The estimator has entries for your information as of the beginning of the year, plus forms for each month to enter any changes.
For each month that you incurred a change, enter the changes to the premium (if you switched plans, added or removed a family member), your income, or your family members. The tool will make a revised estimate of the credit based on the changes and show the results in the Summary section.
For each new family member, you need to specify the member's age in the drop down list. You only need to specify the age once: either at the beginning of the year or in the month when you added the member to the family.
For each family member, you need to specify if they are enrolled in a qualifying health plan through the Marketplace and are not eligible for other coverage such as employer-sponsored or government-sponsored coverage.
There are four steps to using the estimator: Select the tax year, enter your beginning of year information, enter any changes during the year, and the year end summary.
Step One - Tax Year
Select the tax year. If you need to change the year after you already started Step Two, you will need to clear all the information you entered by clicking "Clear Everything."
Step Two - Entering Your Information
Enter your information as you expect it to be for the year.
Your estimated monthly household income
Enter your household's total monthly modified adjusted gross income. Optionally, you may use the worksheet that will group your income by type.
Your family size and age of family members.
This includes yourself, your spouse, and your dependents.
The state and county where you live.
This is used to look up the cost of the benchmark plan for your area.
If you live in a state with its own Marketplace, enter the benchmark plan amount.
Monthly total health insurance premiums.
The monthly premium for your health plan before the advance payments of the premium tax credit or other subsidies.
Monthly Advance Premium Tax Credit
The amount of advanced premium tax credit payments the Marketplace sends monthly to your insurer.
Step Three - Changes in Circumstances
Select below the month that change(s) occurred that could impact your premium tax credit. Enter the change in that month. Any changes you input for that month are carried forward to the future months.
If your premiums change because you switch plans or add or remove a family member.
Change in monthly income.
Changes in your family size. For new members, specify their age and if they are enrolled in a qualifying health plan through the Marketplace and are not eligible for other minimum essential coverage (such as coverage offered through an employer).
Remember, this estimator doesn't estimate the premium tax credit changes when you move to a different ZIP code or you marry or divorce.
Step Four - Results Summary
An estimate of your revised premium tax credit will show here, taking into account any changes you entered.
If you do not update the Marketplace with your changes during the year, an estimate of the difference will show as well. If your premium tax credit though the Marketplace or Exchange doesn't match the advance payments you receive, you may either be eligible for a refund or have to repay part of the advance payments.