RTB Registration Without the Headache: Automating Tenancy Compliance in 2026

Every tenancy in Ireland needs to be registered with the Residential Tenancies Board within one month of commencement, and re-registered every year after that. The fee is small, the form is short, and yet the RTB enforcement reports still show thousands of late registrations every quarter.

It is not because landlords do not know. It is because registration is the kind of repetitive, time-bounded task that human memory is bad at. You set up a tenancy in March, you forget about it in October, and by March of the following year your re-registration is overdue.

This piece looks at exactly what the RTB requires in 2026, what it costs to get it wrong, and how to remove the manual layer from the workflow entirely.

What the RTB actually requires in 2026

For every new tenancy, the landlord must register within one month, paying the per-tenancy fee. The registration must include the property address, the landlord’s PPS number or company number, the tenants’ names and PPS numbers (with their consent), the rent, the deposit, and the tenancy commencement date.

For every existing tenancy, the landlord must re-register annually on the anniversary of the tenancy commencement, with the same data refreshed. If any data has changed (rent, tenant names) the system must be updated.

For tenancies in Local Authorities and AHBs, the same registration requirement applies, with the social-housing tenancy flag set so the differential-rent context is captured.

What it costs to get this wrong

Three categories of cost.

• Direct fines. Late registration carries a doubled fee. Persistent non-registration is a Class C offence with fines up to EUR 4,000, and the RTB has been more visible about prosecutions since 2024.
• Loss of dispute remedies. A landlord who has not registered cannot serve a valid notice of termination and cannot bring a dispute to the RTB. The tenant can still bring a dispute against the landlord.
• Tax exposure. Mortgage interest deductibility for rental income is contingent on the tenancy being registered. An unregistered tenancy may produce a Revenue claim for back tax.

For a single property, this is annoying. For a 200-unit PMC, this is a board-level risk that surfaces during fund or bank diligence, the same risk we explored in our analysis of fragmented software.

Why the manual workflow fails

The typical manual workflow is a calendar reminder set when the tenancy is signed. Within twelve months, one of three things has usually gone wrong: the property has changed hands within an agency, the tenant has been added without re-registering, or the rent has been reviewed without updating the RTB record.

The deeper problem is that registration is not a one-time event. It is a recurring obligation that interacts with every other event in the tenancy. The right fix is to make registration a side effect of the system that already holds the tenancy data, not a separate task.

How Rentalize handles this for you

Rentalize Core is integrated with the RTB API. New tenancies are registered automatically when the lease is created in the system. Annual re-registrations are queued 30 days before due date, processed in a single batch, and reconciled against the RTB confirmation. Rent reviews and tenancy changes update the RTB record in the same workflow that updates the rent account.

For 1-10 property landlords, Rentalize 360 does the same thing on a phone. The full PMC playbook ties registration into rent collection through Rentalize Pay and tenant selection through Rentalize Select.

The point is not the API integration in itself. The point is that no human ever needs to remember to register a tenancy. That is the only registration model that scales.

Frequently asked questions

Is RTB registration mandatory for all tenancies?

Yes, for all private rental and AHB tenancies. Local Authority tenancies have their own registration regime.

What is the fee for RTB registration in 2026?

The standard per-tenancy fee plus an additional fee for late registration. Always check the RTB site for the current figure.

Do I need to re-register every year?

Yes. Annual re-registration is required on the anniversary of the tenancy commencement.

What happens if my tenancy is not registered?

You cannot serve a valid notice of termination, you cannot bring a dispute to the RTB, you may lose mortgage interest deductibility, and you can be fined up to EUR 4,000.

Can software register tenancies on my behalf?

Yes. Rentalize Core uses the RTB API to register and re-register tenancies automatically and reconciles the confirmations into the tenancy file.

If you would like to see how Rentalize handles this in practice, you can book a 20-minute walkthrough. We will use one of your own properties as the worked example.