Problem

Standard Odoo purchase requisitions lack tax calculation capabilities, causing:

• Inaccurate cost estimation – Cannot see total cost including taxes during planning phase
• Budget discrepancies – Requisition amounts differ from actual purchase order totals
• Manual calculations – Users must calculate taxes separately for accurate budgeting
• Poor decision making – Approvers lack complete financial picture when reviewing requisitions

Solution

This module extends purchase requisitions with comprehensive tax management:

• Line-level tax selection – Apply multiple taxes to each requisition line
• Automatic calculations – Real-time computation of subtotals, taxes, and totals
• Visual tax breakdown – Account-style tax totals widget for clear presentation
• Accurate forecasting – See exact costs before creating purchase orders
• Multi-currency support – Proper rounding and currency handling

Benefits

• Accurate budget planning and approval process
• Eliminates discrepancies between requisitions and purchase orders
• Faster approvals with complete cost visibility
• Better vendor comparison with tax-inclusive pricing

Technical Details

Models Extended

• purchase.requisition – Adds tax total fields and computation methods
• purchase.requisition.line – Adds tax field and amount calculations

Key Fields Added

Header Level:

• amount_untaxed – Subtotal before taxes
• amount_tax – Total tax amount
• amount_total – Grand total
• tax_totals_json – Tax breakdown for widget display

Line Level:

• taxes_id – Many2many relation to account.tax
• price_subtotal – Line amount before tax
• price_tax – Tax amount for line
• price_total – Line total with tax

Usage

1. Create/edit a purchase requisition
2. Select taxes on each line (supports multiple taxes)
3. View automatic calculation of totals
4. Review tax breakdown at form bottom