Fixed invoice tax rate

[korridor]

What does this PR do?

• Fixes #XXXX (GitHub issue number)

Checklist (DO NOT REMOVE)

• I read the contributing guide
• I signed the Contributor License Agreement.
• I commented my code, particularly in hard-to-understand areas

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.36%. Comparing base (bf11bac) to head (67fca5c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1184   +/-   ##
=========================================
  Coverage     89.36%   89.36%           
  Complexity     2078     2078           
=========================================
  Files           282      282           
  Lines         10079    10079           
=========================================
  Hits           9007     9007           
  Misses         1072     1072           

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