RPZ rules can limit how quickly a landlord raises rent, which may reduce expected rental growth and affect a property's yield, valuation or appeal to investors. They can also provide more predictable income and help reduce turnover, potentially lowering letting and vacancy costs. The financial impact depends on the property's location, purchase price, mortgage costs, allowable rent increases and whether any exemption applies. Rules and exemptions can change, so check the latest guidance on gov.ie or with a qualified property adviser before investing.