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How can we round up the tax to 2 decimals, but the last decimal should be either 0 or 5. I have this rule for the round up:

if ($decimal % 10 <= 2) {
  // Here, the last decimal should be 0.
}
else if ($decimal%10 > 2 && $decimal%10 <=7) {
  // Here, the last decimal should be 5.
}
else {
  // Here, the decimal should be incremented by 1, while making the last decimal 0.
}

For examples:

  • 10.24, rounds up to 10.25
  • 10.67 rounds up to 10.65
  • 10.88 rounds up to 10.90
  • 10.99 rounds up to 11.00

Can I alter the tax adjustment somewhere? Also, I would like to calculate it on the full order price, not individually for all order items.

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  • Welcome to Drupal Answers! Are you asking how to achieve what described with code, or with a module?
    – avpaderno
    Commented Dec 17, 2021 at 19:19
  • With code if it is possible, even with a patch on commerce that I could attach Commented Dec 17, 2021 at 23:04

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