If you can go to the Tools menu, somewhere there is an option for "send file to agent." This creates an anonymous version of the file and uploads it to tech support, and gives you a token number. If you post the token number here, we can forward this for investigation.
The tax on line 15 is probably calculated on an internal worksheet that may be visible if using the desktop program but won't be visible online. Either someone with a desktop program can test a similar scenario, or we can report this issue and your token number to the moderators and ask them to forward it to tech support.
You could also call customer service and try to get an expert to look at the token number with you on the phone, but tech support for the FreeFile version is extremely limited and it may be hard to convince them to talk to you.
