Question 1

Can overtime income be used for a mortgage?

Accepted Answer

Yes — overtime income can be used in a mortgage affordability calculation, and many lenders actively accept it as a recognised component of total earnings. Whether your overtime is included, and how much of it counts, depends on the type of overtime (guaranteed versus non-guaranteed), how long you have been receiving it, and how consistently it appears on your payslips. Lenders do not automatically include all overtime at face value, but a documented track record of regular overtime payments — evidenced by payslips and a P60 — gives underwriters the confidence to include a meaningful proportion of it. For borrowers in roles where overtime is a structural part of the pay package (NHS staff, emergency services, shift workers in manufacturing or logistics), specialist lenders and brokers familiar with those employment sectors will often achieve better outcomes than applying direct to a high street lender.

Question 2

What is the difference between guaranteed and non-guaranteed overtime?

Accepted Answer

Guaranteed overtime is overtime that your employment contract states you will receive and your employer is obliged to offer — and that you are required to work. Because this income is contractually committed on both sides, lenders treat it with similar confidence to basic salary: it is a known, recurring element of your pay with a legal basis. Non-guaranteed overtime is income your employer may offer and you may choose to accept, but neither party is contractually bound. Many employees work substantial non-guaranteed overtime consistently for years, but from a lender's perspective it remains discretionary because either you or your employer could stop it at any point. Most lenders will still include non-guaranteed overtime in affordability calculations, but at a discounted rate — commonly 50–75% of the average amount — to reflect the risk that it might not continue at the same level. The distinction is usually found in your employment contract; if your contract specifies a minimum overtime commitment, that element is treated as guaranteed.

Question 3

How much of my overtime income will lenders count?

Accepted Answer

For guaranteed overtime, most lenders will include 100% of the contractual amount, provided it is clearly specified in your employment contract and consistently appears on your payslips. For non-guaranteed overtime, the typical range is 50–75% of an averaged figure, though some lenders are more generous and others more restrictive. The average is usually calculated over the most recent three, six, or twelve months of payslips, or using the P60 figure for the most recently completed tax year. If your overtime income has been growing, a shorter averaging window (three months annualised) tends to produce a higher income figure; if it has been declining or was particularly high in a previous year, the P60 approach may overstate current earnings. Some lenders cap the proportion of total income that variable pay (including overtime) can represent — for example, limiting total variable pay to no more than 50% of declared income — so if your overtime is large relative to your basic salary, lender selection becomes particularly important.

Question 4

How long do I need to have been earning overtime before a lender will count it?

Accepted Answer

Most lenders require a track record of at least three to six months of consistent overtime before they will include it in affordability calculations. This reflects the view that a short period of overtime could be temporary or coincidental rather than a reliable ongoing feature of your income. Some lenders require a full twelve months of evidence — often assessed using your P60 for the most recently completed tax year, which captures overtime earnings across a full annual cycle. If you have recently changed jobs but have a longer history of overtime in a similar role with a previous employer, some lenders will consider that track record if it is evidenced by payslips or a reference letter from the former employer, though this is assessed on a case-by-case basis. Starting a new role with overtime from the outset is treated cautiously — even if overtime payments appear in your first few months of payslips, lenders typically want to see continuity over a meaningful period before relying on it for affordability.

Question 5

What evidence do I need to prove overtime income for a mortgage?

Accepted Answer

The standard evidence for overtime income is recent payslips — most lenders require the last three months, and many prefer six or twelve months for variable income. Your payslips should clearly show the breakdown between basic pay and overtime (or shift allowances and other variable components), so the lender can identify the overtime element separately from your base salary. A P60 for the most recently completed tax year is also valuable, as it gives a full twelve-month picture of total earnings including overtime and can corroborate that the level of overtime shown on recent payslips is consistent with your annual pattern. If the nature of your overtime arrangement is not self-evident from payslips, a letter from your employer confirming whether the overtime is contractually guaranteed and whether it is expected to continue is a useful supporting document. Bank statements showing regular monthly credits that correspond to your payslip figures provide additional corroboration and are standard evidence in any mortgage application.

Question 6

Can I use overtime income alongside my basic salary for affordability?

Accepted Answer

Yes — lenders who accept overtime will typically combine your basic salary and your assessed overtime income to reach a total income figure, against which they apply their income multiple to calculate the maximum loan. For example, if your basic salary is £35,000 and a lender accepts 75% of your average overtime of £8,000 per year, they would assess your total income as £41,000 and lend against that figure. The proportion of income derived from overtime does matter: some lenders have a maximum threshold, such as requiring basic salary to represent at least 50% of total declared income, to ensure the application is not heavily reliant on variable pay that could be withdrawn. For borrowers in roles where overtime is substantial — such as emergency services workers, NHS staff on bank shifts, or production workers on incentive overtime — choosing a lender with higher variable pay thresholds, or one that treats your specific employment sector more generously, can materially increase your borrowing capacity. Ensure your repayments remain affordable on your basic salary alone if overtime reduces or stops.

Question 7

Do all lenders treat overtime the same way?

Accepted Answer

No — lender treatment of overtime varies considerably, and this variation can have a significant impact on how much you can borrow. Some lenders include 100% of evidenced regular overtime with no haircut; others cap variable pay inclusion at 50%; some require twelve months of evidence while others accept three months; some require overtime to be contractually guaranteed before including any of it, while others include discretionary overtime as a matter of course. High street lenders tend to have more rigid, automated criteria that may discount or exclude overtime without detailed manual review. Specialist lenders and building societies with manual underwriting are often more flexible and better equipped to assess overtime income that is complex in nature — for example, NHS bank shifts alongside a contracted hours salary, or significant overtime in a sector they know well. Using a whole-of-market mortgage broker who works regularly with variable pay applications is the most effective way to identify which lender will treat your specific overtime pattern most favourably.

Question 8

I work shifts — is shift pay treated differently from overtime?

Accepted Answer

Shift pay and overtime are assessed using similar principles but are not always treated identically. Contractual shift allowances — premiums specified in your employment contract for working particular shift patterns (nights, weekends, bank holidays) — are generally treated more like guaranteed income and included in full or at a high percentage by most lenders, because they are a predictable, contractual element of your earnings. Non-contractual shift overtime — additional shifts you pick up above your contracted hours — is treated in the same way as other non-guaranteed overtime: averaged over recent payslips and typically included at 50–75%. Where your total pay is a blend of basic salary, a contractual shift premium, and variable overtime, it is important to evidence each component separately via payslips and your employment contract, so the lender can apply the right treatment to each. NHS bank shifts, for example, are voluntary additional work and are typically assessed as non-guaranteed overtime rather than contractual shift allowances, even though they are a common and stable income source for many NHS employees.

Overtime Income Mortgage FAQ