Japanese SMEs running Odoo hit a wall the moment they try to run a real payroll cycle. Odoo Community ships no payroll engine at all, and even Enterprise hr_payroll has no Japan localization: no 健康保険 / 厚生年金 (health insurance / employee pension) tables keyed to the monthly standard remuneration grade (標準報酬月額), no 源泉徴収 income-withholding logic tied to the 甲/乙 tax tables and number of dependents, and no 住民税 (resident tax) special-collection handling where each employee's municipality sends a different monthly amount. Teams end up maintaining a parallel Excel workbook, re-keying figures into Odoo journal entries, and reconciling by hand every month — which is exactly where errors and late 納付 payments come from.

ECOSIRE builds a dedicated Japan payroll and employee-profile module on top of Odoo's HR framework. On the data side we extend hr.employee with the Japan-specific profile fields your payroll actually depends on — myNumber (individual number) stored with restricted access, health-insurance and pension enrollment numbers, standard remuneration grade, dependent count for tax and for insurance, resident-tax municipality, and bank details in the format your zengin (全銀) transfer file needs. Salary structures are modeled as Odoo hr.salary.rule records grouped into a Japan hr.payroll.structure, so gross-to-net is computed by real, auditable rules rather than a spreadsheet. Social-insurance premiums are computed from configurable rate tables (models.Model records you can update each fiscal year without a code change) against the standard remuneration grade, with the employer/employee split, and with 40-and-over long-term care insurance (介護保険) switched on by a compute field driven by date of birth via @api.depends.

Technically it is a clean Odoo addon: an __manifest__.py declaring dependencies on hr (and hr_payroll on Enterprise, or a Community-safe payroll base we include when you are not on Enterprise), models under models/ with fields and computed methods, XML/OWL form and list views for the payroll run and payslip, and QWeb PDF reports for the Japanese payslip (給与明細) and the monthly social-insurance and withholding summaries your accountant needs. Access is locked down with ir.model.access.csv plus record rules so that myNumber and salary data are visible only to authorized HR/payroll roles. Automated actions can generate the monthly payroll run and flag employees whose grade needs the annual 定時決定 (regular determination) review. Everything is reachable over Odoo's XML-RPC / JSON-RPC API, so an existing accounting or attendance system can push hours and pull net-pay figures.

Because this is build-to-order, nothing is a black box you download and hope fits. You request a quotation, we run a short scoping call to confirm your rate tables, pay calendar, allowances and which Odoo version (17.0, 18.0 or 19.0) and edition you run, then we build the module to that scope, test it on a staging copy of your database with your own employees, and hand over installable source plus a git repository. Typical delivery is one working week from confirmed scope, and every engagement includes UAT sign-off, training, and a post-go-live support window so your first live payroll run is one we run beside you.