How Much Retained Earnings Should a Small Corporation Keep for Future Tax Payments in Canada

Disclaimer: This article is general information only. It is not tax, legal, or accounting advice. Rates, thresholds, and deadlines change, so confirm current requirements with the Canada Revenue Agency (CRA), your provincial or territorial tax authority, or a qualified Canadian professional.

Introduction

Many Canadian small-business owners ask how much profit to “keep back” for taxes. The honest answer is that there is no single CRA-mandated percentage. The right amount depends on your income, province, business structure, and how you pay yourself. This article explains how to size a tax reserve for a Canadian-controlled private corporation (CCPC), where federal and provincial rules differ, and what to verify before relying on any number.

Understanding Retained Earnings

What retained earnings are

Retained earnings are the cumulative after-tax profits a corporation has kept rather than paid out as dividends. They appear in the equity section of the balance sheet.

Retained earnings are not cash. A corporation can show large retained earnings while its bank account is nearly empty, because profits may be tied up in receivables, inventory, equipment, or debt repayments. To pay future taxes, you need cash set aside, not just a retained earnings balance. Many owners confuse the two.

Role in financial health

Retained earnings fund growth, absorb losses, and support a buffer for obligations like income tax instalments. Because corporate tax is calculated on taxable income, a profitable year can create a tax bill even when cash is tight.

Federal versus provincial considerations

• Federal: The CRA administers the federal corporate income tax under the Income Tax Act, including the small business deduction (SBD) for eligible CCPCs.
• Provincial and territorial: Each province and territory sets its own corporate rate, including its own small business rate. For most provinces and territories, the CRA collects provincial corporate tax on the same T2 return.
• Exceptions: Quebec and Alberta administer their own corporate income tax. Quebec corporations file with Revenu Québec, and Alberta corporations file with Alberta Treasury Board and Finance, in addition to the federal T2.

Why Retained Earnings Matter for Tax Payments

Setting aside cash from profits smooths out the timing gap between earning income and paying tax. It helps you avoid scrambling for funds when instalments or a balance owing come due. It also supports tax planning decisions, such as how much to pay out as salary or dividends.

Federal obligations to plan for

• T2 return: This is generally due six months after the fiscal year-end.
• Balance owing: This is generally due two months after year-end. Some CCPCs qualify for three months. Verify eligibility with the CRA.
• Instalments: Corporations generally pay monthly. Certain small CCPCs may qualify for quarterly instalments. Confirm the current eligibility conditions with the CRA.
• Interest and penalties: The CRA charges interest on late or insufficient payments and may assess late-filing penalties.

Money that is not yours to retain

Some amounts should never be treated as ordinary retained profit:

• GST/HST collected: You hold this on behalf of the government. Registration is generally required once you exceed the small supplier threshold (currently $30,000 over four consecutive calendar quarters). Verify the threshold and your reporting period with the CRA.
• PST and QST: British Columbia, Saskatchewan, and Manitoba administer their own PST. Quebec’s QST is administered by Revenu Québec. Registration and remittance rules differ by jurisdiction.
• Payroll source deductions: Employee income tax, CPP, and EI withheld, plus the employer’s share of CPP and EI, must be remitted to the CRA on your assigned schedule. Quebec employers also deal with Revenu Québec for Quebec income tax and the QPP. Check your remitter type and due dates.

Keep these amounts in a separate account or track them clearly so they are not spent as operating cash.

Calculating the Reserve You Need

Step 1: Review past tax liabilities

Gather your last two or three T2 returns and notices of assessment. Record the federal tax, provincial or territorial tax, instalments paid, and any balance owing. Look for patterns, such as whether you consistently owed a large balance, which suggests your instalments were too low.

Step 2: Estimate future tax liabilities

Project your taxable income, not just accounting profit. Taxable income often differs from net income because of capital cost allowance (CCA), non-deductible meals, and other adjustments. Then apply:

• The federal rate that applies to you. CCPCs may qualify for the SBD on up to $500,000 of active business income, with the general rate applying above that. Verify the current rates and the business limit.
• Your province’s or territory’s rate for the same income. Provincial small business rates and limits vary.
• Possible reductions to the SBD if your adjusted aggregate investment income exceeds the legislated threshold, or if your associated corporations share the business limit. Confirm the current rules with the CRA.

Step 3: Set the reserve and a buffer

A practical approach is to reserve the estimated combined corporate tax, then add a buffer. A buffer of 10 to 20 percent is a common rule of thumb among planners, not a CRA requirement. It covers reassessments, revenue surprises, and timing differences. Your own buffer should reflect how volatile your income is.

Also consider the owner’s personal tax. Salary has source deductions withheld, but dividends do not, so you may owe personal tax at filing time. If you take shareholder loans, review the rules on repayment timing and potential income inclusion, and check with your accountant.

Sample Retained Earnings Calculation Table

The figures below are hypothetical. They assume a CCPC with active business income under the business limit, taxable income equal to net income before tax,

Disclaimer: The content on this website is AI-generated for informational and educational purposes only. It does not constitute certified financial, tax, or legal advice. Because accounting standards and local tax codes vary frequently, readers should consult a qualified accountant or certified professional before making any financial decisions based on this material.