Most calculators give you a single optimistic number and skip the rest. This one shows you the honest timeline based on your real city, your real savings rate, and the LISA bonus most first time buyers forget to claim.
For most UK first time buyers, finding the deposit is harder than affording the mortgage payments themselves. A typical mortgage on a £250,000 property with a 10 percent deposit runs around £1,200 per month at current interest rates, which is comparable to renting a similar place in many cities. But saving the £25,000 deposit while also paying rent, bills, and basic living costs is where the real challenge lies.
The maths punishes renters specifically. A renter paying £1,000 per month is spending £12,000 per year on housing that builds them no equity, while trying to save another £6,000 to £8,000 per year for a deposit on top. Many people end up stuck in this loop for years, paying enough rent to easily cover a mortgage, but never quite saving fast enough to escape. The faster you can break out of this cycle, the more financial ground you cover, because every year delayed is another year of rent paid into someone else's mortgage.
The headline minimum deposit is 5 percent of the property price. On a £200,000 property, that is £10,000. However, lenders charge significantly higher interest rates on 95 percent loan to value (LTV) mortgages because they consider them riskier. A 5 percent deposit might mean an interest rate of 5.5 to 6 percent, while a 10 percent deposit could secure 4.8 to 5.2 percent.
The sweet spot for most buyers is between 10 and 15 percent. At 15 percent, you typically unlock a meaningful drop in interest rate, which on a £200,000 mortgage saves around £40 to £80 per month for the lifetime of the loan. At 20 percent, you get the very best rates available, but you also wait years longer to save the extra. The honest answer for most first time buyers is to target 10 percent as a minimum and stretch to 15 percent if your timeline allows it without losing too much momentum.
Beyond the deposit, you also need to budget for stamp duty (often £0 for first time buyers under £425,000), legal and survey fees of around £1,500 to £2,500, and moving costs of £500 to £2,000. A £25,000 deposit might mean you actually need £28,000 to £30,000 in total before completing.
If you are under 40 and planning to buy a property under £450,000 in the UK, the Lifetime ISA (LISA) is genuinely transformative. You can save up to £4,000 per year, and the government tops up your contributions by 25 percent, paid annually. That is a free £1,000 per year, which over a five year savings period adds up to £5,000 of pure bonus money you would otherwise leave on the table.
The catch is the rules. You must open the LISA before age 40 (though you can keep contributing until 50). You can only use it for a first home purchase under £450,000, or for retirement after age 60. Withdrawing for any other purpose triggers a 25 percent penalty, which actually means losing 6.25 percent of your own contributions on top of the bonus.
Both cash LISAs and stocks and shares LISAs exist. Cash LISAs work like savings accounts, paying interest plus the government bonus. Stocks and shares LISAs invest in markets, with potentially higher returns over long periods but also short term volatility. For deposits within five years, cash LISAs are usually the safer choice.
The realistic plan in this calculator shows what your timeline looks like at your current saving rate. The aggressive plan shows what happens if you increase savings by 50 percent. The gap between them is usually striking, often shaving years off the timeline. But aggressive is not always practical. Working out which lever you can actually pull is the real exercise.
Three lifestyle changes typically free up the most cash. Rent reduction through a house share or moving slightly further out can save £200 to £500 per month, more than most other strategies combined. Subscription audits and food spending control typically free up £80 to £150 per month, less impactful but easier to implement. Income increases through job changes or pay rises are often the highest impact lever, because every additional pound earned can flow directly into savings if you avoid lifestyle inflation. Buying with a partner or friend halves the timeline almost overnight, because joint applicants combine both incomes for borrowing power and double the savings rate.
Where you buy matters as much as how much you save. The deposit needed for a £170,000 flat in Liverpool is £17,000, achievable in around three years for many savers. The same 10 percent on a £525,000 London flat is £52,500, often a decade or more away. Many first time buyers solve this by buying their first home outside their forever location, building equity for three to five years, then selling and moving up. The trade off is that buying in a city you do not want to live in long term means renting somewhere else, which gets expensive. The maths only works if your starter location is somewhere you can realistically live for at least three years.
Three concrete steps. One: open a LISA today if you are eligible. The April 5th tax year deadline matters because the £4,000 annual allowance does not roll over. Missing one tax year means losing £1,000 of free government money permanently. Even putting in £1 establishes the account and starts the clock on the one year holding period required before you can withdraw for a first home.
Two: set up an automatic monthly transfer the day after payday. Pay yourself first. If you wait until the end of the month to save what is left, the answer is almost always nothing. Treating savings as a fixed bill that comes out automatically is the single most reliable way to build a deposit consistently. Even £200 per month with the LISA bonus becomes £3,000 per year.
Three: get a free Decision in Principle from a mortgage broker once you are within 18 months of having the deposit. This soft search shows you exactly how much you can borrow, what your monthly payments would be, and whether your salary qualifies for the mortgage you need. It also makes you a serious buyer in the eyes of estate agents, which can dramatically affect your ability to secure a property in competitive areas.
For an average UK property at around £285,000 with a 10 percent deposit of £28,500, the typical first time buyer saving £300 to £400 per month takes 5 to 8 years to reach the deposit. In London, where the average property is £525,000, the same saver would need 10 to 14 years without a LISA bonus or a salary increase. This calculator shows your exact timeline based on your real numbers, including the LISA bonus where eligible.
The minimum deposit for most UK mortgages is 5 percent of the property price, though 10 percent gets you significantly better mortgage rates and 15 to 20 percent unlocks the cheapest deals. On a £250,000 property, a 5 percent deposit is £12,500 while a 10 percent deposit is £25,000. Most lenders also require evidence of stable income and an emergency fund on top of the deposit.
For most first time buyers under 40 buying a property under £450,000, the LISA is a no brainer. You can save up to £4,000 per year and the government adds a 25 percent bonus on top, a free £1,000 per year. Over 5 years that is £5,000 of free money. The catch is that properties over £450,000 do not qualify, and withdrawing for any other reason triggers a 25 percent penalty.
UK house prices have grown faster than wages for two decades, while rents in major cities now consume 30 to 40 percent of take home pay, leaving very little to save. The result is that the average UK first time buyer is now around 34 years old, compared to 28 in the early 2000s. The realistic path for most people requires either a high savings rate, family help, or moving to a cheaper area.
A cash LISA works like a savings account, paying a fixed or variable interest rate on top of the government bonus. Your money is FSCS protected up to £85,000 and cannot fall in value. A stocks and shares LISA invests in the stock market, which historically delivers higher returns over long periods but can fall in value in the short term. For deposits within 5 years, cash LISAs are usually safer. For deposits more than 7 to 10 years away, stocks and shares LISAs typically outperform but carry capital risk.
Yes, and this is the single most effective way to halve your timeline. Joint applicants combine both incomes for borrowing power, doubling how much mortgage you can get. They also typically double the savings rate, because two people putting away £400 per month each builds £800 per month into the deposit pot. Both partners can also each have their own LISA, doubling the government bonus to £2,000 per year combined. Friends, siblings, and partners can all buy together, though legal arrangements should be set up properly to protect each party.