Introduction
For most Irish SME owners, a letter from Revenue is never a welcome sight. And the one that begins with “We have selected your tax affairs for review…” can stop your heart.
Revenue audits are stressful, time-consuming, and potentially expensive. But here’s the truth most business owners don’t realise: Revenue doesn’t select audit cases at random.
There are specific behaviours, numbers, and filing patterns that make Revenue sit up and take notice. The good news? Once you know what they are, you can avoid them.
In this guide, we’ll walk through the five most common Revenue audit triggers for Irish SMEs—and exactly how to keep your business off their radar.
Trigger #1: Consistently Low Profits Compared to Industry Norms
What happens:
Revenue has access to vast amounts of data. They know, for example, what a typical pub, building firm, or hairdressing salon in your area should earn relative to its expenses.
If your declared profits are significantly below the industry average—year after year—it raises a flag.
Why it triggers audits:
Revenue may suspect:
- Cash sales not being declared
- Personal expenses being claimed as business expenses
- Stock being understated or sales omitted
How to avoid it:
- Know your industry norms. If your margins are genuinely lower (e.g., you’re a new business building market share), be prepared to explain why.
- Document everything. If you had a bad year—a key client left, equipment broke, premises flooded—keep records. A genuine explanation is your best defence.
- Don’t “round down” cash. Declare all income, even small cash sales.
Trigger #2: Repeated Late Filings or Payments
What happens:
Revenue’s systems track your compliance history. If you consistently file VAT returns late, submit RTDs after the deadline, or pay preliminary tax late, your compliance score drops.
Why it triggers audits:
Late filing suggests one of two things:
- Poor financial control (which increases the risk of errors)
- Deliberate avoidance (keeping cash flow ahead of tax due)
How to avoid it:
- File on time, every time. Set calendar reminders well in advance.
- Use direct debit for VAT and RTD payments to avoid “forgetting.”
- If you’re struggling, contact Revenue before the deadline. They are often more lenient if you engage early.
Trigger #3: Discrepancies Between Returns
What happens:
Revenue cross-checks everything. They compare:
- Your VAT returns against your corporation tax returns
- Your RTD submissions (payroll) against your VAT turnover
- Your personal tax return against your business returns (for directors)
If your VAT return shows €100,000 in sales but your corporation tax return shows €80,000, Revenue will want to know why.
Why it triggers audits:
Discrepancies suggest:
- Errors in bookkeeping
- Incomplete records
- Possible under-declaration
How to avoid it:
- Reconcile regularly. Ensure your VAT, payroll, and annual returns all tell the same story.
- Use integrated software. Xero, QuickBooks, and Sage can help ensure numbers flow correctly between returns.
- Get a year-end review. An accountant can spot and correct discrepancies before you file.
Trigger #4: Claiming High Levels of Expenses (Especially Motor and Travel)
What happens:
Certain expense categories are historically abused—and Revenue knows it.
High claims for:
- Motor expenses (fuel, repairs, mileage)
- Travel and subsistence
- Entertainment
- Home office costs
…can all trigger a closer look.
Why it triggers audits:
Revenue questions:
- Is this genuinely business-related?
- Is there a personal element that should be apportioned?
- Are the records (logbooks, receipts) available to prove it?
How to avoid it:
- Keep a detailed mileage log for business travel (date, destination, purpose, distance). Revenue will ask for it.
- Don’t claim 100% of a mixed-use asset (car, phone, laptop) unless you can justify it.
- Retain all receipts. Revenue requires original documentation, not just bank statements.
Trigger #5: Related Party Transactions (Directors’ Loans, Family Payments)
What happens:
Transactions between you and your business—or between your business and family members—are closely scrutinised.
Common examples:
- Directors’ loans not repaid
- Salary paid to a spouse with no clear role
- Rent paid to a family member for business premises
- Below-market transactions between connected companies
Why it triggers audits:
Revenue looks for:
- Benefit-in-kind (if you use a company asset personally)
- Disguised remuneration (paying family members to reduce tax)
- Transfer pricing (moving profits to lower-tax entities)
How to avoid it:
- Document the commercial rationale. If you pay a spouse, ensure they actually do the work and are paid a market rate.
- Track directors’ loans carefully. If you take money from the company, record it. Repay it or declare it as benefit-in-kind.
- Ensure transactions are at arm’s length. Charge market rates for rent, interest, or services between connected parties.
Bonus Trigger: Anonymous Tips and Third-Party Information
What happens:
Revenue operates a confidential disclosure line. Competitors, disgruntled ex-employees, or even former partners can tip them off.
They also receive data from:
- Banks (suspicious transactions)
- Other government agencies
- Social media (yes, Revenue monitors public posts)
Why it triggers audits:
If someone alleges you’re taking cash, living beyond declared means, or understating income, Revenue is obliged to investigate.
How to avoid it:
- Run a clean business. If you declare all income and pay what’s due, a tip-off won’t find anything.
- Be mindful online. Posting about luxury holidays or new cars while declaring low income can attract attention.
- Treat ex-employees professionally. How you part ways matters.
What to Do If You’re Selected for Audit
Despite your best efforts, audits can still happen. If you receive that letter:
- Don’t panic. Many audits are routine or random.
- Engage a professional immediately. A tax consultant or accountant should represent you.
- Gather your records. Revenue will specify what they want—provide exactly that, nothing extra.
- Be honest. If errors are found, co-operation and early disclosure lead to much lower penalties.
How Intax.ie Can Help
At Intax.ie, we help Irish SMEs stay audit-ready all year round—not just when Revenue comes calling.
We offer:
- Compliance health checks to identify potential triggers before Revenue does
- Full bookkeeping and accountancy so your returns are accurate and consistent
- Revenue audit representation—we stand with you if Revenue queries your affairs
- Tax consultancy for complex issues or transactions
Contact our team today to discuss your compliance position and ensure your business isn’t accidentally waving red flags at Revenue.
Summary: The 5 Revenue Audit Triggers
| Trigger | Why It’s a Red Flag | How to Avoid It |
| Low profits vs industry | Suggests undeclared income | Know your norms, document bad years |
| Late filings/payments | Indicates poor control or avoidance | File on time, use direct debit |
| Discrepancies between returns | Errors or under-declaration | Reconcile regularly, use software |
| High expenses (motor/travel) | Personal use or lack of records | Keep logs, retain receipts |
| Related party transactions | Benefit-in-kind or disguised pay | Document commercial rationale, arm’s-length pricing |
