Incorporating is one of the more consequential decisions a professional makes early in their career, and it's often driven by a single number: the small business tax rate on active business income is considerably lower than the top personal tax rate. That gap is real, but it's only useful to you if you actually leave money inside the corporation rather than pulling it all out as salary or dividends each year.
What actually changes
Once you incorporate, the corporation becomes its own taxpayer. It files its own return, keeps its own books, and pays you — the shareholder — through salary, dividends, or some mix of the two. That separation is where the tax deferral comes from: income taxed inside the corporation at the lower small business rate can be reinvested or left to grow before you ever draw it out personally.
It also means new ongoing obligations. Corporate tax filings, more involved bookkeeping, and — depending on your profession — a professional corporation structure that has its own rules about who can hold shares.
Questions worth asking first
Before signing incorporation paperwork, it's worth working through a few things with your accountant: how much income you actually plan to leave in the corporation versus draw out, whether a holding company makes sense alongside the operating corporation, what the ongoing compliance costs will look like, and whether your regulatory college has specific rules for professional corporations in your field.
Incorporation isn't wrong for most professionals reaching a certain income level — it's just not automatically right either. The answer depends on your income, your spending habits, and your longer-term plans, which is exactly the kind of conversation worth having before you sign anything, not after.