Self Employed Mortgage Calculator — How Much Can You Borrow?

Being self employed shouldn't mean you're stuck guessing what you can borrow while everyone with a payslip gets a straight answer. This tool exists because lenders genuinely do assess each type of self-employment differently, and a generic salary-based calculator just isn't built to reflect that.

A typical affordability calculator takes one number - your salary - and multiplies it. But your situation probably isn't that simple. Sole traders get judged on net profit. Company directors are usually assessed on salary plus dividends, or increasingly salary plus their share of retained profit. Contractors, meanwhile, can often skip the whole profit-and-loss conversation and use their day rate instead.

Tell it which of those applies to you, and you'll get a number that's actually grounded in how underwriting works - not a one-size-fits-all guess.

Two years of accounts or SA302s is the sweet spot - it's what unlocks the widest range of lenders and generally the sharpest rates too. This is what most people end up providing.

Only got one year behind you? It's still workable with a smaller pool of lenders, usually in exchange for a bigger deposit (think 15-25%) and occasionally a slightly lower income multiple. If you're a contractor with just six months under your belt, a handful of specialist lenders will still consider you, especially if your prior employment was in a related field.

One thing worth knowing: self-certifying your income isn't a thing in the UK anymore - every lender wants proof. And a rising profit trend genuinely does count in your favour. Applying with a partner? The mortgage affordability calculator handles combined incomes.

Getting this sorted before you apply saves a lot of back-and-forth later. Lenders will typically ask for:

SA302 tax calculations from HMRC, usually the last two years. Tax year overviews, which simply confirm what's on your SA302. If you're a director, company accounts prepared by your accountant, again for two to three years.

Add business bank statements (often three to six months' worth), and if you're a contractor, proof of your current or upcoming contract helps a lot. Honestly, the single easiest thing you can do to strengthen an application is just keeping your accounts filed and up to date - it removes a whole category of delays.

As a ballpark, expect somewhere around 4 to 4.5 times your assessable income - basically the same multiple an employed applicant would get. So £40,000 of income puts you in roughly the £160,000-£180,000 range.

Higher earners, certain professions, or applicants going through a broker can sometimes stretch to 5 times or beyond, and in specific cases a handful of lenders will go as far as 6×. A bigger deposit, a clean credit file, and low existing debt all help you land nearer the top of that range rather than the bottom. Curious how this stacks up against a straightforward salary assessment? The mortgage in principle calculator is worth a quick comparison.

Keep two to three years of clean accounts on file and file your returns on time - lateness and gaps both raise questions. Try to show income that's stable or climbing; underwriters reward consistency far more than one great year.

A bigger deposit lowers your LTV and opens up more of the market. Paying down debt, both personal and business, before you apply helps too. And it's worth checking your credit file for errors well before you need it.

Honestly, the biggest lever is often using a broker who specialises in self-employed cases. Because every lender treats this income differently, the right match can change your outcome dramatically. Thinking further ahead? Take a look at the remortgage calculator and the house equity calculator for what comes after.

Take a sole trader who made £45,000 in net profit last year and £40,000 the year before, sitting on a £40,000 deposit.

Since the trend is upward, lenders default to the two-year average - £42,500. At the standard 4.5× multiple, that works out to borrowing of roughly £191,250, which with the deposit added supports a property up to about £231,250.

Spread over 25 years at 5%, that's a monthly repayment of around £1,118. A director assessed on salary plus retained profit, or a contractor on a solid day rate, could well land higher than this. Worth punching your own figures into the calculator above to see exactly where you'd land.

Where to check these figures yourself: pull your own numbers from HMRC's SA302 tax calculations, read the independent guidance on MoneyHelper, and check self-assessment deadlines directly on GOV.UK. Every other tool on this site lives on the mortgage calculators homepage.