This guide is written so you can lift sections straight into a client email or a landlord information pack. It pairs with our fuller March 2026 rentals playbook and our national rent cap field guide — link clients to those when they want the detail.

Why the reforms are an agent's opportunity, not just a compliance headache

Every landlord in the country got the same news at once, and almost none of them read the legislation. What they have is a vague, anxious sense that "the rules changed" and that getting it wrong is now expensive. That gap — between the headline and the practical answer — is exactly where a good letting agent earns their fee.

The reforms arrive as Ireland's small-landlord base continues to shrink and consolidate; the landlords who stay are more valuable, and more nervous, than ever (we covered the pattern in the landlord exodus). An agent who can calmly explain what each client must do — and prove it's handled — becomes indispensable. An agent who fumbles the first rent review under the new cap, or advises a large landlord they can sell with vacant possession when they can't, loses the client and possibly faces a claim.

The four reforms, in one place

Strip away the noise and the March 2026 package comes down to four moving parts. Everything you'll advise a client on sits inside one of them.

The rest of this guide takes each one and turns it into something you can say to a client. First, though, the single fact that governs all four.

The dividing line every client must understand: existing vs new tenancies

If a landlord takes only one thing from you, make it this: 1 March 2026 is a hard line in the law. The rules that apply to a tenancy depend on when that tenancy was created.

• Tenancies created before 1 March 2026 continue under their existing framework — including existing Part 4 security of tenure. They do not automatically convert into Tenancies of Unlimited Duration. But they do follow the national rent cap on any rent review.
• Tenancies created on or after 1 March 2026 run under the new regime: a Tenancy of Unlimited Duration on a rolling six-year cycle, with termination rights that depend on whether the landlord is small or large.

That creates a dual system that will run for years. A single landlord — or a single agency book — can hold both kinds of tenancy side by side, each governed by different rules. The practical consequence is unavoidable: you must know, and record, the exact commencement date of every tenancy, because that date decides everything downstream.

Reform 1 — The national rent cap (2% or CPI, whichever is lower)

Since 1 March 2026 the Rent Pressure Zone system has been replaced by a single national rent control that applies to every private tenancy and Student-Specific Accommodation in the State, regardless of location. On a rent review, the increase is capped at the lower of 2% or the rate of inflation, measured by the Consumer Price Index (CPI). CPI replaces the HICP used under the old RPZ rules.

What to tell the client, in one sentence: "There's no map to check anymore — every one of your rent reviews is capped at the lower of 2% or inflation, and 2% is a ceiling, not an entitlement, so when inflation is below 2% the lower figure governs."

There are narrow carve-outs: new apartments and Student-Specific Accommodation that commenced development on or after 10 June 2025 (with the required certification) have increases linked to CPI only, without the 2% ceiling — but that is inflation-only, not uncapped. For the full mechanics, the worked examples and the market-reset rules, point clients to our national rent cap field guide and the deeper walk-through in setting rent in Ireland under the new rules.

Reform 2 — Tenancies of Unlimited Duration and the six-year cycle

For tenancies created from 1 March 2026, the old fixed-and-Part-4 structure gives way to a Tenancy of Unlimited Duration that runs on a rolling six-year cycle. In plain terms:

• A new tenancy continues indefinitely, in repeating six-year periods, unless it's ended on a permitted ground.
• The tenant can end the tenancy at any time by giving proper notice.
• The landlord's ability to end it — and when — depends entirely on whether they're a small or large landlord (next section).

What to tell the client: "Any tenancy you start now is, in effect, a long-term commitment. You're not signing up to a one-year let with an easy exit — you're entering a six-year cycle, so tenant selection and clear documentation matter more than they ever did."

Reform 3 — The distinction that changes everything: small vs large landlords

This is the reform most of your clients haven't grasped, and it's the one that most changes what you can advise. The legislation splits landlords by the number of tenancies they hold — not the number of properties:

Because the count is per tenancy, a landlord with one building of four separately let apartments is likely a large landlord with four tenancies — a fact that surprises many clients who think of themselves as "small." A client sitting at three or four tenancies is exactly the person who needs advice before they let another unit, because that next tenancy can flip their entire classification.

One protection applies to all landlords and is worth stating plainly to reassure nervous clients: any landlord can sell a property with the tenant in situ at any time. Restricted termination rights don't trap their capital — they can still exit by selling with the tenancy in place.

