Accruals are used in accrual accounting to track revenue that is recognized in the period that it's earned in, not when payment is received, and to track expenses (costs) that are recognized when they occur, not when payment is made. Allocations are used to distribute amounts across multiple ledger account combinations. They help to ensure that expenses or revenue is charged to the correct object in accounting. By using allocations and accrual features in Dynamics 365 Finance, financial leaders can create rules, configure source and destination, and schedule the task only once, the rest is taken care of by Finance.