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…al benefits Add comprehensive implementation covering: - Personal income tax with 13 progressive brackets (0-24%) and 10+ relief types - CPF contributions with 5 age bands and 2024-2025 rate updates - Workfare Income Supplement (WIS) eligibility and benefit calculations - Silver Support Scheme eligibility and payment calculations - GST Voucher cash, CDC vouchers, and property tax calculations - Skills Development Levy (SDL) calculation - 59 variables and ~100 parameter files sourced from .gov.sg primary sources - 29 YAML tests covering all calculation chains Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…ring - Add buyer's stamp duty (BSD) with 6 progressive brackets - Add additional buyer's stamp duty (ABSD) with 7 buyer profile categories - Add GST calculation on taxable consumption - Add GST Voucher U-Save rebates with HDB flat-type tiering - Add ComCare Long-Term Assistance with household-size-based amounts - Enhance Silver Support with HDB flat-type and income-based tiering - Add immigration status and buyer profile enums - Add 21 new tests covering all new calculation chains and edge cases Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Fix CPF above-55-to-60 rates: employee 15.5%/17%, employer 15.5%/15.5% (2024/2025) - Fix CPF above-60-to-65 rates: employee 11.5%, employer 12% for 2025 - Add working mother's child relief (WMCR) with fixed amounts ($8k/$10k/$12k) - Add grandparent caregiver relief ($3,000) - Add handicapped sibling relief ($5,500 per sibling) - Wire all 3 new reliefs into total_personal_reliefs - Add income per capita ceiling check to Silver Support eligibility - Add disability age exemption to WIS eligibility - Add 7 new tests for reliefs, WIS disability, and Silver Support income ceiling Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add GST Voucher MediSave top-up with age bands and AV tiering (9 params + 6 tests) - Add GST Voucher S&CC rebate with HDB flat-type-based months (6 params + 5 tests) - Add parenthood tax rebate capped at tax after PIT rebate - Add CPF cash top-up relief for family members - Wire PTR into income tax calculation chain - Add GAPS.md tracking all known missing programs and needed adjustments Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Key components
gov/iras/(income tax, property tax, GST, stamp duty),gov/cpf/(contributions, WIS, Silver Support),gov/mof/(GSTV, CDC),gov/mom/(SDL)Primary sources
Test plan
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