My corporation paid extra tax on investment income. Does it come back?

Why your corporation paid the extra tax in the first place

The extra tax exists to take away the advantage of investing through a corporation instead of personally. Active business income earned by a CCPC gets the 12.2% combined Ontario rate on the first $500,000 precisely because Parliament wants business profits reinvested in the business. Investment income gets the opposite treatment: if interest, rent and capital gains inside a corporation were taxed at low corporate rates while you personally would pay up to the top marginal rate, every high earner would incorporate a portfolio and defer the difference indefinitely. So the Act taxes a CCPC's investment income upfront at close to the top personal rate, roughly 50% combined in Ontario.

Here is the part owners are rarely told: the system does not intend the corporation to keep bearing that rate. The design, called integration, aims for the same total tax whether you invest personally or through your company. To get there, a large portion of the corporate tax is charged only as a deposit. It sits in the RDTOH account and is returned to the corporation when the income is finally passed out to you as a taxable dividend, at which point you pay personal dividend tax and the two levels together land near what you would have paid earning the income directly. The corporation is a toll booth, not the destination.

The same logic explains why the rate feels so punishing in the early years of corporate investing. The upfront rate is deliberately pitched near the top personal bracket so there is no advantage to deferring inside the corporation; the system only evens out for owners who eventually pay dividends. It also explains a pattern owners notice on their assessments: profitable years with plenty of investment income and no dividends grow the RDTOH balance year after year, which is not a bookkeeping quirk but the system waiting for you to collect.

So the honest answer to the question you searched is: the extra tax is partly permanent and partly a refundable deposit, and whether the deposit ever comes back depends entirely on the corporation paying taxable dividends and filing on time. A corporation that accumulates investment income for decades without paying dividends is voluntarily leaving its deposit with CRA the whole time.

How much of the tax is refundable

Two streams feed the refundable account, and together they cover most corporate tax on passive income. First, the corporation's own investment income: interest, taxable capital gains, rents and similar aggregate investment income generate refundable tax equal to 30.67% of that income, which is most of the roughly 50% headline rate. The permanent, non-refundable portion is what remains, comparable to general corporate rates on business income. Second, portfolio dividends: when your corporation receives dividends from public companies or other corporations it is not connected to, those dividends are free of regular Part I tax but attract Part IV tax at 38.33%, and every dollar of Part IV tax is refundable.

A few boundaries keep expectations honest. Only the taxable half of a capital gain is income, so the refundable tax on a gain is 30.67% of the taxable half; the tax-free half goes to the capital dividend account instead, an entirely different and better exit. Dividends from a connected corporation, such as your operating company paying your holding company, generally attract Part IV tax only to the extent the payer received a dividend refund on those dividends, so refundable tax moves up the chain rather than being created twice. And investment income does not enjoy the small business rate at all; the small business deduction belongs to active business income only, which is why the line between the two matters so much and is drawn carefully in what counts as active business income.

Numbers make the shape clear. Say the corporation earns $100,000 of interest in Ontario: total corporate tax lands near $50,000, and about $30,670 of it is credited to RDTOH rather than gone. To pull that $30,670 back, the corporation needs to pay roughly $80,000 of taxable dividends, since each $100 of dividends releases $38.33 until the pool is empty. The permanent corporate cost, once the refund returns, sits far closer to ordinary business rates, but only for corporations that actually run the second half of the loop.

The two pools: eligible and non-eligible RDTOH

Since 2019 the account has been split in two, and the split decides which dividends release which refund. The point of the split is to stop a corporation from paying out low-taxed eligible dividends while recovering refundable tax that came from high-taxed investment income.

The ordering rule matters for sequencing. A non-eligible dividend pulls from the non-eligible pool first and can then reach into the eligible pool, but an eligible dividend can never touch the non-eligible pool. Pay an eligible dividend while your refundable tax sits in the non-eligible pool and you get no refund at all for it, plus your shareholders' eligible-dividend treatment burns GRIP. For most owner-managed corporations, whose refundable tax comes overwhelmingly from interest and capital gains, the practical rule is simple: it is non-eligible dividends that bring the money back.

Do not confuse the eligible pool with GRIP, a separate account that owners regularly tangle with it. GRIP measures how much of the corporation's income was taxed at high corporate rates and therefore how much dividend can be designated eligible, taxed more gently in shareholders' hands. Eligible RDTOH is a refund pool, nothing more. A corporation can hold GRIP with no eligible RDTOH, or the reverse, and dividend planning reads both accounts before deciding what to designate.

