About this series
The SiLaw Canadian Tax series — Job-S6: Canadian Tax & Cross-Border Complete Path — is built for newcomer SME founders, cross-border entrepreneurs, SaaS / manufacturing / tech owners, SMEs facing CRA audits, and multi-province operators. The season covers six pillars: ① Canadian corporate tax basics (CCPC advantage, SBD $500K, four-province combined rates 11%–12.2%, $10M–$50M taxable capital phase-out, $50K–$150K passive income clawback); ② GST/HST/QST consumption tax ($30K threshold, four-province rates, 4-year ITC window, place of supply, QST specifics); ③ US-Canada cross-border tax (LLC double-tax trap, FBAR / Form 8938, treaty W-8BEN, transfer pricing, dual citizen filing); ④ Owner compensation salary vs dividend (TOSI, 5% prescribed rate, s.15(2) shareholder loans, family trust LCGE $1,016,836); ⑤ CRA audit defense (10 triggers, 90-day objection, VDP three streams, 3/6/unlimited statutes of limitations); ⑥ SR&ED 2025 expansion ($6M limit, $2.1M refundable cap, 35% federal CCPC, 30% Quebec top-up). Sources: CRA, Revenu Québec, IRS, Department of Finance Canada — covering all major 2025–2026 updates (SR&ED doubled, DST repealed, bare trust suspended, prescribed rate 5%). Free-to-read, available in EN / ZH / FR.
Series at a glance — 6-episode roadmap
Canadian Corporate Tax Basics — CCPC advantage and four-province combined rates 2026
CCPC definition (not non-resident or public-company controlled) · SBD on first $500K · four-province combined rates (ON/QC 12.2%, BC 11%, AB 11%) · general rates 26.5% / 27% / 23% · taxable capital phase-out from $10M, eliminated at $50M · passive income clawback from $50K to zero at $150K · associated corporations share the $500K · SIB rule (property income business with <6 full-time employees = all passive) · RDTOH/GRIP integration mechanics
Key data: SBD value at peak = (26.5% − 12.2%) × $500K = $71,500 annual deferral, but passive income or capital scale crossing the threshold triggers a “double penalty”
GST/HST/QST Consumption Tax — $30K threshold and four-province rate map
$30,000 threshold (single quarter or 4 consecutive quarters, worldwide taxable supplies) · ON HST 13% · Atlantic four-province HST 15% · QC GST+QST 14.975% · BC GST+PST 12% · AB / three territories GST only 5% · place of supply rules B2C/B2B distinction · 4-year ITC claim window (reduced to 2 years above $6M revenue) · QST digital economy law (Amazon/Netflix must register) · 5 audit triggers
Lethal trap: The $30K threshold has NOT been raised since 1991 — it is the most-tripped compliance pitfall for newcomers, and registration is required before the next supply once triggered
US-Canada Cross-Border Tax — LLC double-tax trap, FBAR, treaty and transfer pricing
Tax residency tests (primary ties, secondary ties, 183 days) · US citizens taxed worldwide (uniquely) · Canada-US treaty (interest 0%, dividends 5%/15%, royalties 0–10%) · W-8BEN / W-8BEN-E · four PE types (fixed / service / construction / agency) · LLC double-tax trap (Canada treats US LLCs as corporations — no integration) · FBAR $10K USD threshold, Form 8938 $50K · RRSP / 401(k) / IRA cross-border treatment · transfer pricing T106 + s.247 documentation
Critical warning: A US LLC in the hands of a Canadian-resident shareholder = catastrophic double tax; the fix is C-corp or proper election + treaty benefits
Owner Compensation — the real math of salary vs dividend, and the TOSI red line
2026 Ontario top rates (salary 53.53%, eligible dividends 39.34%, non-eligible 47.74%, capital gains 26.76%) · CPP 5.95% + CPP2 4% · RRSP room 18% × earned income (2025 cap $32,490) · integration theory and real-world drift · TOSI excluded amounts (65+, 20 hr/week, ≥10% voting + 90% non-services) · shareholder loan s.15(2) trap + 5% prescribed rate · family trust LCGE $1,016,836 · 21-year deemed disposition
Key judgment: Don’t just compare nominal rates — model CPP/RRSP room, mortgage qualification, TOSI risk, and cash-flow flexibility together
CRA Audit Defense — 10 triggers, 90-day objection, and the VDP voluntary disclosure path
10 triggers (cash businesses, large GST refunds, lifestyle mismatch, industry benchmarks, 3-year losses, personal expenses through corp, unresolved shareholder loans, undocumented cross-border, crypto, round numbers) · 4 audit types (pre-assessment / office / field / criminal) · statutes of limitations: individual/CCPC 3 years, negligence 6, fraud unlimited, transfer pricing 7 · 5-stage process · 90-day objection to Tax Court of Canada · VDP three streams (general / limited / wash) · penalties (late 5% + 1%/mo, gross negligence 50%, criminal 200%)
