RDTOH is a notional account that tracks refundable tax a corporation prepays on its investment income, refunded when it pays taxable dividends to shareholders.
To discourage using a corporation to defer tax on passive investments, Canada taxes a CCPC's investment income at a high rate, but part of that tax is refundable. It is tracked in the RDTOH account and refunded to the corporation when it pays out taxable dividends, restoring the integration between corporate and personal tax.
Since 2019 the account is split into eligible and non-eligible RDTOH, which affects the type of dividend that triggers the refund. RDTOH is a technical but valuable pool: overlooking it can mean leaving a tax refund unclaimed inside the corporation.
A corporation earns $10,000 of investment income and pays a high rate of tax on it, part of which goes into RDTOH. When it later pays a taxable dividend to the owner, a portion of that prepaid tax is refunded to the company.
Primary source
- Income Tax Act, s. 129(1) Dividend refund to private corporation
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Income up to the basic personal amount is effectively untaxed, because that credit offsets the federal tax on it, and each province and territory has its own equivalent amount. Both figures change every year with indexation, so look up the amount for the tax year in question. Other credits, such as the age amount, tuition, or the disability amount, lift the point where tax actually starts. Tax withheld at source below that point comes back as a refund.
Canada runs three systems. The federal GST is 5% for 2026 and applies nationally. Five participating provinces fold a provincial share into one harmonised rate: 13% in Ontario, 15% in New Brunswick, Newfoundland and Labrador and Prince Edward Island, and 14% in Nova Scotia since 1 April 2025. Others add their own tax to the 5% GST, giving 12% in British Columbia and Manitoba, 11% in Saskatchewan and 14.975% in Quebec. Alberta and the territories charge 5% only.
Tax exempt describes an amount or a transaction that tax does not apply to at all, which is different from a deduction or credit that merely reduces tax. Common examples are supplies that are exempt or zero-rated for GST/HST, investment income earned inside a TFSA, and specific receipts Parliament has excluded from income. Registered charities and non-profits can be exempt from income tax while still carrying filing duties. Exemption is never automatic; the rule must fit your facts.
There is no single percentage. Canada applies graduated federal rates plus a provincial or territorial rate, and each bracket taxes only the income falling inside it, so the marginal rate on your last dollar is higher than the average rate you actually pay. Credits such as the basic personal amount cut the result further. Check the federal and provincial brackets for the year you are filing on the CRA site, since they are indexed annually.
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Reviewed and fact-checked by Udit Gupta
Ex Big 4 — Ernst & Young, Deloitte · International & cross-border tax specialist · CPA Canada (In-Depth Tax Program) · Chartered accountant, ICAI & MIA
Udit Gupta has over 15 years of experience helping corporations and business owners with corporate structuring, corporate tax filing, bookkeeping, payroll, GST/HST, cross-border tax and CRA representation. Big 4 trained at Ernst & Young and Deloitte, and qualified as a chartered accountant in India and again in Malaysia, he founded his accounting practice in 2014 to serve entrepreneurs, startups and non-resident business owners across Canada. View full member bio.
The Institute of Chartered Accountants of India — member 521458 · Malaysian Institute of Accountants — member CA 44667 · Ex Big 4: Ernst & Young, Deloitte · CPA Canada (In-Depth Tax Program), completed 19 Dec 2023 · In-Depth GST/HST Part I, 12 Jul 2022 · Part II, 5 Jul 2023
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