It depends on how much your Social Security income is, and on your filing status. You didn't give either of those pieces of information.
If you are filing as single, head of household, or qualifying surviving spouse, your other income is $18,000, and your Social Security income is more than $14,000, some of your Social Security will be taxable. For example:
Social Security income: $16,000
Half of Social Security: $8,000
Other income: $18,000
Other income + half of Social Security = $26,000
That's more than $25,000, so part of your Social Security is taxable. In this example, $500 your Social Security would be taxable.
(This is assuming that you have no adjustments to income on Schedule 1.)
If you want to see the calculation for your specific situation, please give exact amounts of Social Security income and other income, and your filing status, or look at the Social Security Benefits Worksheet. You can find a blank Social Security Benefits Worksheet on page 32 of the IRS Instructions for Form 1040, and work through it yourself to see the calculation.
