Helpful tools

We have a number of mortgage tools and calculators to illustrate and help you understand the options available to you.

If you are unsure about how to use any of the tools please view the full explanatory text on the relevant pages, or Contact us.

Rate rise calculator

Interest rates have been at an historically low level for a long period of time, leading to reduced payments for those on variable mortgage rates. But what could happen to payments if interest rates were to rise in the future?

If you would like to see how future interest rate rises could affect your monthly mortgage payments, then try our rate rise calculator. Simply enter a few basic details about your mortgage and we will show you what your payments could rise to should rates rise in the future.

Start the tool

Your current mortgage

Please enter a valid mortgage balance

What is your outstanding mortgage balance?

£ e.g.125000

What type of mortgage do you have?

Interest only Repayment

Please enter a valid Year/Month

How long do you have left on your mortgage?

e.g.15 Years

e.g.3 Months

Please enter a valid Interest Rate

What is your current interest rate?

e.g.2.5 %

See results

	Current rate	0.25%	0.50%	1.00%	2.00%	3.00%	5.00%
Your monthly payment will be*	0.00
An increase of	0.00

Results - How could interest rate rises affect your monthly payment?

If your mortgage
interest rate rises by...

0.25%

...then your monthly
payments could increase by

But if your mortgage
interest rate rises by...

2.00%

...then your monthly
payments could increase by

Your monthly payment (£)

            Change in interest rate (%)
            Your monthly payment (£)
            Color
            Increase of
        
            +0.00%
            208.00
            #01b6c7
            
            +0.25%
            229.00
            #1c1251
            
            +0.50%
            250.00
            #1c1251
            
            +1.00%
            291.67
            #1c1251
            
            +2.00%
            375.00
            #1c1251
            
            +3.00%
            458.33
            #1c1251

Change in interest rate (%)	Your monthly payment (£)	Color
+0.00%	208.00	#01b6c7
+0.25%	229.00	#1c1251
+0.50%	250.00	#1c1251
+1.00%	291.67	#1c1251
+2.00%	375.00	#1c1251
+3.00%	458.33	#1c1251

Edit details Next steps

Repayment Calculator

Switching to a repayment mortgage will increase your monthly payments, but the increase may be less than you might think. You also get the peace of mind that at the end of your mortgage term you will have paid your mortgage off in full.

This calculator illustrates the potential impact of switching from Interest Only to a Repayment mortgage.

The illustration assumes that your current interest rate remains stable throughout the remaining term of your mortgage. In reality, interest rates may rise or fall, so the actual amounts may be different to those quoted in the illustration.

The total amount payable does not include any fees and charges that may be applied upon mortgage redemption or during your term.

Start the tool

Your current mortgage

Please enter a valid mortgage balance

What is your outstanding mortgage balance?

£ e.g.125000

Please enter a valid Year/Month

How long do you have left on your mortgage?

e.g.15 Years

e.g.3 Months

Please enter a valid Interest Rate

What is your current interest rate?

e.g.2.5 %

Please enter a valid Switch Rate

How much of your interest only mortgage would you like to switch?

e.g.100 %

See results

Calculation results

	Interest Only	Repayment Mortgage
	Current term	Current term	Chosen term
Monthly Payment
Total interest amount payable over term
Balance owed at end of term
Total amount payable over term (Capital plus Interest)
Saving in total amount payable compared to Interest-only	n/a

Results - How much would you pay over your mortgage term of ?

	Total	Per month
Interest only Info – Monthly payments cover the interest but do not reduce the outstanding balance. Unless additional payments are made, your mortgage will not be repaid by the end of its term and you will then need to repay any outstanding balance as a lump sum.
Part & part (%) Info – A loan made up of Interest Only and Repayment parts. At the end of the term, the Repayment part should have been repaid in full, but the Interest Only part will need to be repaid as a lump sum.
Repayment mortgage Info – Monthly repayments should pay off both the capital amount borrowed as well as the interest, as long as you maintain your monthly payments. So by the end of the term your mortgage will have been repaid in full.