Reform 4 — When rent can reset to market value (and the no-fault trap)

Under the reforms a rent stays constrained by the cap between tenancies unless a reset to market value is specifically permitted. According to the RTB, a reset is allowed where the previous tenancy ended because:

• the tenant left voluntarily;
• the tenant breached their obligations;
• the property no longer suited the tenant's needs; or
• a six-year Tenancy of Minimum Duration reached its end.

And the line every agent must hold with clients: you cannot reset to market value after a no-fault eviction. This is the government's guard against "economic evictions." If a landlord ends a tenancy without valid grounds, they forfeit the market reset — the constrained rent carries into the next tenancy.

What to tell clients with existing (pre-March) tenancies

Most of your book on day one is pre-March tenancies. Clients are often relieved to hear these aren't being rewritten — but there's still a short, specific brief for them:

• Your framework hasn't changed — except on rent. Existing Part 4 protections continue. But any rent review now follows the national cap: the lower of 2% or CPI, once every 12 months, with 90 days' notice.
• Don't assume a change of tenant unlocks market rent. Whether you can reset depends on how the last tenancy ended, and never applies after a no-fault eviction.
• The commencement date matters now more than ever. It's what proves this tenancy sits under the old framework — keep it documented and to hand.
• If you re-let after 1 March, the new tenancy is a new regime. Ending a pre-March tenancy and starting a fresh one means the replacement is a Tenancy of Unlimited Duration under the new rules.

What to tell clients with new (post-March) tenancies

Every tenancy your client starts now lands squarely under the new regime. The brief here is about setting expectations before they sign:

• This is a six-year commitment. The tenancy runs on a rolling six-year cycle and continues unless you have a permitted ground to end it.
• Your exit options depend on your size. Small landlord: additional grounds at the six-year mark and certain hardship/family grounds. Large landlord: breach or unsuitability only.
• Set — and record — the opening rent carefully. It anchors every future review, and if you ever claim a below-market position later, today's documented figure is your evidence.
• You can still sell at any time with the tenant in situ, whatever your size.
• Tenant selection is now a long-term decision. With turnover harder, screening and affordability checks matter more — see our note on fair income verification.

The agent's client action checklist

Here's a checklist you can run for each landlord client — and, lightly edited, forward to them. Working through it once per client turns "the rules changed" into a set of concrete, closed actions.

1. Classify the client. Count their tenancies (not properties). Confirm small (≤3) or large (4+), and flag anyone at the threshold for legal clarification before they let another unit.
2. Audit every tenancy's start date. Split the portfolio into pre-March (old framework) and post-March (new regime) so you always advise on the right rulebook.
3. Check rent-review status per tenancy. Confirm the last-review date, whether 12 months have passed, and calculate the lawful increase at the lower of 2% or CPI — never a reflex 2%.
4. Record how each tenancy ended (or will end) so it's clear whether a market reset is permitted, and never assume a reset after a no-fault eviction.
5. Confirm RTB registration and renewals are current across the whole book — the reforms don't relax registration, and gaps undermine everything else. See the bulk RTB compliance workflow.
6. Update tenancy documentation for new lettings to reflect the six-year Tenancy of Unlimited Duration and the client's reset rights.
7. Send each client their brief. A short, branded, small-or-large-specific summary with the line "we've checked this across your portfolio."
8. Set the review rhythm. Diary the next rent-review window and six-year milestone per tenancy so nothing is served early or missed.

Managing this across a whole book of clients

For a single landlord, the checklist above is an afternoon. For an agency, it's the same eight steps across dozens of landlord clients and hundreds of tenancies — each with its own start date, classification, review window and ending history. The rule doesn't get harder per tenancy; the bookkeeping does, and that's precisely where the professional risk sits when it's run on spreadsheets.

Three capabilities turn the reforms from an ongoing liability into a quiet, handled process across the portfolio:

Run this way, advising clients on the reforms stops being a per-tenancy research project and becomes a confident, consistent answer — the exact capability that renews management contracts. It's the same moat we describe in winning and keeping landlord clients, and it feeds directly into the per-client landlord report that proves it every month.

For landlords: the one-page takeaway

If you manage your own property rather than through an agent, the same reforms apply to you directly — and so does the liability. The essentials:

• Know your size. Count your tenancies. 3 or fewer keeps you a small landlord with more flexibility; 4 or more makes you a large landlord with tighter termination rights.
• Every rent review is capped at the lower of 2% or CPI, once every 12 months, with 90 days' written notice — wherever your property is.
• New tenancies are long-term. A letting you start now is a Tenancy of Unlimited Duration on a rolling six-year cycle.
• Rent only resets to market value in defined cases — and never after a no-fault eviction. Document how each tenancy ends.
• Keep your records straight. Start dates and ending reasons now decide your rights; a free rent-cap calculator gives you a compliant increase in seconds.

