To save a mortgage deposit faster, fix a specific target, work out the monthly amount that reaches it by your chosen date, automate that transfer on payday and keep the money somewhere that pays interest. For a £280,000 home, a 10% deposit is £28,000. Starting with £2,000 and saving £400 a month at 4% takes about 4 years 11 months, while £600 a month cuts it to around 3 years 5 months.
Note: this is general information, not financial advice. The calculations are estimates that assume a steady interest rate and no withdrawals. Rates, account rules and government schemes change, so check the provider and GOV.UK before you rely on any of them.
Start with a target, not a feeling
“I need to save for a house” is hard to act on. “I need £28,000 by October 2030” is a plan. The target has three parts: the price range you can realistically afford, the deposit percentage you are aiming for, and the extra cash for fees.
Deposit percentages shape both your options and your monthly payment. As a rough illustration, on a £280,000 home:
| Deposit | Amount | Loan |
|---|---|---|
| 5% | £14,000 | £266,000 |
| 10% | £28,000 | £252,000 |
| 15% | £42,000 | £238,000 |
| 20% | £56,000 | £224,000 |
Lenders generally offer a wider choice of deals, and often lower rates, as your deposit share rises. But waiting to save a large deposit has a cost too, because prices and rents move while you wait. It is a trade-off, not a rule. A useful approach is to set two targets: a minimum you could buy with, and a stretch target that would give you a stronger position.
Do not forget the cash outside the deposit. First-time buyer costs: the full checklist lists the legal, survey, mortgage and moving costs that sit on top, and these need their own savings line. A deposit pot that is exactly the deposit leaves you short on completion day.
Work out the monthly amount
Once you have a target and a date, the maths is simple. There are two questions to ask, and both can be answered with a savings calculator:
- If I save this much each month, how long will it take?
- If I need it by a certain date, how much must I save each month?
Using the House of Calculator savings engine with a £28,000 goal, £2,000 already saved and 4% interest:
| Monthly saving | Time to reach £28,000 | You pay in | Interest earned |
|---|---|---|---|
| £300 | 6 years 3 months | £24,500 | £3,511 |
| £400 | 4 years 11 months | £25,600 | £2,812 |
| £600 | 3 years 5 months | £26,600 | £1,968 |
The other way round, to reach £28,000 by a fixed date from the same £2,000 start at 4%:
| Deadline | Needed each month | You pay in | Interest earned |
|---|---|---|---|
| 2 years | £1,037 | £26,877 | £1,123 |
| 3 years | £675 | £26,305 | £1,695 |
| 5 years | £386 | £25,180 | £2,820 |
Look at how the interest scales. Over two years it is only about £1,100, but over five years it is about £2,800. Interest helps, but your contributions do most of the work, especially on a short timeline. If the interest rate were 0%, £400 a month would take 5 years 5 months instead of 4 years 11 months, so a decent rate on the account is worth about six months in this example. These figures assume monthly deposits and a constant rate, which real accounts rarely maintain. See How long to reach a savings goal for the method in more detail.
Find the money: a budget that creates a surplus
The calculator tells you what you need, but you still have to find it. Start from your take-home pay, not your gross salary, and list your fixed costs, your variable spending and what is left. Our How to work out your take-home pay from a UK salary guide shows how to get from salary to net pay.
A simple method is to look at three months of bank statements and sort spending into groups: housing, bills, food, transport, subscriptions, leisure and everything else. Most people find a few areas that matter less to them than the money they spend on them. The typical suspects are:
- Subscriptions you no longer use, or that you could rotate rather than hold all at once.
- Takeaway and delivery spending, which tends to be higher than people expect.
- Insurance, broadband and mobile contracts at the end of a fixed term, where switching can save money.
- Bank charges and interest on overdrafts or credit cards, which cost you more than your savings earn.
Aim for changes you can keep up for years. A cut so severe that you abandon it after three months saves less than a modest one you maintain. If you have debts charging a high rate, clearing them often beats saving, because a credit card charging far more than a savings account earns loses you money on every pound owed. A lender will also look at your debt payments when deciding how much to lend, which is why paying off a loan before applying can raise the amount you can borrow.
Pay yourself first and automate it
The most reliable habit is a standing order that moves money on payday. If you wait to see what is left at the end of the month, it is usually nothing. Set the transfer for the day after your salary arrives, into an account that is separate from the one you spend from, and treat it as a bill.
A few tactics make the habit stick:
- Name the account. A pot called “House deposit” is harder to raid than “Savings”.
- Raise the transfer with every pay rise. If your take-home rises by £100 a month, send half to the deposit pot before your spending adjusts.
- Add windfalls. A bonus, tax refund or birthday money can shorten the timeline noticeably. £2,000 added at the start is the same as 5 months of £400.
- Check once a quarter. Compare your balance with the plan and adjust, rather than checking every week.
If you are a couple, decide how you will each contribute. An equal split may be fair on paper, but a proportional split, where each puts in the same share of their take-home pay, is often more realistic when incomes differ. Agree this early, and agree what happens to the money if you separate before buying.
Choose where to keep the deposit
The right account depends on how soon you expect to buy. The main options in the UK are:
- Easy-access savings accounts: you can withdraw at any time, and the rate can change. Good for the part of the pot you might need soon.
