Ontario Construction Holdback Calculator
Ontario's Construction Act requires a 10% statutory holdback on every payment under a construction contract. Enter your contract or progress payment amount to see the holdback and the amount payable now.
This calculator is for general information only. It isn't tax, legal, or accounting advice. Rates and rules change. Confirm current figures with the source below or your accountant before using these numbers for filing, billing, or contracts.
Rates current as of May 3, 2026.
Authoritative sources
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