Tax
In-game
Using a sub-fief console for the first plot of land and afterwards using 'staking rods' to expand your base, each contribute to increasing your spice tax.
Arrakis is a fief, and then players have this thing they can craft called a sub-fief console, which allows them to claim a small piece of Arrakis. And then they have to pay tax to the Emperor for having that small piece.
You place [the sub-fief console and] it basically gives you an area that you can build within [...] And then you can extend the area you can build within using, they're called 'staking rods' at the moment.
You can build outwards to get a fairly large space," he says, "but you have to pay for it. And then it has maintenance costs. (Joel Bylos)[1]
Using the Lansrad to influence the spice tax
If you influence the Lansrad in particular ways they might reduce spice tax, which makes it very beneficial for you as a faction to have been stockpiling spice instead of selling it. Then wait until you win the Lansraad, change the spice taxation, and then sell a bunch because that's a great way to make money. (Joel Bylos) [2]
Gallery
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Inside Base