For small businesses, managing payroll can be one of the most arduous tasks. Adding to the burden earlier this year was adjusting income tax withholding based on the new tables issued by the IRS. (Those tables account for changes under the Tax Cuts and Jobs Act.) But it’s crucial not only to withhold the appropriate taxes — including both income tax and employment taxes — but also to remit them on time to the federal government. If you don’t, you, personally, could face harsh penalties. This is true even if your business is an entity that normally shields owners from personal liability, such as a corporation or limited liability company. The 100% penalty Employers must withhold federal income and employment taxes (such as Social Security) as well as...