openaccountants Nunavut Territorial Income Tax -- Sole Proprietor Skill v1.0
General reference only. This skill is general tax/accounting reference material for AI-assisted workflows. It has not been reviewed for any specific person's facts, documents, elections, deadlines, residency, filing status, or local procedures. Do not rely on it to file, pay, amend, or take a tax position without review by a qualified professional in the relevant jurisdiction.
Section 1 -- Quick Reference
| Field | Value |
|---|---|
| Country | Canada -- Nunavut |
| Tax | Territorial income tax (NU428) |
| Currency | CAD only |
| Tax year | Calendar year |
| Primary legislation | Income Tax Act (Nunavut), S.Nu. 2001, c. 7 |
| Tax authority | CRA on behalf of Nunavut (Department of Finance, GN) |
| Filing portal | CRA My Account / NETFILE / EFILE |
| Form | NU428 -- Nunavut Tax; NU479 (Credits) |
| Filing deadline | June 15 (self-employed); payment due April 30 |
| Contributor | Open Accountants Community |
| Validated by | Pending -- Canadian CPA sign-off required |
| Skill version | 1.0 |
Nunavut Tax Rates (2025, indexed from 2024)
| Taxable Income (CAD) | Rate |
|---|---|
| 0 -- 54,707 | 4.00% |
| 54,708 -- 109,413 | 7.00% |
| 109,414 -- 177,881 | 9.00% |
| 177,882+ | 11.50% |
Nunavut has the lowest top marginal territorial rate in Canada at 11.50%.
Basic Personal Amount (BPA)
Nunavut BPA for 2025 is approximately $19,274 (indexed; verify against CRA / GN published indexation tables). Nunavut historically has had the highest territorial BPA in Canada.
Nunavut-specific credits
| Credit | Notes |
|---|---|
| Nunavut Cost of Living Tax Credit | Refundable. Two components: basic credit on first $12,000 of taxable income at 4%; supplementary credit on income $12,000–$65,000 with a phase-out. Reduces basic tax then refundable. |
| Nunavut Child Benefit (NUCB) | Refundable monthly benefit administered by CRA; not on NU428 directly but assessed from T1 net income. |
| Nunavut Political Contribution Tax Credit | Tiered, max $500 credit. |
| Nunavut Volunteer Firefighters' Tax Credit | $500 non-refundable. |
Conservative Defaults
| Ambiguity | Default |
|---|---|
| Unknown territory | Do not apply this skill |
| Inuit beneficiary under Nunavut Agreement | Apply standard rules; escalate any s. 87 / Nunavut Agreement question |
| Part-year resident | Escalate |
| Unknown bracket year | 2025 indexed figures |
Section 2 -- Required Inputs and Refusal Catalogue
Required Inputs
Minimum viable -- territory of residence on Dec 31 (must be Nunavut), federal taxable income (T1 line 26000), federal net income.
Recommended -- marital status, spouse income, children, Inuit beneficiary status under Nunavut Agreement, T1 line 23600 (for Cost of Living credit).
Ideal -- complete T1 data, prior NU428, GN credit assessments.
Refusal Catalogue
R-NU-1 -- Not Nunavut resident. "Province/territory is not Nunavut on December 31."
R-NU-2 -- Corporations/trusts. "Individual sole proprietors only."
R-NU-3 -- Part-year resident. "Escalate. Apply NU rates only to the period of Nunavut residency."
R-NU-4 -- Income earned on reserve under s. 87 Indian Act. "Escalate. Nunavut has no Indian Act reserves but specific Nunavut Agreement provisions may apply to Inuit beneficiaries."
Section 3 -- Transaction Pattern Library
Nunavut tax is computed from federal return data. Transaction classification is in ca-fed-t2125.
Section 4 -- Worked Examples
Example 1 -- Low Income
Input: Taxable income $22,000. Single.
Computation:
- Gross Nunavut tax: $22,000 × 4.00% = $880.00
- BPA credit: $19,274 × 4.00% = $770.96
- Basic NU tax before Cost of Living credit: $109.04
- Cost of Living basic credit ($12,000 × 4%) = $480.00
- Net NU tax: −$370.96 (refundable to taxpayer)
Example 2 -- Mid-Range
Input: Taxable income $85,000. Single.
Computation:
- $54,707 at 4.00% = $2,188.28
- $30,293 at 7.00% = $2,120.51
- Gross NU tax: $4,308.79
- BPA credit: $770.96
- Basic NU tax: $3,537.83
- Cost of Living basic ($480.00) plus partial supplementary; net NU tax approximately $2,800 (verify supplementary formula).
Example 3 -- High Income
Input: Taxable income $300,000. Single.
Computation:
- $54,707 at 4.00% = $2,188.28
- $54,706 at 7.00% = $3,829.42
- $68,468 at 9.00% = $6,162.12
- $122,119 at 11.50% = $14,043.69
- Gross NU tax: $26,223.51
- BPA credit: $770.96
- Basic NU tax: $25,452.55
- Cost of Living credit fully phased out.
Section 5 -- Edge Cases
EC-NU-1: Cost of Living Tax Credit supplementary formula
Verify the current NU479 supplementary formula from the GN Department of Finance before computing. Conservative default: report basic credit only and flag supplementary as [T2].
EC-NU-2: Northern Residents Deductions interaction
Federal Northern Residents Deductions (line 25500 of T1) reduce federal taxable income for residents of prescribed northern zones. ALL of Nunavut is a prescribed northern zone. Confirm the deduction is claimed federally before computing NU428; it will lower territorial taxable income proportionally.
EC-NU-3: Inuit beneficiary income from Nunavut Land Claims Agreement
Income arising directly from the Nunavut Agreement (e.g., royalty distributions to a Designated Inuit Organization) may have specific tax treatment. Escalate.
EC-NU-4: Mining and resource royalties
If T2125 includes Nunavut mining royalty income, escalate — interactions with the Nunavut Agreement royalty mechanism are complex.
Section 6 -- Self-checks
- Confirmed territory of residence is Nunavut on Dec 31.
- Federal taxable income reconciles to line 26000 of T1.
- Northern Residents Deductions checked for federal return.
- BPA applied at 4.00% (lowest NU bracket).
- Bracket boundaries match 2025 indexed thresholds.
- Cost of Living Tax Credit computed (refundable component identified).
- NU-specific credits (Volunteer Firefighter, Political) considered.
- Output flags any [T2]/[T3] item for reviewer judgement.
Section 7 -- Disclaimer
This skill and its outputs are provided for informational and computational purposes only and do not constitute tax, legal, or financial advice. Open Accountants and its contributors accept no liability for any errors, omissions, or outcomes arising from the use of this skill. All outputs must be reviewed and signed off by a qualified Canadian CPA familiar with Nunavut territorial tax before filing.
The most up-to-date, verified version of this skill is maintained at openaccountants.com.
Source: OpenAccountants — open tax Guides for AI, reviewed by named CPAs/CAs/EAs. Quality: source-cited draft. For always-current figures and named-accountant backing, connect the OpenAccountants MCP server (openaccountants-mcp).