Published: March 2008
Content last reviewed: September 2009
ISBN: 1-4249-2135-X (Print), 1-4249-2137-6 (PDF), 1-4249-2136-8 (HTML)
The purpose of an Ontario Ministry of Finance audit is to ensure taxpayers fulfil their tax obligations in accordance with the laws administered by the ministry, and to inform and educate taxpayers.
You may be chosen for an audit based on a number of reasons, including random and risk-based selection. Audits may also be the result of a referral or cross-reference from another audit or another jurisdiction.
Some audits are conducted from ministry premises (desk audits), while others involve on-site interviews and an examination of financial records and accounts (field audits).
Where there is more than one statute audit being scheduled, the taxpayer can request that these audits be coordinated, to help reduce the time and interruption to the taxpayer's business.
During an audit, the auditor will answer your related questions, explain requirements under the various provincial tax laws, and address any issues that require attention in addition to verifying that tax has been properly calculated and remitted.
The Ontario Ministry of Finance is committed to providing you with excellent customer service. Our service commitments can be found at ontario.ca/finance. To conduct a quality field audit in a timely manner, we will:
The above service standards also apply to desk audits, where appropriate.
The auditor may levy an interim assessment when part of the audit period may be lost due to the audit period time limits. The interim assessment represents the audit results for only a portion of the audit period. Upon completion of the audit, documentation will be provided indicating how the interim assessment forms part of the entire assessment.
If an audit assessment results in a tax liability, payment is due immediately. Interest is payable on any outstanding tax liability and is compounded daily until the assessment is paid in full.
Payment of the assessment may be made by cheque, payable to the Minister of Finance, and given to the auditor at the end of the audit. Alternatively, you may send your cheque to any Ministry of Finance Tax Office with a copy of the audit summary given to you by the auditor.
Payment is required even if you disagree with the assessment and intend to file, or have filed, a Notice of Objection.
If the audit results in a credit assessment, reducing your tax liability, you may use this credit to reduce your next remittance or you may request a refund of the credit balance.
If you disagree with your assessment, you can file a Notice of Objection with the ministry's Objections and Appeals Branch. This will result in an independent, informal review of your assessment. Notice of Objection forms can be obtained from the auditor, any Ministry of Finance Tax Office, or from the Internet at ontario.ca/taxappeals. A Notice of Objection must be filed within 180 days (for International Fuel Tax Agreement and International Registration Program objections, within 30 days) from the day the Notice of Assessment was mailed to you.
Ontario's tax system is based on voluntary compliance. The Ministry of Finance will not prosecute or impose civil penalties on any taxpayer who voluntarily discloses past non-compliance with provincial tax laws. Full payment of the tax liability with interest is required. In exceptional circumstances, posting of security and installment payments may be considered by the ministry.
A disclosure made after you have been contacted for audit or other compliance matters may not be treated as a voluntary disclosure.
For complete information, please obtain a copy of the ministry's Voluntary Disclosure bulletin or contact the ministry at 1 866 ONT-TAXS (1 866 668-8297).
You are required to keep records and books of accounts in Ontario or at such other place as may be approved by the Minister of Finance. Failure to comply with these requirements, as well as failure to produce records or information requested by the ministry, is an offence.
As a general rule, the ministry does not specify the records to be kept, however, books and records must:
The ministry's Tax Information Bulletin entitled Retention/Destruction of Books and Records is useful in determining which books and records may be destroyed.
To obtain additional information please contact the Ministry of Finance at 1 866 ONT-TAXS (1 866 668-8297), 1 800 263-7776 for teletypewriter (TTY), or visit our website at ontario.ca/finance.