Track Every Allowable Expense (Including the €10,000 Pre-Letting Relief) for Your Tax Return

There's a particular kind of dread that arrives every autumn for a self-managing landlord. The pay-and-file deadline is coming, the accountant (or Revenue Online Service) wants a figure for expenses, and the "system" for the whole year turns out to be a current-account statement, a shoebox of half-faded receipts, and a memory that a plumber was paid sometime around March. So you scroll. You guess. And somewhere in that scroll, real, legitimate deductions slip through — because a payment you can't categorise or evidence is a payment you won't claim.

The frustrating part is that these are your deductions. Every allowable expense you miss is rental profit you're taxed on unnecessarily, at your marginal rate. Getting expense tracking right isn't paperwork for its own sake — it's one of the highest-return hours a landlord spends all year. This guide covers exactly what you can claim, the reliefs people most often leave on the table, and a way to stop doing the whole thing from bank statements in November.

Why "sort it out at the deadline" costs you money

Reconstructing a year of expenses in one sitting fails in three predictable ways, and each one has a euro cost:

• You forget the small and the annual. The €18 monthly service charge, the once-a-year insurance renewal, the RTB registration fee, the €40 call-out — individually trivial, collectively hundreds of euro of deductions that never make the list because they're not top of mind in November.
• You can't tell a repair from an improvement. A line on a bank statement says "€2,400 – Murphy Building". Was that a deductible repair or a capital improvement relieved differently? Without a note and an invoice captured at the time, you're guessing — and a guess is exactly what you don't want if Revenue ever asks.
• You can't evidence it, so you don't claim it. The golden rule of Irish rental tax is that expenses must be vouched. Revenue can look for records, and a claim you can't back with an invoice or receipt is a claim you'd have to drop under scrutiny. Fear of that is why cautious landlords under-claim.

Capturing an expense the day it happens takes ten seconds. Reconstructing it eight months later takes an evening — and you still lose the ones you can't prove.

The full list of allowable expenses

Revenue allows the following categories of expense against Case V rental income. TenantSync maps every expense you record onto exactly these Revenue buckets, so your statement mirrors what Form 11 expects.

Categories reflect Revenue's Case V treatment as reflected in the TenantSync Tax Pack. Always confirm the current allowable list at revenue.ie.

What you can't deduct — and the traps

Knowing the non-allowable items matters just as much, because claiming them by mistake is what turns a routine return into a problem:

• Local Property Tax (LPT) is not an allowable expense against rental income. Record it for completeness, but it isn't deducted.
• The capital portion of a mortgage repayment is not allowable — only the interest is. If you claim the whole repayment, you've over-claimed.
• Improvements, not repairs. Replacing a worn boiler like-for-like is a repair. Adding an extension or upgrading to a materially better standard is capital and treated differently. The dividing line is genuinely easy to get wrong — which is exactly why an invoice and a note captured at the time is worth so much.
• Furniture and appliances aren't a one-off expense — they're relieved over time as wear and tear. Booking a new couch as a straight expense is a common error.
• Pre-first-letting costs generally aren't allowable — except through the specific pre-letting relief below.

Mortgage interest and the RTB link most landlords miss

For a leveraged landlord, mortgage interest is usually the single largest deduction — and there's a rule that catches people out. 100% of the interest on a residential rental mortgage is generally deductible, but the relief is conditional on the tenancy being registered with the RTB. Let a registration lapse and you don't just risk an RTB penalty — you can jeopardise your biggest tax deduction for that period.

This is why compliance and tax aren't separate jobs. TenantSync builds the link in on purpose: its Tax Pack applies mortgage-interest relief only where the tenancy is RTB-registered, and shows separately any interest that would be disallowed because a registration isn't in place. It's a computation that reflects the rule rather than hoping you remembered it — and a nudge to keep your registrations current, because they're worth real money.

The €10,000 pre-letting relief — the one people leave on the table

If you've taken a property that sat empty for a while and spent money getting it ready to let, this relief is for you — and it's routinely overlooked. Under Section 97A of the Taxes Consolidation Act 1997, you can deduct certain pre-letting expenses on a property that had been vacant for at least six months before you first let it, up to a cap of €10,000 per premises.

