Calculator GST Rebate Mortgage Impact
Bill C-4's federal GST rebate (up to $50,000, first-time buyers, new construction) can lower the price you actually finance. Model how a builder-credited rebate changes your loan-to-value, your CMHC insurance tier, and your monthly payment — not just your tax bill.
GST Rebate Mortgage Impact Calculator
Bill C-4's federal GST rebate (up to $50,000, first-time buyers, new construction) can lower the price you actually finance. Model how a builder-credited rebate changes your loan-to-value, your CMHC insurance tier, and your monthly payment — not just your tax bill.
Effective Purchase Price
$665,000
Loan-to-Value (no rebate credited)
90.5%
Loan-to-Value (rebate credited)
90.0%
CMHC Premium Rate (before)
4.2%
CMHC Premium Rate (after)
3.3%
CMHC Premium (before)
$26,607
CMHC Premium (after)
$19,751
Total Mortgage (before)
$660,107
Total Mortgage (after)
$618,251
Monthly Payment (before)
$3,328
Monthly Payment (after)
$3,117
Monthly Payment Savings
$211
Insurance Premium Savings
$6,856
CMHC Tier Shifted
Yes
Minimum Down Payment (full price)
$45,000
Minimum Down Payment (effective price)
$41,500
Estimates only, not a quote. The GST rebate amount should be confirmed with your builder or accountant — this tool does not calculate the rebate itself, only its effect on your mortgage once you enter it. Whether the rebate reduces your financed amount depends entirely on how your specific agreement of purchase and sale is structured; ask your builder directly. CMHC premium tiers include the 0.20% surcharge for first-time buyers using 30-year amortization. All payments use Canadian semi-annual compounding per the Bank Act. Consult a licensed mortgage professional before relying on these numbers.
All calculations use Canadian semi-annual compounding per the Bank Act. These results are estimates for educational purposes only and do not constitute financial advice. Speak with a licensed mortgage broker for advice specific to your situation.
API Access for Developers & AI Agents
This calculator is available as a free JSON API. AI agents, chatbots, and developers can send mortgage data and get instant results.
POST /api/calculate/gst-rebate-mortgage-impact
{
"purchasePrice": 700000,
"gstRebateAmount": 35000,
"downPaymentAmount": 66500
}
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Open →Estimates only, not a quote. The GST rebate amount should be confirmed with your builder or accountant — this tool does not calculate the rebate itself, only its effect on your mortgage once you enter it. Whether the rebate reduces your financed amount depends entirely on how your specific agreement of purchase and sale is structured; ask your builder directly. CMHC premium tiers include the 0.20% surcharge for first-time buyers using 30-year amortization. All payments use Canadian semi-annual compounding per the Bank Act. Consult a licensed mortgage professional before relying on these numbers.