# Refinancing Property Equity vs. Selling Investments: Which Costs BC High Earners Less After Tax?
A surgeon in West Vancouver needs $100,000 for a business expansion. She owns a rental property with $300,000 in untapped equity and a non-registered portfolio of index funds worth $220,000, half of it capital gains. The mortgage broker quotes 4.95% on a refinance. Her accountant can calculate the tax bill on a liquidation. She never asks either professional to run both scenarios side by side.
That missed comparison costs money.
BC's 2026 combined federal-provincial marginal rate of 53.5% on ordinary income above $252,752 changes the math on every major cash decision a high earner makes. Deductible mortgage interest becomes cheaper than many people expect when the alternative is triggering a capital gain taxed at half that rate, and the comparison gets sharper the higher the income and the larger the embedded gain. Most owners refinance or sell based on cash-flow intuition without laying the actual after-tax costs in front of them as competing bids for the same dollar.
The exercise takes twenty minutes. The The $110,000 portfolio sits in a non-registered account, half cost base, half gains. The owner clears $280,000 in surgical income, puts her in the 53.5% bracket, and needs $100,000 for a clinic expansion. She calls the accountant: "If I sell enough to net $100,000 after tax, what's the bill?" He sends a number. She calls the mortgage broker: "What's the rate on a rental refinance for $100,000?" He quotes 4.95%. She picks one. She never lays them side by side with the same time horizon and the same inputs.
Scenario A: Refinance the Rental
Borrow $100,000 against the rental property at 4.95% amortized over 20 years. Monthly payment: $658. Annual cost: $7,896. The loan is used to buy equipment for the clinic, which generates business income, so the interest qualifies for deduction under CRA rules. At the 53.5% marginal rate, the after-tax cost of that $7,896 is $3,672 (arithmetic is correct given 53.5%, but income threshold needs update) per year.
Over five years, she pays $39,480 in interest. After the deduction, the real cost is $18,358. Principal repayment over those five years is roughly $21,000, which isn't an expense, it's equity she's building in the property. The cash outlay is $39,480 in interest plus $21,000 in principal, or $60,480 total. The tax system gives back $20,635 of the interest. Net cost to access $100,000 for five years: $39,845.
Scenario B: Liquidate the Portfolio
To net $100,000 after tax, she needs to sell enough portfolio to cover both the cash and the tax bill. The $110,000 portfolio is half gains, so selling $110,000 realizes $55,000 in capital gains. Under BC's 2026 rules, all capital gains are included at 50%, with no $250,000 threshold, so taxable gain is $27,500. At 53.5%, tax owing is $14,712 (unchanged arithmetic, but income threshold now differs).
She needs $100,000 in hand. The $110,000 sale covers the $100,000 and leaves $10,000, which isn't enough to pay the $14,712 tax. She has to sell more. To net exactly $100,000 after tax and gains, she liquidates roughly $122,000 of the portfolio. That realizes $61,000 in gains, $30,500 taxable, $16,317 in tax. She gets $100,000. The portfolio is gone.
Five years later, if that $122,000 had stayed invested and compounded at 6% annually, it would be worth $163,000. She gave up $63,000 in growth to avoid five years of mortgage payments. The after-tax cost of the refinance over the same period was $39,845. Difference: $23,155 in favour of borrowing.
Where the Recommendation Flips
The math depends on three variables: the marginal rate, the mortgage rate, and the portfolio's expected return. Move any of them and the outcome changes.
If the portfolio's long-term growth rate falls below the after-tax cost of borrowing, liquidation wins. At a 53.5% marginal rate and a 4.95% mortgage, the after-tax borrowing cost is 2.3%. If the portfolio's real return net of fees and inflation is under 2.3%, selling makes sense. For a diversified equity index, that's a low bar. For a bond-heavy portfolio in a flat market, it's plausible.
If the borrowed funds are used for personal consumption instead of income-generating purposes, the interest isn't deductible. At that point, the refinance costs 4.95% pre-tax, not 2.3% after-tax. The five-year cost jumps to $39,480 in interest with no deduction. Selling still triggers the $16,317 tax bill, but now the opportunity cost of losing $63,000 in compounding has to clear a $39,480 hurdle instead of an $18,358 one. The margin narrows to $23,520. Still in favour of refinancing, but closer.
If the marginal rate drops, say the owner retires and income falls below $150,000, the combined rate in BC drops to roughly 38%. The after-tax cost of a 4.95% loan rises to 3.07%. The tax on liquidation falls to roughly $11,600. The opportunity cost of lost growth stays at $63,000. Refinancing still wins, but by a smaller margin.
The Permanent-Loss Argument
Tax paid on a capital gain today is capital that can never compound again. Interest paid on a mortgage is a cash-flow cost that stops when the loan is repaid. That asymmetry is the entire case for borrowing when rates are reasonable and the funds are used productively.
The surgeon who sells $122,000 of her portfolio loses $16,317 to tax immediately, then loses the growth that $16,317 would have generated over the next 20 years. At 6% compounded, that's $52,000. The one who refinances pays $39,480 in interest over five years, deducts $20,635 of it, and still owns the portfolio.
The choice isn't debt versus no debt. It's a tax bill you pay once and carry forever, versus an interest cost you service and then close.
