When I taught 1/4 time I brought home 1/2 of what I brought home when I was full time.
the most fair tax would be like a sales tax where every time a dollar changed hands a nickel would be sent to the government. No exemptions for anything. If someone pays you a buck to do your job 5 cents would go to the government. If you buy something a nickel would be sent to the gov. It would be simple but could be abused if not monitored carefully.