Standard Deduction vs Itemizing for Cross-Border Filers

The standard deduction is the largest single deduction on most US tax returns ($15,750 for single filers in 2025, $31,500 for married filing jointly), and it is available to US residents without any itemization. But cross-border filers often cannot claim it, either because they are non-resident aliens, because they are filing a dual-status return, or because their filing status limits the deduction. Understanding when the standard deduction is available (and when itemizing is the better or only option) can change the US tax liability by thousands of dollars.

Who gets the standard deduction?

Full-year US residents (citizens and resident aliens). You get the standard deduction. Period. Whether you are a US citizen living in Canada (filing a 1040 with FTC), a Canadian who moved to the US and is a full-year resident, or a green card holder, the standard deduction is available. Choose it or itemize, whichever is larger.

• Non-resident aliens (1040-NR filers). You do not get the standard deduction. The 1040-NR requires itemizing, and only deductions that are “connected with” effectively connected income are allowed (IRC 873(a)). This means a Canadian who files a 1040-NR for US rental income can deduct mortgage interest, property taxes, and depreciation on the rental, but cannot claim the standard deduction.
• Dual-status filers. If you are filing a dual-status return for the year you arrived in or departed from the US, you cannot claim the standard deduction. You must itemize for the resident portion and follow NRA rules for the non-resident portion. However, if you make the full-year election under IRC 7701(b)(4), you are treated as a full-year resident and can claim the standard deduction.
• Married filing separately (MFS). If you are MFS because you cannot or choose not to file jointly with your non-resident spouse, the standard deduction is $15,750 (2025). But if your spouse itemizes, you must also itemize. This rule catches cross-border couples where one spouse files a 1040 and the other files a 1040-NR (which requires itemizing), because the NRA spouse’s itemizing triggers the rule.

What are the 2025 standard deduction amounts?

These are the standard deduction amounts for the 2025 tax year, based on filing status.

Filing status	Standard deduction (2025)
Single	$15,750
Married filing jointly	$31,500
Married filing separately	$15,750
Head of household	$23,625
Additional (age 65+ or blind)	$1,600 (single); $1,300 (married)

The standard deduction is indexed for inflation annually.

When should a cross-border filer itemize instead?

Itemizing makes sense when your total itemized deductions exceed the standard deduction. The most common itemized deductions for cross-border filers:

• State and local taxes (SALT). The deduction for state income taxes, property taxes, and sales taxes is capped at $40,000 ($20,000 MFS) through 2029 under the One Big Beautiful Bill Act, with an income-based phase-down for higher earners. The TCJA originally set the cap at $10,000; the OBBBA quadrupled it, making itemizing more attractive for filers in high-tax states. A cross-border filer in New York or California who pays $20,000 in state income tax and $15,000 in property tax can now deduct the full $35,000 (below the $40,000 cap), where under the prior $10,000 cap, $25,000 of that total was non-deductible.
• Canadian taxes. Canadian income taxes are not deductible as an itemized deduction. You claim them as a foreign tax credit on Form 1116 instead. Deducting foreign taxes as an itemized deduction (instead of claiming the credit) is almost never beneficial because the FTC is a dollar-for-dollar credit against tax, while the deduction only reduces taxable income.
• Mortgage interest. Mortgage interest on a primary residence (up to $750,000 of acquisition indebtedness) and a second home is deductible. For cross-border filers who own a US home, this is often the largest potential itemized deduction. If your mortgage interest exceeds the standard deduction (minus SALT), itemizing may save money.
• Charitable contributions. Donations to US-qualified charities (501(c)(3) organizations) are deductible. Donations to Canadian charities are generally not deductible on the US return, except under the treaty provision (Article XXI(7)) that allows US filers with Canadian-source income to deduct contributions to Canadian charities, limited to the percentage of Canadian-source income.
• Medical expenses. Medical expenses exceeding 7.5% of AGI are deductible. For cross-border filers, medical expenses paid in Canada (to Canadian healthcare providers, for services not covered by provincial health insurance) can be included, as long as they are qualified medical expenses under IRC 213.

What about the treaty personal exemption?

The Canada-US treaty provides, under Article XXV (Non-Discrimination), that Canadian residents filing a 1040-NR are entitled to the same personal exemptions and deductions as US citizens, provided the Canadian-source income constitutes at least 75% of their total income. The personal exemption was eliminated by the TCJA and made permanently zero by the OBBBA, so this treaty provision provides limited direct benefit. However, it does ensure that Canadians filing 1040-NR have the same itemized deduction rules as US citizens (which they would have anyway under IRC 873(a) for ECI-connected deductions).

• The treaty does not give NRAs the standard deduction. The standard deduction is a filing-status-based deduction under IRC 63(c), and the treaty’s non-discrimination provision ensures equal treatment within the deduction framework, not the creation of deductions that do not exist for NRAs under domestic law.

How does the SALT cap affect cross-border filers?

The SALT cap under IRC 164(b)(6) is now $40,000 ($20,000 MFS) through 2029, up from the TCJA’s original $10,000. The One Big Beautiful Bill Act quadrupled the cap, which materially changes the itemizing calculus for filers in high-tax states. Before the OBBBA, most cross-border filers in New York or California chose the standard deduction because the $10,000 cap strangled the value of itemizing. The higher cap reverses that for many:

• Example: a US citizen in New York with $15,000 in state income tax and $12,000 in property tax can now deduct the full $27,000 (under the $40,000 cap). Add $8,000 in mortgage interest and $3,000 in charitable contributions. Total itemized deductions: $38,000. The standard deduction for single filers is $15,750, so itemizing saves $22,250 in deductions. At a 24% bracket, that is $5,340 in tax savings from itemizing, a significant improvement over the $1,260 that same filer would have saved under the old $10,000 cap.
• For a filer in a no-income-tax state (Florida, Texas), the SALT deduction is limited to property taxes (now capped at $40,000 rather than $10,000, though few residential property tax bills hit even the old cap). Without significant mortgage interest or charitable contributions, the standard deduction is still usually larger.

What should I do next?

If you are a cross-border filer, compare the standard deduction to your potential itemized deductions. For most full-year US residents, the standard deduction wins unless you have large mortgage interest. For NRAs and dual-status filers, itemizing is required, and the question is which deductions are available.

• Form 1040-NR for Canadians, the return that requires itemizing
• Dual-status vs full-year election, the election that unlocks the standard deduction
• Filing jointly with a non-resident spouse, when joint filing (and the larger standard deduction) is available
• Cross-border charitable giving, the treaty rule for Canadian charity deductions
• Canada vs US tax rates, the rate context for these deduction decisions

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.