PL-400 Exam Dates 2026: Testing Windows, Deadlines & Scheduling

The PL-400 2026 Timeline at a Glance

If you're planning to earn the Microsoft Certified: Power Platform Developer Associate credential in 2026, the calendar matters as much as the study plan. This is a transition year: Microsoft is retiring the current PL-400 exam code in favor of AB-400, and the current six-domain blueprint itself is being refreshed effective March 19, 2026. Anyone scheduling a testing appointment this year needs to understand three dates simultaneously - the blueprint change date, the registration cutoff, and the final delivery date.

This guide walks through exactly what those dates mean for your scheduling decisions, how the exam is delivered, and how to sequence your preparation so you're not cramming the highest-weighted domain in the final week. For a deeper dive into what's actually tested, pair this with the PL-400 Exam Domains 2026: Complete Guide to All 6 Content Areas.

October 16, 2026 Registration Deadline

Mark this date clearly: PL-400 registration closes October 16, 2026. If you have not booked an appointment through Pearson VUE by that date, you will not be able to register for the PL-400 exam. This isn't a soft cutoff - it's the hard boundary Microsoft has set for new bookings under the current exam code.

Interestingly, October 16, 2026 is also the day AB-400 becomes available for the same underlying credential. In other words, the registration window for PL-400 and the launch date for its replacement land on the exact same day. This overlap gives candidates a decision point: register for the exam you've already been studying under the current blueprint, or pivot to the new AB-400 exam with its own four-domain outline.

October 30, 2026: The Last Day to Sit PL-400

Registering early doesn't mean you have to test immediately. Candidates who register by the October 16, 2026 deadline have until October 30, 2026 to actually sit the exam. That gives roughly a two-week buffer between locking in your seat and the final possible testing appointment.

Practically, this means the smartest move is to register as soon as your study plan is on track - not to wait until the deadline itself - because Pearson VUE appointment slots near a hard cutoff tend to fill quickly as other candidates make the same last-minute decision. If you're unsure whether your current knowledge is exam-ready, the PL-400 Study Guide 2026: How to Pass on Your First Attempt lays out a structured path to get there before you lock in a date.

Why AB-400 Changes the Scheduling Math

A lot of confusion around 2026 scheduling stems from the AB-400 transition, so it's worth being precise. AB-400 becomes available on October 16, 2026 and leads to the same Power Platform Developer Associate credential - but it does so through a forthcoming four-domain outline that is separate from the current PL-400 domains listed below. It is not simply a renamed version of the same test.

For scheduling purposes, this creates a fork:

• If you're already deep into PL-400 prep (studying the six current domains, practicing the current question formats), your priority should be registering and testing before the October 30, 2026 final delivery date.
• If you're just starting out and won't be exam-ready before October 2026, you'll likely end up preparing for AB-400's four-domain structure instead, once details are published.

Either path leads to the same credential, but the content, question mapping, and study materials differ. Don't mix resources built for one exam code with a booking made under the other.

Pearson VUE Testing Center vs. OnVUE

Regardless of which side of the October 16 line you fall on, delivery mechanics for PL-400 stay consistent through the current cycle. The exam is a proctored, 100-minute assessment that may include interactive components - not just static multiple choice - and it's delivered exclusively through Pearson VUE, either at a physical testing center or remotely via OnVUE online proctoring.

Scheduling considerations differ slightly between the two:

Whichever option you choose, the exam allows restricted Microsoft Learn reference access with the timer still running - a detail candidates frequently misunderstand. If you take a break during the exam, previously viewed questions lock, so pacing matters more than it does on open-book style assessments. The How Hard Is the PL-400 Exam? Complete Difficulty Guide 2026 breaks down how this timing pressure affects real candidates.

Scheduling Around the Six-Domain Blueprint

The current PL-400 blueprint - effective through the registration window described above, with a refreshed version effective March 19, 2026 - covers six domains:

Because Extend the platform carries roughly a third of the exam's weight, your scheduling decision should factor in how much runway you have to master plug-ins, custom APIs, and Dataverse SDK work specifically - this is not a domain you can review lightly in the final week. For a full breakdown of question expectations per domain, see the PL-400 Exam Domains 2026: Complete Guide to All 6 Content Areas, and confirm what score you actually need with the PL-400 Passing Score 2026: Exactly What You Need to Pass guide - remember, it's a scaled score of at least 700 out of 1000, not a raw percentage.

Retake Scheduling Rules You Need to Plan Around

If your target date is close to October 30, 2026, retake timing becomes a real scheduling constraint, not just a hypothetical. Microsoft's retake policy requires:

• A minimum 24-hour wait after a first failed attempt before rescheduling.
• A minimum 14-day wait between each subsequent attempt after that.
• A maximum of five attempts within any 12-month period, counted from your first attempt.

Do the math backward from your deadline: if you're aiming to finish before PL-400 retires, a failed attempt in mid-October leaves almost no room for a 14-day-spaced retake before October 30, 2026. This is exactly why candidates cutting it close should book their first attempt as early in the registration window as possible - not in the final days. All retakes remain subject to final PL-400 delivery availability, so don't assume a retry slot will simply be there.

Building a Backward-Planned Study Calendar

Rather than a generic weekly template, build your calendar backward from your chosen testing date, weighting time by domain percentage. Here's a sample structure for a candidate targeting an early-to-mid October 2026 exam date:

This sequencing front-loads the highest-weighted domain while it's still early enough to revisit if concepts don't stick. Combine it with practice questions on PL-400 Exam Prep to gauge readiness before locking in a Pearson VUE slot. If you want a condensed reference to keep nearby during final review, the PL-400 Cheat Sheet 2026: One-Page Review of Must-Know Facts is built for exactly that final week.

Before you finalize a date, it's worth confirming you actually meet the recommended background for the role - practical Power Platform development, security, ALM, C#, JavaScript/TypeScript, REST APIs, and Azure exposure. The PL-400 Requirements 2026: Eligibility, Prerequisites & How to Qualify page walks through what "recommended" really means in practice, and if you're still weighing whether this certification fits your career plans, the Is the PL-400 Certification Worth It? Complete ROI Analysis 2026 analysis and PL-400 Jobs overview are useful companion reads before you commit to a testing fee and appointment.

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