South Bow sees Carney's mega deduction as funding lever for $3-billion Prairie Connector

The capital cost of building a pipeline in Canada has always been a tax problem. South Bow Corp. spent billions on steel, compressors, and land rights. Under standard depreciation rules, it writes off 4% of that per year, $120 million annually for the first 25 years. The company books the expense slowly. The cash goes out the door immediately.

Mark Carney's proposed "Mega-Deduction" changes that arithmetic. Qualifying projects can deduct capital costs immediately for approximately 65% of eligible asset categories. For South Bow, that means zeroing out taxable income the year the pipeline goes into the ground, preserving substantial cash that would otherwise go to the Canada Revenue Agency over the next decade. That difference is large enough to matter for how the project gets funded.

The hybrid model South Bow is building

South Bow CEO said the company is evaluating multiple financing paths for the pipeline expansion, a proposed project designed to move more crude to U.S. Gulf Coast refineries. One involves selling a minority stake to private equity fund managers. Another leans on internal cash flow from existing pipelines. The Mega-Deduction sits between them as a de-risking mechanism.

Here's the structure. Private equity firms typically require a 12-15% internal rate of return on pipeline projects. That return assumption bakes in a tax drag: the sponsor pays corporate tax on project income, which reduces distributable cash. If South Bow can eliminate most of that tax in the early years through accelerated depreciation, the same project cash flow supports a higher equity valuation. The private equity partner gets its return faster. South Bow sells less of the company to raise the same capital.

The arithmetic works because pipelines generate stable, contracted revenue from day one. Unlike an oil producer, which faces commodity price risk, South Bow earns a regulated toll per barrel moved, regardless of what crude sells for downstream. The risk for equity partners is volume, whether enough producers ship oil to fill the pipe. The Mega-Deduction changes the after-tax cash available to service debt and pay distributions, which is what equity investors price.

The timing problem private equity solves

Even with the tax break, South Bow still faces a capital gap. The company spun out of TC Energy on October 1, 2024 with a portfolio of existing pipelines, but it does not have $3 billion sitting idle. Borrowing the full amount would push its debt-to-EBITDA ratio above 5x, which credit rating agencies would punish. Selling equity to the public market would dilute existing shareholders at a discount, because pipeline expansions do not generate cash until they are operational.

Private equity changes the sequencing. A fund commits capital upfront in exchange for a minority stake and a preferred return structure. South Bows builds the pipeline using that capital plus project debt. The Mega-Deduction shelters the project's early taxable income. By year three or four, when the pipe is at full utilization, South Bow's cash flow is strong enough to buy back the private equity stake at a pre-agreed formula, or the fund exits via secondary sale to another institutional investor. The fund gets its 12-15% IRR. South Bow gets the project built without over-leveraging its balance sheet or destroying shareholder value through a poorly timed equity raise.

The model works as long as oil production in the Western Canadian Sedimentary Basin continues to exceed pipeline egress capacity, which it has for most of the last decade. When producers face bottlenecks, they sell crude at a discount, sometimes $15-20 per barrel below U.S. benchmark prices. That price differential creates obvious demand for additional pipeline capacity, which is why South Bow is confident the pipeline will fill.

The Mega-Deduction does not create the project economics. It adjusts the speed at which equity capital gets repaid and improves the terms under which South Bow can raise it. For a company built on regulated, contracted pipelines, that adjustment is the difference between needing outside capital and being able to afford it on reasonable terms.