The design: title in one corporation, risk in another
The structure is two corporations connected by nothing but a lease. The propco holds title to the real estate, carries the mortgage, and collects rent. The opco runs the business, signs the contracts, employs the staff, and takes on all the risks that come with customers, suppliers, vehicles and job sites. If the opco is ever sued past its insurance, the judgment is collected from what the opco owns, and the opco has only ever owned a tenancy.
Who owns the propco is its own decision, and it shapes everything downstream. The most common arrangement for an established business family is sister corporations under a common holding company: the holdco owns both the propco and the opco, surplus moves up as intercorporate dividends, and the family owns one thing instead of three. Propco shares can also be held personally, or partly by a spouse, which changes how rental profit is taxed and how the property passes on death. The right property ownership structure depends on where the purchase money comes from, who should own the growth, and what the estate plan needs, so it deserves a deliberate choice rather than a default.
One more design point matters at the start: the wall works in both directions. Just as business creditors cannot reach the building, the propco's lender cannot reach the business, unless guarantees are signed that reconnect them. Most of the maintenance work in these structures is keeping accidental reconnections from forming.
The lease is the wall: rent, HST and CCA
A signed lease at a defensible market rent is what makes the separation real rather than cosmetic. Without it, the opco occupies the building informally, the propco earns nothing, and a court or an auditor can treat the two companies as one intertwined operation. With it, the opco pays rent like any arm's-length tenant, deducts it as an operating cost, and the propco reports it as income against which it claims interest, property taxes, repairs and capital cost allowance.
HST runs through the middle of this. Commercial rent is taxable, so the propco registers, charges HST on every rent invoice, and remits it; the opco claims the same amount back as an input tax credit. Across the group the net cost is nil, but the compliance is real, and a propco that never registered or never invoiced is one of the most common defects we find when we take over a multi-entity group's books. Missed HST on intercompany rent is an expensive thing to fix years later, because the propco owes the tax whether or not it was ever collected.
Capital cost allowance is the quiet tax engine of the propco. The building is depreciated in the propco against rental income, which can shelter much of the rent from tax in the earlier years, with the trade-off that claimed CCA comes back as recaptured income when the building is eventually sold. How aggressively to claim CCA each year is a genuine planning decision, made against the propco's income, the group's use of the small business limit, and how long the family intends to hold the property.
One tax point reassures most owners: rent paid by an associated operating company out of its active business income is generally treated as active business income in the propco's hands rather than passive investment income. The associated group shares a single small business limit, so the first 500,000 dollars of the group's active income is taxed at Ontario's combined 12.2 percent small-business rate, allocated between the companies, rather than the rent being stranded at high investment-income rates.
Financing across the wall: the mortgage, the guarantees and the loan-back
The mortgage belongs in the propco's name, secured against the building, and the rent should be set so the propco can service its own debt. That is the clean version. The friction is that lenders like more covenant than a single-asset propco offers, so term sheets routinely ask for a guarantee from the opco, from the holdco, or from you personally. Every guarantee re-connects, to the extent of the guaranteed debt, exactly what the structure was built to separate, which is why guarantee terms deserve as much negotiation as the interest rate.
Ask for the narrowest guarantee the lender will accept: capped in amount, limited to the mortgage rather than all obligations, and reviewed at each renewal as the loan pays down and the building's equity grows. A guarantee that was reasonable at 75 percent loan-to-value is often releasable a few years later, but only if someone asks.
Financing also flows the other way. A propco with equity in its building is the family's cheapest source of business capital: it can refinance and lend the proceeds down to the opco. Done casually, that loan is an unsecured advance that ranks behind every trade creditor if the business fails, and the refinancing has moved money from the protected side of the wall to the exposed side. Done properly, the loan is papered with a written agreement and interest terms, secured against the opco's assets, and registered, so the propco stands near the front of the creditor line instead of the back. The mechanics and the tax consequences of these advances are covered in how intercompany loans affect a corporate group.
