Earnings statements are based on the invoice closing date (in other words, they are calculated every week). The Tax Summaries are based on the bill payment date (aka they are calculated by the calendar month). This means that when you are attempting to calculate Fees or Fares for the taxable year, this difference in calculation needs to be accounted for.
For example: A Bill Payment Date could end on 11/01. But an Invoice Payment Date would end on 10/31.
If you add up all Monthly Summaries, you should end up with the Annual Tax Summary amount. Additionally, if you add the listed fees together from the Monthly Tax Summaries, you should end up with the same amount listed on the Annual Tax Summary.
If you find any discrepancies in this information, please let us know!