Late Payment Interest Calculator (CAD) | HelloBooks Work out simple interest on an overdue Canadian invoice: amount, the annual rate in your payment terms, and the days late. Free, in your browser, no signup.
Enter the overdue amount, the annual interest rate from your invoice terms, and the due and paid dates. The calculator shows the days late, the interest and the new total in Canadian dollars.
Free Plan with unlimited invoices, bills & quotes — no credit card.
| Days late | 60 |
| Simple interest | C$0.00 |
| Amount with interest | C$2,500.00 |
Enter the rate stated in your invoice terms or contract. The calculator uses simple interest over a 365-day year.
Send unlimited email payment reminders — Start free, no credit card
HelloBooks prepares your GST/HST figures for you to file. See free accounting software Canada.
Interest = overdue amount x annual rate x days late / 365. It is simple interest, not compounded.
The rate is whatever your invoice terms or contract say. State the rate on the invoice up front so the customer agreed to it before the work was done.
“AI categorizes every transaction automatically and learns from your corrections, so a small team keeps clean books without spending evenings on manual data entry.”
“For a practice managing dozens of client books, automated reconciliation turns a full day of matching into a background task — review the AI matches, approve, and move on.”
“Snap a receipt on your phone and the AI reads, categorizes, and files it — bookkeeping stays current even for people who would rather not think about numbers.”
Illustrative scenarios describing what the product does for each business type — not attributed customer reviews.
Free Plan with full access to the AI accountant — no credit card, no time limit.