I always have a dilemma with this, I don’t want to cut it too fine but also the earlier you renew the more months you ‘lose’. It seems worse with kids passports too because they are only 5 years to start with so it’s a bigger proportion.
DD’s passport expires early Sept ‘26. We are a family that travels a lot, usually to European destinations. So for that you need 3 months left on the passport - so wouldn’t be able to use her passport after early June ‘26 anyway. We will/might go away May half term - that would be ok, but cutting it fine with only 3 months and a couple of days left on the passport at our return. Then could send it straight off for renewal in early June with the plan that it’ll be back in plenty of time for August hols? That seems sensible doesn’t it? My instinct would be to renew MUCH earlier that that seems wasteful…