SD App — Roadmap

Summary: Port LevPro leveraged investing analysis to a modern SvelteKit PWA — starting with a static demo-teaser and expanding to a full interactive calculator with historical data and multi-country support. Description: The SD App is a phased port of the VB6 LevPro software. Phase 1 ships a static “SD Snapshot” to build the audience; subsequent phases add historical analysis, live calculations, and US market support. Type: Complex

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Phase 1 — SD Snapshot (Interest-Only Demo-Teaser)

• Task-1: sd-math Python library + VB6 port (interest-only + term loan)
• Task-2: Golden fixtures (LevPro validation to 0.01% tolerance)
• Task-3: SvelteKit renderers (int-only + term-loan, CA/EN + CA/FR)
• Task-4: Snapshot normalization ($500/month gross basis)
• Task-5: Output simplification + “See All” progressive disclosure
• Task-6: Optional — live API form inputs (interest rate / monthly amount)

Phase 2 — Historical Analysis (Canada)

• Task-1: Historical market data pipeline (yfinance or equivalent)
• Task-2: “If I had used $MART DEBT” renderer
• Task-3: Historical snapshot JSON generator

Phase 3 — Full SD App (Live Calculator)

• Task-1: FastAPI Python backend (sd-api)
• Task-2: Live user inputs (replace static snapshot with API calls)
• Task-3: QC / French-Canadian tax treatment
• Task-4: RRSP Gross-Up strategy (already done when prototyping SvelteKit PWA)

Phase 4 — US Extension

• Task-1: US tax model (capital gains, dividend treatment)
• Task-2: US calculator routes + i18n
• Task-3: US golden fixtures

Phase 5+ — Expansion (Demand-Driven)

• explore Big Impact upgrades
  • Before-Tax Thinking/Trap vs After-Tax Truth (One-click contrast)
• PDFs, and other Advisor components
• Add monthly cash flows
• Embeddable Snapshot component for sdc.com
• Add French

Future Upgrades

• See UPGRADES for possible upgrade ideas