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TaxDesk field library

Find the rule. Set the date. Keep the evidence.

Use practical Canadian tax guides and tools to identify obligations, calculate dates, and organize supporting records.

A useful tax record answers

  1. 01What applies?Entity, account and activity
  2. 02When is it due?Period, filing and payment
  3. 03What proves it?Source, status and history

Subject

24 resources

01

Corporate tax coordination checklist for controllers

Guides

Keep entities, filing and payment evidence, CRA notices, tax balances, and external advisor handoffs organized without an internal tax department.

Updated Oct 2026

02

Productivity Mega Deduction calculator

Calculators

Estimate immediate expensing, compare the proposed deduction with existing CCA rules, and see the incremental corporate tax effect.

Updated Sep 2026

03

Corporate tax calculator

Calculators

Calculate federal and provincial corporate tax for CCPCs and general corporations, including the small business deduction and investment income.

Updated Jan 2026

04

Corporate tax rates

References

Reference tables for federal and provincial corporate tax rates, CCPC benefits and small business deduction limits across all jurisdictions.

Updated Jan 2026

05

Tax deadlines tool

Calculators

Track Canadian corporate tax, GST/HST, and payroll remittance deadlines, and export them to your calendar.

Updated Jan 2026

06

Withholding tax calculator

Calculators

Determine Canadian withholding tax rates on payments to non-residents based on tax treaties and payment types.

Updated Jan 2026

07

CPP/EI calculator

Calculators

Calculate CPP and EI contributions, maximums and stop dates by salary and pay frequency, with 2025 and 2026 limits.

Updated Jan 2026

08

EIFEL calculator

Calculators

Calculate the Excessive Interest and Financing Expenses Limitation under s.18.2 ITA, including ATI and the 30% fixed ratio.

Updated Jan 2026

09

Canadian business tax: a practical operating guide

Guides

A practical guide to Canadian business taxation across corporate structures — obligations, rates and how the pieces fit together.

Updated Jul 2026

10

GST/HST for Canadian businesses: an operating guide

Guides

Understand GST/HST registration, filing frequency, input tax credits and compliance obligations for Canadian businesses.

Updated Jul 2026

11

Canadian corporate tax obligations

Guides

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.

Updated Jul 2026

12

What belongs in a corporation's tax file

Guides

A 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

13

Organizing tax across a multi-entity group

Guides

Entity 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

14

CDA, GRIP, RDTOH and corporate losses

Guides

A 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

15

Shareholder and intercompany loans

Guides

The 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

16

Why ownership and share-class records matter

Guides

Legal 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

17

Canadian business entity types and their tax obligations

Guides

Corporations, 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

18

T2 notice of assessment explained

References

CRA’s summary of a corporation’s T2 return after it has examined it: the assessed amounts, any changes, and the balance owing or refund.

Updated Oct 2026

19

T2 notice of reassessment explained

References

CRA’s updated summary of a corporation’s T2 return after it has changed the return following the original assessment.

Updated Oct 2026

20

GST/HST notice of assessment explained

References

CRA’s assessment of the net tax for one GST/HST reporting period, which confirms the return or changes it.

Updated Oct 2026

21

PD7A statement of account explained

References

A statement of an employer’s previous payroll remittances, with the voucher to use for the next one.

Updated Oct 2026

22

PIER review explained

References

CRA’s annual check that the CPP and EI reported on T4 slips match what the employees’ earnings required.

Updated Oct 2026

23

CRA audit letter explained

References

The letter or call that starts a CRA audit, setting out when and where it will take place.

Updated Oct 2026

24

CRA proposal letter explained

References

The letter an auditor sends to explain a proposed reassessment before it is made.

Updated Oct 2026

Use the library with your team

Choose guidance for your team and responsibilities.

CPA firms must review work across many client entities. Corporate teams must connect ownership, obligations, and evidence across a group. Choose the guidance that matches your work.

Editorial standard

Check the source, date, and limits.

Technical guides link to CRA, Finance Canada, or legislation where applicable.

Each guide shows its update date and links to primary source material.

Confirm estimates and guidance before you file or make a transaction.

From reference to record

Turn guidance into work your team can track.

Keep entities, tax-program registrations, obligations, and documents in one workspace. Review each record with its supporting documents.

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