
Hello and welcome back to Mortgage Advisor on FIRE. This week, I discuss investing versus overpaying a mortgage. Also, another nice walk, and more insanity from the White House.
Weekly Update
A stressful week, and I’m glad it’s over. I think a lot of stuff is catching up with me, and I’m starting to run out of spoons. I need some respite and a break from the routine, and thankfully, I’ve got something coming up in a short while; another cruise around Norway. I’ve got one of those countdown apps on my phone so I can watch the days tick down.
Does anyone enjoy their job? I’m sure some people do, but I’m guessing they’re very much a minority. I suspect many people tolerate their job as a means to an end. Then, there will be an unfortunate few who hate their job. For the most part, my new job is great, it’s just that initial bit where I’m still learning and, at times, feel like I’m groping in the dark. I just need to stick at it and I’ll get there.
Another question I’ve been asking myself is what my future mental health looks like. Anecdotally, lots of autistic people report a worsening of their symptoms as they age. Strictly speaking, my previous sentence isn’t really accurate. For general conversation, you could argue it’s directionally accurate, though.
Autism isn’t an illness or disease; it’s just different wiring and different software in the brain. It’s like 90% of the world runs on Windows, and then there’s the autistic minority running MacOS, and wondering why their machine is running slowly when installing stuff meant for Windows. So, autism doesn’t technically get worse, but lots of people feel as though it gets worse.
I suspect some of this is a weakening of mental resiliency, meaning autistic people can’t handle the same level of stress and anxiety they used to. After struggling for so long running incompatible software, the circuits start to overheat and degrade. I’m conscious of this, and it fuels my desire for FI, and it’s part of what is keeping me going now; I know my earning potential will never be higher than it is now.
Soy Estúpido
No, I’m not talking about Trump (yet). On Thursday, Oana went for a walk in the Peaks. I was working, so I couldn’t join her. I walked her into town to the bus station, and then said my goodbyes before walking into the city centre for a much-needed coffee. Starbucks was my destination, as it was the only thing open at 7:30 in the morning. I ordered my usual: a grande latte.
A short while later, I heard “grande latte” called, so I grabbed my drink and left. I made it twenty meters and one sip before realising this drink was disgusting. I checked the sticker, and it was a soy latte. I’d grabbed someone else’s drink by mistake. There was no name on the sticker, and just “guest” on the label.
I walked back in and the staff all looked at me before one asked if I was David. I confirmed my name and that I’m an idiot and left with the right drink. Seriously, soy lattes are disgusting. I can just about handle oat milk or almond milk, but soy? Nah, that stuff is rank.
This Week’s Walk
We got the train to Rotherham and had a bit of an explore around Boston Park, and a few other areas. We stopped at a cafe, Emporium of Stories, based in an old church. It’s great inside and the staff have done a fantastic job decorating and kitting it out. I ordered a bacon sandwich, and Oana went for a BLT. We like our bacon crispy, or as my Nan used to describe it, cremated. We had a good laugh with the staff about it and were expecting good things from the food.
My bacon sandwich cost £6.80, including a 30p charge for brown sauce. I was expecting maybe some nice crispy bacon on a sourdough roll or something. What I ended up with was two rashers of bacon on a bog-standard supermarket roll. To make matters worse, the brown sauce wasn’t even HP, it was Stokes (again, rank). There wasn’t anything wrong with the sandwich except the price. For context, a local sandwich chain called Beres, will do a great bacon sandwich for £4.55 that’s bigger and better. £6.80 was just a piss-take.

On our walk back to Sheffield, we like to go along the canal. This time, we were lucky enough to watch a barge go upriver and use some of the locks. I’ve always been fascinated by locks and how they work, but it’s been years since I’ve seen one used. For those who don’t know, locks are used on waterways where the water levels are uneven, and they allow boats to be raised or lowered from one section of the water to the next. The engineering is so simple and elegant, yet complex at the same time. It’s almost sorcery, and I love it.


Trump
It’s impressive how he manages to constantly outdo himself with something even more stupid than the last thing he did. This time, it’s referring to toy maker Mattel as a country. The guy isn’t fit for office. Look at the recent meeting with Canadian PM Mark Carney, where Trump claimed that the US and Canada don’t do much business. As the saying goes, you can have your own opinions, but you can’t have your own facts; Canada is one of the biggest trading partners the US has.
Sometimes I can’t resist throwing my opinions on Trump out there on social media, and the amount of hate I get for it is unreal. I don’t understand why anyone would vote for this idiot. The amount of mental gymnastics it must take to look at Trump and think, “yeah, he’s the guy to represent me” is insane. I just don’t get it.
Anyway, here are a few of my favourite Trump memes and posts from the past week…






What I’m Doing
Listening: Careless People by Sarah Wynn-Williams
Watching: The Punisher
We are rewatching The Punisher, which is one of the better Marvel shows. We both enjoyed Daredevil, and before watching the new series on Disney, we wanted to get caught up on all the related content.
Jon Bernthal is perfect as Frank Castle/The Punisher, and it’s one of those castings that just works. Sometimes you watch a film or show, and it’s obvious you’re just watching someone read lines from a script. Bernthal becomes The Punisher.
I was browsing Audible for my next listen, and Careless People caught my eye. I’m about a third of the way into it, and it’s the author’s story of their time working for Facebook. It’s decent so far, and the author does a good enough job narrating, although I don’t like the way she pronounces the word “data” as “dahtah”. It’s like nails on a chalkboard.
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DonateDonate monthlyDonate yearlyFinancial Update
Assets
Premium Bonds: £24,000.00.
Stocks and Shares ISA: £109,030.56.
Fuck It Fund: £4.00.
Pensions: £91,916.82.
Residential Property Value: £239,368.00.
Total Assets: £464,319.38.
Debts
Residential Mortgage: £184,205.56.
Total Debts: £184,205.56.
Total Wealth: £280,113.82.



