Hi,

To resolve the issue of incorrect final prices with tax in Odoo, you can use the cash rounding feature. First, enable 'Cash Rounding' in the Accounting settings under the Customer Invoices section. Then, navigate to Accounting --> Configuration --> Cash Roundings and create a new rounding rule. Configure the rounding precision and choose a rounding strategy, either "Modify tax amount" to adjust the tax or "Add a rounding line" to add a separate line item for rounding adjustments. Set the rounding method to UP, DOWN, or HALF-UP, depending on your needs. Once the rounding rule is created, apply it to a draft invoice by selecting it in the Rounding Method field. This will ensure that the final price, including tax, is rounded accurately according to your specifications.

Hope it helps