QB Issue Resolution:

The tax quarterly deadlines are in accordance with the IRS guidelines on Estimated Tax for individuals. Originally, the due dates for paying estimated taxes were on a calendar quarter. However, adjustments were made to cater the December (Q4) payment which was extended to January 15 to allow for end-of-year totals to be calculated. Then, the March payment was extended to April 15 (Q1) to coincide with Income Tax Return Filing.

The schedule works out like this:

  • For income received Jan. 1 through March 31, the estimated tax is due April 15.
  • For income received April 1 through May 31, the estimated tax is due June 15.
  • For income received June 1 through Aug. 31, estimated tax is due Sept. 15.
  • And for income received Sept. 1 through Dec. 31, estimated tax is due Jan. 15.

For more detailed information, you may check this IRS publication: Form 1040-ES.

Lastly, I’d suggest consulting with an Accountant or a Tax Professional to guide you with tax-related questions.

Also, you can check these articles for additional insights:

Resolution for Issue 'Why is Q2 two months long (April & May) and Q4 4 months long in here (Sept-Dec)?' available: Yes (Solved).
Source: Intuit Community forum.

Why is Q2 two months long (April & May) and Q4 4 months long in here (Sept-Dec)?: 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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