⚡ US Tax Filing Season 2025/2026 Active • IRS Authorized e-File Provider • Publication 4557 256-Bit Vault Security Calculate Your SPT Refund Position →
2026 Tax Year • Substantial Presence Test (IRC § 7701(b)) • Free Estimator

Estimate Your 2026 US Tax Refund & Filing Status

Check whether you should file Form 1040 (Resident) or Form 1040-NR (Nonresident), view your standard deduction, and calculate your projected refund in under 2 minutes with CPA-verified tax math.

Step 1 of 2: Tax Profile & Presence Disclosures

Calculate Your 2026 Refund & Filing Posture

Standard Deduction Factor
Tax Rules Explained

How the IRS Substantial Presence Test (SPT) Works

Under Internal Revenue Code (IRC) § 7701(b), your tax residency determines whether you file Form 1040 (worldwide income) or Form 1040-NR (US-sourced income only).

Presence Test

The 183-Day Rule

To be classified as a US resident alien under IRC § 7701(b), you must meet two concurrent presence requirements:

1 31 days minimum during 2026
2 183 weighted days over 3 years
Statutory Formula 2026 (×1) + 2025 (×⅓) + 2024 (×⅙) ≥ 183
Visa Exemptions

Exempt Individuals

Certain visa categories exclude days of physical presence from the SPT calculation during their statutory grace period:

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F-1 / J-1 Students Exempt for first 5 calendar years in US
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J-1 Scholars / Researchers Exempt for first 2 calendar years
Mandatory IRS Disclosure Requires Form 8843 Statement
2026 Deductions

Standard Deductions

Form 1040 filers and Indian students under US-India Tax Treaty Article 21(2) claim indexed deductions:

Single Filer $15,000
Married Jointly $30,000
Head of Household $22,500
Article 21(2) Treaty Benefit Full standard deduction for Indian F-1
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