How GST/HST Should Show Up in Your Cash Flow Planning

You invoiced a client $10,000. They paid you $11,300. Your bank account looks great. Then the CRA remittance comes due and $1,300 leaves. If you spent any of that $1,300 in the meantime, you have a cash problem that has nothing to do with how well your business is performing.

This is one of the most common cash flow traps for growing businesses, and it is entirely avoidable with one simple change to how you plan.

Why GST/HST Is Not Your Money

When you collect HST on a sale, you are acting as a tax collector for the government. That money was never yours. It passed through your bank account on its way to the CRA. The problem is that it sits in the same account as your operating cash, and most business owners treat it like revenue until the remittance date hits.

This is an educational overview of how the mechanics work. For guidance specific to your business, your filing frequency, and your input tax credits, talk to your accountant or bookkeeper.

The trap gets worse as your business grows. At $500,000 in annual taxable revenue in Ontario, you are collecting roughly $65,000 in HST per year. That money cycles through your account in chunks every one, three, or twelve months depending on your filing frequency. The bigger the chunk and the longer the cycle, the bigger the hole when it leaves.

What Owners Get Wrong

The most common mistake is reading the bank balance and making spending decisions based on the full amount. You see $80,000 in the account. You feel comfortable. You hire someone, buy equipment, or pay a bonus. Then the quarterly HST remittance is $18,000 and suddenly you are short on payroll.

The second mistake is treating input tax credits (ITCs) as a windfall rather than planning for them. You may be entitled to claim ITCs on business expenses, which reduces your net remittance. But counting on a specific ITC amount before your bookkeeper has confirmed it is a form of wishful cash flow planning.

The Fix: Treat HST as a Liability From Day One

The single most effective change you can make is to separate collected HST from operating cash the moment it hits your account. Some businesses do this literally, by moving the HST portion to a separate savings account as soon as a payment is received. Others do it on paper by flagging the liability on a running spreadsheet.

Either way, the goal is the same. Your real operating cash balance should never include collected HST. If you can only see one number in your bank app, that number is misleading you.

How It Should Show Up in Your Cash Flow Forecast

A proper 13-week or monthly cash flow forecast handles GST/HST in two places.

1. Inflows: Record the full invoice amount you expect to receive, including HST. This is the actual cash entering your account.
2. Outflows: Create a separate line item for HST remittances on the dates they are actually due. Do not bury them in "other expenses." A named line item makes the obligation visible and stops it from sneaking up on you.

When you look at the forecast this way, your net available cash is what remains after accounting for the remittance obligation. That is the number you make spending decisions from.

The CFO Perspective: One Example

A professional services business was filing HST quarterly. Revenue was growing and cash looked healthy every month. The owner was using the bank balance to decide whether to bring on contractors and cover project costs.

When we built out a proper cash flow model, we found that in the month before each quarterly remittance, the effective cash cushion dropped by nearly $20,000 more than the owner expected. The pattern was consistent and predictable, but invisible because there was no dedicated line item for the HST liability in how the owner was tracking cash.

Once we added the remittance dates to the forecast, the owner could see the dip coming three months out and plan around it. Hiring decisions shifted slightly. A small cash reserve was maintained through the pre-remittance month. The stress disappeared.

What to Do About It

1. Find out your filing frequency. Annual, quarterly, and monthly filers each face different timing and different risk levels.
2. Add a dedicated HST remittance line to your cash flow forecast on the dates payments are due. Do not estimate, use your actual filing schedule.
3. Never include collected HST in your available cash balance when making spending decisions. Subtract it first.
4. Ask your bookkeeper what your net remittance has been for the last four quarters. Use that as your baseline for forecasting the obligation.
5. If you have not been tracking this, set up a separate savings account and move the HST portion of every receipt into it on the same day you receive the payment. Even a rough estimate beats nothing.

GST/HST is not complicated once it is visible in your plan. The problem is almost always that it is hidden in a combined bank balance until the bill arrives. If you want to build a cash flow model that actually reflects what you have to work with, book a free call at peterxiacpa.com/book.

Next step: see it in your free Instant CFO Snapshot.