The essentials, as they currently stand:

• Vacancy test: the property must have been vacant for at least six months immediately before the first letting.
• Cap: up to €10,000 of qualifying expenditure, per vacant premises.
• Timing: the expenditure must be incurred in the twelve months before the property is first let as residential.
• Type of cost: it must be the kind of expense that would normally be allowable if incurred during a letting.
• Window: the relief applies to qualifying lettings up to 31 December 2027.
• Clawback: if you stop letting the property as residential within four years of the first letting, the deduction is clawed back.

The reason landlords miss it is simple: the qualifying costs are incurred before there's any rent, often before you're thinking about a tax return at all — the pre-let clean, the repairs, the safety checks, the advertising. If those receipts aren't captured as you spend, they're long gone by the time the relief would apply. Recording them against the property from day one is what turns "I think I spent a few thousand doing it up" into a defensible €10,000 deduction.

Capture as you go — two ways, both quick

The whole problem is the year-end reconstruction. Remove it, and expense tracking stops being a chore. TenantSync gives you two capture paths, and you can use both:

1. Log an expense in seconds

From the app on web, iOS or Android, add an expense against a property with an amount, a Revenue-aligned category, a date and a short description — the day the invoice lands, from your phone, before it's forgotten. That description is where you note "repair, like-for-like" or "pre-let redecoration," which is exactly the context that decides how it's treated later.

2. Let the bank feed do it for you

Connect your Irish bank once through PSD2 Open Banking — AIB, Bank of Ireland, PTSB, EBS, Revolut, N26 and more — and TenantSync's Smart Expense Engine derives expenses from your synced transactions and auto-categorises them into Irish Revenue expense categories, each with a confidence score. They arrive as drafts for you to review and confirm, so nothing is booked without your say-so, and a recurring cost like insurance or a service charge is caught automatically instead of being missed. It's the same Open Banking connection that powers TenantSync's real-time rent matching — one bank link, working on both sides of your accounts.

From scattered receipts to a Form 11-ready pack

Captured expenses are only half the value. The other half is what TenantSync does with them at year end. The Irish Landlord Tax Pack computes a Case V rental income & expenses statement for each property and tax year from data the app already holds — the matched rent, your categorised expenses, management fees and contractor costs. It:

• Groups every allowable expense under the correct Revenue bucket, so the split is the one Form 11 expects.
• Applies mortgage-interest relief only where the tenancy is RTB-registered, and flags interest that would be disallowed if it isn't.
• Adds wear-and-tear capital allowances at 12.5% a year on furnishings you've registered as capital assets.
• Separates the non-deductibles (LPT, capital items) so they're recorded but never wrongly claimed.
• Exports as a PDF and CSV you can hand straight to your accountant or use to complete your own Form 11.

It computes your net rental profit — gross rent, less allowable expenses, less RTB-eligible mortgage interest, less capital allowances. To be clear about what it is and isn't: this is your Case V rental profit and the allowable-expense breakdown behind it. It is not your total tax liability (which depends on your other income, marginal rate, USC, PRSI and credits), and it doesn't file anything with Revenue. It's the clean, evidenced statement that makes filing — or handing to an accountant — straightforward instead of stressful.

For letting agents and agencies

If you manage property for others, the year-end tax question multiplies by every landlord on your books. Each client wants a clear income-and-expenses position, and a vague one reflects on you. Because TenantSync scopes expenses and statements by landlord, branch and agency, an agency can produce a per-landlord rental income & expenses statement for each managed property — the management fees you charged, the contractor work you arranged and the costs you paid, already categorised — and export it as a professional PDF or CSV for the client's accountant.

It turns the annual "can you send me last year's figures?" scramble into a two-click export, and it's a genuinely differentiated thing to offer a landlord choosing an agent: we hand you a Form 11-ready statement every year.

How to get started

1. Start your free 14-day trial — no credit card required.
2. Download the app on iOS or Android, or use the web platform.
3. Add your properties and start logging expenses against them — or import what you have.
4. Connect your bank via Open Banking so new expenses auto-categorise as they happen.
5. Generate your Tax Pack at year end and export it for your Form 11 or your accountant.

Frequently asked questions