Cross-border tax terms — I
4 terms beginning with I, each defined at mechanism level.
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Each entry answers two questions — what the term picks out, and what changes once it applies. Neither answer needs a number, and a number in a definition tends to outlive its accuracy.
Cross-border vocabulary is mostly a record of disagreement. Two countries look at one arrangement and classify it differently, and the gap between the classifications is where the double tax, or the unintended relief, actually lives. Every entry closes with the filings it touches, because a definition you cannot attach to a form is not yet useful.
Recognising a term like this in your own paperwork is the useful skill. Working out which side of it you fall on is a short call. Every page here carries the name of the person who reviewed it and the date they did.
- Interquartile range — The middle half of a set of comparable results, commonly used as the acceptable range in a transfer-pricing analysis.
- Implicit support — The benefit a group member gets from mere association with the group.
- Input tax credit — Recovery of tax paid on business inputs.
- Importer of record — The party legally responsible for an import, and therefore the party that can recover the import tax.
What the I entries have in common
4 terms begin with I. The term below is defined in full on its own page, alongside the filings it governs and the fee for dealing with them. Three to start with: Interquartile range, Implicit support and Input tax credit.
Nearby letters
H — 4 terms · J — 2 terms. The full A–Z lists all 297 terms in one place.
Back to the full glossary · Cross-border tax answers · Side-by-side comparisons
Files that look like this one
An Adjustment in One Country and No Relief in the Other
A pricing adjustment taxes the same profit twice unless the other country makes a corresponding one. The mutual agreement route is what produces that relief, and it is opened on a timetable set by the treaty rather than by either revenue authority.
Read how this one runsUS Estate Tax on Assets a Canadian Did Not Know Were Exposed
US shares and US real estate sit inside the US estate tax net regardless of where the owner lives. The treaty provides relief that is proportionate rather than automatic, and the calculation depends on the worldwide estate.
Read how this one runsCanadian Pension Paid Abroad and Taxed at the Flat Rate
Pension and annuity payments to a non-resident carry a flat withholding that often exceeds what a return would produce. The alternative filing is elective, and whether it helps depends on the total income for the year rather than on the payment alone.
Read how this one runsSocial Security Contributions Owed in Two Countries at Once
A totalization agreement assigns contributions to one system and exempts the other, but only against a certificate obtained in advance. Without it both sets come out of the same salary and neither is straightforward to recover.
Read how this one runsOne Salary, Two Countries Claiming It
A US citizen resident in Canada, taxed in full on both sides because each return was prepared without the other in view. Deciding which country has the first right to the income, then claiming relief on the second return in the right order, is what stops the same dollar being taxed twice.
Read how this one runsA Relief That Turned on Days Nobody Had Recorded
Treaty exemption, residence and social security are each decided by a count that has to be evidenced rather than recalled. The engagement builds the record from tickets, rosters and payroll before applying any article.
Read how this one runsTrips That Added Up to a Filing Obligation
Short visits are tracked against a treaty threshold that is measured over a moving window rather than a calendar year. Where the threshold is passed, the obligation reaches back over the whole period.
Read how this one runsA Foreign Subsidiary That Nobody Had Been Reporting
Owning a company abroad triggers an information return separate from the corporate return, with its own penalty. The work is the surplus and income computations behind it, which also determine how a future dividend is taxed on the way home.
Read how this one runsAll 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.
U.S. & Cross-Border Tax Returns
Expat & Emigration Tax
Non-Resident Canadian Tax
Transfer Pricing & BEPS
Tax Treaties & Withholding
Cross-Border Estates & Trusts
Global Investments & Reporting
Cross-Border Corporate Tax
India Tax for NRIs & Returning Residents
Canadian Tax with a Foreign Element
UAE Tax for Expats & Their Home Country
Industries & Client Types We Serve Worldwide
Global E-commerce & Marketplaces
Cross-border tax for sellers shipping worldwide: marketplace withholding, foreign registrations and inventory nexus handled before they become audits.
Marketplaces withhold, remit and report in their own right, so the tax position of a single sale is decided by where the stock sat, where the buyer was and which platform collected — not by where the company is registered. We reconcile the platform's own filings against the returns before either is submitted.
- Foreign VAT / GST / sales tax registrations
- Marketplace withholding reviews
- Inventory nexus & PE analysis
- Multi-currency books reconciled
Technology & SaaS
- Cross-border revenue sourcing & withholding
- IP structuring with real substance
- Equity for cross-border teams
- U.S. expansion: entity & PE setup
Professional Services Firms
- Reg 105 / 102 waivers
- Permanent establishment risk
- Partner mobility planning
- Cross-border withholding recovery
Cross-Border Real Estate
- Section 216 rental returns
- FIRPTA withholding recovery
- Section 116 clearance
- Treaty credit optimization
Importers, Exporters & Manufacturers
- Transfer pricing documentation (s.247)
- Customs value vs transfer price
- Foreign affiliate reporting (T1134)
- Country-by-country reporting
Athletes, Artists & Entertainers
- Reg 105 & U.S. CWA agreements
- Multi-state & country calendars
- Touring income allocation
- Royalty & image-rights withholding
Remote Workers & Digital Nomads
- Residency analysis before moving
- Employer payroll exposure
- Totalization & social security
- Foreign tax credits
Investment Funds & Holding Companies
- Treaty access & PPT reviews
- FAPI & surplus computations
- Withholding-efficient routing
- Governance & substance



