Security deposits are where most Calgary landlords get hurt. Not because the rules are complicated, but because the procedural deadlines are tight and the documentation standard at the Residential Tenancy Dispute Resolution Service (RTDRS) is exacting. A landlord who knows the rent rules cold and the eviction rules cold still routinely loses deposit disputes because they didn't do the inspection right, didn't return the deposit within 10 days, or claimed for something that isn't legally deductible. This is the long-form 2026 guide to Alberta security deposits.
The Maximum Deposit Is One Month's Rent
Under section 44 of the Alberta Residential Tenancies Act, the maximum security deposit is one month's rent. Not two. Not first-and-last. Not a deposit plus a pet fee. The combined total of every up-front amount labelled as a deposit, call it whatever you want, cannot exceed one month's rent. "Pet deposits", "key deposits", "cleaning deposits", "damage deposits": they all count toward the one-month cap.
If you collect more than one month's rent as a deposit, the excess is recoverable by the tenant at any time and you can be ordered to repay it with interest. Some landlords try to label additional amounts as "non-refundable fees", RTDRS routinely reclassifies these as deposits and orders repayment.
The Trust Account Requirement
Within two banking days of receiving a security deposit, you must deposit it into an interest-bearing trust account with a bank, treasury branch, credit union, loan corporation, or trust corporation operating in Alberta. The account must be separate from your personal or operating funds. Commingling deposit funds with your personal account is a regulatory breach with real consequences if the tenant files at RTDRS.
For self-managing landlords with one or two doors, the easiest approach is a single high-interest savings account at your bank, labelled clearly ("[Address] - Tenant Deposit Trust"). For multi-door portfolios, a single pooled trust account with internal sub-ledgers per tenant is acceptable. Property managers in Alberta who hold deposits on behalf of clients must operate a separate, audited trust account under RECA rules.
Deposit Interest: How Much, and When
Alberta's Security Deposit Interest Rate Regulation prescribes the interest rate paid on tenant deposits each calendar year. The rate is set by Service Alberta and has been near 0% in recent years given the low-interest environment, though it adjusts as broader rates move. The exact rate for the year is published on Service Alberta's website. Interest must be paid at the end of the tenancy along with any portion of the deposit you're returning to the tenant.
The interest calculation is annual compound interest, prorated for partial years. For a $1,750 deposit held for 18 months at 0.3%, interest is roughly $7.90. For longer tenancies and higher prescribed rates, interest can be meaningful, calculate it correctly even when small, because RTDRS will.
The Move-In Inspection Report Is the Foundation
Under section 27 of the RTA, a written move-in inspection report is mandatory. It must be completed within one week before move-in or one week after move-in, signed by the landlord and tenant, and a copy provided to the tenant. Without a signed move-in inspection, you cannot legally deduct from the deposit for damage. RTDRS routinely awards full deposit returns to tenants whose landlords skipped this step, regardless of how much actual damage exists.
What a strong inspection report looks like:
- Walk through every room with the tenant present.
- For each room: walls (condition, marks, holes), ceiling (stains, damage), floor (carpet condition, hardwood scratches, tile chips), windows (operation, screens, blinds), light fixtures (working, condition).
- Appliances: each one's make, model, and condition. Test that it functions.
- Mechanical: furnace filter date, thermostat function, water pressure, hot water at the tap.
- Detached structures: garage, shed, fence, deck, separately documented.
- Photograph every room, with the date visible (use the camera's date overlay or photograph a timestamped piece of paper in-frame).
- Both parties sign every page of the inspection report.
- Provide a complete signed copy to the tenant before leaving the property, keep your signed original.
The 10-Day Return Deadline
After the tenancy ends, you have 10 days to return the deposit plus prescribed interest, minus any legitimate deductions, along with a written statement of account itemizing each deduction. The 10-day clock starts on the day the tenant moves out and returns possession, not the day they give notice.
If 10 days is genuinely insufficient to determine final deductions, for example, a contractor invoice that isn't back yet, the RTA permits an extension by mutual agreement, or you can return the portion you're confident about and provide a final statement within a reasonable additional period. Document any extension agreement in writing. Sitting silent past day 10 is the most common landlord mistake and an automatic RTDRS loss in many cases.
What You Can Legally Deduct
- Unpaid rent (with documentation).
- Damage to the property beyond normal wear and tear (with photos, contractor invoice, or itemized cost calculation).
- Unpaid utilities for which the tenant was responsible under the lease.
- Cleaning costs if the tenant left the unit unreasonably dirty (with photos and invoice; routine end-of-tenancy cleaning is normal wear).
- Replacement of items the tenant removed that belonged to the property.
- Cost of replacing keys, garage remotes, or access fobs not returned at move-out.
What You Cannot Deduct
- Normal wear and tear, minor scuffs, paint fading, carpet matting from foot traffic.
- Repainting on a routine 3-5 year cycle unless the tenant caused unusual damage.
- Carpet replacement after normal use through a typical 5-7 year carpet lifespan.
- Improvements you made for the next tenant (new appliances, upgraded fixtures).
- Lost rent during a vacancy if you re-listed promptly (you must mitigate).
- Costs that exceed what a reasonable contractor would charge.
The wear-and-tear line is the most-litigated. RTDRS hearing officers apply a depreciation framework: paint has a 3-5 year useful life, carpet 5-7 years, appliances 10-15 years. A tenant who lived in the unit four years cannot be charged the full cost of repainting at move-out because much of that paint's useful life would have been consumed regardless.
The Move-Out Inspection
The move-out inspection mirrors the move-in inspection. It must be completed within one week before or after the tenancy ends, with the tenant given a reasonable opportunity to attend. If the tenant does not attend after being given proper notice, you may proceed without them, but document the notice and the missed appointment carefully.
