Paying your mortgage product fee upfront keeps the loan smaller and avoids interest on the charge. Adding it to the loan protects your cash at completion but costs more over time. On a £250,000 mortgage at 4.29%, adding a £999 fee costs £631.31 extra across a 25 year term.
A mortgage product fee is one of the few costs in a house purchase that you get a real choice about. Pay the mortgage product fee separately in cash, or add it to the loan and let it sit inside your balance for the rest of the term.
Neither route is free, and the difference is rarely explained at the time. Lenders present it as a tick box on the application, usually at the exact point when your deposit, your stamp duty and your legal costs have already drained your account.
Tick the wrong box and you pay interest for years on a charge you could have cleared once.
This guide covers what the fee pays for, when it becomes payable, and what each route costs in pounds on worked figures, so you can see the arithmetic before you commit to either.
A mortgage product fee is the charge a lender applies for one specific deal, rather than for the mortgage itself. It sits alongside the interest rate as part of the price of that product, and it is set per deal rather than per borrower.
The same lender will often list two versions of the same five year fix. One carries a lower rate and a fee. The other carries a higher rate and no fee at all. Both are the same loan against the same property, priced two different ways.
Lenders describe the charge as covering the administration of setting up and reserving your chosen deal. In practice its function is pricing. A lender that wants an attractive headline rate can hold the rate down and recover the margin through a fixed cash charge instead.
That matters for how you compare deals. A rate on its own tells you very little until you know what the mortgage product fee attached to it is and how long you intend to keep the deal.
Lenders do not agree on what to call it. You will see product fee, arrangement fee, booking fee, completion fee and application fee used across the market, and in most cases they refer to the same charge.
Skipton Building Society, for example, calls it a completion fee in its published Tariff of Mortgage Charges, and states that completion fees “can be paid in advance prior to Offer or can be debited to your mortgage account if you choose”. Naming varies by lender, so read the tariff rather than the label.
Some lenders split the charge in two, taking a small non refundable booking fee at application and the balance at completion. Our guide to what mortgage product fees are covers the definitions in more detail.
You will find the amount stated on the illustration your lender has to give you before you apply. Under the FCA’s rules in MCOB 5, that illustration must set out the charges, must show whether fees are added to the loan, and must show the total cost of the contract over its term.
Read section by section rather than glancing at the rate. The illustration is the one document that puts the rate, the mortgage product fee and the total payable in the same place.
Every regulated mortgage illustration carries an APRC, the annual percentage rate of charge. It expresses the whole cost of the mortgage as a single yearly percentage, and the fees you are obliged to pay are built into it.
That makes the APRC useful as a sanity check and unreliable as a decision tool. It assumes you keep the mortgage for its entire term on the same product, which almost nobody does.
A deal with a low initial rate, a large mortgage product fee and a high follow on rate can show a flattering APRC purely because the expensive years are 20 years away.
Use it to confirm that a fee exists and roughly what weight it carries. For the decision that actually faces you, which is the cost over the two, three or five years you will hold the deal, the monthly payment and the fee together tell you more than the APRC does.
Timing is where most confusion sits, because the answer depends on the lender and on the choice you make at application. Getting it wrong leaves you short of cash at the point you can least afford to be.
Most lenders take the mortgage product fee at completion, which means it comes out of the transaction rather than out of your pocket weeks earlier. Some take part of it at application as a booking fee.
Where a fee is taken at application, it is often non refundable even if the mortgage does not go ahead. Where it is taken at completion, you have the option of paying it in cash or adding it to the loan.
A fee taken at completion is not charged if there is no completion, so a sale that collapses before exchange usually leaves that charge unpaid. A booking fee taken at application usually stays with the lender.
Valuation fees follow the same logic. Once the valuer has been instructed, the work has been done, and the money is gone whatever happens to the purchase afterwards.
The mortgage product fee shows up three times: on the illustration before you apply, on the mortgage offer, and on the completion statement your solicitor prepares. All three should agree.
Check the offer against the illustration before you sign anything. If the fee has moved, or if it has been added to the loan when you asked to pay it separately, that is far easier to correct at offer stage than after completion.
