Solar & EV installer tax: inventory, HST on rebates, and the warranty reserve

Inventory for a customer's roof, capital property for your own

Panels, inverters, racking and charger units bought to install on a customer's property are inventory, expensed as cost of goods sold when the job closes, and they never sit on a capital cost allowance schedule. The line blurs only when your business keeps equipment for its own use: a demo array on your shop, chargers installed for your own service fleet, or a company vehicle equipped to tow racking. That equipment is capital property, and certain clean energy and zero-emission equipment classes carry accelerated capital cost allowance rates, though the exact classes and percentages are technical enough that we confirm them against your specific equipment before filing rather than assume last year's treatment still applies.

The Clean Technology Investment Tax Credit is usually your customer's question

Ottawa has introduced a refundable federal credit, commonly discussed around 30 percent, for a taxable Canadian corporation that acquires certain clean-technology equipment, including solar-electricity generation equipment, for its own use. On a typical residential job, the customer is a homeowner rather than a taxable corporation, so the credit generally has no bearing on your invoice or your return. It becomes relevant when your customer is a business installing solar on a warehouse roof or an EV charger for its own fleet, and it becomes relevant to you directly only if your company retains ownership of installed systems, for example under a financing or power-purchase arrangement, rather than selling them outright. The credit has been phased in with labour conditions attached to the full rate, and both have moved since it was first announced, so we treat any percentage as a figure to confirm at the time of filing rather than a fixed number to quote a client.

HST follows the invoice, not the rebate paperwork

HST is charged on the contract price you actually invoice. When a rebate is assigned to you and netted off the price before tax, HST applies to the reduced, net amount, the same way a coupon reduces the taxable price at a retail till. When a rebate is paid to the customer separately by a program after the sale, it never touches your HST calculation at all, because your invoice was never reduced by it. Getting the sequence backwards, charging tax on the pre-rebate price when the rebate was actually a point-of-sale reduction, either overcharges the customer or understates your net tax owing, and both show up the same way on a review.

Because your input tax credits on imported panels, inverters and chargers are large relative to revenue, the GST/HST quick method almost always produces a worse result for an installer than it does for a service business with few purchases; the quick method trades away most of your input tax credits in exchange for a lower remittance rate, and that trade rarely favours a business buying equipment by the pallet. What the quick method is and who it suits explains the mechanics; for most installers, the answer is to stay on the regular method.

Warranty reserves are a bookkeeping fact and a tax add-back

A reserve you set aside on your financial statements for future warranty callbacks is prudent accounting and, on its own, not a deductible expense. CRA generally allows a deduction for warranty costs when the work is actually done and paid for, not when the estimate is booked, so a reserve recorded on the balance sheet is added back to income on the T2 and only deducted in the year a callback is actually completed. For a business carrying a multi-year workmanship warranty behind a twenty-five-year manufacturer product warranty, that timing gap between the accounting reserve and the tax deduction can run for years, and we track it as a standing reconciling item rather than rediscover it every filing season.

Equipment imports with tariff exposure are covered in more depth in our cross-border guide for solar and EV installers; the general engagement is described on our tax services page.

Source: CRA — RC4058, Quick Method of Accounting for GST/HST.