5 Invoicing Mistakes That Cost Solo Businesses in Mauritius Money

Invoicing seems straightforward — write down what you did, add a price, send it off. But the MRA has specific requirements for what a valid invoice must contain, and missing even one field can result in penalties or complications during an audit. Here are five mistakes we see regularly among solo service businesses in Mauritius.

1. Missing or Incorrect BRN

Every invoice must display the supplier's Business Registration Number and, if applicable, the VAT registration number. We frequently see invoices where the BRN is outdated, partially entered, or simply omitted. The MRA treats this as a compliance failure. Check your BRN against your Business Registration Act certificate and make sure it appears exactly as issued.

2. Gaps in Invoice Numbering

Under the VAT Act, invoices must be numbered sequentially with no gaps. This means you cannot delete an invoice and reuse its number, and you cannot start a new sequence without justification. If you are using Word or Excel, it is remarkably easy to accidentally create a gap — and an auditor will spot it immediately. Software that enforces gap-free numbering eliminates this risk entirely.

3. Omitting the Supply Type Code

Mauritius uses supply type codes — TC01 through TC06 — to classify the nature of each transaction. TC01 covers taxable supplies at 15% VAT, TC02 covers zero-rated exports, and so on. Choosing the wrong code can result in incorrect VAT calculations and potential penalties. Make sure your invoicing system supports all six codes and lets you select the correct one for each transaction.

4. No Customer BRN on B2B Invoices

When invoicing another business, you must include the customer's BRN on the invoice. This is a mandatory field under the MRA's standard e-invoice template. Forgetting it creates an incomplete record that could be questioned during an audit. If you do not have your customer's BRN on file, ask for it before issuing the invoice.

5. Not Archiving Invoices for Five Years

The MRA requires businesses to retain copies of all invoices for a minimum of five years. This applies to both paper and digital records. If your invoices live only in your email outbox or on a USB stick, you are not properly archiving. Use a system that stores your invoices centrally and makes them retrievable on demand.

The Fix Is Simpler Than You Think

Most of these mistakes disappear the moment you move from manual invoicing to software that enforces MRA compliance. The right tool will handle BRN display, sequential numbering, supply type codes, customer details, and archival — so you can focus on the work instead of worrying about whether your paperwork will survive an audit.