Paying the fee separately keeps your loan at the figure you applied for. Nothing is added, so nothing accrues interest, and the charge stays the one off cash cost it appears to be.
Take a £250,000 repayment mortgage over 25 years on a five year fix at 4.29%, with a £999 mortgage product fee. These rates are illustrative figures chosen to show the arithmetic. They are not quotes and they are not an indication of what is available to you.
Pay the fee separately and you borrow £250,000. The monthly payment is £1,359.95. Over the five year fix you pay £81,597.04 in monthly payments plus the £999 in cash, so £82,596.04 leaves your account, and the balance outstanding at the end of the fix is £218,863.24.
Completion is the point in a purchase where cash is tightest. Deposit, stamp duty, legal costs and searches all land within a few weeks of each other, and a four figure fee on top of that can be the difference between a comfortable move and an uncomfortable one.
That is a practical constraint rather than a financial one, and it is the reason plenty of borrowers add the fee even when they can see it costs more. Working out your total cash requirement early, with our mortgage repayment calculator alongside the illustration, tends to answer the question faster than any general rule.
The mortgage product fee is one line among several. A valuation fee may apply depending on the lender and the deal. Conveyancing costs, searches and Land Registry fees are separate again, and stamp duty land tax sits on top for most purchases.
Broker fees are the line you can remove. We charge no fee for advice or arrangement, because we are paid commission by the lender when a mortgage or remortgage completes, and we are not tied to any single lender or institution. Our free mortgage advice page sets out how that works.
Adding the fee moves it from your bank account into your mortgage balance. The cash pressure at completion disappears. In exchange, the charge stops being a one off and starts behaving like borrowing.
Add the same £999 to the same £250,000 loan and you borrow £250,999 instead. The monthly payment rises from £1,359.95 to £1,365.39, a difference of £5.43 a month.
Five pounds a month sounds like nothing, and over a single fix it very nearly is. Held for the full 25 years at that rate, though, the added fee costs £631.31 more in interest than paying it in cash would have done. The charge is now borrowed money, repaid on the same terms as the rest of the loan.
Adding the fee raises the amount you are borrowing against the same property, which raises your loan to value. Most of the time the movement is too small to matter. Occasionally it is not.
If you are borrowing right at the edge of a lender’s threshold, at 90% or 75% for instance, an extra £999 can push you into the next band and onto a higher rate across the whole loan. That is the one scenario where adding the fee can cost far more than the interest on it.
Check where you sit with our loan to value calculator before you decide.
There is a middle route that borrowers often miss. Add the mortgage product fee at completion so the cash pressure disappears, then overpay by the amount of the fee once the move has settled and your finances have recovered.
Most fixed rate deals allow overpayments of up to 10% of the balance each year without a charge, though the allowance is set by the lender and stated in your offer. An overpayment of £999 in the first year removes almost all of the £631.31 of extra interest, because the interest had barely begun to accrue.
The effect is that you get the cash flow benefit of adding the fee and very nearly the cost of paying it upfront. Read your early repayment charge terms first, since overpayment allowances vary and exceeding one triggers a charge.
Here are both routes side by side, using the same illustrative mortgage from the section above. Nothing changes between the two columns except how the mortgage product fee is handled.
The figures assume a £250,000 repayment mortgage over a 25 year term, a five year fixed rate of 4.29%, a £999 mortgage product fee, and no overpayments.
Bank Rate stood at 3.75% as at 30 July 2026, with the next Monetary Policy Committee decision due on 17 September 2026, according to the Bank of England. The rate used below is illustrative and is not a market average.
| Fee paid upfront | Fee added to the loan | |
|---|---|---|
| Amount borrowed | £250,000 | £250,999 |
| Monthly payment | £1,359.95 | £1,365.39 |
| Cash needed at completion | £999 | £0 |
| Paid over the five year fix | £82,596.04 | £81,923.11 |
| Balance owed after five years | £218,863.24 | £219,737.82 |
| Extra interest over a full 25 years | £0 | £631.31 |
Over the five year fix, adding the fee leaves £672.93 more in your account, because you never paid the £999 and the higher monthly payment only claws back part of it. You also owe £874.58 more at the end of the fix.
