Tax planning is a year-round activity, but there are still some year-end strategies you can use to lower your 2018 tax bill. Here are six last-minute tax moves business owners should consider: Postpone invoices. If your business uses the cash method of accounting, and it would benefit from deferring income to next year, wait until early 2019 to send invoices. Accrual-basis businesses can defer recognition of certain advance payments for products to be delivered or services to be provided next year. Prepay expenses. A cash-basis business may be able to reduce its 2018 taxes by prepaying certain expenses — such as lease payments, insurance premiums, utility bills, office supplies and taxes — before the end of the year. Many expenses can be deducted up to...