I work in Illinois and live in Wisconsin. My employer is not registered in WI so state tax was not withheld. I started preparing my taxes online and I thought that once my earnings and deductions were entered that it would automatically calculate how much I would owe the state of Wisconsin. It did not. So how do I calculate how much I owe and how do I file?

“I work in Illinois and live in Wisconsin. My employer is not registered in WI so state tax was not withheld. “==>As there is a reciprocal Agreement between WI and IL, If you work in IL and are a resident of WI, you do not have to pay IL income taxes on your wages. You would submit exemption Form IL-W-5-NR to your ER. You, as a full year resident of WI, need to pay tax only to WI,NOT to IL.
“I started preparing my taxes online and I thought that once my earnings and deductions were entered that it would automatically calculate how much I would owe the state of Wisconsin. It did not. So how do I calculate how much I owe and how do I file?”==> I am familiar with your state return software; Perhaps you need to contact the software vendor or the software developer etc,OK???