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Add British Columbia to tax visualizer #240

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20 changes: 19 additions & 1 deletion src/app/[lang]/(main)/tax-visualizer/page.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,19 @@ const PROVINCE_DATA: Record<string, ProvinceData> = {
{ range: "More than $220,000", rate: "13.16%" },
],
},
"british-columbia": {
name: "British Columbia",
bpa: "$12,932",
brackets: [
{ range: "First $49,279", rate: "5.06%" },
{ range: "$49,279 - $98,560", rate: "7.70%" },
{ range: "$98,560 - $113,158", rate: "10.50%" },
{ range: "$113,158 - $137,407", rate: "12.29%" },
{ range: "$137,407 - $186,306", rate: "14.70%" },
{ range: "$186,306 - $259,829", rate: "16.80%" },
{ range: "More than $259,829", rate: "20.50%" },
],
},
};

interface TaxCalculatorFormProps {
Expand Down Expand Up @@ -98,6 +111,7 @@ function TaxCalculatorForm({
>
<option value="ontario">{t`Ontario`}</option>
<option value="alberta">{t`Alberta`}</option>
<option value="british-columbia">{t`British Columbia`}</option>
</select>
<p className="text-sm text-gray-500 mt-1">
{t`More provinces coming soon.`}
Expand Down Expand Up @@ -293,7 +307,11 @@ export default function TaxCalculatorPage() {
and{" "}
<a
href={localizedPath(
province === "alberta" ? "/alberta" : "/ontario",
province === "alberta"
? "/alberta"
: province === "british-columbia"
? "/british-columbia"
: "/ontario",
i18n.locale,
)}
className="underline"
Expand Down
35 changes: 33 additions & 2 deletions src/lib/personalTaxBreakdown.ts
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Expand Up @@ -18,14 +18,15 @@ export interface PersonalTaxBreakdown {
}

// Federal spending categories with percentages (from existing Sankey data)
// Transfer to Ontario: 6.02%, Transfer to Alberta: 2.30%, Other Provinces: 11.18% (reduced from 13.48)
// Transfer to Ontario: 6.02%, Transfer to Alberta: 2.30%, Transfer to BC: 2.80%, Other Provinces: 8.38% (reduced from 11.18)
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@ron-ulitsky ron-ulitsky Dec 18, 2025

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Need to double check this, I think this was just an estimate from an LLM lol

const FEDERAL_SPENDING_CATEGORIES = [
{ name: "Retirement Benefits", percentage: 14.8 },
{ name: "Children, Community and Social Services", percentage: 5.1 },
{ name: "Employment Insurance", percentage: 4.5 },
{ name: "Transfer to Ontario", percentage: 6.02 },
{ name: "Transfer to Alberta", percentage: 2.3 },
{ name: "Transfers to Other Provinces", percentage: 11.18 },
{ name: "Transfer to British Columbia", percentage: 2.8 },
{ name: "Transfers to Other Provinces", percentage: 8.38 },
{ name: "Interest on Debt", percentage: 9.2 },
{ name: "Indigenous Priorities", percentage: 8.3 },
{ name: "Defence", percentage: 6.7 },
Expand Down Expand Up @@ -90,6 +91,32 @@ const ALBERTA_SPENDING_CATEGORIES = [
{ name: "Other", percentage: 8.7 },
];

