Which of the following is crucial for tracking large purchases?

Recording the purchase and keeping receipts is crucial for tracking large purchases because it creates a reliable record of the transaction. This method provides tangible proof of the expenditure, which is essential for both accounting purposes and budgeting. Proper documentation ensures that the purchase can be referenced later if needed, whether for reconciling accounts, verifying expenses during audits, or simply for personal expense tracking.

Additionally, keeping receipts can help manage warranties or return processes effectively. This level of organization is particularly important in environments where large expenditures must be justified or explained to higher authorities. The other options may not offer the same level of reliability: maintaining a personal log might not provide the necessary evidence, asking colleagues for inputs is often subjective, and noting down on a sticky note lacks permanence and can easily be lost or overlooked.