estimate_employer_cost

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What a hire actually costs the employer: the gross wage plus the employer's own social security contributions at the rate OECD Taxing Wages publishes (single earner, no children, 100% of the average wage), applied as a flat rate — the figure employer-of-record services quote for a fee. Pass `gross` (annual USD) for your own figure; without it the wage is the pay-range midpoint for the `occupation` and `seniority`, and `basis` says whether that wage is measured (ILOSTAT) or modelled. Employee-side rates and OECD's tax wedge are returned for context and never applied. Without `country`, ranks the spine by employer contribution rate. Coverage is the 25 spine countries OECD measures; the other sixteen return NO_DATA, never a 0% rate (New Zealand's 0% is real: it has no employer contributions). Every response carries caveats — contribution ceilings, excluded schemes — and it is not payroll or legal advice.