QB Issue Resolution:

estimated tax is a best guess as to how much you will owe if you did nothing

make a payment and now there is less you owe

Resolution for Issue 'Just made an estimated tax payment through mail. Why does the estimated tax number decrease based on this payment?' available: Yes (Solved).
Source: Intuit Community forum.

Just made an estimated tax payment through mail. Why does the estimated tax number decrease based on this payment?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for estimated tax
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Error Recovery for estimated tax [Canada]
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