Implement Singapore tax-benefit system#5

Merged

PavelMakarchuk merged 15 commits intomainfrom

implement-sg-tax-benefit-system

Mar 4, 2026

Commits on Feb 25, 2026

Implement Singapore tax-benefit system with income tax, CPF, and social benefits

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Add stamp duty, GST, ComCare, U-Save, and enhanced Silver Support tiering

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Fix CPF rates and add missing tax reliefs

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Commits on Feb 26, 2026

Add GSTV MediSave, S&CC rebate, PTR, CPF family top-up, and gaps tracker

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Add 12 new benefit programs, fix WIS tapering and NSman relief

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Resolve all low-priority GAPS items (1.5-1.8)

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Add .gitignore, changelog fragment, and update changelog entry

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Update README to reflect implemented programs

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Add tests for 5 untested formula variables

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Remove all hardcoded values from variable formulas

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Fix parameter references, values, and effective dates

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Fix review findings: entity mismatch, references, tests, and cleanup

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Address review findings: code patterns, metadata, and boundary tests

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Commits on Mar 2, 2026

Add validation test suite cross-checked against official calculators

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Commits on Mar 3, 2026

Add non-resident director and S&CC rebate validation tests

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