The working answer: three buckets, each with its own logic
Corporate cash does three different jobs, and the amount that should stay inside the company is the sum of three separate decisions, not one gut feeling. We split every balance into an operating float, a safety reserve, and long-term surplus, because each bucket has a different owner-level question attached to it.
| Bucket | What it is for | How it is sized | The question it answers |
|---|---|---|---|
| Operating float | Payroll, rent, suppliers, tax instalments, HST | From your real payment cycle: what goes out before receivables come in | Can we always pay on time? |
| Safety reserve | A bad quarter, a lost client, a slow season, a surprise repair | A set number of months of fixed costs, chosen deliberately | How long could we run on zero revenue? |
| Long-term surplus | Profit the business does not need and you have not taken | Everything above the first two buckets | Is this cash cheaper inside or outside the corporation? |
The first two buckets are business questions and the third is a tax question. Most owners we meet have never drawn the line between them, so the whole balance feels vaguely necessary and nothing ever gets decided. Drawing the line is the useful act: once you can point at the surplus, you can plan it.
Sizing the float and the reserve: months of costs, not a round number
The float is set by your cash conversion cycle, not by comfort. Add up what leaves the account in a normal month: payroll and source deductions, rent, suppliers, loan payments, corporate tax instalments and the HST you are holding for the CRA, then look at how long customers actually take to pay you. A business that collects in 15 days can run a thinner float than one that waits 60 days on invoices while paying staff every two weeks. Money you are holding for the government, HST collected and payroll withholdings, is not your cash at all and should be treated as spoken for.
The reserve is a policy decision, and we make clients write it down. Three months of fixed costs is a common floor for a stable service business; six or more makes sense where revenue is concentrated in a few clients, the work is seasonal, or a single equipment failure can stop production. Concentration is the fact owners underweight: if your largest client is a third of revenue, your reserve is not really for a bad quarter, it is for the quarter after that client leaves.
Two more points before the tax discussion. First, a committed operating line of credit can stand in for part of the reserve, but only if it is in place before you need it; lenders extend credit on strength, not on distress. Second, a visible cash cushion helps you borrow: banks read the balance sheet, and a corporation holding real liquidity gets better answers on financing than one stripped to zero every year. The reserve is not idle, it is doing balance-sheet work.
Timing traps deserve their own line item. Corporate tax instalments, the year-end balance due two or three months after year-end, HST remittances and the personal tax you will owe next April on whatever you pay yourself all land on a calendar, and a float that ignores that calendar produces the classic owner emergency: a profitable company scrambling in March. We map the next twelve months of tax dates into the float before calling any dollar surplus.
Why surplus stays: the deferral is real money
Profit left inside an Ontario CCPC has usually paid corporate tax at 12.2 per cent on the first 500,000 dollars of active business income, while the top personal rate in Ontario is just over 53 per cent. That gap of roughly 40 points is the deferral: on every 100,000 dollars of profit you do not need personally, the corporation keeps about 40,000 dollars more working than you would hold after taking it as income at top rates. The personal tax is not avoided, it is postponed until the money comes out, but postponed tax is capital you can invest, use as working capital, or hold against the next opportunity in the meantime. Compounding on the deferred amount is the quiet engine here: a decade of growth on money that would otherwise have gone out in personal tax is often the largest single benefit of being incorporated at all.
The deferral has a boundary worth naming: it applies to active business profit taxed at the small business rate. Profit above the 500,000 dollar small business limit is taxed at the general corporate rate, where the gap to personal rates is smaller but still real.
That is the honest case for leaving cash sitting in the company: if you do not need it to live on, taking it out at a high personal rate just to park it in a personal account is usually the worst of the options. The deferral is strongest when your personal income is already in the top brackets and weakest when your personal income is low, because money taken out in a low-income year faces modest personal tax anyway. This is why the question is never just how much cash, but how much cash this year, and it connects directly to the salary versus dividends decision: your compensation plan is the valve that sets the level.
One caution on where the surplus sits. Cash accumulating in the operating company is exposed to the operating company's risks: lawsuits, creditor claims, a bad contract. Once the surplus is genuinely long-term, many owners move it up to a holding company so it is no longer standing behind the operating business's liabilities. That is a structuring decision with its own steps and its own tax rules, and it does not change the passive income math below, but it changes who can reach the money.
