01273 761220
October 29, 2026
Henry and Joanna Need a Bigger House
When the family outgrows the home, and the sums are not as simple as they look
The conversation had been bubbling away over dinner for months.
Emma is at school now, and Jack is not far behind. The three-bedroom house in Horsham that once felt like a real step up has quietly filled to the edges. Shoes in the hallway, a trampoline taking up most of the garden, nowhere for anyone to work from home without sitting on a bed. Nothing is wrong with the house. There is simply less of it than there used to be.
And so Henry and Joanna have started looking.
The House They Have Found
It is a four, nearly five-bedroom family home a little further out, with a proper garden, a study, and crucially a place in the catchment for the school they would like for both children. It is the kind of house you can imagine a childhood happening in. They have both quietly fallen for it.
It is also, at around one and a quarter million pounds, a significant step up from where they are now.
On Henry’s income, as a newly appointed Chief Actuary, it is within reach. But “within reach” and “simple” are not the same thing, and this is where a good adviser earns their keep, because the way Henry funds this matters a great deal more than he first assumed.
The Costs People Forget
The headline is the purchase price. The reality is everything around it.
Stamp duty on a house at this level runs to tens of thousands of pounds, a cost that surprises people every time with its size, and one that has to be found in cash on completion. Then there are the moving costs, the solicitor, the survey, and the long tail of a bigger house: higher running costs, more to heat, more to maintain, more garden to tame.
And then there is the mortgage itself. Henry and Joanna have not borrowed seriously in years, and the world has changed since they last did. Mortgage rates are meaningfully higher than the near-free money of the previous decade. Whether they choose repayment or interest-only, the monthly cost of borrowing at today’s rates is a real number, and it lands every month for years. Even on a strong income, cash flow matters. The question is not only “can we buy this house,” but “what does life feel like, month to month, once we have.”
Where the Deposit Comes From
Here is where it gets interesting, and where a conversation Henry had at work turned out to be unexpectedly valuable.
Henry and Joanna have built up sizeable ISAs over the years, holding a meaningful amount between them. The obvious move is simply to pull the money out to boost the deposit. Henry is too young to touch his pension, and the ISA is the largest pot readily available, so on the face of it the ISA is the answer.
Not long before, a colleague of Henry’s had done exactly that. He had dipped into his ISA to cover a short-term need, fully intending to put the money straight back a few weeks later. When he came to repay it, he had an unpleasant surprise: his ISA would not let him. Once the money was out, it was out, and he could only pay back up to his annual allowance. Years of tax-free saving, lost from the wrapper for the sake of a temporary withdrawal.
It made Henry pause. He and Joanna had spent years filling those ISAs, a little at a time. He did not want to make the same mistake, losing the tax-free shelter permanently just to bridge a few months until his bonus arrived.
So before touching anything, he checked. And it turned out his ISA had a feature his colleague’s did not.
The Detail That Changes Everything
Not all ISAs are the same. Some are what is called flexible.
A flexible ISA lets you withdraw money and pay it back within the same tax year without the repayment counting against your annual allowance. So if Henry takes, say, two hundred thousand pounds out of his ISAs to help fund the purchase, and replaces it from his bonus before the end of the same tax year, the full amount can go back in. The tax-free wrapper is preserved. He has effectively used his ISA as a short-term bridge, then rebuilt it.
His colleague’s ISA did not have this feature, which is why his withdrawal could not be undone. And that is the catch most people never think about until the moment it matters: the flexible version and the non-flexible version look identical right up until the day you try to put the money back.
There is one condition that matters more than any other, and it is all about timing. The withdrawal and the repayment must fall within the same tax year. The tax year ends on 5 April, and the flexibility does not carry across it. Take the money out in one tax year, miss the deadline, and try to repay in the next, and the opportunity has gone. For Henry, that means lining up the withdrawal, the purchase and the arrival of the bonus with the calendar firmly in view.
It is a small piece of planning with a large consequence. And it is worth checking whether your own ISA is flexible well before you ever need it to be, because by the time you do need it, as Henry’s colleague found, it is too late to change.
The Bigger Picture
Step back, and the house move is really a cash flow story dressed up as a property decision.
Henry is fortunate, and his income is high. But fortune does not remove the need for planning; it changes its shape. The questions are the same ones any family faces, just with more noughts on the end. How much to borrow and how much to fund from savings. How to keep the tax-free wrapper intact rather than carelessly giving it up. How to make sure the bonus that repays the ISA actually arrives in time. What the monthly cost feels like once the excitement of the move has faded. And how all of this fits with the pension, the children’s futures, and the life they are trying to build.
None of it is difficult, exactly. But it benefits enormously from being thought through in the right order, with the whole picture in view, rather than decided in a rush on the day an offer is accepted.
Henry and Joanna will get their bigger house. The garden, the study, the school place, the childhood they can picture. And because they paused to plan the funding properly rather than simply pulling the obvious lever, they will get there without quietly throwing away years of careful saving in the process.
Sometimes the value is not in the big decision. It is in the small detail that everyone else misses.
Coming Next in The Life of Henry
Next time, we return to Brian and Carol, and one of the most satisfying forms of planning there is: giving to a cause the family cares about, in a way that also eases the inheritance tax bill.
Henry’s story continues.
Henry, Joanna, Emma and Jack are fictional characters. The themes explored in this series are drawn from many years of client conversations and observations across the financial planning profession, but no individual client is depicted and no real names are used.
This article is for information purposes only and should not be construed as tax or financial advice. Individual circumstances vary and tax legislation may change. For personalised advice, please speak to a regulated financial planner.