QB Issue Resolution:

Are you on Cash Accounting like most small businesses? If so it is January expense no matter how you look at it and splitting the check is pointless

If you are Accrual accounting then the expense for December  (if you entered the bill prior to 12/31) was already properly recorded in December and you still do not have to split the check.

If you did not enter 2 bills but wrote check go back and enter 2 bills, use pay bills and assign the check.

Resolution for Issue 'How to split the total payment amount into 2 different checks to expense each to the correct month without reconciling again?' available: Yes (Solved).
Source: Intuit Community forum.

How to split the total payment amount into 2 different checks to expense each to the correct month without reconciling again?: 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 accrual accounting
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Error Recovery for accrual accounting [Canada]
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