Landlord Mortgage Calculator

What this landlord mortgage calculator does

This landlord mortgage calculator estimates monthly mortgage repayments, total interest paid, total paid over the term, remaining balance over time, and the impact of overpayments for buy-to-let and other landlord borrowing scenarios.

Enter your loan amount, mortgage term, interest rate, mortgage type, and optional overpayments to instantly generate:

• Monthly repayment
• Total interest paid
• Total paid over the term
• Mortgage payoff date
• Interest saved from overpayments
• Time reduced from overpayments
• Full amortisation schedule
• Remaining balance by year
• Principal and interest breakdown

All calculations update instantly in your browser. No data is stored or transmitted.

This landlord mortgage calculator works globally. You can change country and currency in the header at any time.

Use it to model fixed assumptions for rental property financing, then compare repayment versus interest-only structures using the same shared mortgage engine.

How repayment mortgages are calculated

In repayment mode, monthly payments are calculated using standard amortisation with monthly compounding. Each payment includes:

• Interest on the outstanding balance
• Principal repayment

As the loan progresses, the interest portion decreases and the principal portion increases. By the end of the term, the remaining balance reduces to zero.

How interest-only mortgages are calculated

In interest-only mode, monthly payments cover only the interest charged on the outstanding balance. The principal does not reduce unless additional payments are made.

For many landlord scenarios, this helps model lower monthly cash outflow during the term, but the original principal still needs to be repaid, refinanced, or cleared through sale proceeds at the end.

How overpayments are modelled

You can include recurring or additional payments to see how overpayments affect your landlord mortgage.

The calculator recalculates the amortisation schedule to show:

• Interest saved over the term
• Reduction in total interest paid
• Earlier payoff date
• Updated remaining balance curve

Overpayments reduce the outstanding principal faster, which reduces future interest charged and can improve long-term equity position.

What your results show

After entering your details, the landlord mortgage calculator displays:

• Monthly repayment
• Total interest paid
• Total paid over the term
• Mortgage payoff date
• Interest saved (if overpayments are added)
• Time reduced (if overpayments are added)
• Remaining balance over time
• Annual amortisation schedule

You can adjust inputs at any time to model different rates, terms, mortgage types, or overpayment strategies for rental properties. Results update instantly so you can understand borrowing cost, balance reduction, and financing structure under a fixed-rate assumption.

Amortisation schedule

The amortisation schedule shows how your landlord mortgage balance changes over time.

For each year (or month), it displays:

• Interest paid
• Principal repaid
• Remaining balance

This helps you understand:

• How quickly equity builds in the property
• How interest is weighted in early years
• How the balance declines toward payoff
• The structural difference between repayment and interest-only landlord borrowing
• The long-term effect of additional payments

Assumptions and limitations

This landlord mortgage calculator provides deterministic estimates based on fixed inputs.

Results assume:

• A constant interest rate for the full term
• Monthly compounding
• No refinancing or rate changes
• No lender-specific charges, arrangement fees, penalties, or broker fees
• No rental income testing, stress testing, taxes, insurance, or legal fees

Actual landlord mortgage costs will vary depending on lender rules, rental coverage requirements, product fees, and local regulations. Always confirm details with your lender or broker before making financial decisions.

Frequently asked questions