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Sustainable business bookkeeping works like any other bookkeeping: the CRA cares about what you paid, when, and what it was for, not whether the purchase was green. Keep the records for six years from the end of the last tax year they relate to. Anything tied to property you depreciate, such as solar panels or a heat pump, you keep for as long as you own it and after.
Keep your records for six years from the end of the last tax year they relate to, unless you have permission from the CRA to destroy them earlier.
Keeping Records (RC188), canada.ca
What changes when your business goes green?
Less than the marketing suggests. There is no separate ledger the CRA asks for. What changes is that you buy different things, and some of them are capital purchases rather than everyday expenses.
So the first job is sorting. A reusable-packaging order is a normal expense. A rooftop solar system is equipment that gets written off over several years. Mix the two up and your income is wrong in both directions.
Give green spending its own account or tag in your software. It costs nothing, and it gives you one report when a lender, a customer or an auditor asks what you spent on sustainability. A small bakery in Fredericton that switches to compostable boxes and also installs a heat pump would tag both, then book one as a supply cost and the other as equipment.
How do green purchases get booked?
The table shows the usual home for common items. Class rules are set by the CRA, so check the class description before you claim anything.
| Purchase | Usual treatment | Keep on file |
|---|---|---|
| Recycled or reusable supplies | Current expense | Invoice, proof of payment |
| Solar, heat pumps, waste-heat or other clean energy equipment | Capital cost, possibly Class 43.1 (30% declining balance) | Invoice, spec sheet, install date |
| Zero-emission vehicle | Capital cost in its own CCA classes (54 to 56) | Purchase contract, use log |
| Grant, rebate or utility incentive | Reduces the expense or the capital cost | Approval letter, payment record |
| Audit or certification fees | Normally a business expense, but we couldn’t confirm a special rule | Invoice, engagement letter |
The first-year write-off for clean energy equipment has been changing. The CRA’s accelerated investment page shows a phase-down for property available for use from 2024 to 2027, while other CRA material describes a newer, bigger first-year rule for property acquired from 2025. We didn’t sort that out, so read the current CRA page for your acquisition date before you file.
What do you do with a grant or rebate?
You subtract it. The CRA says a grant, subsidy or rebate you receive for depreciable property comes off that property’s capital cost. For an expense, it comes off the expense it paid for. Only when it can’t be tied to either does it go in as other income.
That means the cheque isn’t a windfall in your books. Record it against the purchase it funded and file the approval letter with the invoice. If you repay part of it later, the entry needs adjusting too, so keep that correspondence.
A worked example with $40,000 of equipment
Say an Ontario business buys $40,000 of clean energy equipment. The GST and HST calculator puts 13% HST at $5,200, so the invoice totals $45,200.
If you’re an HST registrant using the equipment in your business, the $5,200 is normally recovered as an input tax credit rather than booked as cost. The CRA treats input tax credits as government assistance too, so they reduce the capital cost. Your capital cost starts at $40,000.
Now add a $10,000 grant. The capital cost you depreciate falls to $30,000. Forget the grant and you’d claim write-offs on $10,000 you never paid.
If the business is a small corporation, the savings show up at the corporate rate. On $100,000 of taxable income in Ontario, the corporate tax calculator shows $11,696 for calendar 2026. Ontario cut its small business rate on 1 July 2026, so that figure is a prorated blend, not a published rate, and a different year end gives a different result.
Sole proprietors can run their own version through the self-employed tax calculator. Its deductions lower income tax but not CPP, so read the output with that in mind.
Can you do the bookkeeping yourself?
For a small shop, usually yes. Nothing about green purchases needs special software. What matters is a steady habit: file the invoice the day it arrives, tag it, and reconcile the account once a month. A shoebox of faded receipts in March is what turns a simple grant claim into a headache. If the numbers get bigger or the equipment is complicated, a bookkeeper or accountant is worth asking, but that’s your call and a separate business from this site.
Mistakes that cause trouble
The common one is claiming green spending without paperwork. A receipt that says “supplies” won’t back up an equipment claim. Get the invoice with the model, the date and the amount.
Another is treating a grant as income and also deducting the full cost. You get taxed on money that was never yours to keep. Then there’s a vehicle used partly for personal trips: if the business share is below 90%, the CRA spreads the input tax credit reduction into the following year, and a mileage log is the only real defence.
And be careful with sustainability claims you make to customers. Bookkeeping can show what you spent. It can’t show that your product is greener than a competitor’s, and this page doesn’t try to.
Finally, don’t shred old files early. Destroying records before the six years are up needs written CRA permission, and Form T137 is the usual route. Records for property you still own are worth keeping well beyond that. Staff in a new green role also need their own payroll remittance tracking.
What this page is based on
The six-year record-keeping rule comes from the Canada Revenue Agency‘s business record pages. The grant rules come from the CRA’s page on grants, subsidies and rebates in its capital cost allowance section. The class descriptions for clean energy equipment come from the CRA and Natural Resources Canada, and the tax figures in the example come from the calculators on this site, using 2026 federal and Ontario data. The Clean Technology investment tax credit is up to 30% of the capital cost of eligible equipment, and other clean technology credits exist, so check the CRA before relying on one. This site has no tie to the CRA or any government.
Frequently asked questions
Do I need separate books for green spending?
No rule requires it. A separate account or tag just makes it easy to report what you spent.
How long do I keep records for solar panels or similar equipment?
Keep them for as long as you own the property, and after that. The CRA says records on long-term acquisitions and disposals have no end date.
Is a green grant taxable?
The CRA says a grant first reduces the expense or the capital cost it paid for. Only an amount that can't be tied to either goes in as other income.
Can I claim the HST on green equipment?
A registrant can normally claim input tax credits on business purchases, as long as you hold the supporting documents. The credit then reduces the capital cost.
Does the CRA accept a sustainability report as a record?
No. It wants the invoices, receipts and bank records behind each entry.
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