Incorporating a cross-border flipping business: one entity, or one per project?

Entity per project or one master entity?

Serial flippers usually land on a hybrid: a durable master structure for the business, with a fresh limited partnership for any project that carries outside investors or outsized risk. A construction site is the riskiest asset most investors ever own, and the entity question is really about how far one bad project can spread.

The Canadian corp + US LP build

The build that works for Canadians is a Canadian corporation as a partner in a US limited partnership — never a US LLC, which the CRA treats as a corporation and double-taxes; our US house flipping tax guide for Canadians covers that trap in depth. The LP holds title and takes the construction risk; the corporation supplies capital, banks the after-tax profit, and redeploys it into the next project without a personal-rate tax hit first.

Be clear-eyed about the rates: flip profit is active business income, not capital gains, in both countries. The US taxes it first as effectively connected income, with an 1120-F and branch profits tax for the corporate partner — the treaty caps branch tax at 5 per cent and exempts the first C$500,000 of cumulative branch profits. Canada then taxes the same income on the T2 with foreign tax credits. And because the small business deduction only applies to a business carried on in Canada, US flip profits sit at the general corporate rate — the corp's advantage is deferral and liability control, not a lower rate.

GST/HST: the Canadian side flippers forget

Your Canadian corporation can have GST/HST obligations even when every flip is in Arizona. The sale of US real property is outside the GST/HST system, but the corporation's Canadian-side activity is not.

• Registration: once taxable supplies — project management fees, consulting, any Canadian flips — pass the $30,000 small-supplier threshold over four consecutive quarters, the corp must register and file GST34 returns.
• Canadian flips are different animals: a substantially renovated house in Canada is generally a taxable sale of new housing, with GST/HST on the price. Do not carry US assumptions home.
• No ITCs on US costs: input tax credits only offset GST/HST actually paid; US contractor invoices carry none.

The two-country compliance calendar

A corp-plus-LP flipper runs one filing calendar across two countries, and the deadlines interlock — miss the partnership return and every downstream return is late too. For a calendar-year structure, the recurring spine looks like this:

• March 15: Form 1065 for each LP, with K-1s to the partners (extendable to September).
• Mid-June: 1120-F for the Canadian corporation with no US office, and 1040-NR for any individual partners.
• T2 season: six months after the corp's year-end to file, with the balance owing two or three months after year-end — earlier than most owners expect.
• Per state: income or franchise tax returns, annual reports, and registered agent renewals for every state you flip in.
• Per sale: FIRPTA withholding at 15 per cent of gross price unless a Form 8288-B certificate is approved before closing — on a flip's thin margin, the certificate is usually worth filing every time.

When to stay simple

A first flip does not need this machine. One project, your own money, modest scope — buying personally, or through a single LP if there is a partner, keeps costs proportionate while you find out whether flipping is your business or your experiment. The corp-and-LP build pays for itself with repeat volume, outside investors, or profits you want compounding at corporate rates instead of personal ones. AnalytIQ designs the structure, registers it in both countries, and runs the whole calendar for a fixed fee quoted after a discovery call.