Strategic principle: In a self-assessment system the burden of proof is on the taxpayer; VDP before CRA contacts you is always optimal — disclosing within 60 days of CRA contact = ineligible
SR&ED R&D Tax Credit — 2025 expansion: $6M limit, $2.1M refundable cap
2025 expansion (expenditure limit $3M→$6M, refundable cap $1.05M→$2.1M, capital expenditures eligible again, phase-out $15M-$75M) · three-question test (technological uncertainty / systematic investigation / advancement sought) · eligible expenditures (wages, materials, contracts, capital, proxy overhead 55%) · federal 35% refundable (CCPC qualifying portion) · Quebec up to 30% refundable (first $3M) · Ontario ITC 8% + ORDTC 3.5% · BC 10% · Alberta IEG 20% · Form T661 + 18-month deadline · free pre-claim consultation
Core opportunity: Combined effective rate 50–70% in Quebec, 40–50% in Ontario — Canada’s largest underused free-money source for founders, and most companies with technical work qualify
Who this series is for
- First-time Canadian incorporator — S6-1 and S6-2 systematically cover CCPC structure, SBD advantage, and GST/HST registration — every starting point of compliance
- Owner straddling salary vs dividend decisions — S6-4 goes beyond “which rate is lower” to model CPP, RRSP, mortgage, TOSI, and cash flow as one decision
- Cross-border founder (US LLC, dual citizen, ops on both sides) — S6-3 is minimum reading on LLC double-tax, FBAR obligations, and treaty benefits — one wrong structure can ruin years of work
- Tech / SaaS / manufacturing — SR&ED candidates — S6-6 unpacks the 2025 doubling; Quebec combined effective rate 50–70% is the most underused free-money source in Canada
- Recipient of a CRA letter — S6-5 maps 10 triggers, 5-stage process, 90-day objection window, and the three VDP streams so you know what to do next
- Multi-province operator — the full season compares ON / QC / BC / AB differences across taxes and credits, avoiding “one-province logic applied nationwide” blind spots
SiLaw take — tax compliance isn’t an “extra cost,” it’s structural compounding
Many newcomer entrepreneurs see “tax” as an “extra cost” beyond what the government collects. That’s a fundamental misreading. Every structural decision compounds for years: pick the wrong entity = decades of rate gaps; mishandle a US LLC = cross-border double tax that may never unwind; ignore the SBD’s capital phase-out = forfeit hundreds of thousands in annual deferral; ignore TOSI = spousal dividends taxed at the top marginal rate; ignore SR&ED = give up 50–70% of R&D cost as free refund every year.
The Canadian tax system is fundamentally self-assessment — the burden of proof always sits with the taxpayer. CRA does not have to prove you owe; you have to prove you don’t. That single principle turns “documentation” from administrative chore into your only real defense. VDP before CRA contacts you is always optimal; the same disclosure after contact costs ten times more.
Cross-border business and multi-jurisdiction Canadian operations require specialist teams, not generalist accountants. LLC traps, transfer pricing, TOSI, and SR&ED have outgrown the capacity of standard bookkeeping. The goal of this series is to make you an “informed client” — able to recognize the issue, ask the right question, and spend dollars where they actually solve the problem.
Disclaimer: this series reflects laws and policies as published in 2026. It is informational only and does not constitute legal or tax advice. Consult a licensed lawyer or a CPA for situation-specific advice.
📚 SiLaw General Index — Canadian Business and Tax Law
- Job-S1: Employment Fundamentals — contracts, minimum wage, overtime, termination checklist
- Job-S2: Work Permits and Residency — LMIA, PGWP, CRS, PSTQ
- Job-S3: Termination and Workplace Disputes — wrongful dismissal, severance, EI, workers’ comp, harassment
- Job-S4: Business and Startup Law — structure, registration, IP, financing
- Job-S5: Employer Compliance Operations — contracts, payroll, OHS, WC, Bill 96, Law 25
- Job-S6 (this series): Tax & Cross-Border — corporate tax, GST/HST/QST, US-Canada, compensation, CRA audit, SR&ED