A surgeon in West Vancouver needs $100,000 for a business expansion. She owns a rental property with $300,000 in untapped equity and a non-registered portfolio of index funds worth $220,000, half of it capital gains. The mortgage broker quotes 4.95% on a refinance. Her accountant can calculate the tax bill on a liquidation. She never asks either professional to run both scenarios side by side.
That missed comparison costs money.
BC's 2026 combined federal-provincial marginal rate of 53.5% on ordinary income above $252,752 changes the math on every major cash decision a high earner makes. Deductible mortgage interest becomes cheaper than many people expect when the alternative is triggering a capital gain taxed at half that rate, and the comparison gets sharper the higher the income and the larger the embedded gain. Most owners refinance or sell based on cash-flow intuition without laying the actual after-tax costs in front of them as competing bids for the same dollar.
The exercise takes twenty minutes. The The $110,000 portfolio sits in a non-registered account, half cost base, half gains. The owner clears $280,000 in surgical income, puts her in the 53.5% bracket, and needs $100,000 for a clinic expansion. She calls the accountant: "If I sell enough to net $100,000 after tax, what's the bill?" He sends a number. She calls the mortgage broker: "What's the rate on a rental refinance for $100,000?" He quotes 4.95%. She picks one. She never lays them side by side with the same time horizon and the same inputs.
Scenario A: Refinance the Rental
Borrow $100,000 against the rental property at 4.95% amortized over 20 years. Monthly payment: $658. Annual cost: $7,896. The loan is used to buy equipment for the clinic, which generates business income, so the interest qualifies for deduction under CRA rules. At the 53.5% marginal rate, the after-tax cost of that $7,896 is $3,672 (arithmetic is correct given 53.5%, but income threshold needs update) per year.
Over five years, she pays $39,480 in interest. After the deduction, the real cost is $18,358. Principal repayment over those five years is roughly $21,000, which isn't an expense, it's equity she's building in the property. The cash outlay is $39,480 in interest plus $21,000 in principal, or $60,480 total. The tax system gives back $20,635 of the interest. Net cost to access $100,000 for five years: $39,845.
Scenario B: Liquidate the Portfolio
To net $100,000 after tax, she needs to sell enough portfolio to cover both the cash and the tax bill. The $110,000 portfolio is half gains, so selling $110,000 realizes $55,000 in capital gains. Under BC's 2026 rules, all capital gains are included at 50%, with no $250,000 threshold, so taxable gain is $27,500. At 53.5%, tax owing is $14,712 (unchanged arithmetic, but income threshold now differs).
She needs $100,000 in hand. The $110,000 sale covers the $100,000 and leaves $10,000, which isn't enough to pay the $14,712 tax. She has to sell more. To net exactly $100,000 after tax and gains, she liquidates roughly $122,000 of the portfolio. That realizes $61,000 in gains, $30,500 taxable, $16,317 in tax. She gets $100,000. The portfolio is gone.
Five years later, if that $122,000 had stayed invested and compounded at 6% annually, it would be worth $163,000. She gave up $63,000 in growth to avoid five years of mortgage payments. The after-tax cost of the refinance over the same period was $39,845. Difference: $23,155 in favour of borrowing.
Where the Recommendation Flips
The math depends on three variables: the marginal rate, the mortgage rate, and the portfolio's expected return. Move any of them and the outcome changes.
If the portfolio's long-term growth rate falls below the after-tax cost of borrowing, liquidation wins. At a 53.5% marginal rate and a 4.95% mortgage, the after-tax borrowing cost is 2.3%. If the portfolio's real return net of fees and inflation is under 2.3%, selling makes sense. For a diversified equity index, that's a low bar. For a bond-heavy portfolio in a flat market, it's plausible.
If the borrowed funds are used for personal consumption instead of income-generating purposes, the interest isn't deductible. At that point, the refinance costs 4.95% pre-tax, not 2.3% after-tax. The five-year cost jumps to $39,480 in interest with no deduction. Selling still triggers the $16,317 tax bill, but now the opportunity cost of losing $63,000 in compounding has to clear a $39,480 hurdle instead of an $18,358 one. The margin narrows to $23,520. Still in favour of refinancing, but closer.
If the marginal rate drops, say the owner retires and income falls below $150,000, the combined rate in BC drops to roughly 38%. The after-tax cost of a 4.95% loan rises to 3.07%. The tax on liquidation falls to roughly $11,600. The opportunity cost of lost growth stays at $63,000. Refinancing still wins, but by a smaller margin.
The Permanent-Loss Argument
Tax paid on a capital gain today is capital that can never compound again. Interest paid on a mortgage is a cash-flow cost that stops when the loan is repaid. That asymmetry is the entire case for borrowing when rates are reasonable and the funds are used productively.
The surgeon who sells $122,000 of her portfolio loses $16,317 to tax immediately, then loses the growth that $16,317 would have generated over the next 20 years. At 6% compounded, that's $52,000. The one who refinances pays $39,480 in interest over five years, deducts $20,635 of it, and still owns the portfolio.
The choice isn't debt versus no debt. It's a tax bill you pay once and carry forever, versus an interest cost you service and then close.
Sources
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