Add cash ISA and stocks and shares ISA holdings variables#1791
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vahid-ahmadi wants to merge 2 commits into
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Add cash ISA and stocks and shares ISA holdings variables#1791vahid-ahmadi wants to merge 2 commits into
vahid-ahmadi wants to merge 2 commits into
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Add two household-level wealth input variables, cash_isa and stocks_and_shares_isa, so the model can carry ISA balances separately. Previously the only ISA variable was the interest-income flow (individual_savings_account_interest_income); ISA *balances* had nowhere to land — investment ISAs were folded into corporate_wealth in the (now archived) policyengine-uk-data wealth imputation, and cash ISAs were not represented at all. These variables provide the model-side home for ISA balances imputed by the data pipeline (populace). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Adds two household-level wealth input variables:
cash_isa— amount held in cash ISAsstocks_and_shares_isa— amount held in stocks & shares (investment) ISAsBoth are
Household,STOCK,GBP, GDP-per-capita uprated, mirroringcorporate_wealth/savings.Why
The only ISA variable today is the income flow
individual_savings_account_interest_income. ISA balances had nowhere to land:corporate_wealthin the (now archived)policyengine-uk-datawealth imputation, so they were not separable; andThese variables provide the model-side home for ISA balances imputed by the data pipeline, enabling ISA-balance modelling (ISA reforms, wealth-tax scenarios).
Data side
The matching data work — surfacing
cash_isaandstocks_and_shares_isafrom the Wealth and Assets Survey in the populace UK build — is tracked in PolicyEngine/populace#180.