const BC_SPENDING_CATEGORIES = [
{ name: "Health", percentage: 43.2 },
{ name: "K-12 Education", percentage: 12.7 },
{ name: "Other Appropriations", percentage: 9.7 },
{ name: "Children, Community and Social Services", percentage: 6.7 },
{ name: "Colleges and Universities", percentage: 4.5 },
{ name: "Finance and Debt", percentage: 3.4 },
{ name: "Children and Family Development", percentage: 3.1 },
{ name: "Interest on Debt", percentage: 3.0 },
{ name: "Municipal Affairs and Housing", percentage: 2.3 },
{ name: "Transportation", percentage: 1.9 },
{ name: "Forestry and Parks", percentage: 1.8 },
{ name: "Public Safety", percentage: 1.5 },
{ name: "Attorney and Solicitor General", percentage: 1.1 },
{ name: "Citizens' Services", percentage: 1.0 },
{ name: "Energy", percentage: 0.7 },
{ name: "Emergency Management", percentage: 0.6 },
{ name: "Water and Resource Stewardship", percentage: 0.4 },
{ name: "Fisheries and Agriculture", percentage: 0.4 },
{ name: "Indigenous Priorities", percentage: 0.4 },
{ name: "Environment", percentage: 0.3 },
{ name: "Tourism, Culture, and Sport", percentage: 0.3 },
{ name: "Economic Development and Trade", percentage: 0.3 },
{ name: "Other", percentage: 5.8 },
];

// Consolidated province configuration
const PROVINCE_DATA: Record<
string,
Expand All @@ -106,6 +133,10 @@ const PROVINCE_DATA: Record<
federalTransferName: "Transfer to Alberta",
spendingCategories: ALBERTA_SPENDING_CATEGORIES,
},
"british-columbia": {
federalTransferName: "Transfer to British Columbia",
spendingCategories: BC_SPENDING_CATEGORIES,
},
};

function formatCurrency(amount: number): string {
Expand Down
30 changes: 30 additions & 0 deletions src/lib/taxCalculator.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,9 @@ export const ONTARIO_BASIC_PERSONAL_AMOUNT = 12399;
// 2024 Alberta basic personal amount
export const ALBERTA_BASIC_PERSONAL_AMOUNT = 21885;

// 2025 British Columbia basic personal amount
export const BC_BASIC_PERSONAL_AMOUNT = 12932;

// 2025 Federal tax brackets
export const FEDERAL_TAX_BRACKETS: TaxBracket[] = [
{ min: 0, max: 57375, rate: 0.145 },
Expand Down Expand Up @@ -49,6 +52,17 @@ export const ALBERTA_TAX_BRACKETS: TaxBracket[] = [
{ min: 355845, max: null, rate: 0.15 },
];

// 2025 British Columbia provincial tax brackets
export const BC_TAX_BRACKETS: TaxBracket[] = [
{ min: 0, max: 49279, rate: 0.0506 },
{ min: 49279, max: 98560, rate: 0.077 },
{ min: 98560, max: 113158, rate: 0.105 },
{ min: 113158, max: 137407, rate: 0.1229 },
{ min: 137407, max: 186306, rate: 0.147 },
{ min: 186306, max: 259829, rate: 0.168 },
{ min: 259829, max: null, rate: 0.205 },
];

export function calculateTaxFromBrackets(
income: number,
brackets: TaxBracket[],
Expand Down Expand Up @@ -145,6 +159,17 @@ export function calculateAlbertaTax(income: number): number {
return Math.max(0, taxOnFullIncome - bpaCredit);
}

export function calculateBCTax(income: number): number {
// Step 1: Calculate tax on full income using progressive brackets
const taxOnFullIncome = calculateTaxFromBrackets(income, BC_TAX_BRACKETS);

// Step 2: Apply BPA as a credit (5.06% of BPA - lowest provincial rate)
const bpaCredit = BC_BASIC_PERSONAL_AMOUNT * 0.0506;

// Step 3: Subtract the credit from the calculated tax
return Math.max(0, taxOnFullIncome - bpaCredit);
}

export function calculateTotalTax(
income: number,
province: string = "ontario",
Expand All @@ -161,6 +186,11 @@ export function calculateTotalTax(
case "alberta":
provincialTax = calculateAlbertaTax(income);
break;
case "british-columbia":
case "british columbia":
case "bc":
provincialTax = calculateBCTax(income);
break;
default:
provincialTax = calculateOntarioTax(income); // Default to Ontario for now
provincialTax += calculateOntarioHealthPm(income);
Expand Down