So the choice over one fix is closer to a swap than a saving: keep £999 now, owe roughly £875 more in five years. Which side of that you prefer depends on what the £999 is doing in the meantime, and on whether you have it to spare at all.
The bigger decision is usually not how to pay the fee. It is which of two priced versions of the same product costs less across the period you actually hold it.
Compare two illustrative five year fixes on a £250,000 repayment mortgage over 25 years. Deal A is 4.09% with a £1,499 mortgage product fee. Deal B is 4.39% with no fee. Again, both sets of figures are illustrative rather than quotes.
Deal A costs £1,332.05 a month. Deal B costs £1,374.02. The lower rate saves £41.97 a month, or £2,518.27 over the fix, which leaves you £1,019.27 ahead after the £1,499 fee. You also owe £1,130.86 less at the end of the five years, because more of each payment went to capital.
Run the identical pair on a £120,000 loan and the answer reverses. The 0.30% rate difference is now worth only £20.15 a month, or £1,208.77 across the fix, against the same flat £1,499 fee.
| £250,000 loan | £120,000 loan | |
|---|---|---|
| Monthly saving from the lower rate | £41.97 | £20.15 |
| Saved over the five year fix | £2,518.27 | £1,208.77 |
| Product fee on the lower rate deal | £1,499 | £1,499 |
| Net position after five years | £1,019.27 better off | £290.23 worse off |
| Better route on these figures | Lower rate with fee | Fee-free deal |
Length of deal matters as much as size of loan, because the fee is a flat cost and the saving accrues monthly.
Hold the same pair of deals on the same £250,000 loan for two years instead of five and the £41.97 monthly saving is worth £1,007.28 in total, against a £1,499 fee. You end £491.72 worse off on the lower rate.
On a two year hold at that loan size, any mortgage product fee above roughly £1,007 loses money. The identical fee on the identical loan over five years wins by more than a thousand pounds. Nothing about the deals changed except how long you kept them.
Work out the cost over the period you intend to hold the deal, not over the term of the mortgage. A borrower expecting to move within three years, or expecting income to change enough to want a different product, is in a different position from one settling in for a decade.
On this pair of rates and this fee, the two routes break even at a loan of roughly £148,800. Below that the fee-free deal wins. Above it the lower rate wins, and the gap widens as the loan grows.
The crossover moves every time the rate gap or the fee changes, so it is arithmetic rather than a rule. Two things push the answer towards the fee-free deal: a small loan, and a short period before you expect to move or remortgage.
A fee paid for five years of savings and then abandoned after two has only delivered two years of savings.
It depends when it was taken. A fee charged at completion is generally not charged at all if the mortgage never completes. A booking fee taken at application is commonly non refundable, even when the purchase collapses through no fault of yours. Your lender’s tariff of charges states which applies, and it is worth reading before you submit anything.
Yes, for as long as the balance including that fee is outstanding. Adding a fee and then remortgaging after two years means you paid interest on it for two years, and the unpaid remainder simply carries into whatever you redeem the mortgage with. Repeat that at every deal, and added fees quietly accumulate inside the balance.
No. A fee-free deal removes a known cash cost, which is worth something on its own, but it usually comes with a higher rate. On larger loans the rate difference often outweighs the fee comfortably, as the comparison above shows.
The size of your loan and the length of the deal decide it, not the presence or absence of a fee.
No. It is separate from both. Your deposit reduces the amount you borrow, stamp duty land tax is payable to HMRC on the purchase price, and the mortgage product fee is a charge from the lender for the deal itself. All three are budgeted separately, and your mortgage in principle will not include the fee.
The decision comes down to arithmetic on your own numbers rather than a general rule:
Run your own figures, then talk them through with someone who can see the whole market. We charge you nothing for advice or arrangement, because lenders pay us commission when a mortgage completes, and we are not tied to any lender. Book a free appointment with our mortgage team and we will price both routes on your actual mortgage.
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