About the AAT Principles of Costing (PCTN) Assessment

Principles of Costing is the management-accounting unit of the AAT Level 2 Certificate in Accounting. It is the first place most AAT students meet costing: cost classification, cost behaviour, inventory valuation, labour pay, overhead absorption, simple budgets, variances and spreadsheet formulas. This introduction sets out what the assessment looks like, how it is weighted, and how the chapters of this guide map to AAT's published learning outcomes.

The Unit at a Glance

The current AAT qualification specification (version 5.6, published September 2026) describes the unit as follows. AAT's assessment code for the unit is PCTN, which is the code you will see when booking and in AAT examiner reports.

Unit assessments are not graded individually. Your PCTN percentage is weighted by 20% and combined with your other Level 2 results to give the qualification grade: Pass 70–79%, Merit 80–89% and Distinction 90–100%. AAT's own worked example shows a student scoring 81% on Principles of Costing, which contributes 16.2 percentage points (81% × 20%) to the overall grade.

Learning Outcomes and Weightings

The test specification gives four learning outcomes with fixed weightings. Use these weightings to decide where your revision time goes: learning outcome 2 alone carries 40% of the marks.

What the Assessment Feels Like

AAT's qualification specification says its computer-based assessments can include multiple-choice questions, numeric gap-fill questions and tools that replicate workplace activities. For PCTN that means:

• Drag-and-drop or pick-list classification tasks, such as deciding whether a cost is direct or indirect, fixed or variable, or a product or period cost.
• Numeric entry tasks, such as valuing an issue of inventory using FIFO, calculating gross pay with an overtime premium, or working out an overhead absorption rate.
• Table completion tasks, such as a manufacturing account, an inventory record, a budget or a variance report.
• Spreadsheet-style tasks, where you enter a formula such as =SUM(B4:B7) into a cell of an on-screen grid.

AAT's review of the Level 2 examiner reports published in October 2023 covered seven PCTN tasks. It found that 70% of students reached the required competence level and that students used 79% of the available time on average. The weakest tasks were overhead absorption rates and cost behaviour, labour and inventory calculations, and budget calculations and exception reporting using formulas. The same review warns that the assessment uses a spreadsheet style of question rather than spreadsheet software itself, so practise with AAT's familiarisation material as well as with Excel or Google Sheets. The task structure may change over time, so treat this as a guide to difficulty rather than a fixed paper plan.

Booking and Cost

• Where you sit it: at your AAT approved training provider or an AAT approved assessment venue, or by remote invigilation, which AAT offers for all unit assessments apart from a short list of exceptions that does not include PCTN.
• Fees: AAT states that assessment fees range from £40 to £70 depending on the qualification, paid to the training provider or venue, which may add an admin fee. Remote invigilation carries a £41 fee plus any booking fee charged by your provider. You also need to be a registered AAT student.
• Practice material: registered students can use AAT's practice assessments and the Lifelong Learning Portal through MyAAT.

What PCTN Does Not Examine

Many costing textbooks cover topics that sit beyond this unit. The PCTN specification states that it gives students "the basic tools for studies in overhead apportionment, reapportionment and absorption in later units", and it links the unit to Level 3 Management Accounting Techniques. This guide therefore flags the following as background only, not PCTN-assessed content:

• apportioning and reapportioning overheads between cost centres;
• under- and over-absorption of overheads;
• the high-low method, marginal costing, contribution and breakeven analysis;
• splitting variances into price, usage, rate and efficiency sub-variances;
• spreadsheet functions other than SUM (for example IF or AVERAGE).

How to Use This Guide

1. Work through the chapters in order. Classification (Chapter 3) underpins almost every later calculation.
2. Do every quiz and rework any you miss without looking at the explanation.
3. Drill the calculation topics with the free AAT Principles of Costing practice questions, especially inventory, labour, absorption rates and variances.
4. Practise under time pressure. Ninety minutes is enough, but only if the routine calculations are automatic.