Five areas decide whether a small business closes 2026 with clean records or carries CRA penalties into the new year, according to Accounting Firm Mississauga.
MISSISSAUGA, Ontario, October 14, 2026 — Mississauga accounting firm that erves businesses throughout Peel Region has published five small business bookkeeping priorities. The list is received 10 weeks before the end of the year. Each priority carries a CRA deadline, a rate or a penalty that applies in 2026.
The firm built the list from the errors it corrects most often in new client files. Most penalties trace back to records that were never kept, remittances sent a week late and CRA letters nobody opened. Those three habits cost owners more than any tax planning saves.
The Five Bookkeeping Priorities for Small Business Owners
The firm ranks the priorities by the cost of getting each one wrong. Record keeping sits first because every other item depends on it. Payroll and sales tax follow, since both carry monthly deadlines and automatic penalties.
1. Keep One Set of Books and Retain It for Six Years
You must keep records that support every figure on your return. The CRA requires those records for six years from the end of the last tax year they relate to. A business that cannot produce them loses the deductions they support.
The records the CRA asks for first are sales invoices, supplier receipts, bank and credit card statements, payroll registers and a mileage log for any vehicle claim. Digital copies are accepted. The paper original can go once the scan is legible and backed up.
Mixed personal and business accounts remain the most common problem in new client files. Separate bank and credit card accounts resolve most of it. Monthly reconciliation then catches the rest while your receipts still exist.
Six years feels distant until a reassessment arrives for a year you barely remember. Owners who reconcile monthly answer a CRA query in an afternoon. Owners who do not spend weeks rebuilding a year from bank statements.
2. Register for GST/HST on Time and File Every Period
A business loses its small supplier status once taxable sales pass $30,000 in a single calendar quarter or over four consecutive quarters. Registration is then due within 29 days. From that point you charge 13 percent HST on most sales in Ontario.
Late returns carry a penalty of 1 percent of the balance owing plus 0.25 percent for each full month the return is late, up to 12 months. Interest applies on top at the CRA prescribed rate, currently 7 percent and compounded daily. A missed quarterly return therefore costs more every month it stays open.
File on time even when you cannot pay in full. The penalty attaches to the late return, not the late payment. Interest on an unpaid balance is far cheaper than penalty plus interest on an unfiled one.
Input tax credits are the other side of the ledger. The CRA allows them only where you hold a supplier invoice that shows the supplier’s GST/HST number. Receipts that are missing or illegible cost you the credit, not the supplier.
The quick method remains available to businesses with annual taxable sales of $400,000 or less, including HST. Service businesses with few taxable purchases often keep more under it. The election must be filed with the CRA and reviewed each year as your sales change.
3. Run Payroll on the 2026 Rates and Classify Workers Correctly
Payroll deductions changed on January 1, 2026. The figures below apply to every pay run this year.
- CPP: 5.95 percent on earnings between $3,500 and $74,600, a maximum of $4,230.45 each for the employee and the employer.
- CPP2: 4 percent on earnings between $74,600 and $85,000, a maximum of $416 each.
- EI: 1.63 percent on earnings up to $68,900, a maximum of $1,123.07 for the employee. The employer pays 1.4 times that amount, or $1,572.30.
- Remittance: Regular remitters send deductions by the 15th of the month after the pay date.
- T4 slips: Due by the last day of February 2027. February 28 falls on a Sunday, so the deadline moves to Monday, March 1, 2027.
Worker classification sits alongside the rates. A contractor who works set hours, uses your tools and serves no other client is an employee under the CRA’s tests. The CRA reads the working relationship, not the invoice.
When the CRA reclassifies that worker, you pay both shares of CPP and EI for the years in question. A penalty of 10 percent of the amounts you failed to deduct is added. A second failure in the same year, made knowingly or through gross negligence, raises the penalty to 20 percent.
4. Track Corporate Deadlines and Instalments
An incorporated small business must file its T2 return within six months of its fiscal year end. The balance owing is due earlier, two months after year end for most corporations. Canadian-controlled private corporations claiming the small business deduction get three months.
Instalments catch owners who had a profitable year for the first time. The CRA expects tax to be paid through the year, not in one amount after it ends. A corporation owing more than $3,000 in tax pays monthly, or quarterly where it qualifies as a small CCPC with a clean compliance history.
If you run a sole proprietorship and owe more than $3,000, your instalments fall on March 15, June 15, September 15 and December 15. Missed or short instalments draw interest at 7 percent, compounded daily, from each due date. The December 15 payment is the one owners forget, and the interest runs until the balance is settled in the spring.
5. Register for CRA My Business Account and Read the Online Mail
CRA correspondence for businesses now arrives as online mail by default. Businesses that registered a business number on or after May 12, 2025 receive it through My Business Account. Existing businesses moved to online mail on June 16, 2025, unless they filed Form RC681 to keep paper.
If you have not registered, you will not see a reassessment, a review letter or a demand to file until the deadline has passed. Only an owner, partner, director or officer on the CRA’s file can create the account. Your accountant cannot register it on your behalf.
Once the account exists, you can authorize the firm through Represent a Client in minutes. The firm then receives the same notices and answers them before interest and penalties build. The account costs nothing and prevents the surprises that cost the most.
Why These Priorities Matter More in 2026
Three changes in the past 18 months raised the cost of loose bookkeeping. The move to online mail means missed letters, rather than misunderstood rules, now drive most of the penalties the firm corrects. A letter that sits unread in an account nobody checks still starts the clock.
The Voluntary Disclosures Program changed on October 1, 2025. An unprompted application now receives 100 percent penalty relief and 75 percent interest relief. An application made after the CRA has made contact receives up to 100 percent penalty relief and 25 percent interest relief. If you find an old error, you gain by disclosing it before a letter arrives.
The CRA also matches more data than before. T4, T4A, T5 and GST/HST filings are compared against reported income automatically. A business whose books disagree with its own slips invites a review it would otherwise never face.
What a Mississauga Accounting Firm Does for a Small Business
Owners searching for a Mississauga accounting firm usually want three things answered. What the firm handles, what it costs and when it makes sense to hire one rather than keep the books in-house.
Accounting Firm Mississauga provides monthly bookkeeping, GST/HST filing, payroll, corporate tax returns and CRA correspondence for small businesses across Mississauga, Brampton and the wider Greater Toronto Area. The team works in cloud accounting platforms, so you see the same figures your accountant sees. Questions get answered from live numbers rather than last quarter’s.
Fees are set per month based on transaction volume, payroll headcount and filing frequency, and are quoted before any work starts. The point at which outsourcing pays for itself is usually the first missed remittance or the first CRA letter. One late-filing penalty on a GST/HST return often exceeds a quarter of bookkeeping fees.
For the rest of 2026 the firm is offering a year-end bookkeeping review to new clients. The review checks the five priorities above against your records and reports what to fix before December 31. You can book the review through the firm’s website.
About Accounting Firm Mississauga
Accounting Firm Mississauga is a project of Bestax. It provides bookkeeping, tax, and advisory services to small and medium sized businesses in Peel Region and across Ontario. The firm serves owner-managed companies, professionals and real estate investors, with a focus on CRA compliance and clear monthly reporting.
