Who files Form W-7?

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Answer

Non-resident filers, spouses and dependants who must file or be claimed on a US return, and non-resident sellers of US property. The obligation is decided by facts rather than by tax owing, which is why a nil position does not remove it.

The rule on who files

Non-resident filers, spouses and dependants who must file or be claimed on a US return, and non-resident sellers of US property.

Two of the firm’s advisers and the team in the open-plan office

When it does not bind you

The number is the gate. Withholding refunds, treaty claims and property-sale certificates all stall without it, identity documents must be certified in a specific way, and the application usually travels with the return that needs it.

Who files Form W-7?
ItemAmount
Income taxed in both countriesC$168,000
Tax paid abroad (assumed 22%)C$36,960
Home tax on the same income (assumed 38%)C$63,840
Credit available (lesser of the two)C$36,960
Home tax still payableC$26,880

The credit absorbs C$36,960 and leaves C$26,880 payable at home, because the home rate on this income is the higher of the two. The balance is real cash and it is due on the home timetable, which is why instalments get raised in the first meeting.

Example figures throughout, selected to make the rule visible, with rates and thresholds assumed for the demonstration. Your actual filing uses figures confirmed with the issuing authority for your tax year.

Your next step

The full treatment — who it binds, the deadline, the penalty and the fixed fee — is on W-7 — ITIN application. We would rather scope it properly than quote it quickly.

Checked and signed off for the 2025 and 2026 filing seasons by Udit Gupta, Cross-Border Tax Expert, Legal Quotient Consultants. This is general information rather than advice about your file — a short call is the way to get the second.

Who has to file US tax return — what this page covers

The subject here is Form W-7, which is what people mean when they search for who has to file US tax return. This page covers who it applies to, the filings it produces, and the fixed fee agreed before work begins.

Cross-border situations we are engaged for

Case study 1

Non resident seller needed a number before the closing could settle

A vendor selling a US property discovered, close to completion, that the certificate reducing the withholding at closing could not be applied for without a tax number. We prepared the application, arranged for the identity documents to be certified acceptably, and filed it with the certificate request. The engagement produced an issued number and a filed certificate request, and with them a documented basis for the amount withheld at closing rather than the full default sum held back against a later claim.

Read how this one runs
Case study 2

Spouse added to a joint return that had been waiting on a number

A client's return could not be filed on the basis he wanted, because his wife had no US tax number and was not eligible for one. We prepared her application, dealt with the certification of her identity documents, and filed the application together with the return it supported. What the engagement produced was a return filed on the intended basis, with the number and the claim arriving as one submission rather than a filing made now and corrected later.

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Case study 3

Treaty claim on royalty payments held up for want of a number

A non-resident author was having tax withheld on royalty payments at the default rate, because the claim reducing it had nowhere to attach. We identified the filing the claim had to sit behind, prepared the number application with certified identity documents, and submitted them together. The engagement produced an issued number, a filed claim on the record for the payer to work from, and a documented position on the rate to apply to payments going forward.

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Case study 4

Identity documents certified so the client kept his passport

An applicant had abandoned an earlier attempt rather than post his passport abroad, and had gone two filing seasons without the number he needed. We arranged certification of the identity documents in a form that would be accepted while the originals stayed with him, and filed the application again. The engagement produced an issued number and a record of how the documents had been certified, which he could point to when the same question came up for his children the following year.

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Case study 5

Dependants' applications filed as a set with the return claiming them

A family needed numbers for two children who were being claimed on a US return, and had been filing without them. We prepared an application for each child, with its own certified identity documents, and filed the set with the return that claimed them. What the engagement produced was a filed return whose dependant claims were supported by applications submitted at the same time, and a single file of the family's certified documents for use in later years.

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Case study 6

Withholding on rental payments reclaimed once the number existed

An owner of US rental property had tax withheld at source for years and had never filed, because she had no tax number and no clear idea where to start. We prepared the application, dealt with the identity documents, and filed it with the first of the returns reporting the rental income on the basis she was entitled to use. The engagement produced an issued number and filed returns for the open years, putting the over-withheld amounts into a claim instead of leaving them unclaimed.

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Case study 7

Whether the Year Made Someone an NRI

Indian residence is decided by presence tests applied to the financial year, and a single trip can change the answer for the whole of it. The status is established before any return or exemption is considered.

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Case study 8

Documentation Requested, and the Deadline Is Not Extendable

Contemporaneous documentation has to exist by the filing deadline, not be assembled when it is asked for, and the penalty protection turns on that timing. The engagement produces the analysis for the year in question and puts a repeatable process behind the next one.

Read how this one runs

All case studies — every published engagement in one place.

Core International & Cross-Border Tax Services

International Tax Planning & Advisory

Strategy and compliance for income, assets and families spread across borders.

One coordinating team: filings on every side of the border are sequenced so treaty relief and foreign tax credits are claimed once — and in the right country.

U.S. & Cross-Border Tax Returns

Dual filers: U.S. citizens in Canada and Canadians with U.S. income run two parallel systems — we prepare both, in the right order, every year.

Expat & Emigration Tax

The move year is its own project: the elections and valuations filed that year decide the next decade of both countries’ returns.

Non-Resident Canadian Tax

Default withholding is 25% of gross: elective returns routinely turn over-withheld rent and pensions into refunds.

Transfer Pricing & BEPS

Documentation prepared with the return is the cheapest insurance in international tax; reconstructing it during an audit is the most expensive.

Cross-Border Estates & Trusts

Wills drafted for one country routinely misfire in the other — deemed disposition here, estate tax there, credits in between.

Cross-Border Corporate Tax

Expansion raises the same four questions every time — entity, PE, repatriation, payroll. We answer them before the tax authorities do.

