ISAT Exam Dates and Test Windows 2026: When Should You Sit?
The ISAT is offered four times per year during designated test windows. Choosing the right window can make a significant difference to your application strategy. This decision should be based on your target university's application deadlines, how much preparation time you need, and whether you want the option to resit.
2026 Test Windows
- Window 1: 19 - 30 January 2026
- Window 2: 27 April - 8 May 2026
- Window 3: 27 July - 7 August 2026
- Window 4: 26 October - 6 November 2026
Each window spans approximately two weeks. Within that period, you schedule a specific date and time through ProctorU. Popular time slots fill up quickly, so register as early as possible once you have decided on a window.
Which Window Should You Choose?
The best test window depends on when your target university's application deadline falls and how much preparation time you need:
Applying for mid-year intake
If your target university accepts mid-year applications, sit in Window 1 (January) or Window 2 (April/May) to ensure your scores are available in time. Results are typically released a few weeks after each window closes, so factor in this processing time when planning.
Applying for the following year
Window 2 (April/May) or Window 3 (July/August) gives you a good balance between preparation time and having results available before most application deadlines, which typically fall between August and November. This is the most common strategy for students planning ahead.
First-year university students
If you are currently in your final year of high school and applying for the next academic year, Window 3 or Window 4 allows you to balance your school studies with ISAT preparation. However, be aware that some universities have application deadlines that may fall before Window 4 results are released.
Retaking the exam
You can only resit the ISAT after 12 months from your previous attempt. If you sat the test in January 2025, the earliest you can sit again is January 2026. Plan your initial test date with this constraint in mind, especially if you want the option of a second attempt before your application deadline.
Score Validity
ISAT scores are valid for two years from the date of the test. This means a score from January 2026 can be used for applications in both 2026 and 2027. This two-year validity gives you significant flexibility:
- If you are happy with your score, you can focus on other parts of your application without needing to resit.
- If you are not satisfied, you have time to prepare and resit the exam (after the 12-month waiting period) while your original score is still valid as a backup.
- If your plans change and you decide to defer your university application by a year, your ISAT score may still be valid.
Taking the test early maximises your options. The earlier you sit the ISAT, the more time you have to adjust your strategy based on your result.
Registration Deadlines
Registration typically opens several weeks before each test window and closes before the window begins. Do not wait until the last minute. Popular time slots on ProctorU can fill up, and late registration may mean you cannot get your preferred date and time.
Set a reminder to check the ACER ISAT website for registration opening dates. The registration fee is AUD $435, and payment is required at the time of registration. Keep your confirmation email as proof of registration.
Aligning Your Test Date with University Deadlines
Before choosing a test window, research the application deadlines for every university you are considering. Make a list of the earliest deadline and work backwards:
- Identify your earliest university application deadline.
- Subtract 4 to 6 weeks for score processing and release.
- Choose a test window that falls before this date.
- Allow at least 8 to 12 weeks of preparation time before your chosen window.
This backwards planning approach ensures you have enough time to prepare, sit the test, and receive your results before you need to submit your university applications.
