WattShed Stack
Every funding source, one project, no double dipping.
Every rule here is one you enter. WattShed ships no incentive database of its own, so nothing is prefilled: add the funding sources a project could draw on, the pairs that can't be combined, and an optional project cap, then check one project's eligible cost against exactly those rules.
This is arithmetic over the administrator's own program rules, not a source of those rules. Informational only, not program guidance or tax advice. Everything computes in this browser; nothing you enter is stored.
Define the funding sources
A row for every program on the table
Nothing is prefilled. Add each funding source a project could draw on: its kind, and whether it pays a flat dollar amount or a percent of eligible cost, with an optional dollar cap.
No funding sources yet. Add one below, or load the example to see the tool with data already in it.
Exclusion rules
Sources that can't combine
Pick two sources whose own terms say they can't be stacked on the same project. Add as many pairs as apply.
Define at least two complete funding sources above to set an exclusion between them.
No exclusions added yet. Every pair of sources is treated as combinable until you add one.
Project cap
Total incentive ceiling (optional)
The most every funding source combined can pay toward one project. Leave blank if no such ceiling applies.
Check a project
Eligible project cost
The project's total eligible cost, before any incentive is applied.
Result
Define at least one complete funding source on the left to see a result.
Arithmetic over the funding sources, exclusions, and cap you set above. Not a real determination and not tied to any actual program.
Related tools
Why stacking breaks
Three ways a clean set of programs turns into a stacking problem.
Exclusion rules between programs
Two sources look fine on their own, but one program's terms say it can't be combined with another. Miss that pairing and a project gets approved for money it was never allowed to stack.
Caps that bind in the wrong order
A percent-of-cost cap, a dollar cap, and a project cap can all apply to the same project. Which one binds first changes what actually gets paid, and doing that math by hand is where mistakes hide.
Totals that quietly exceed project cost
Add enough sources and the combined total can climb past what the project actually costs. Nobody meant for that to happen; it's just what falls out of stacking rules nobody checked together.
A clean report here does not confirm a project is eligible for any listed source. It confirms the sources, exclusions, and cap you entered add up the way you said they should.