When sitting cash starts costing you: passive income and refundable tax
Surplus cash does not stay cash; it becomes investments, and the income those investments earn is where the tax cost of hoarding shows up. Two mechanisms matter. First, investment income inside a CCPC, interest, rent, portfolio dividends and the taxable half of capital gains, is taxed at roughly 50 per cent combined. Part of that is refundable tax the corporation gets back when it pays you taxable dividends, so the system is designed to be rough on corporations that earn investment income and never pay their shareholders. Holding investments while paying nothing out means prepaying tax and leaving the refund on the table.
Second, and more important for a profitable business: once the corporate group's passive investment income passes 50,000 dollars in a year, the next year's small business deduction starts to shrink, five dollars of limit lost for every dollar of investment income over the line, gone entirely at 150,000 dollars. At that point your active business profit is taxed at the general corporate rate instead of 12.2 per cent, which is exactly the reader's fear: the investments really can push up the tax on the business income. The mechanics, the thresholds and what to do in the year before it bites are covered in how passive investment income affects the small business deduction.
Put a number on when this becomes relevant: at interest-like yields, it takes roughly a million dollars of invested surplus to generate 50,000 dollars of passive income, and capital gains count only when realized and only by half. A corporation holding 200,000 dollars of surplus is nowhere near the problem. A corporation holding several million, or one that is about to realize a large gain, is planning around it every year. The threshold is measured across associated corporations, so moving the portfolio to a holding company does not reset it.
How surplus leaves: the exits, and the one that is not an exit
Cash leaves a corporation properly in a small number of ways, and each has a cost and a use. Salary is deductible to the corporation, creates RRSP room and CPP entitlement, and gives you the reported income lenders want to see, which matters more than owners expect when a mortgage is coming; we cover that side in how salary and dividends affect mortgage qualification. Dividends are simpler to pay and can release the corporation's refundable tax as a refund when the timing is right. Repaying money the corporation owes you, a shareholder loan you made to it earlier, comes out with no tax at all and is often the first exit we use. And where the corporation has realized capital gains in its history, part of the surplus may be payable as a tax-free capital dividend.
The exit that is not an exit is borrowing from the company. Taking cash out as a loan to yourself feels free, but a shareholder loan that is not repaid within the allowed window is added to your personal income in the year you took it, and the repay-and-reborrow pattern is specifically caught. If part of your balance is already sitting in a shareholder loan account, read how shareholder loans become taxable before year-end, not after.
The right mix of exits is a yearly decision, not a standing order. In a year with high corporate profit and low personal income, taking more out is cheap. In a year where you sold an asset and the refundable tax account is full, a dividend carries a refund with it. In a year you are signing a personal mortgage, reported salary may be worth more than the tax it costs. This sequencing is the core of owner-level planning, and it is the standing work a corporate tax planning CPA in Ontario does for owner-managed companies: not one clever move, but the same valves adjusted every year as the facts change.
What changes the answer, and how we keep it decided
Six facts move the number more than anything else. When one of them changes, the cash answer changes with it:
- Your operating cycle and client concentration: slow receivables and one dominant client argue for a larger float and reserve.
- Your personal cash needs and personal tax bracket: the deferral only helps on money you genuinely do not need to live on.
- How much investment income the surplus already earns: approaching 50,000 dollars of passive income across the group changes next year's corporate rate.
- The corporation's refundable tax balance: a full account argues for taxable dividends that carry refunds out with them.
- Financing on the horizon: an upcoming mortgage or business loan can make reported salary and a strong balance sheet worth paying tax for.
- Risk sitting in the operating company: long-term surplus exposed to operating liabilities argues for moving it, not just keeping it.
Our approach is to size the float and reserve once a year with you, then run the surplus decision as part of the annual compensation and distribution plan inside Tax Planning & Advisory: how much stays, how much comes out, and through which exit. If your corporation is holding a balance that has never been split into those three buckets, a free 15-minute discovery call is enough to tell you whether the surplus is working for you or quietly building next year's tax problem.
