When using the taxcaster tool (https://turbotax.intuit.com/tax-tools/calculators/taxcaster/), enter your Net Operating Loss (NOL) as negative misc income. For example, if you have a $10,000 NOL, enter minus (-)10000 at the misc income box.
For tax purposes, you do not enter the loss amount shown on your 2018 Schedule C. A net operating loss is usually the negative number shown on line 7 of your 2018 form 1040.
Also note that your social security is not automatically untaxed. Social security becomes taxable when added to sufficient other income. If you are otherwise required to file a tax return, you do need to enter your SS in taxcaster. Taxcaster will determine the taxable portion.
