How much can you borrow on your day rate?
A high-street calculator asks for your salary and dividends, then quietly shrinks the answer. This one does what a specialist lender does: it reads your contract rate and shows the borrowing it can really support.
The maths the high street won’t do for you
Contractor income is annualised as day rate × days per week × 46 weeks, then multiplied — usually by 4.5. It is a simple formula, but most retail bank calculators never apply it, because they are built to read payslips and tax returns rather than a live contract.
When you put your details into a high-street portal, you are pushed into the “self-employed” box. That box asks for two or three years of SA302s and historic accounts — figures that, for a tax-efficient contractor, almost always understate what you genuinely earn. The result is an offer far below your real means, or an outright decline.
Contract-based underwriting takes a different route. Instead of looking backwards at accounts, it looks at the contract in front of you and prices the mortgage off your gross rate. The calculator above models exactly that.
A worked example
From a daily rate to a borrowing figure
£115,000 × 4.5 = £517,500 indicative borrowing
The same contractor assessed on a £40,000 SA302 might be offered around £180,000. The contract rate, read correctly, unlocks the rest.
That gap — between what your accounts show and what your contract earns — is the entire reason the specialist contractor mortgage market exists. The figure is indicative: your deposit, credit profile, monthly commitments and the property all feed into the final number. But it is a far more honest starting point than a salary-and-dividends calculator.
What changes the number
- Days per week. Most lenders annualise on a five-day week. Four-day contracts are assessed pro-rata.
- The multiple. 4.5× is the common standard. Higher earners can reach 5× or more with some lenders; high loan-to-value cases may sit at 4×.
- Deposit. A larger deposit opens better rates and, in some cases, a higher multiple.
- Credit and commitments. Existing loans, cards and dependents reduce the affordable figure regardless of income.
- Contract gaps. A clean recent contracting history helps; long unexplained gaps can narrow the lender pool.
Who this calculator is for
It works for any professional paid a day or hourly rate against a contract: IT and tech contractors, engineering and offshore specialists, management consultants and interim executives. CIS subcontractors are assessed on gross posted income, and limited company directors can often add retained profit on top — both can borrow more than this single figure suggests. Speak to an adviser to model your exact position.
Contractor borrowing, answered
How is contractor borrowing calculated from a day rate?+
Specialist lenders annualise your contract rate as day rate × days worked per week × 46 weeks, then apply an income multiple — typically 4.5×. A £500 day rate over five days becomes £115,000 a year, supporting roughly £517,500 of borrowing before deposit and affordability checks.
Why 46 weeks and not 52?+
Capping the year at 46 weeks builds in a six-week buffer for holidays, illness and gaps between contracts. It is a deliberately cautious figure that reassures the lender your income is sustainable across a realistic working year.
Is the calculator’s figure a mortgage offer?+
No. It is an indicative estimate to show the borrowing your rate could support. A real figure depends on the lender, your deposit, credit history, existing commitments and the property. An adviser confirms what you can actually borrow.
Do I need two years of accounts to borrow this much?+
Not with contract-based underwriting. The right lenders assess your current contract rather than historic accounts or SA302s, which means newly independent contractors — sometimes from day one of a contract — can borrow on the same basis as established ones.
Can I borrow more than 4.5× my annualised income?+
Sometimes. A number of lenders now stretch to 5× or more for higher-earning professionals who meet loan-to-income and affordability criteria. Others sit at 4× for high loan-to-value cases. The calculator uses 4.5× as a sensible middle estimate.