I.L. API: Document how IL tables are used to calculate limits for FE

[wesrowe]

Description

User story

AS AN Engineer I WANT to have a clear diagram of how data input to API is used to calculate limits for FE SO THAT I can implement a well-tested application.

Engineering notes / background

Analytics considerations

Quality / testing notes

See ACs around cross-verifying threshold calculations.

Acceptance criteria

• [x] Mural depicts:
  • [ ] Values coming from FE: year, zip, dependents
  • [ ] 5 tables on vets-api
  • [ ] Any math applied to table data to yield correct result
• [x] Manually cross-calculated Pension, NMT, and GMT thresholds for 2021 using the documented business logic and compared to screenshots of old wizard results for two cases:
  • [ ] Veteran with spouse and child (2 dependents) in zip 66207 (GMT > NMT)
  • [ ] Veteran with spouse and child in zip 72401 (GMT < NMT)
  • [ ] Documented lookup values and math in spreadsheet (on VA Sharepoint, access from CAG)
• [x] Manual cross-calculation values tracked in this ticket
• [ ] IL tables use is documented in a file in github product folder, under products > income limits > engineering (okay for light words here with link to mural etc)

[wesrowe]

Cross-check of calculations

GMT > NMT case - zip 66207, 2021, 2 dependents

Old wizard values (from screenshot)

Calculations:

GMT < NMT case - zip 72401, 2021, 2 dependents

Old wizard values (from screenshot)

Calculations:

[wesrowe]

Josh was able to use my work to implement. Donezo!