How cash is earned
Officially confirmed: cash comes from combat — kills and wave progress — and funds every loadout and car upgrade.
Build and Kill Zombies Cash System Reference
How the cash economy works, what official sources confirm, and how to plan spending without made-up numbers.
What rates are public
None. The game publishes no cash-per-kill rates or price tables — any exact figure anywhere is a player estimate.
How to plan anyway
Use your own run numbers in the cash calculator: it shows the math behind your estimates and the purchase priority they imply.
Spending rules of thumb
Where cash usually goes first
- Early: cheap rapid damage — it pays for itself fastest in the first ten waves.
- Mid: one survivability piece, then back to damage — income needs a living car.
- Late: heavy single-target damage for record pushes, plus a second defensive layer.
Related pages
Check these before spending
Use this reference with the cash planner: target the highest-cost upgrade you can afford per run, then recalculate after every payout.