TaxDesk field library
Guidance for the work behind the return.
Practical Canadian tax guides and tools for deciding what applies, putting dates around it and keeping the evidence attached.
A useful tax record answers
- 01What applies?Entity, account and activity
- 02When is it due?Period, filing and payment
- 03What proves it?Source, status and history
Start with the operating problem
Three guides that establish the control system
Canadian corporate tax obligations
The full range of what a Canadian corporation can be on the hook for — filings, remittances, elections and records — organized by category and by what triggers each one.
Read the field guideOrganizing tax across a multi-entity group
Entity inventory, ownership structure, program accounts, one filing calendar, shared tax attributes and intercompany balances — how to keep a Canadian corporate group organized.
What belongs in a corporation's tax file
A practical structure for a Canadian corporation's tax records — permanent vs. annual, ownership documents, tax attribute support, intercompany paperwork and CRA correspondence.
Working tools
Move from reading to a dated answer
Subject
15 resources
Guides include primary reading and practical next steps.
Corporate tax calculator
CalculatorsCalculate federal and provincial corporate tax for CCPCs and general corporations, including the small business deduction and investment income.
Updated Jan 2026
Corporate tax rates
ReferencesReference tables for federal and provincial corporate tax rates, CCPC benefits and small business deduction limits across all jurisdictions.
Updated Jan 2026
Tax deadlines tool
CalculatorsTrack Canadian corporate tax, GST/HST, and payroll remittance deadlines, and export them to your calendar.
Updated Jan 2026
Withholding tax calculator
CalculatorsDetermine Canadian withholding tax rates on payments to non-residents based on tax treaties and payment types.
Updated Jan 2026
CPP/EI calculator
CalculatorsCalculate CPP and EI contributions, maximums and stop dates by salary and pay frequency, with 2025 and 2026 limits.
Updated Jan 2026
EIFEL calculator
CalculatorsCalculate the Excessive Interest and Financing Expenses Limitation under s.18.2 ITA, including ATI and the 30% fixed ratio.
Updated Jan 2026
Canadian business tax: a practical operating guide
GuidesA practical guide to Canadian business taxation across corporate structures — obligations, rates and how the pieces fit together.
Updated Jul 2026
GST/HST for Canadian businesses: an operating guide
GuidesUnderstand GST/HST registration, filing frequency, input tax credits and compliance obligations for Canadian businesses.
Updated Jul 2026
Canadian corporate tax obligations
GuidesThe full range of what a Canadian corporation can be on the hook for — filings, remittances, elections and records — organized by category and by what triggers each one.
Updated Jul 2026
What belongs in a corporation's tax file
GuidesA practical structure for a Canadian corporation's tax records — permanent vs. annual, ownership documents, tax attribute support, intercompany paperwork and CRA correspondence.
Updated Jul 2026
Organizing tax across a multi-entity group
GuidesEntity inventory, ownership structure, program accounts, one filing calendar, shared tax attributes and intercompany balances — how to keep a Canadian corporate group organized.
Updated Jul 2026
CDA, GRIP, RDTOH and corporate losses
GuidesA plain-English guide to the capital dividend account, GRIP, eligible and non-eligible RDTOH, and non-capital, net capital and ABIL loss pools — what they are and where they come from.
Updated Jul 2026
Shareholder and intercompany loans
GuidesThe difference between a shareholder loan and an intercompany loan, subsection 15(2) at a high level, interest and documentation, and reconciling balances between entities.
Updated Jul 2026
Why ownership and share-class records matter
GuidesLegal vs. beneficial ownership, voting vs. value, paid-up capital, dividends by share class, associated corporations and changes of control — what the ownership record needs to show.
Updated Jul 2026
Canadian business entity types and their tax obligations
GuidesCorporations, professional corporations, partnerships, trusts and sole proprietorships — how each is taxed, and why 'holding company' isn't a separate legal entity type.
Updated Jul 2026
Use the library with your team
Guidance changes when the operating context changes.
Firms need portfolio visibility across client entities. Corporate teams need one group record across ownership, obligations and evidence. The tax rules may overlap; the control problem does not.
Editorial standard
Primary sources, visible limits and no invented authority.
Technical guides link to official CRA, Finance or legislative starting points.
Every guide shows when it was updated and points readers to the underlying primary material.
Estimates and educational guidance should be confirmed before a real filing or transaction relies on them.
From reference to record
TaxDesk keeps the work connected after the article ends.
Bring entities, CRA program accounts such as corporate income tax, GST/HST, and payroll, obligations, and documents into one workspace, then review the record with source context intact.