Finding it hard to run a fiscally responsible empire of the dead? A lot of players seem to struggle with the low income of the TKs, but there is a simple way to make enough to easily get all those juicy pyramids and T5 buildings, regardless of your tech level (you'll need some heroes unlocked, though).
What you need are seven (or six if you control the entire province and use the edict) characters with Charnel Valley Necrotects, a very common follower that heroes and lords pick up quickly enough if you use them. It reduces the cost of infrastructure improvements by 15% -- and it stacks additively. Yes, that means that six characters with this follower and the edict can build infrastructure improvements for free (10% + 6 x 15% = 100% reduction).
For efficiency a single lord with the the heroes embedded can use force march to loop around keeping the chain going. Any infrastructure building works, but the Nehekharan Citadel and the Royal Burial Chamber are recommended. Adjust your run as needed depending on whatever other bonuses you're running.