Buy to Let Mortgage Calculator Ireland

Calculate buy-to-let mortgage costs, rental yield, and BTL mortgage requirements for investment properties

Open Calculator Back to Home

Buy to Let Mortgage Calculator

If you want to check the monthly loan cost for an investment purchase first, use the Mortgage Repayment Calculator Ireland.

You can also compare owner-occupier borrowing with our mortgage affordability tool, review after-tax income using the net income calculator Ireland, or browse the wider set of property mortgage calculators Ireland.

Results

Complete the form to see your BTL calculation

Buy to Let Mortgage Calculator Ireland

Use this Buy to Let Mortgage Calculator Ireland to estimate deposit needs, monthly mortgage costs, rental yield, and monthly cash flow for an investment property. It is designed for Ireland-based investors who want to test whether a purchase still makes sense once finance and property costs are included.

How This Calculator Works

Inputs Required

  • Property value and expected monthly rent
  • Deposit percentage for the mortgage
  • Interest rate and mortgage term
  • Monthly property costs and management fee level

What Results You’ll Get

Outputs Included

  • Required deposit and estimated loan size
  • Estimated monthly mortgage repayment
  • Gross rental yield
  • Estimated monthly cash flow after costs

What Is a Buy to Let Mortgage in Ireland?

A buy to let mortgage is a loan used to purchase an investment property that will be rented out rather than lived in by the borrower. In Ireland, these mortgages usually require larger deposits and often carry higher interest rates than owner-occupier loans. Lenders also pay close attention to rental income and whether the property can support the repayment.

How to Calculate a Buy to Let Mortgage

  1. Enter the property value and the deposit percentage required.
  2. Work out the loan amount after the deposit is removed.
  3. Apply the mortgage interest rate and term to estimate the monthly payment.
  4. Calculate annual rent as a percentage of the property value to estimate gross yield.
  5. Subtract mortgage costs, management fees, and other monthly expenses to estimate cash flow.

Buy to Let Mortgage Examples in Ireland

Example 1: €250,000 Investment Property

Property value: €250,000. Deposit: 20% or €50,000. Loan: €200,000. Monthly rent: €1,500. With interest and running costs included, the property may still produce positive monthly cash flow if expenses stay controlled.

Example 2: €350,000 Property With Higher Costs

Property value: €350,000. Deposit: 25%. Loan: €262,500. Rent: €2,000. If the rate is high and management fees are added, the yield may still look acceptable but monthly surplus can tighten quickly.

Example 3: Lower Rent Coverage

Property value: €300,000. Deposit: 20%. Loan: €240,000. Rent: €1,400. The gross yield may look reasonable at first glance, but once mortgage costs and expenses are included the monthly cash flow could turn negative.

Key Factors That Affect Your Results

  • Deposit size and loan-to-value level
  • Interest rate and mortgage term
  • Expected monthly rent
  • Property costs, void periods, and management fees
  • Tax treatment of rental income and allowable expenses

How to Improve Your Outcome

  • Increase the deposit to reduce monthly finance costs
  • Target stronger rental coverage before buying
  • Keep management and maintenance costs realistic
  • Compare mortgage rates carefully across lenders
  • Stress test the deal against lower rent or higher rates

Common Mistakes to Avoid

  • Looking only at gross yield and ignoring monthly cash flow
  • Using unrealistic rent assumptions for the area
  • Forgetting about management fees, repairs, and vacancy periods
  • Ignoring the effect of higher buy to let interest rates
  • Buying based on optimism instead of stress-tested numbers

FAQs

How much deposit do I need for a buy to let mortgage in Ireland?

Many lenders require a bigger deposit for buy to let than for owner-occupier mortgages, often starting at 20% or more.

How is a buy to let mortgage calculated in Ireland?

It is usually based on property value, deposit, rate, term, rental income, and property costs. Rental coverage is a major part of the assessment.

What affects buy to let mortgage results the most?

Deposit size, rate, rent level, and ongoing costs have the strongest effect on yield and cash flow.

Is this calculator accurate?

It is useful for planning and comparing deals, but actual lender decisions and property-specific assumptions may differ.

Can I improve my buy to let mortgage outcome in Ireland?

Yes. A bigger deposit, stronger rental income, lower costs, and better rates can all improve the result.

Why does monthly cash flow matter so much?

It shows whether the rent is likely to cover the mortgage and running costs. A deal with weak cash flow can become risky very quickly.