Ontario Rent Arrears Calculator

The ledger is built as a list of dated events in chronological order. Each rental period produces one rent charge on its due date. Post-termination compensation produces its own charge, strictly after the last rent period. Payments, ordered amounts and deposit credits are posted on their own dates, and a running balance is carried down the column. Nothing compounds and no interest is added to unpaid rent unless you separately enable the order-interest section.

Each rent period date is rebuilt from the original due day you entered and the month it falls in, rather than being rolled forward from the previous date. Where a month is shorter than the due day - a 31st due day in February, for example - that month's charge falls on the last day of the month, and the following month returns to the 31st. A final part-period is charged in full unless you turn proration on, in which case it is charged as the monthly rent multiplied by the days from the due date to the arrears end date, counting both the first and last charged day, over the days in the full period. That is this calculator's stated model, not a universal statutory formula. A final period charged in full covers every day of that period, so compensation that overlaps any of those days is rejected rather than charged twice; the tool never silently switches proration on to resolve the overlap. Daily compensation defaults to the monthly rent × 12 ÷ 365, and you can override it with a figure taken from the order or the agreement. Compensation days are counted inclusively: 1 July to 15 July is 15 days, not 14.

Amounts are held at full precision through the calculation and rounded to cents for display, so a printed ledger adds up to the displayed total without a stray cent.

• A period-by-period rent schedule generated from the monthly rent and due day, with optional proration of a final part-period.
• Any number of dated payments, credited in chronological order against the running balance.
• Deliberate rent-deposit treatment: no credit by default, an end-of-tenancy credit, or a custom credit on a date you choose.
• Deposit interest as a separate credit line, so it can be traced independently of the deposit itself.
• Post-termination daily compensation as its own charge, non-overlapping with rent, inclusive of the first and last day.
• Other ordered amounts, such as the application fee, on their own dated lines outside the rent total.
• An optional simple-interest calculation on an existing order, with its own rate, dates, payments and allocation assumption.

• Charging rent and post-termination compensation for the same day. Compensation replaces rent after termination; overlapping them double-counts the period and undermines the whole ledger.
• Crediting the deposit by reflex. In a continuing tenancy the deposit is generally applied to the last rental period rather than to ongoing arrears, so crediting it can understate the claim; in a termination-based order, failing to credit it overstates the claim.
• Forgetting deposit interest. It is owed to the tenant and is generally credited at the same time as the deposit itself.
• Entering payments as one lump sum at the end of the period. The running balance is then wrong for every day between the real payment dates.
• Entering the rent the tenant has been paying instead of the lawful rent under the agreement and any valid increase notice.
• Putting utilities, NSF charges or damage into the rent figure. They are separate lines with separate rules, and mixing them makes the rent total unverifiable.
• Counting the compensation window exclusively. This tool counts both the first and the last day, so a 1-15 July window is 15 days.
• Switching proration on for one period and off for another. Pick one basis and apply it consistently, or the totals will not reconcile.

• Reconcile the lawful monthly rent and the due day against the tenancy agreement and any notices of rent increase.
• Reconcile every payment line against bank, e-transfer or receipt records, and confirm the payment total.
• Confirm the deposit treatment matches the application you are actually bringing and the tenancy status.
• Confirm the termination date and re-check that no day appears as both rent and compensation.
• Move anything that is not rent onto its own line, and drop anything you cannot support with a document.
• Re-run with the opposite proration setting, and with the deposit both credited and not, so you know the range the figure sits in.
• Take advice from a lawyer or licensed paralegal before filing, serving, or paying on any figure produced here.

Legal information reviewed: 21 August 2026. Checked against the official sources listed on this page. Rates, fees and rules change; confirm anything you rely on.

Part of the ledger reflects rules that apply whatever the parties think, and part reflects choices you made in the form. Separating them tells you which figures are arguable and which are not.

• Print the ledger and file each supporting document behind the line it proves: agreement, increase notices, deposit receipt, payment records, notice of termination and proof of service.
• Note the date the ledger runs to. Rent keeps accruing, so a total quoted without its date will not match the figure at the hearing.
• Where your application total and your current ledger total differ, prepare a short reconciliation rather than leaving it to be raised against you.
• Check the current fee and form requirements on the Landlord and Tenant Board's own site before filing; fees and forms change independently of this page.
• If a rent increase is in issue, confirm it separately before treating the higher rent as the lawful rent.
• Read the companion guide for the legal and procedural context, then take advice on recoverability before serving or filing.

The legal statements on this page were checked on 21 August 2026 against the consolidated Residential Tenancies Act, 2006 on Ontario's e-Laws service (sections 86, 87, 88 and 106) and against the Landlord and Tenant Board's published forms and Interpretation Guideline 11 on rent arrears, all linked below. Board guidelines are interpretive guidance rather than law, they are revised from time to time, and application fees change independently of them; confirm the current version before relying on any of it.

At this review the introduction, the worked examples, the methodology table, the limits, mistakes and verification sections, and the fixed-rules table were added or expanded. The calculation engine is unchanged: rent by period, compensation strictly after termination and counted inclusively, payments in date order, and deposit credits only where you select them.

Correction note, 12 September 2026. The rent schedule was corrected: each period date is now rebuilt from the original due day rather than rolled forward, so a 31st due day no longer drifts past February or skips a month. The arrears end date is now stated explicitly as the last day included, and a prorated final period counts both the first and last charged day; the worked examples were recalculated on that basis. A final period charged in full is now treated as covering every day of that period, and overlapping compensation is rejected rather than charged twice. Deposit interest was separated from the deposit itself: the s. 106(3) attribution was wrong and has been replaced with s. 106(6), (7), (9) and (10), and verified unpaid interest can now be credited independently of the deposit. The s. 87(4) description was narrowed to the termination-order context. Input validation was tightened so incomplete rows and enabled sections block the result, copy and print instead of being silently dropped, and the copy output now separates interest accrued on an existing order from the balance on it. The calculation engine's underlying method, the published date and the review date above are otherwise unchanged. This is an editorial correction, not a certified or legal review.