India Tax for NRIs & Returning Residents

The deduction is taken on the sale price, not the gain — which is why an NRI property sale strands cash unless the certificate is applied for before closing.

Canadian Tax with a Foreign Element

Residency is decided on facts, not on a form — and the year you arrive or leave is the one where the largest amounts turn on the smallest details.

UAE Tax for Expats & Their Home Country

A zero-tax country is only half the answer — the question that decides the bill is whether the country you came from still treats you as resident.

Industries & Client Types We Serve Worldwide

Global E-commerce & Marketplaces
Technology & SaaS
Professional Services Firms
Cross-Border Real Estate
Importers, Exporters & Manufacturers
Athletes, Artists & Entertainers
Remote Workers & Digital Nomads
Investment Funds & Holding Companies

Global E-commerce & Marketplaces

  • Foreign VAT / GST / sales tax registrations
  • Marketplace withholding reviews
  • Inventory nexus & PE analysis
  • Multi-currency books reconciled
Explore E-commerce & Marketplaces

Technology & SaaS

  • Cross-border revenue sourcing & withholding
  • IP structuring with real substance
  • Equity for cross-border teams
  • U.S. expansion: entity & PE setup
Explore Technology & SaaS

Importers, Exporters & Manufacturers

  • Transfer pricing documentation (s.247)
  • Customs value vs transfer price
  • Foreign affiliate reporting (T1134)
  • Country-by-country reporting
Explore Trade & Manufacturing

Athletes, Artists & Entertainers

Performance income is taxed where earned — Regulation 105 in Canada, withholding agreements in the U.S. — with special treaty articles overriding the usual rules.

Performance income is taxed where the performance happens, and the deduction is usually taken at source on the gross fee before expenses. Recovering the difference is a filing exercise in the other country, and it only works if the tour, the residency and the withholding certificates were documented while the work was being done.

  • Reg 105 & U.S. CWA agreements
  • Multi-state & country calendars
  • Touring income allocation
  • Royalty & image-rights withholding
Explore Athletes & Entertainers

Remote Workers & Digital Nomads

  • Residency analysis before moving
  • Employer payroll exposure
  • Totalization & social security
  • Foreign tax credits
Explore Remote Workers

Investment Funds & Holding Companies

  • Treaty access & PPT reviews
  • FAPI & surplus computations
  • Withholding-efficient routing
  • Governance & substance
Explore Funds & Holdcos

What people ask us about Form W-7

Can I get an ITIN without filing a US tax return?

In most cases the application travels with the return that needs it rather than going in on its own. The number exists to let a filing or a claim happen, so the first question is which return or claim is driving it. There are situations where a number is needed for something other than a return, and a withholding certificate on a property sale is the common one. Those are handled differently. Working out which of the two you are in decides what goes in the envelope.

Does my spouse need an ITIN to go on my US return?

If your spouse has to be on the return and is not eligible for a social security number, then yes, the number is what puts them there. The application is prepared with the return and the two are filed together. What delays these is almost never the form. It is the identity documents, which have to be certified in a particular way before they will be accepted. We sort the documents out before anything is submitted, because a return held up waiting on a number is also a return that is not yet filed.

Do I need an ITIN to sell my US property as a non-resident?

Non-resident sellers of US property are squarely in the group who need the number, and the timing is what causes the pain. The number is a gate. The withholding certificate that reduces what is held back at closing, and the return that reclaims an over-withheld amount afterwards, both stall without it. Sellers usually discover this in the week the sale is closing, which is the worst moment to be gathering certified identity documents. Started early it is administration; started late it is money sitting with the tax authority for a year.

Can I send a photocopy of my passport with Form W-7?

Identity documents have to be certified in a specific way, and an ordinary photocopy is the most common reason an application comes back. That is also why people put off applying, since nobody wants to post an original passport abroad and wait. The practical route is to have the documents certified acceptably so the originals stay with you, and to arrange that before the return or the claim is ready to go, rather than discovering the requirement when everything else is finished.

Do my children need ITINs if I claim them on my return?

Dependants who are claimed on a US return and cannot obtain a social security number need their own numbers, one each. The applications are prepared alongside the return that claims them, and each needs its own certified identity documents, which for children is the part families underestimate. We prepare the household's applications as a set and file them with the return, so the claim and the numbers supporting it arrive together instead of the return going in and being adjusted while the numbers catch up.

Why can I not get my US tax back without an ITIN?

Because the number is the gate, and nothing downstream of it moves. A repayment of over-withheld tax, a treaty claim that reduces the rate on a payment, a certificate on a property sale: each needs a filer the system can identify, and until the number exists there is no filer. It is rarely a question of the claim being wrong. It is that the claim has nowhere to attach. Applying for the number and filing the claim it supports as one exercise is what shortens the wait.

How are non-residents taxed on Canadian rental income?

By default the payer or agent withholds a flat rate on the gross rent and remits it, with no deduction for mortgage interest, taxes or repairs. Electing under section 216 lets you file on the net rental result instead, which for most properties recovers a substantial part of what was withheld; an NR6 undertaking filed before the year starts lets the withholding itself be computed on net rather than gross. See the section 216 return.

What is Part XIII withholding?

Canada's flat withholding on certain payments to non-residents — dividends, interest to related parties, rents, royalties, pension and annuity payments, management fees. The payer withholds and remits, and is liable if they do not, which is why they insist on documentation. A treaty can reduce the rate, but only where the recipient has given the payer the declaration establishing entitlement before payment. Where too much was withheld, a refund claim is the route, with its own time limit. See Part XIII withholding review.

Our practitioners are alumni of leading accounting and tax institutions

Where our partners studied — CPA Canada (In-Depth Tax Program), AICPA, the Institute of Chartered Accountants of India and the Malaysian Institute of Accountants.

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