CRA Notice of Objection Navigator for Small Businesses

The situation

Chantal, 41, runs a 6-person renovation company near Ottawa. A CRA audit reassesses her 2023 corporate return: CA$38,000 more tax, vehicle expenses reclassified as personal (shareholder benefit under s.15), and CA$11,000 of GST/HST input tax credits denied for "insufficient documentation." Her year-end accountant doesn't do disputes; a tax lawyer quotes CA$9,000. She has 90 days to object or the reassessment becomes collectible as final. What she doesn't know: the ITC denials are the most winnable category in CRA objections, the Input Tax Credit Information Regulations set specific documentary requirements, and deficiencies (missing supplier GST numbers on invoices) are usually curable by obtaining corrected invoices; the s.15 shareholder-benefit assessment turns on characterization she can rebut with logbooks and the corporate purpose of each trip; and filing the objection suspends income-tax collection, but not the GST/HST portion, which keeps accruing interest unless she pays it under protest.

Who receives this

Canadian incorporated small businesses and sole proprietors (1–20 staff) receiving CRA reassessments of CA$5k–$50k, contractors, restaurants, e-commerce sellers, consultants, farm operations. Secondary: bookkeepers whose clients receive reassessments outside the bookkeeper's scope.

Why the agency will not advise you

The CRA auditor cannot advise on objecting to their own reassessment; CRA Appeals reviews but does not coach. The CRA portal is a filing pipe, the entire drafting burden (facts/issues/reasons + evidence schedule) sits with the taxpayer. Tax lawyers price for CA$100k+ disputes; the CA$5k–$50k SMB reassessment band is professionally orphaned.

Key facts, with sources

• A taxpayer objecting to a CRA assessment or reassessment files form T400A or uses 'Register my formal dispute' in CRA online services; the objection must state the relevant facts and reasons, and electronic filing through My Account / My Business Account is the standard route, the portal collects the objection text but provides no guidance on constructing grounds. Source: T400A Notice of Objection — Income Tax Act — Canada.ca · Notice of Objection (T400A): Deadlines, Steps, Timelines — KR Law Firm
• The objection must include a detailed statement of facts, the issues in dispute, and the relief requested, with supporting evidence attached, the facts/issues/reasons structure is the substantive drafting burden the self-represented taxpayer carries, and the professional market for handling it is tax lawyers and CPAs at multi-thousand-dollar retainers. Source: T400A Notice of Objection — Income Tax Act and Excise Tax Act (GST/HST) Guide — taxpayer.law · Objection to an assessment — Thomson Reuters DT Professional Suite
• Third-party presence in this proceeding is limited to fillable-PDF hosts (pdfFiller, DocHub, FormsPal), form completion utilities with no grounds-drafting or evidence-structuring capability. Source: Form Canada T400A — pdfFiller · T400a: Fill out & sign online — DocHub

When to bring in a professional

Self-serve responses fit routine cases: clear facts, amounts a business can absorb, and a deadline still ahead of you. Bring in a licensed professional when the amount at stake is large relative to their fee, the facts are genuinely disputed, criminal exposure is possible, or the deadline has already passed. A short paid consultation to sanity-check your plan is often worth it even when you handle the filing yourself.

All sources for this guide

1. T400A Notice of Objection — Income Tax Act — Canada.ca
2. Notice of Objection (T400A): Deadlines, Steps, Timelines — KR Law Firm
3. T400A Notice of Objection — Income Tax Act and Excise Tax Act (GST/HST) Guide — taxpayer.law
4. Objection to an assessment — Thomson Reuters DT Professional Suite
5. Form Canada T400A — pdfFiller
6. T400a: Fill out & sign online — DocHub