FinToolSuite

Mortgage Broker Fee Calculator

Updated April 17, 2026 · Mortgage · Educational use only ·

Compare broker fee structures.

Compare a flat broker fee against a percentage-of-loan fee to see which costs more. Enter loan amount to see which structure costs less for your loan size.

What this tool does

Enter loan amount, flat fee, and percentage-of-loan fee. The tool shows which structure costs less for your loan size.


Enter Values

Formula Used
Loan amount
Flat fee
Percentage fee

Spotted something off?

Calculations, display, or translation — let us know.

Disclaimer

Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.

Mortgage brokers charge either a flat fee (500-1,500 typical) or a percentage of the loan (0.3-1% typical). Larger loans favour flat fees. Smaller loans sometimes favour a percentage if the percentage is low. A 300,000 loan at 0.5% = 1,500; a 500 flat fee wins easily at that size. A 50,000 loan at 0.5% = 250; the flat 500 loses.

Quick example

With loan amount of 300,000 and flat fee quote of 1,000 (plus percentage fee quote of 0.5%), the result is 500.00. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.

Which inputs matter most

You enter Loan Amount, Flat Fee Quote, and Percentage Fee Quote. Frequency and unit price pull the total in different directions. The biggest surprise for most people is how small recurring amounts compound into large annual figures — that's where this calculation earns its keep.

What's happening under the hood

Direct comparison of both fee structures. Does not include any lender-paid proc fee which is separate. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.

What the headline rate hides

Lenders quote a rate; what you pay is a blend of that rate, fees, insurance, and any early-repayment penalty built into the product. The figure here isolates the core interest cost so you can compare like-for-like across deals — then add the other costs separately before signing anything.

What this doesn't capture

The figure excludes arrangement fees, valuation costs, legal fees, insurance, and any early-repayment charges — those can add several thousand to the headline cost. Rate changes at renewal for fixed-term deals will shift the picture further. Use this for the core interest/principal math and add the other costs on top.

Example Scenario

Broker fee comparison produces a winner based on the inputs provided.

Inputs

Loan Amount:300,000 £
Flat Fee Quote:1,000 £
Percentage Fee Quote:0.5
Expected Result£500.00

This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.

Sources & Methodology

Methodology

Direct comparison of both fee structures. Does not include any lender-paid proc fee which is separate.

Frequently Asked Questions

Do brokers always charge a fee?
No. Some are paid only by the lender via a procuration fee. Ask upfront — fees and who pays them vary widely.
Are broker fees negotiable?
Often yes, especially on larger loans. The percentage rate is where most negotiation happens.
Fee-free brokers — what's the catch?
They rely entirely on lender proc fees, which can bias them toward lenders who pay more. Ask how they are compensated.
Are broker fees tax-deductible?
Generally no for owner-occupiers. Buy-to-let landlords can deduct as a finance cost, subject to the relevant rules for their structure.

Related Calculators

More Mortgage Calculators

Explore Other Financial Tools