- Fixed-rate savings or bonds: a set rate for a set period, with limited or no access. Good if you know you will not need the money before the end.
- Cash ISAs: interest is free of tax within your yearly allowance. Check the current annual limit on GOV.UK.
- Lifetime ISA: designed for a first home or later life, with a government bonus. See the next section.
- Stocks and shares investments: these can rise and fall. For a deposit you need within a few years, losing a chunk just before you buy is a serious risk, so many people keep a house deposit in cash.
Interest on cash savings may be taxable above the personal savings allowance (£1,000 for basic-rate taxpayers and £500 for higher-rate taxpayers), with a starting rate for savings that can make some of your interest tax-free as well. For most people saving a deposit this is not an issue, but a larger pot at a high rate can reach it, and an ISA avoids the question altogether. Check the rules on GOV.UK.
Make sure any provider you use is covered by the Financial Services Compensation Scheme, and check the limit for the type of account and the bank group you use. A deposit pot above the protected limit with a single provider is a risk worth spreading.
The Lifetime ISA and other help for first-time buyers
The Lifetime ISA (LISA) is available to adults aged 18 to 39 and pays a government bonus of 25% on contributions, up to £4,000 a year, so the maximum bonus is £1,000 a year. The LISA counts towards the overall ISA allowance. You can use the money towards a first home, subject to conditions, including that the property costs no more than a set cap (currently £450,000 as far as we know, so check GOV.UK) and that the account has been open for at least 12 months. Withdrawing for any other reason before age 60 usually involves a withdrawal charge that can leave you with less than you put in.
A worked-by-hand example: saving £333 a month into a LISA for three years puts in about £12,000 and, with the bonus, adds about £3,000, a total of about £15,000 before any interest. That bonus is equivalent to a 25% return on the contributions, which is far above what any ordinary savings account pays. The rule on the time the account has been open means opening it early matters, even with a small first payment, because a clock starts when you first pay in. Because LISA rules are strict and have changed before, check the current conditions, cap and charges on GOV.UK before you commit.
Other forms of support exist: shared ownership, government-backed mortgage guarantee schemes and family help. A gift from a relative can be used toward a deposit, but lenders and solicitors will ask for a gift letter and evidence that it is not a loan. Each of these has conditions and different long-term costs. If you are considering one, speak to a regulated adviser or mortgage broker.
Check what you can borrow while you save
Saving the deposit is half the equation. Your income decides how much you can borrow, so test the whole picture early. With the House of Calculator affordability tool, two applicants each earning £32,000 with no other debts, a £28,000 deposit, 4.5 times income and a 25-year term at 4.5% could borrow about £288,000, which with the deposit would suggest a home around £316,000. Single-income buyers on lower pay will see a lower figure. The same tool shows that a deposit of 8.9% of a price is on the edge of what many lenders accept.
Lenders test more than the multiple: your outgoings, your credit record and whether you could manage if rates rose. So use the figure as a guide. Our How much mortgage can you afford? guide explains how lenders arrive at their number. The practical point is that a bigger deposit does not matter if the loan you can get is too small to buy in the area you want, and a big loan is no use if the payment would stretch your budget. Run both calculations before you set the target.
Common mistakes when saving for a deposit
- Setting no date. A target without a deadline never creates urgency.
- Keeping the deposit in a current account. It earns little and is easy to spend.
- Chasing a high-risk return. Money needed within a few years should not depend on the stock market.
- Ignoring the other costs. A deposit with nothing left for fees is not enough.
- Letting expensive debt run. Paying off a credit card at a high rate is usually worth more than the interest you would earn.
- Assuming a rate will last. Savings rates change. Review the account every year, and move the money if the rate falls.
- Missing the free money. Check whether a LISA, an employer scheme or a family gift could add to your pot.
Try the calculator
Put your own target, starting balance and interest rate into the Savings Goal Calculator to see the time or the monthly amount, then test your borrowing with the Mortgage Affordability Calculator.
Frequently asked questions
How much deposit do I need for a mortgage?
Lenders commonly offer mortgages from a 5% deposit, and the choice of deals and rates generally improves as the deposit grows to 10%, 15% and 20% or more. The right number depends on the price, the lender and your income, so ask a broker for the options at your level.
How long will it take to save a 10% deposit?
It depends on the price and what you can save. For a £280,000 home, £28,000 takes about 4 years 11 months at £400 a month from a £2,000 start with 4% interest, or around 3 years 5 months at £600 a month.
Is a Lifetime ISA worth it for a deposit?
The 25% government bonus on up to £4,000 a year is very valuable if you qualify and the home meets the conditions. The catches are the property price cap, the 12-month rule and the charge for withdrawing for other reasons, so read the current rules on GOV.UK first.
Should I invest my deposit to grow it faster?
For money you will need within a few years, most people keep it in cash, because investments can fall just before you buy. A longer timeline can justify more risk, but that is a personal decision, so consider speaking to a regulated adviser.
Can my parents help with my deposit?
Yes, many buyers use a gift from family. Lenders will usually ask for a letter confirming the money is a gift with no stake in the property, and your solicitor will check the source of the funds.