Health care coverage gaps happen. Whether because of job loss or an extended sabbatical between gigs, you may find yourself without health care for a period. Here are some tax consequences you should know about, as well as tips to fix a coverage gap.

Coverage gap tax issues

You will have to pay a penalty in 2018 if you don't have health care coverage for three consecutive months or more. Last year the annual penalty was equal to 2.5 percent of your household income, or $695 per adult (and $347.50 per child), whichever was higher. The 2018 amounts will be slightly higher to adjust for inflation.

While the penalty is still in place for tax years 2018 and earlier, it is eliminated starting in the 2019 tax year by the Tax Cuts and Jobs Act.

Three ways to handle a gap

There are three main ways to handle a gap in health care coverage:

COBRA. If you're in a coverage gap because you've left a job, you may be able to keep your previous employer's health care coverage for up to 18 months through the federal COBRA program. One downside to this is that you'll have to pay the full premium yourself (it's typically split between you and your employer while you are employed), plus a potential administrative fee.

Marketplace. You can enroll in an insurance marketplace health care plan through Healthcare.gov or your state's portal. Typically you can only sign up for or change a Marketplace plan once a year, but you can qualify for a 60-day special enrollment period after you've had a major life event, such as losing a job, moving to a new home or getting married.

Applying for an exemption. If you are without health care coverage for an extended period, you may still avoid paying the penalty by qualifying for an exemption. Valid exemptions include unaffordability (you must prove the cheapest health insurance plan costs more than 8.16 percent of your household income), income below the tax filing threshold (which was $10,400 for single filers below age 65 in 2017), ability to demonstrate certain financial hardships, or membership in certain tribal groups or religious associations.