Retainer Invoice Calculator

Calculate first-month (with optional proration and setup fee) and recurring monthly retainer invoice totals with provincial tax.

This tool is for informational purposes only. It is not accounting, tax, or legal advice. Always verify CRA, Revenu Québec, and provincial rules before invoicing.

Consulting & agencies

Retainer invoice amounts

Monthly retainer ($)Start dateSetup fee ($)Province / territoryCharge sales tax on this invoice?

Prorate first partial month

Lines — first invoice

Monthly retainer — $2,500.00

Line — recurring invoices

Monthly retainer — $2,500.00

Agencies and consultants

Monthly retainers should spell out what is included, the billing period, and tax treatment. Prorate when a client starts mid-month.

Create retainer invoices