Budgets, in depth
The way billable work actually has them.
Most trackers bolt budgets on. Timero started with them. The domain model carries every distinction that matters, and the math has its own unit-test suite.

Bank-of-hours or retainer
A bank drains down. A retainer refills on a schedule. Both, mixed in the same workspace, both honored by the over-budget engine.
Scope: all client work, or a single project
One budget can cover an entire client relationship, or scope to a single project under that client.
Expiry and payment references
Effective date and optional expiry. PO numbers or invoice IDs as payment references for reconciliation later.
Waterfall history
See exactly which budget each entry consumed, with refills, expiries, and any over-budget tail visible.
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