Oooo, Dave's fixed taxes. It now shows you the real production of your planet for your current tax rate.
Although to be honest, I don't see much point in setting things to less than 20%. The knock you get from is only 0.5% per 1% of tax rate. So 20% tax means you get 90% resource production. This is only really an issue for steel because everything else is in abundance, but 1k steel less for a massive increase in Quatloos income? I'll take that and just buy in the steel instead.
It might make a difference around the mid-80s, where you're about to start making a deficit of food.
Also makes a difference for colony jumping: building an arc from a planet as soon as you can. Means you get those few anti-matter you need later, so takes a few turns more to jump the arc around.