The move-out report compares condition against the move-in report. Differences not explained by normal wear and tear are deductible. Photograph every difference and label each photo against the corresponding line on the move-in report. This linkage, "move-in: kitchen wall, no marks; move-out: kitchen wall, four nail holes", is what wins deposit disputes at RTDRS.
Pet Deposits: They're Not Legal in Alberta
This is the single biggest misconception held by Calgary landlords. There is no separate "pet deposit" in Alberta. Any amount labelled as a pet deposit must fit inside the one-month cap. The lawful way to manage pet risk is to fold the pet permission into the lease, require pet insurance, and rigorously enforce the move-out cleaning and damage standards from the same one-month deposit. Many landlords charge slightly higher monthly rent on pet-friendly units instead, which is permissible.
The Statement of Account: What It Must Contain
When you return the deposit, the written statement of account is a legal requirement, not a courtesy. A defensible statement includes:
- Tenant's name and rental address.
- Total deposit collected at move-in, dated.
- Prescribed interest calculated through the move-out date, with the applicable rate cited.
- Each deduction itemized separately, with a one-line description and the supporting invoice or calculation reference.
- Subtotal of deductions.
- Net amount being refunded (or net amount the tenant owes if deductions exceed deposit).
- The cheque number, e-transfer reference, or other payment method delivering the refund.
- Your signature and the date.
Send the statement and the refund together, by registered mail or e-transfer with a saved confirmation. If the tenant has provided a forwarding address, use it. If not, send to the last known address, the RTA does not require you to investigate further.
Documenting Damage Without Inflating Claims
The single biggest cause of deposit-dispute losses at RTDRS is over-reaching claims. A tenant who damaged a wall isn't responsible for repainting the entire room. A tenant whose dog scratched one corner of the floor isn't responsible for refinishing all the hardwood. RTDRS hearing officers consistently award only the proportional, depreciated cost of the actual damage caused, and they often discount further if the documentation suggests the landlord tried to take advantage of a real but minor incident to fund a broader upgrade.
The discipline: separate "this tenant caused" from "this needed updating anyway." Charge for the first; absorb the second. A claim of $4,200 for total wall repainting after a tenant with three nail holes is the kind of overreach that loses the entire claim because the officer no longer trusts your numbers.
When the Tenant Disputes the Deductions
If the tenant disputes your deductions, they have two years to file an RTDRS application for the return of the disputed amount. Your defence is the documentation chain: the signed move-in report, the signed lease, the photos, the move-out report, and the contractor invoices or itemized calculation. If any link is missing, the tenant wins.
Hearing officers heavily weight contemporaneous documentation. A contractor invoice dated three weeks after move-out is strong evidence. A handwritten estimate dated months later is weak. Photographs with metadata are strong. Photographs whose timestamp is the day of the hearing are not.
Frequently Asked Questions
Can a landlord keep the security deposit for carpet cleaning in Alberta?
Only if the carpet was left in materially worse condition than normal wear and tear, the lease imposed a cleaning obligation, or the lease specifically requires professional carpet cleaning at move-out. Even then, the deduction must be backed by a receipt and reasonable in amount. Routine post-tenancy carpet cleaning between tenants is typically the landlord's cost.
Can a landlord deduct for painting in Alberta?
Paint depreciates over a useful life of 3-5 years. A tenant in the unit for less than that period who damages walls beyond minor scuffs may be charged a prorated share of repainting cost. A tenant in for the full useful life cannot be charged for routine repainting.
What happens if a landlord doesn't return the security deposit in 10 days?
The tenant can file at RTDRS for the full return plus interest. Hearing officers often award the full deposit when no statement is provided within the 10-day window, even if some deductions would have been legitimate. The 10-day rule is unforgiving.
Can I keep the deposit if the tenant breaks the lease early?
Not automatically. The deposit can be used to offset unpaid rent or actual damages, but you have a duty to mitigate, re-list the unit promptly and accept reasonable applicants. If you mitigate properly and still have a rent loss, that loss is deductible. If you sat on the vacancy, it isn't.
Does the security deposit need to be paid by certified funds?
No. Any method is acceptable, but most Calgary landlords require certified funds or electronic transfer to confirm funds clear before move-in. Personal cheques are accepted but at the landlord's risk.
What if the tenant agrees in writing to a deduction that isn't legally allowed?
The RTA's deposit rules cannot be waived by agreement. Even with a signed acknowledgement, a tenant can later file at RTDRS for the disputed amount and win. Document your deductions to the legal standard regardless of what the tenant signs in the moment.
Can I deduct the cost of finding a new tenant from the deposit?
If the tenant broke the lease early and the lease included a lease-break fee or re-rental cost provision, you can deduct documented reasonable re-rental costs. You cannot deduct your time, your inconvenience, or amounts that exceed actual paid costs.
Do I need to pay interest on the deposit even if I held it for less than a year?
Yes. Interest is prorated for the actual period the deposit was held. Even a 4-month tenancy generates a small amount of interest that must be calculated and paid.
Bottom Line
Security deposits in Alberta are governed by a small number of strict rules: one-month cap, interest-bearing trust account, signed move-in inspection, 10-day return deadline, itemized written statement, no deductions for normal wear and tear. Get all six right and you'll win most deposit disputes that come at you. Get any one wrong and the tenant collects in full. The cost of doing this properly is a few hours per tenancy. The cost of doing it wrong is the entire deposit plus interest plus your credibility at any future RTDRS hearing. UrbanLease's RECA-licensed trust accounting handles every step of this for owner-clients under one flat fee.