Last updated:
A periodic inventory system updates inventory and cost of goods sold at intervals, usually after a physical count. A perpetual inventory system updates item quantities and cost records as purchases, sales, returns, transfers, and adjustments happen. Both need physical verification. The difference is when the records are updated and how much operational detail is available between counts.
How a periodic inventory system works
Purchases are accumulated during the period. At the end, the business counts closing inventory and calculates cost of goods sold from opening inventory plus purchases and related adjustments, less closing inventory under its accounting policy.
The approach can be simpler for a small operation with limited items and low transaction volume. Management has less timely visibility, and differences are often discovered only at period end.
How a perpetual inventory system works
Each valid movement updates the item record. The business can see a current recorded quantity, movements, and a running cost layer or average depending on the selected method. POS, purchasing, warehouse, and accounting workflows need consistent item and unit data.
Timely records help replenishment and exception review, but bad inputs update quickly too. Missed scans, incorrect units, duplicate receipts, and unrecorded damage still create differences.
Compare the two approaches
Visibility
Periodic inventory gives a dependable point-in-time result after a controlled count. Perpetual inventory can support day-to-day availability and purchasing decisions, subject to transaction accuracy.
Cost and complexity
A periodic process may need less technology but creates concentrated counting and closing work. Perpetual inventory requires item setup, transaction discipline, devices or interfaces, permissions, and ongoing reconciliation.
Finding loss and error
Periodic systems may reveal the total difference without showing exactly when it arose. Perpetual movement history can narrow the investigation, especially when counts are frequent and user actions are recorded.
Accounting
Both approaches must support the selected inventory valuation policy and financial reporting. Review cost layers, landed cost, returns, write-downs, and cut-off with your accountant rather than assuming system quantity equals accounting value.
Which system fits?
A small business with few items, modest movement, and simple purchasing may operate periodic inventory with strong count controls. A retailer or distributor with many daily transactions, several locations, stock reservations, or replenishment decisions may benefit from perpetual records.
The choice can be hybrid. A company may use perpetual records for operating control while relying on regular physical counts and formal period-end reconciliation. This is often the practical design: transactions create visibility, counts verify reality.
Questions to ask before changing
- Are item codes and units clean enough for transaction-level tracking?
- Can receiving, sales, transfers, returns, and damage be recorded at the right time?
- Who can adjust stock, and who reviews material differences?
- How will offline transactions or device failures be handled?
- Can the inventory control total reconcile to accounting?
- What historical data needs migration and verification?
Read the stocktaking guide for the physical control layer. The Codeblix inventory module is the relevant product page, while the inventory turnover calculator helps analyse how efficiently stock is moving.
Why this matters for Mauritius businesses
Mauritius is rolling out MRA e-invoicing in phases by taxpayer category. The timetable and status can change, and MRA may separately notify a taxpayer, so businesses should check the current MRA e-invoicing page and their own notices before acting on a deadline.
The Codeblix approach
Codeblix eInvoicing is MRA-listed as an EBS Solution Provider (SN 95, BRN C24214425). The system handles every aspect of MRA compliance automatically - real-time fiscalisation, IRN tracking, QR code generation, hash chain maintenance, and monthly transaction reporting. The local support team in Chamouny is available to help with any MRA query, audit, or transition question.
What to do next
If your present process does not support the fiscal-invoice requirements that apply to your business, document the gap and test an appropriate EBS workflow. Codeblix can review your business requirements and onboarding scope before preparing a proposal; regulatory conclusions remain with the taxpayer and its advisers.
Frequently asked questions
The most common questions about periodic vs perpetual inventory systems: which fits your business? are covered in the FAQ section below. If you have a question that is not covered, the local Codeblix support team is available by phone, WhatsApp, or email.
Related resources
Codeblix publishes a regular blog covering MRA e-invoicing, VAT compliance, payroll, and business management for Mauritius businesses. The blog is updated weekly with new guides, how-tos, and case studies. You can also find detailed product documentation, video tutorials, and a knowledge base in the Help Centre.
Frequently asked questions
What is the main difference between periodic and perpetual inventory?
Periodic systems update stock and cost of goods sold at intervals using physical counts. Perpetual systems update item records as transactions occur, while still requiring physical verification.
Does a perpetual system remove the need for stocktaking?
No. Counts are still needed to find damage, theft, scanning mistakes, unit errors, and transactions that were not recorded correctly.