Five Common Mistakes When Saving for a House Deposit

Saving for a house deposit is one of the most rewarding things you can do with your money, and one of the easiest to get slightly wrong. The monthly transfer is the simple part. What catches people out is the steady drip of small decisions around it: which account the money sits in, what the bonus actually asks of you, and how much cash you need beyond the number written on the fridge. These five mistakes turn up again and again, and each one is fixable in an afternoon.

1. Assuming the Lifetime ISA has no strings

If you are a first-time buyer aged between 18 and 39, the Lifetime ISA is one of the most generous savings accounts available. The government adds 25% to what you pay in, up to a maximum of £1,000 a year on £4,000 of contributions. Free money, in effect — but wrapped in conditions that people often skim past.

• You must be between 18 and 39 to open one, and you can keep paying in until you turn 50.
• The account has to be open for at least 12 months before you can use it towards a home.
• It must be your first home, bought with a mortgage, and the property must cost £450,000 or less.
• Withdraw the money for anything else before you are 60 and a 25% government charge applies, which claws back the bonus and a slice of your own money with it.

Two practical points follow. If you hold a stocks and shares Lifetime ISA and expect to buy within a couple of years, moving the balance into cash as the purchase approaches stops a market wobble shrinking your deposit at the worst moment. And if the homes you are viewing cost more than £450,000, this is not the right account for that money, however tempting the bonus looks. Check the current rules on the government site before you commit, as they can change.

2. Saving in the wrong account

The default for many people is to let deposit savings pile up in a current account paying next to nothing. Over two or three years of saving, that quietly costs you a few hundred pounds.

Compare what is on offer: easy-access accounts, notice accounts, fixed-rate bonds, regular savers and cash ISAs. The difference between them is usually about access rather than risk. If your purchase is 18 months away, a notice account or a short fix may suit you; if you are still viewing properties, keep the money somewhere you can reach it quickly.

Tax is usually simpler than people fear. Basic rate taxpayers can earn up to £1,000 of interest a year tax-free, higher rate taxpayers £500, and additional rate taxpayers nothing — so most deposit savers stay inside their allowance. Splitting between a Lifetime ISA and an easy-access account is often the sensible answer.

3. Picking a deposit figure out of thin air

"Ten per cent" gets repeated so often that it starts to sound like a rule. It is not. What matters is the loan-to-value ratio a lender is pricing for, and a larger deposit usually opens up cheaper mortgage rates. But a bigger deposit is only better if you can still afford to live afterwards.

Work backwards instead. Decide the price range you are genuinely shopping in, check what deposit gets you a rate you can live with, then set the target. On a £250,000 home, 10% is £25,000 and 5% is £12,500 — neither is right by default.

Lenders also assess affordability on income, existing commitments and credit history, not deposit size alone. A large deposit will not rescue an application weakened by missed payments, so check your credit report early and correct anything that looks wrong. For decisions about mortgages, a regulated broker can tell you what lenders are likely to offer in your circumstances.

4. Underestimating the upfront buying costs

The deposit is only part of the money that leaves your account on the way to completion. The extras tend to arrive in a cluster, just when you are already stretched.

The deposit gets you the mortgage. The fees get you the keys.

• Solicitor or conveyancer fees, plus local authority searches and the Land Registry fee.
• A valuation fee for the lender, and separately a survey if you want to know more about the property's condition.
• Mortgage arrangement fees, which can sometimes be added to the loan but cost more that way.
• Stamp Duty Land Tax in England and Northern Ireland, LBTT in Scotland and LTT in Wales. First-time buyer relief exists, but thresholds and rules differ — ask your solicitor for a figure rather than guessing.
• The exchange deposit, typically 10% of the purchase price, paid when contracts are exchanged.
• Removals, buildings insurance, and the small things: new locks, a boiler service, curtains, a washing machine.
• For leasehold homes, service charges, ground rent and any fee for the licence to assign.

Ask your solicitor for a written estimate of total costs at the very start, then add a contingency of a few thousand pounds if you can. The first weeks in a new home have a habit of producing surprises.

5. Raiding the pot, or never automating it

A deposit that lives in your everyday account is a deposit on loan to your weekends. The fix is simple: a separate account, no card attached, and a standing order that leaves on payday rather than at the end of the month when there is nothing left to move.

Keep an emergency fund separate from the deposit. If the only money you have is earmarked for a house, one car repair or boiler failure can pull you back to square one. Three to six months of essential outgoings is the usual aim, but a smaller buffer is still better than none.

One thing not to do: pause your workplace pension to save faster. You would give up the employer contribution and the tax relief that comes with it, and it is rarely a good trade for an earlier move date.

A plan you can start this week

1. Write down your target: property price range, deposit percentage, and the total cash you need including fees and a buffer.
2. Open or review your Lifetime ISA, and check your purchase timeline and likely property price against the rules.
3. Set up a standing order for the day after payday, and split it between the deposit account and a separate emergency fund.
4. Ask a solicitor for a written costs estimate, and a broker for an agreement in principle so you know your borrowing range.
5. Diarise a six-monthly review to check rates, progress and whether your target still makes sense.

None of this requires perfect foresight, just a little admin done early. If your circumstances are unusual — self-employed income, a gifted deposit, a shared ownership scheme — take advice from a regulated mortgage broker or solicitor before you commit, because the details matter more than the general rules.

Photo: Khwanchai Phanthong / Pexels