Typically, your initial mortgage payment occurs roughly two weeks after legal completion. The specific date depends on the lender and direct debit setup time. This first payment covers interest for the days between completion and month-end, plus the entire next month. Completing near month-end results in a smaller initial payment compared to an early-month completion. It's advisable to budget for a double mortgage payment for the first month as a precaution; a topic our advisers will discuss with you.