The Threshold Achievement Test can be administered any time beginning on or after June 15th of each year. Testing may continue throughout the year. All testing must be completed by the end of the day on May 31st of each year. Any test that has not be stopped by the test manager will automatically be stopped by the Threshold Achievement system on June 1st at midnight US Eastern Time. No testing can take place after June 1st.
Important Dates
| June 15 | The beginning of the TATIL testing session. Tests may be started beginning on this date. |
| December 24 | The beginning of the Winter maintenance period. Testing may continue. No tests can be started or stopped. |
| January 2 | End of the Winter maintenance period. Tests may be started and stopped. |
| May 31 | The end of the TATIL testing session. All testing must be completed by the end of the day. |
| June 1 | The beginning of the Summer maintenance period. All running tests are automatically stopped. |