For many small businesses, GST/HST filings are just another task on a long to-do list. But when records are messy or numbers do not line up, the CRA may ask questions, request support, or start a review. The good news is that most GST issues are avoidable with steady bookkeeping and a few simple habits.

1. Claiming input tax credits without proper support
One of the most common mistakes is claiming GST/HST input tax credits without keeping proper receipts or invoices. The CRA expects records that show the supplier, the date, the amount, and the tax paid. If those records are missing, the claim may be denied.

2. Mixing personal and business expenses
Small business owners often use the same card or account for both personal and business purchases. That can make GST reporting harder to track, especially for meals, vehicle costs, home office expenses, and shared subscriptions. When expenses are blended, it becomes harder to prove which portion was eligible for GST claims.

3. Using estimates instead of actual records
It is tempting to round numbers or estimate amounts when books are behind. But repeated estimates can make a return look unreliable and may lead to questions. The CRA generally expects filings to be based on source documents, not rough guesses.

4. Filing late or missing deadlines
Late GST/HST returns do not automatically mean a review, but they can create red flags. A pattern of late filing may suggest weak recordkeeping or cash flow issues, which can lead the CRA to take a closer look. Filing on time also makes it easier to spot and fix problems before they grow.

5. Seeing sudden changes in sales or ITCs
A big jump in sales, input tax credits, or tax remitted can stand out on a return. The CRA compares current filings with prior periods, so unusual changes may prompt follow-up questions. Sometimes the change is legitimate, but it helps to have an explanation ready.

6. Charging GST incorrectly
Some businesses charge GST/HST when they should not, or fail to charge it when they should. This often happens with exempt services, out-of-province sales, or contracts that were not properly reviewed for tax treatment. These errors can create inconsistencies between invoices, bookkeeping records, and filed returns.

7. Keeping incomplete records
If the CRA asks for backup and the paperwork is not there, that can quickly turn a simple question into a bigger problem. Bank statements, invoices, contracts, and sales reports all help support the return. Good records make it much easier to respond if the CRA comes calling.
If a CRA Letter Arrives

A CRA letter does not always mean something is wrong. In many cases, it is simply a request for clarification or supporting documents. The important thing is to open it right away, read the deadline carefully, and respond on time.
The next step is to gather the records mentioned in the letter and compare them to the GST return in question. If something does not match, it is better to understand the issue before replying than to guess. For small businesses, getting help early can prevent a small bookkeeping issue from turning into a larger reassessment.

If you receive a CRA letter, a practical response is to:
1. Read the letter fully and note the deadline.
2. Gather the requested invoices, receipts, and reports.
3. Compare the CRA’s questions with the filed GST return.
4. Correct any obvious errors before responding.
5. Reach out to us at Fulcrum Group if you are unsure, or if you have any questions regarding the supporting information requested.

8. A simple way to stay ahead
The easiest way to reduce CRA review risk is to keep GST organized all year, not just at filing time. Regular reconciliations, clean records, and careful review of ITCs go a long way. For small businesses, that usually means fewer surprises and less stress when tax season rolls around.

Closing section
Most GST reviews start with preventable errors, not major wrongdoing. When a business files consistently, keeps proper support, and responds quickly to CRA requests, it is much easier to stay in good standing. For small businesses, the goal is simple: make GST one less thing to worry about