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Calibrate SPI income bands to their projected values, and map the 2023-24 outturn to 2023 #557

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Calibrate SPI income bands to their projected values, and map the 2023-24 outturn to 2023 #557

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ca87af4
Map the 2023-24 SPI and CGT outturns to PolicyEngine year 2023
MaxGhenis Oct 10, 2026
a608ddb
Calibrate SPI income bands to their projected values
MaxGhenis Oct 10, 2026
47fa84e
Serve the SPI merge test the committed table, and fix the sampling date
MaxGhenis Oct 11, 2026
fa4ebe9
Merge origin/main and regenerate SPI projections from the 2023 outturn
MaxGhenis Oct 16, 2026
c9229ee
Refresh SPI changelog after integrating current uprating factors
MaxGhenis Oct 16, 2026
4840083
Defer CGT target year changes to the follow-up after #571
MaxGhenis Oct 16, 2026
473adaf
Describe the SPI-only calibration fix and defer CGT follow-up
MaxGhenis Oct 16, 2026
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1 change: 1 addition & 0 deletions changelog.d/spi-tax-year-start.fixed.md
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Map the HMRC Survey of Personal Incomes 2023-24 outturn to PolicyEngine year 2023, the tax year it describes, instead of 2024. Return each SPI income band as one target that holds both the base year and the projected years, so calibration uses the projected values rather than the base-year outturn carried forward. Regenerate the SPI projections from the corrected base year with the current uprating factors. Defer the CGT year mapping and aggregate/band feasibility to a follow-up on top of #571.
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