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Fix Invoice Tax Calculation and Display#90

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fix-invoice-tax-calculation-11342746705220958570
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Fix Invoice Tax Calculation and Display#90
MRiabov wants to merge 1 commit into
mainfrom
fix-invoice-tax-calculation-11342746705220958570

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@MRiabov MRiabov commented Feb 19, 2026

This PR fixes a bug where tax settings (default tax rate and inclusive/exclusive mode) were ignored during invoice generation. It implements tax calculation logic within InvoiceService, persists the calculated values to the Job record, and updates the PDF template to display the breakdown. Additionally, it resolves MissingGreenlet errors in InvoiceService by enforcing eager loading of necessary relationships.


PR created automatically by Jules for task 11342746705220958570 started by @MRiabov

- Modified `InvoiceService.create_invoice` to calculate subtotal, tax amount, and total value based on business tax settings.
- Added explicit eager loading of `job.business` and `job.line_items` in `create_invoice` to prevent `MissingGreenlet` errors and ensure correct async access.
- Updated `InvoiceService` to persist these calculated tax values to the `Job` record snapshot.
- Updated `PDFGenerator` to include `subtotal`, `tax_amount`, and `tax_rate` in the template context.
- Updated `src/templates/invoice.html` to display the tax breakdown (Subtotal, Tax, Total).
- Fixed regression tests in `tests/test_invoice_logic.py`, `tests/test_invoice_generation.py`, and `tests/test_payment_link.py` to align with the new logic and mocking requirements.

Co-authored-by: MRiabov <108194191+MRiabov@users.noreply.github.com>
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