The IRS marked National Small Business Week in 2017—the first week of May—by issuing a series of tax tips and reminders to small-business owners. Here are six items covered during the week:

1. Sharing economy: The sharing economy, which includes everything from ride-sharing services to spare room rentals, is taking the nation by storm. The IRS cautions that income derived from these activities is generally taxable, though you may be entitled to offsetting deductions. If you're making money from such ventures, you'll need to pay estimated taxes and payroll taxes for any employees every quarter.

2. Worker credits: A business can claim the Work Opportunity Tax Credit (WOTC) for hiring workers from one of 10 target groups. Generally, the WOTC equals 40% of a worker's first-year wages for a maximum credit of $2,400. If you hire a disabled veteran, you may be eligible for a credit of as much as $9,600. You have to meet special certification rules to claim these credits.