.
First-Year Choice guidanceWhere residence changes during the year, this regulation coordinates the taxation of the resident and nonresident portions of the year.
RegulationIf another country also treats the individual as resident, Treas. Reg. § 301.7701(b)-7 and an applicable income tax treaty may affect the U.S. filing position.
Treaty regulationCase Law
The residency starting-date regime is driven primarily by statute and Treasury Regulations. Litigation tends to concern whether resident status exists, whether particular days count or whether treaty rules alter domestic resident status rather than interpretation of the starting-date formula itself.
The Court of Federal Claims applied § 7701(b) in determining resident-alien status and referenced the statutory residency rules governing an individual who satisfies the Substantial Presence Test.
Practical significance: The residence period is a statutory tax status. Personal assertions about domicile or citizenship do not replace the § 7701(b) analysis.
DecisionThe Topsnik litigation concerned lawful permanent resident status and the U.S.–Germany treaty. Although not a starting-date case, it illustrates that domestic resident-alien status must first be determined under U.S. law before treaty residence is analyzed separately.
Practical significance: A move abroad does not automatically change the domestic residency period established under § 7701(b).
Aroeste addressed the interaction between lawful permanent residence, treaty residence and the statutory resident-alien rules.
Practical significance: The domestic starting date and a subsequent treaty-based nonresident position are distinct legal questions and should not be collapsed into one analysis.
DecisionThe most common issues are identifying the first countable day, proving a foreign tax home and closer connection for early de minimis days, and satisfying the procedural requirements for a First-Year Election.
Practical significance: A precise travel calendar and contemporaneous documentation are essential in a moving year.
Practical Checklist
Determine whether the Green Card Test, SPT, First-Year Election or more than one rule applies.
List every U.S. arrival and departure and identify excluded days.
For an SPT year, identify the first day that counts as U.S. presence.
Determine whether early presence can be disregarded solely for the starting-date calculation.
Check whether residence in the preceding or following calendar year creates continuous resident treatment.
Analyze whether the year is dual-status and which Form 1040, Form 1040-NR and disclosure requirements apply.
Germany–U.S. Context
The U.S. residency starting date determines when U.S. resident-alien taxation begins under domestic law. German residence must be analyzed independently. In a moving year, the two domestic systems can overlap, requiring treaty and foreign-tax-credit coordination.
How U.S. residence begins, how the moving year is handled and how German tax consequences interact with the U.S. system.
Open situation guideResident and nonresident periods, dual-status filing and cross-border coordination during the year of a move.
Open moving-year guideFrequently Asked Questions
U.S. Tax Advice
We determine the U.S. residency starting date, resident and nonresident periods, First-Year Election options and the resulting dual-status and cross-border filing requirements.
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