Running the group: intercompany transactions and consolidated cash flow
Every dollar that crosses between the companies needs a legal character, recorded the same way in both sets of books. Rent, loan advances, loan repayments, interest, management fees and dividends are all different things with different tax treatment, and an auditor or an opposing lawyer reads an unlabelled transfer as whichever character suits them. The bookkeeping standard for a clean group is simple to state: no transfer without a name, no name without paper. How each type of flow should be recorded, and what happens when the intercompany accounts drift, is set out in how intercompany transactions should be recorded in a real estate group.
| Flow between the companies | How it should cross the wall | Why it matters |
|---|---|---|
| Rent, opco to propco | Written lease, market rate, invoiced monthly with HST | The wall's main cash flow; informal occupancy undermines the whole structure |
| Mortgage payments | Paid by the propco from its own account | An opco paying the propco's lender directly blurs who owns what |
| Guarantees of the propco's debt | Avoided where possible; capped and reviewed where not | Each guarantee reconnects the entities to the extent of the debt |
| Loan, propco to opco | Written agreement, security taken over opco assets and registered | Unsecured advances rank last if the business fails |
| Management or admin fees | Only for services actually provided, invoiced, HST where applicable | Undocumented fees are routinely denied on audit |
| Dividends up to a common holdco | Directors' resolutions, paid between connected corporations | How surplus leaves the risk zone; paper proves when it left |
Owners often worry that splitting into two or three companies means losing sight of the whole. It should be the opposite. Legally the entities are separate; economically they are one operation, and the reporting should show both truths: entity-level statements that keep the wall intact, and a consolidated cash flow view that nets out the intercompany rent and loans so you can see what the group as a whole actually earned and spent. Banks reviewing the group ask for exactly this view, and an owner making decisions needs it monthly, not at year-end.
What the structure does for your estate plan
Separating the property also separates the succession questions, which is often worth as much as the creditor protection. A building tends to outlive the business that occupies it: the operating company may one day be sold, wound down, or passed to the child who runs it, while the propco keeps collecting rent from whoever the next tenant is. With the property in its own corporation, each asset can go to the right person on its own timeline, and propco shares can be frozen so future growth accrues to the next generation while you keep control.
This is the point where the structure stops being a bookkeeping arrangement and becomes business estate planning, and it is worth doing with a CPA in Ontario who works across both: the corporate structure, the will, and the shareholders' agreements have to tell the same story, or the plan fails at exactly the moment it is needed. It is also the stage where families with several properties decide how many corporations is enough, because each entity adds real annual cost, and groups that multiplied entities over the years sometimes tidy them later, as covered in should related real estate corporations be amalgamated.
What changes the answer, and how we set it up
Five facts decide how this structure should be built for you, and whether it is worth building at all:
- Where the property is today. Buying the next building in a fresh propco is simple; moving a building the opco already owns is a designed transaction with land transfer tax, HST and accrued-gain consequences that need planning before anything is signed.
- The guarantee load. If you and the opco will end up guaranteeing the propco's mortgage anyway, the protection is thinner than the org chart suggests, and negotiating the guarantees becomes the real work.
- How risky the operations are. Staff, vehicles, sites and the public raise both the odds the wall is tested and the value of building it early, before any claim exists.
- Who should own the growth. Personal, holdco or trust ownership of the propco changes the tax on rent, the estate outcome, and what happens on a future sale of either company.
- Whether the discipline will actually be kept. The structure is only as strong as its weakest year of paperwork; a group that will not invoice rent or document loans is safer staying simple.
We build and run these structures for property-owning business families across Mississauga and the GTA: the design and the reorganization as a defined-scope project under our corporate restructuring service, and the ongoing multi-entity books, HST, intercompany accounts and consolidated reporting as one coordinated engagement, the same work we do for landlords with corporate structures. The first step is a free 15-minute discovery call and an honest read of whether the wall you have, or the one you are considering, would actually hold.
