Principia School PrinBill Guide (PreK-12)

PrinBill is Principia’s online bill payment service. Monthly billing statements must be viewed online. Payments can be made electronically with secure online access from a U.S. checking or savings account or by credit card. No paper billing occurs with PrinBill, so you must be on the lookout every month for PrinBill email notifications.


Authorized User Email Login—Parent Access

For parents of students attending The Principia School, a personal secure Authorized User email login is provided to you by Billing Services. The parent’s email address on file will become the Authorized User Email login User ID. If there are other family members or friends who parents would like access to view bills or pay online, please send an email to If you have more than one child attending Principia your one Authorized User Email login and password will give you access to all accounts.

Monthly Billing Statements

Important: The “New PrinBill eStatement Available” email summary you receive each month is NOT the actual monthly statement. You must log in to your student’s PrinBill account to view the monthly billing statement which includes all account details. Billing statements are generated on the last business day of each month. Up to 18 months of monthly billing statements are available in the drop down menu.

Payment Methods

Available online payment methods include electronic bank payments (ACH debits), and credit cards. Credit card payments incur a convenience fee of 2.85% ($3.00 minimum per transaction). There are no fees for paying by electronic ACH and this is Principia’s preferred payment method.

Paper check payments should be mailed to the following address:

The Principia
Attn: Cashier
13201 Clayton Road
St. Louis, MO 63131-1002

Monthly Installment Payment Plan

School charges may be paid over a nine-month installment plan during the school year. The payment plan starts in August, with the first payment due by August 15. Each subsequent payment is due by the 15th of each month. The final payment is due by April 15. There is no fee for the installment plan. A $20 late charge will automatically apply to accounts for installments not received by the due date.

Important: If the authorized user wishes to receive all PrinBill email late notices and reminders he/she must enroll in the payment plan by August 10. After that date our office will automatically enroll the student and authorized users may not receive PrinBill late notices and reminders.

Charges added to a PrinBill account will be included in the payment plan. If charges are incurred throughout the school year they will be added to the plan and spread out over the remaining months of the payment plan. Note: New charges added to accounts during the school year will increase all remaining unpaid monthly installments resulting in larger monthly installments for the remainder of the payment plan.

International Payments

Options for international payments include wire transfer, credit card, or checks payable in U.S. dollars. Additionally, to allow international students to pay in their local currency, Principia has partnered with TransferMate to provide seamless international payments through your online PrinBill account. To pay using TransferMate log into your student account, select “Make A Payment”, then under “Payment Method“ choose TransferMate INTL from the dropdown menu, and follow prompts.


For more information about using TransferMate, please watch this video.

If you have questions about international payments please contact Billing Services,

Changing Email Addresses, Passwords or Banking Information

  • To change your email address or your password go to My Profile Setup and select Personal Profile.
  • To change your saved bank account information go to My Profile Setup and select My Payment Profile. (It is possible to save more than one payment method just by adding a new payment method.)

Billing Services Contact Information:

School / College Accounts

Milly Mensing