I have now used up my ISA allowance for this year. Assuming a reasonable amount of growth, I’d be hoping for a balance of at least £115k by the time the next financial year starts.
I’m going to cash in £5k more of my Premium Bonds to make an overpayment on our mortgage. This will bring the loan-to-value under 75% for when we switch from my staff rate to a public one. I spoke with the bank on Friday and was told we could get 4.24% for five years. It’s still a little higher than I’d like, so I’m going to think about it a bit more. The bulk of our mortgage is on 4.45%, so it is a reduction. I’m just thinking that there might be a little more room for rates to drop before the end of the year.
Should You Overpay Your Mortgage or Invest Instead?
It’s one of the most common questions in personal finance circles, and one that has no universal answer: should you put spare cash into overpaying your mortgage, or are you better off investing it instead?
Having navigated this question myself, and after many conversations with friends, readers, and fellow FIRE enthusiasts, I’ve come to realise that while the maths matters, the psychology might matter even more.
Let’s break it down.
The Case for Overpaying Your Mortgage
Overpaying your mortgage offers a guaranteed, risk-free return equivalent to your interest rate. If you think of each unit of currency you own as a little worker earning you money, each unit of currency you owe is doing the reverse. So, if you pay off debt, you are sacrificing your workers to remove the ones working against you.
The benefits are clear. Overpayments reduce your balance and term, potentially shaving years off your mortgage. You’ll pay significantly less in interest over the life of the loan, and for many people, there’s genuine peace of mind in knowing their home is paid off. In the long run, being mortgage-free also gives you greater flexibility with your monthly expenses.
However, there are downsides to consider. The most obvious is the opportunity cost. If your mortgage rate is relatively low, say, between 2% and 4%, and investments could return 6% to 8% annually over the long term, you might be giving up substantial growth by choosing to overpay. There’s also the issue of liquidity. Once that money is used to reduce your mortgage, you can’t easily get it back. If your only significant asset is your home, you could end up being “house rich, cash poor.” Finally, in an inflationary environment, mortgage debt actually erodes in real terms over time, which means aggressively paying it down could mean losing out on that inflation benefit.
The Case for Investing Instead
On the other side of the coin, investing your surplus money offers the potential for higher long-term returns, especially when using tax-efficient vehicles like ISAs, SIPPs, or Lifetime ISAs.
Investing allows your money to grow more significantly over time. It offers greater flexibility, too, because you can usually access your funds if needed, particularly in ISAs. If you start early, you benefit from compounding growth, where your money earns returns on its returns year after year. It also helps you diversify your wealth beyond the property market, which can be important if your home is already your biggest asset.
But investing isn’t without its risks. Markets go up and down, and returns are never guaranteed. You need discipline to stay the course during downturns, and the temptation to sell or stop investing during volatile periods can derail your plans. There can also be tax implications, depending on the type of account and how much you invest. And while some people are comfortable with the ups and downs of the market, others may find it psychologically harder to cope with than steadily paying down a mortgage.
When Might Overpaying Make More Sense?
Overpaying is often the better choice if you have a high-interest mortgage, are nearing retirement, or if you place a high value on certainty over potential upside. It also suits people who are naturally more risk-averse or who simply feel better emotionally knowing they are reducing their debt.
When Might Investing Be the Better Option?
Investing may be the smarter move if you have a low, fixed mortgage rate and a long time horizon. If you’re already contributing to your pension or ISA, have a solid emergency fund in place, and are comfortable with the occasional market dip, investing gives your money more room to grow. It’s particularly effective for those working toward financial independence who want to build a diverse portfolio of income-generating assets.
What About Doing Both?
The truth is, this doesn’t have to be an either/or decision. A blended approach can offer the best of both worlds. You might decide to overpay your mortgage modestly each month, perhaps £100 or £200, while also putting money into a global index fund through a Stocks & Shares ISA. This way, you reduce your debt while still giving yourself the opportunity for long-term growth.
Over time, you can review your priorities and adjust the balance between overpaying and investing. Life circumstances change, markets shift, and so do our goals.
Money is about more than numbers. It’s about security, freedom, and what makes you feel in control. While spreadsheets might tell you investing wins over time, the certainty of a paid-off home is hard to beat for some.
I often say: “Optimise for sleep as well as returns.”
So ask yourself: What’s your time horizon? How do you handle risk? Do you want flexibility now, or freedom later?
Both paths can lead to financial independence. The right one is the one that gets you there with confidence.
As always, the decision and responsibility are your own. If you don’t feel confident or qualified to make a decision, seek impartial advice from a qualified professional.
DISCLAIMER
The views and opinions in this blog are my own, and do not represent the views or opinions of my former, current, or future employers, nor should they be considered advice.
If you want personalised financial advice, seek an appropriate professional. If you are in financial difficulty, seek advice via the resources below:
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