If you'd rather have the dates, reviews and notices handled for you, TenantSync's Starter plan is built for small landlords. For the full plain-English breakdown, read the March 2026 rentals playbook.

Frequently asked questions

What are the March 2026 rental reforms in Ireland?

From 1 March 2026 a package of reforms changed how Irish tenancies are regulated. The main elements are a national rent cap (a rent review is limited to the lower of 2% or the rate of inflation measured by CPI, replacing the old Rent Pressure Zone system), Tenancies of Unlimited Duration under which new tenancies run on a rolling six-year cycle, and a new distinction between small landlords (3 or fewer tenancies) and large landlords (4 or more) that shapes termination rights. Tenancies created before 1 March 2026 keep their existing framework but still follow the rent cap on reviews. Always confirm the current rules on rtb.ie before advising a client.

Do the March 2026 rules apply to existing tenancies?

Not in full. A tenancy created before 1 March 2026 continues under its existing framework and does not automatically become a Tenancy of Unlimited Duration. It does, however, follow the national rent cap on any rent review. The new six-year cycle and the reformed termination grounds generally apply to tenancies created on or after 1 March 2026, which is why the exact start date of every tenancy now matters and should be recorded. Verify the position for a specific tenancy with the RTB.

What is a Tenancy of Unlimited Duration?

Under the reforms, tenancies created from 1 March 2026 run as Tenancies of Unlimited Duration on a rolling six-year cycle. The tenancy continues indefinitely, in repeating six-year periods, unless it is ended on a permitted ground. A tenant can end the tenancy at any time with proper notice. For a landlord, the grounds available to end the tenancy — and when they can be used — depend on whether they are a small or large landlord. Confirm the detail on rtb.ie, as guidance is still being clarified.

What is the difference between a small and large landlord under the 2026 reforms?

The reforms distinguish landlords by the number of tenancies they hold. A small landlord holds 3 or fewer tenancies; a large landlord holds 4 or more. The classification is generally counted per tenancy rather than per property. Small landlords keep more flexibility, including additional grounds to end a tenancy at the end of a six-year cycle, such as sale, substantial refurbishment, family occupation or change of use, and certain hardship grounds. Large landlords are more restricted, typically limited to ending a tenancy for tenant breach or where the property no longer suits the tenant's needs. Edge cases near the threshold should be checked with legal advice.

Can a landlord still reset rent to market value after March 2026?

Only in defined circumstances. According to the RTB, a rent can be reset to market value where the previous tenancy ended because the tenant left voluntarily, the tenant breached their obligations, or the property no longer suited the tenant's needs, or at the end of a six-year Tenancy of Minimum Duration. A reset is not permitted after a no-fault eviction. Where a reset is allowed, the new rent must not exceed market rent and must be evidenced with three comparable properties from the RTB Rent Register.

What should a letting agent tell landlord clients about the March 2026 reforms?

Explain four things clearly: first, every rent review is now capped at the lower of 2% or CPI nationally, so location no longer decides the cap; second, tenancies created from 1 March 2026 are Tenancies of Unlimited Duration on a rolling six-year cycle; third, whether the client is a small (3 or fewer) or large (4 or more) landlord decides what termination rights they keep; and fourth, the start date and ending reason of every tenancy must be documented because they determine which rules and rent-reset rights apply. Position the agency as the adviser that keeps each client compliant, and confirm specifics on rtb.ie.

How does TenantSync help letting agents manage the March 2026 reforms across a portfolio?

TenantSync records each tenancy's start date and ending reason so it is clear which framework applies and whether a market reset is permitted, applies the lower-of-2%-or-CPI rent cap and returns a defensible figure per tenancy, tracks the six-year cycle and review dates with reminders, keeps RTB registration and compliance items current across every landlord client, and produces per-client landlord reports with a compliance status. For an agency it does this across the whole book, per landlord, with a timestamped audit trail.

Sources & further reading

Facts in this article are drawn from official and primary sources. Rental reform rules, CPI rates, notice requirements and the finer points of the small/large distinction can change — verify the current position on rtb.ie and gov.ie before advising a client or acting on any tenancy.

• Residential Tenancies Board — Rental law changes from 1 March 2026
• Government of Ireland — Reforms to the rental sector, starting 1 March 2026
• Residential Tenancies Board — Rent controls and rent reviews
• Residential Tenancies Board — Ending a tenancy and security of tenure
• Central Statistics Office — Consumer Price Index (CPI)
• Citizens Information — Renting a home: your rights and obligations