How the refund actually arrives

The refund is claimed on the T2, not applied for separately. The sequence in a normal year: the corporation declares and pays a taxable dividend to its shareholders, issues T5 slips, and files its T2 for the year the dividend was paid. On that return it computes its dividend refund as 38.33% of the taxable dividends paid, capped at the balance in the relevant RDTOH pool. CRA assesses the return and the refund arrives as money back or as a credit against the corporation's other balances. The account carries forward on the return's continuity schedules, and CRA's notice of assessment states the closing balances, which is where to look if you want to know what your corporation is currently owed.

Notice what the trigger is: taxable dividends paid, of any amount, to any shareholder. The dividend does not have to be paid in cash. A dividend declared and credited against what you owe the corporation works, which makes the dividend refund a standard tool for clearing a debit shareholder loan balance: the corporation books the dividend against the loan, you pick up the dividend on your personal return, and the corporation collects $38.33 of refund per $100 of dividend while the loan disappears before the shareholder loan inclusion rules bite.

Worth restating as a planning fact: the refund rate means roughly $2.61 of taxable dividends releases $1 of refund. A corporation holding a large RDTOH balance needs a correspondingly large dividend to flush it, and that dividend lands on someone's personal return. Which is why the refund question is never corporate-only; it is a joint calculation across the corporation and the shareholders, and it is the reason RDTOH planning belongs inside annual compensation planning rather than after it.

Timing has a cash-flow wrinkle worth planning around. The refund rides on the T2 for the year the dividend is paid, so a dividend paid in the first month of a fiscal year waits out that whole year plus the filing and assessment cycle before the refund lands, while the same dividend paid in the last month starts the clock almost immediately. Corporations flushing a large balance often time the dividend late in the fiscal year for exactly this reason.

How refunds get lost

The account does not expire, but refunds can be forfeited or wasted, and the ways are worth knowing before any of them happens to you.

• The three-year filing trap. The dividend refund for a year is only payable if the T2 for that year is filed within three years of the year-end. A dormant or behind-schedule corporation that finally catches up on old returns can find the dividends it paid in those years no longer bring the refund back. This is the single most expensive consequence of late corporate filings that owners have never heard of.
• Capital dividends and salary release nothing. Only taxable dividends trigger the refund. A capital dividend is tax-free and touches a different account; salary and bonuses are deductions, not dividends. A corporation that pays its owner exclusively through salary builds RDTOH on its investment income and never sees it again until the mix changes.
• The wrong pool. Eligible dividends paid while the refundable tax sits in the non-eligible pool return nothing, as above.
• Refunds netted, not received. Where the corporation owes other balances, HST, payroll arrears, prior-year tax, the refund is applied against them first. Not lost, but a hard surprise when the cash was earmarked.
• Winding up carelessly. On a wind-up or sale, RDTOH left unflushed by final taxable dividends is simply abandoned. The closing sequence of dividends is where the account is emptied deliberately.
• Holdco chains half-planned. When an operating company pays dividends to a holdco, its refund can be matched by Part IV tax in the holdco: refundable tax has moved, not returned. Nothing comes back to the family until the holdco itself pays taxable dividends to people. Chains like this need the last step planned, not just the first.

Planning the refund: what changes the answer

Whether to flush RDTOH this year, and with which dividends, turns on a short list of facts we check for every corporate client holding investment income:

• The balance in each pool, straight from the latest notice of assessment, because strategy differs when the balance is eligible versus non-eligible
• Your personal marginal rate this year and next, since the refund only nets out well when the personal dividend tax it costs is acceptable; a low-income year, a sabbatical or a spouse's bracket can make it cheap
• The GRIP balance, which decides whether any dividends can be designated eligible and taxed more gently in your hands
• Shareholder loan balances, because a dividend that clears a loan does two jobs at once
• The passive income grind, since the same investment income that builds RDTOH can be grinding the group's small business limit, covered in what the small business deduction is, and the two problems are managed together, not separately
• The corporation's cash needs, because a dividend by journal entry against a loan needs no cash, but a cash dividend to trigger a refund is real money leaving

The pattern that falls out for many owner-managed companies is a measured annual flush: pay enough non-eligible dividends each year to release the year's refundable tax, so the account never balloons and the personal tax lands in planned brackets rather than one brutal year. But that is a default, not a rule; owners with high salaries, TOSI-sensitive family shareholders or a sale on the horizon often sequence it differently. This is bread-and-butter work for a corporate tax planning CPA in Ontario: RDTOH, GRIP, the capital dividend account and your salary-dividend mix are one system, planned once a year in the rhythm described in corporate tax planning for owner-managed businesses and run for clients inside Tax Planning & Advisory. If your corporation's assessments show a five- or six-figure RDTOH balance and no one has ever proposed a plan for it, a free 15-minute discovery call will tell you what it would take to get your deposit back.