As first replier said, try it in chatgpt. I put it in and this is what it said.
You’re not missing anything obvious — you’re already thinking about the right trade-offs. The decision here isn’t just “which interest rate is lower”, it’s about cash flow, risk, flexibility, and family exposure. Let’s walk it through calmly.
First, let’s restate the two options cleanly
🏠 Purchase
- Home Report value: £160k
- Likely purchase price: £170k
- Family contribution: £10k (gifted from parents)
Mortgage 1 – 95% LTV (with £8k deposit)
- Deposit from your son: £8k
- Mortgage: £152k
- Interest rate: 4.79%
- Fixed for: 2 years
- Loan size is lower from day one
Pros
- Lower interest rate
- Lower monthly repayments
- Smaller mortgage balance → less interest overall
- More equity immediately
Cons
- Completely wipes out his savings
- Only fixed for 2 years → remortgage risk fairly soon
- Less financial buffer if something goes wrong
Mortgage 2 – Barclays Family Springboard
- Deposit from son: £0
- Mortgage: £160k
- Interest rate: 5.29%
- Fixed for: 5 years
- You place £16k in Barclays savings for 5 years
Pros
- Son keeps his £8k savings as an emergency fund
- Longer 5-year fix = stability and certainty
- No risk of needing cash for repairs, moving costs, life events
- After 5 years, your £16k is released (assuming no arrears)
Cons
- Higher interest rate
- Larger mortgage balance throughout
- You are tying up £16k for 5 years (even if the savings rate is decent)
About your £4k “extra interest” calculation
Your instinct is basically correct, but there are two important nuances.
1️⃣ Yes — higher rate + higher balance = more interest
Over 5 years, Mortgage 2 will cost several thousand pounds more in interest than Mortgage 1. Your £4k estimate is in the right ballpark.
2️⃣ BUT the £8k deposit has an
opportunity cost
If your son:
- Keeps his £8k
- Invests it modestly or even just holds it as cash
- Avoids borrowing short-term money later (credit cards, overdraft, family help)
That £8k has real value beyond “interest maths”.
Also important:
- A wiped-out savings account is risky, especially for a first flat
- First-year ownership costs always surprise people (furnishings, repairs, service charges)
The key question isn’t interest — it’s
risk tolerance
Here’s the heart of it:
Mortgage 1 is
financially cheaper
…but financially tighter.
Mortgage 2 is
financially more expensive
…but emotionally and practically safer.
For a first-time buyer, especially a young one, that safety is not trivial.
About your £16k Barclays savings deposit
This is actually a strong point, not a weakness:
- The money is still yours
- It earns interest
- It’s not spent, just locked
- The risk is limited to your son defaulting (which you presumably judge unlikely)
Compare that with:
- £8k of your son’s savings being permanently gone on day one
One more thing people often overlook
After 5 years on Mortgage 2:
- He should have a solid repayment history
- His LTV will be lower
- He can remortgage to a much better rate
- Your £16k comes back
Mortgage 1 forces a remortgage after 2 years, possibly in a worse rate environment.
My balanced take (not advice, just perspective)
If this were purely numbers, Mortgage 1 wins.
If this were my child buying their first flat, I’d seriously lean toward Mortgage 2, because:
- Empty savings + homeownership = stress
- Life happens
- Stability for 5 years is hugely valuable
- Your £16k isn’t lost, just parked
You’re not being financially naïve at all — you’re weighing security vs efficiency, which is exactly what good decisions look like.
If you want, I can:
- Roughly model monthly payments side-by-side
- Talk through “what happens if he sells in 3–5 years”
- Help you sanity-check whether £170k is stretching him too far
Just say the word
hope that helps!