You are probably a partnership already
Under Ontario's Partnerships Act, two people carrying on business in common with a view to profit are a general partnership. No agreement, registration or intention is required; sharing the proceeds of shared clients is enough. That default has teeth. Every partner is personally liable for the business's obligations, including ones the other partner signed alone, and every dollar of profit lands on your personal returns in the year it is earned, at rates reaching 53.53%, whether you drew it or not.
For two freelancers splitting overflow work, the default is tolerable. It stops being tolerable at the first office lease, the first employee, and above all the first media commitment larger than either of you could cover from a personal account.
The media buy is the liability that matters
Agencies rarely get sued into ruin; they get caught holding a media commitment when a client fails to pay. Commit to platforms and publishers in your own name and rebill the client, and you owe the vendor regardless of what the client does. A client insolvency mid-campaign converts directly into your debt, and in a handshake partnership, into both partners' personal debt. A corporation puts that exposure where it belongs: on the company earning the margin for carrying it.
Be clear about the shield's limits. Personal guarantees survive incorporation, and directors stay personally liable for unremitted HST and payroll source deductions. Whether you buy media as agent or as principal also decides what you charge HST on, a contract question our agency tax services page treats in full.
Shares are where the co-founder deal gets real
For two founders we usually keep the structure simple: voting common shares in the agreed split, often in a separate class per founder so each can time dividends to their own tax year, with a shareholders' agreement doing the heavy lifting. A 50/50 split feels fair and manufactures deadlock, so the agreement needs a mechanism, a valuation formula or a shotgun clause, that resolves a stalemate without killing the company.
The agreement should settle four departures before they happen: death, disability, deadlock, and one founder simply leaving. A vesting or buyback-at-formula clause keeps someone who exits in year two from owning half of year ten. Family shareholders rarely help an agency: the business earns its income from services, so the TOSI excluded-shares exception is generally out of reach, a point our agency tax planning page covers alongside owner pay.
| Handshake partnership | Corporation | |
|---|---|---|
| Unpaid media vendor | Both partners personally liable | The corporation's debt, absent guarantees |
| Tax on profit | Personal rates up to 53.53%, drawn or not | About 12.2% on the first $500,000 retained |
| A founder leaves | Partnership dissolves by default | Shares move under the agreement |
| Adding an owner | Renegotiate everything | Issue or transfer shares |
The tax case arrives with retained profit
Incorporation saves real tax only when the agency earns more than the founders draw. Profit left in the corporation is taxed at about 12.2% on the first $500,000 of active income in Ontario, against personal rates that can be four times that, and the spread funds hires, a media float or a slow quarter. If you both strip every dollar out each year, integration means the corporation saves you little on tax; it still earns its keep on liability and on holding the contracts. The honest sequencing: incorporate for structure when commitments grow, and for tax when profit does.
Mechanics, and the HST restart
Incorporation for an agency runs: articles, Ontario or federal, with share classes drafted for your deal rather than copied from a template; a minute book and organizing resolutions; a corporate bank account open before the first client deposit lands. An existing book of business moves deliberately. Client contracts are assigned or re-signed with the corporation, and goodwill or work in progress can roll in under a section 85 election so the transfer itself triggers no tax.
HST does not follow you. The corporation is a new person with a new business number, and the partnership's registration closes with a final return. We register the corporation from day one even under the $30,000 small-supplier threshold: agency clients are businesses that recover the 13% anyway, and registration lets the corporation claim input tax credits on its startup costs. A payroll account follows with the first hire. For a two-person Mississauga shop still finding its shape, CPA Quick Support at $99/month keeps a CPA on call for the structure questions the first year keeps producing.
