Overpay the Mortgage or Max the Pension? The £600k Decision

£500 a month has just freed up. Do you kill the mortgage — or supercharge the pension?When childcare costs drop, most households would love the problem Chris is facing: a few hundred pounds a month to redirect, and one big decision to make. Overpay the mortgage and be debt-free years early, or pour it into the pension and let compounding do the work?So Ed and Chris ran the real numbers on Chris's own finances — a £453k mortgage on a 29-year term, 27 years to retirement — and modelled both paths. The gap is bigger than you'd think: roughly £750k in the pension one way, around £1.3m the other. But as they get into tax relief, the spread between market returns and mortgage rates, what each route means for retirement income, and a smart way to clear the mortgage with tax-free cash, it becomes clear the spreadsheet answer isn't always the one you'd choose.In this episode:- How £500 a month becomes a six-figure difference over 27 years- Why a guaranteed 4.5% saved isn't the same as a hoped-for 7% earned- Where both options land against the "comfortable retirement" benchmark- Using your 25% tax-free lump sum to clear the mortgage — and the trap of doing it the wrong way- Why pensions and property are now taxed very differently when you pass them onTeam mortgage or team pension? We'd love to hear how you'd play it.We don't give financial advice — we're talking through our own situations. Everything here rests on assumptions that will change, so if you're weighing this up yourself, speak to an FCA-regulated financial adviser.(0:00) The £500 question(1:39) Chris's 29-year mortgage problem(2:27) The reveal: £750k vs £1.3m(4:42) Why the real number could be higher(6:54) Shorting inflation & the 2.5% spread(8:48) Clearing the mortgage a decade early(9:30) What it means in retirement(11:09) Finishing the mortgage with tax-free cash(12:18) The inheritance tax trap: home vs pension(15:27) A two-pronged plan(17:39) The discipline problem(18:51) Inflation, rates & staying ahead(20:51) So, what did Chris decide?The Mouthy Money podcast — how we actually think about pensions, ISAs, mortgages, tax and the economy. New episodes every week.🔔 Subscribe: https://www.youtube.com/@mouthymoneypodcast📰 Mouthy Money News (short explainers, twice a week): https://www.youtube.com/@MouthyMoneyNews📲 TikTok: https://www.tiktok.com/@mouthy.money📸 Instagram: https://www.instagram.com/mouthymoney/✍️ Substack: https://mouthymoney.substack.com/📩 Get in touch: [email protected] anywhere:Spotify: https://open.spotify.com/show/72bQEJnPAWJprmy0B9Yy4uApple: https://podcasts.apple.com/gb/podcast/mouthy-money/id1712308475Full disclaimer: Produced for general information only. Not investment, legal, tax, mortgage or other financial advice. If in doubt, consult a regulated professional about your own situation. Past performance is no guarantee of future results. Investments can fall as well as rise and you may get back less than you put in. Never invest more than you can afford to lose. More at https://www.fca.org.uk/investsmart. Captions are auto-generated and may not be fully accurate.