What to do if you can't pay your tax bill (IRS.gov)

• Get a short-term payment plan.  If you owe more tax than you can pay, you may qualify for more time, up to 120 days, to pay in full. You do not have to pay a user fee to set up a short-term full payment agreement. However, the IRS will charge interest and penalties until you pay in full. It’s easy to apply online at IRS.gov. If you get a bill from the IRS, you may call the phone number listed on it. If you don’t have a bill, call 800-829-1040 for help.
• Apply for an installment agreement.  Most people who need more time to pay can apply for an Online Payment Agreement on IRS.gov. A direct debit payment plan is the hassle-free way to pay. The set-up fee is much less than other plans and you won’t miss a payment. If you can’t apply online, or prefer to do so in writing, use Form 9465, Installment Agreement Request. Individuals can use Direct Pay to make their installment payments. For more about payment plan options, visit IRS.gov.
• Check out an offer in compromise.  An offer in compromise, or OIC, may let you settle your tax debt for less than the full amount you owe. An OIC may be an option if you can’t pay your tax in full. It may also apply if full payment will cause a financial hardship. Not everyone qualifies, so make sure you explore all other ways to pay your tax before you submit an OIC to the IRS. Use the OIC Pre-Qualifier tool to see if you qualify. It will also tell you what a reasonable offer might be.

Additional IRS Resources:

• Tax Topic 202 – Tax Payment Options