Remortgaging

Self-employed remortgaging works differently to your first application

Priya Nathwani, WatchMyMortgage · 18 September 2026 · 6 min read

Your first mortgage as a self-employed borrower probably felt like the hard part: two years of accounts, an accountant's letter, a lender picking apart your income. Remortgaging isn't a repeat of that process. The documents lenders want shift, the years they look at shift, and one route lets you avoid the affordability re-check altogether. Here's what's actually different, and a worked example of how much a lender's income method can move your borrowing.

The years a lender looks at move forward

Your first application was assessed against whatever accounts you had at the time, often just enough trading history to qualify. A remortgage looks at your two most recent years, not the two you used originally. If your business has grown since then, that's good news: a lender working from stronger recent figures can offer more than the one that assessed you three years ago. If a slow year sits inside that two-year window, even a strong first year before it won't offset it much, because most lenders weight the two years close to equally rather than averaging in your favour.

How lenders calculate your income isn't uniform

Some lenders average your last two years' net profit or salary-plus-dividends. Others take the lower of the two years outright, on the assumption that the worse year is the safer one to lend against. A smaller number will use the latest year alone if it's higher and your accountant can show the growth is genuine rather than a one-off. The same set of accounts can produce three different income figures depending on which lender is reading them, and the gap between the most conservative and most generous method is often the difference between a remortgage that covers what you need and one that falls short.

The documents you'll actually be asked for

Most lenders still want two to three years of SA302s and tax year overviews, or full accounts prepared by a qualified accountant if you trade through a limited company. A specialist lender may accept just one year if your trading history is thin but your figures are strong and consistent. Have your most recent year's accounts finalised before you apply where possible; a remortgage assessed on a draft or estimated final year tends to get valued more conservatively than one backed by filed figures.

Product transfers skip the affordability check entirely

If your income has dropped, or you've had a weaker year that would fail a new lender's assessment, a product transfer with your existing lender doesn't re-run your affordability at all. You're re-priced onto one of that lender's current deals on the loan you already hold, with no new accounts, no valuation, and no risk of the application being declined on income grounds. It's rarely the cheapest rate on the market, but for a self-employed borrower whose most recent year would work against them, it can be the only realistic route that doesn't require waiting out a stronger year first.

A worked example

Say your net profit was £58,000 two years ago and £72,000 last year, and you're remortgaging a £240,000 balance. A lender that averages the two years works from £65,000, while a lender that uses the latest year alone works from £72,000. At a typical self-employed affordability multiple of around 4.5 times income, that's the difference between roughly £292,500 and £324,000 of maximum borrowing, a gap of over £30,000, well beyond what most people would expect from two lenders looking at the same set of accounts. If your existing balance sits close to the lower figure, both lenders clear it comfortably; if it sits between the two, the lender's calculation method decides whether you qualify at all.

What to do before you apply

Get your most recent year's accounts filed rather than estimated, since a finalised set is treated more favourably than a draft. Ask your accountant for a reference letter confirming the figures are representative of ongoing trading, not inflated by a one-off contract or asset sale, because underwriters flag anything that looks like an outlier. If your latest year is meaningfully stronger than the one before it, a broker can point you toward the lenders known for using the latest-year or lower-weighted average methods rather than a flat two-year average, since that choice alone can be worth tens of thousands in borrowing power, as in the example above. And if your loan-to-value has improved since you last applied, that's worth checking independently of the income question, since it moves the rate you're offered regardless of which lender assesses your accounts.

Examples are illustrative and rounded. Your own mortgage offer and lender confirm your actual figures and dates. This is information, not financial advice. For advice on your circumstances, speak to a mortgage adviser regulated by the FCA.