AMOUNT PAYABLE
(CAPITAL + INTEREST)

How much would you need to repay when your mortgage term ends in ?

	Payable
Interest only
Part & part (%)
Repayment mortgage

FINAL BALANCE
REPAYABLE FEB 2032

Edit details Next steps

Overpayment Calculator

Even small overpayments on your mortgage could make a big difference to the amount of interest you pay over the term of your mortgage. Our overpayment calculator provides an illustration of a mortgage with interest calculated monthly. The illustration is based on the assumption that your current interest rate remains stable throughout the remaining term of your mortgage.

In reality, since the interest rate may rise or fall, the actual effect of any overpayments on your mortgage may be different.

Also, depending on your mortgage, you may be liable to pay an Early Repayment Charge (ERC) if you make an overpayment. However, we are currently waiving all ERCs until further notice, so you won't have to pay this fee at present, even if it would usually have applied.

Start the tool

Your current mortgage

Please enter a valid mortgage balance between 1000 and 999999

What is your outstanding mortgage balance?

£ e.g.125000

What type of mortgage do you have?

Interest Only Repayment

Please enter a valid Year/Month. Maximum value is 40 years.

How long do you have left on your mortgage?

e.g.15 Years

e.g.3 Months

Please enter a valid Interest Rate

What is your current interest rate?

e.g.2.5 %

Please enter a valid overpayment value

How much do you want to overpay by each month?

e.g. 100

Please enter valid Value/Years

Do you want to make a lump sum payment?

Yes No

e.g.100

e.g.15 Years

See results

Results - See how much you could save by making overpayments

If you overpay by:

per month

you could save:

in interest

and your balance could be:

lower when your mortgage term ends in

	Monthly payment	Total amount repaid over term	Balance at end of term
With overpayments
Without overpayments

MORTGAGE BALANCE AT THE END OF YOUR MORTGAGE TERM IN MMMMMM YYYY (£)

To see the effect of overpaying by a different amount, Click the “Edit details” tab below.

Edit details Next steps

Results - See how much you could save by making overpayments

If you overpay by:

per month

you could save:

in interest

and you will pay off your mortgage:

	Monthly payment	Mortgage term	Total amount repaid
With overpayments
Without overpayments

To see the effect of overpaying by a different amount, Click the “Edit details” tab below.

Edit details Next steps

Use our calculators to work out your options

Understanding the Bank of England Base Rate change.

We've got all the information, support and guidance you need.

YOUR HOME MAY BE REPOSSESSED IF YOU DO NOT KEEP UP REPAYMENTS ON A MORTGAGE OR ANY OTHER DEBT SECURED ON IT.

*Calls may be recorded for monitoring and training purposes. Charges for calling 03 numbers are the same as for calls made to standard UK landline phone numbers starting 01 or 02 and are also included in bundled minutes and unlimited call packages.

Whistletree is a trading name of TSB Bank plc. TSB Bank plc. Registered Office: Henry Duncan House, 120 George Street, Edinburgh EH2 4LH. Registered in Scotland No. SC95237. Authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority under registration number 191240. TSB Bank plc is covered by the Financial Ombudsman Service.

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Please note – this link will take you through to a website operated by another organisation. Whistletree do not have any control over the content of external websites and can accept no responsibility or liability in respect of the material on such websites. Accept and Continue

Using this online form

Please ensure you complete all sections accurately to help us process your form as quickly as possible. We may not be able to process your request if the form is incomplete or contains errors.

You can find details of your account number and normal monthly payment date on your annual mortgage statement. We also include account numbers on most letters that we send to customers.

Request a payment holiday

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Helpful tools

Your current mortgage

Your current mortgage

Calculation results

Your current mortgage

Flexible options

Without overpayments

With overpayments

Time saved

Interest saved

Understanding the Bank of England Base Rate change.

We've got all the information, support and guidance you need.

Using this online form

Instalment
Total amount
Term

New instalment
New total
New term