For many doctors, basic salary tells only part of the story.
Additional rostered hours, night duty, on call allowances, weekend work, NHS staff bank shifts and locum sessions can make up a significant part of your total income.
This can make a mortgage application more complicated because lenders do not all assess these payments in the same way.
Some lenders may consider all your regular additional income. Others may use an average, accept only a proportion or exclude certain payments altogether.
Manual underwriting can be helpful because it gives a human underwriter the opportunity to look at how your income is made up and understand the circumstances behind the figures.
It does not mean the lender will ignore its criteria or guarantee that your application will be accepted.
The quick answer
- Lenders assess overtime, allowances, bank work and locum income differently.
- The way your locum income is paid can affect how a lender assesses it.
- Manual underwriting means a human underwriter reviews the application in more detail.
- Manual underwriting does not mean that affordability, credit or evidence requirements are relaxed.
- Lenders usually consider how long you have received the income, how consistent it is and whether it is likely to continue.
- Being a doctor does not automatically mean that all your income will be accepted.
- Presenting the income clearly and approaching a suitable lender can make an important difference.
What counts as locum and overtime income?
A doctor’s payslip can contain several different types of income.
Resident doctors working under the 2016 contract in England may receive basic pay together with other payments such as:
- pay for additional rostered hours;
- enhancements for night duty;
- a weekend allowance;
- an on call availability allowance; and
- flexible pay premia in certain circumstances.
The BMA adopted the term “resident doctor” in place of “junior doctor” in September 2024. Pay arrangements and terminology can differ across England, Scotland and Wales.
Doctors may also complete work outside their contracted hours or normal job plan.
This can include:
- additional shifts;
- weekend clinics;
- extra theatre lists;
- waiting list work;
- NHS staff bank shifts; and
- locum sessions.
Some consultants also receive separate income from private practice.
You may arrange locum work through an NHS staff bank, an agency, an umbrella company or directly with a practice or trust. You may also provide services as a sole trader or through your own limited company.
We regularly speak to doctors who combine several types of income. You might have a substantive NHS position, complete regular staff bank shifts and accept occasional agency locum work.
It is this mixture of income that can make a doctor mortgage application more involved.
Why can this income be more difficult to assess?
Mortgage lenders must decide whether a mortgage is affordable.
This means looking not only at how much you earn today, but also at whether the income appears sustainable.
Basic salary is usually straightforward because it is set out in an employment contract and shown clearly on payslips.
Variable income can be more difficult because it may:
- change from month to month;
- depend on the rota;
- come from more than one employer;
- be paid at different intervals;
- include several types of allowance or enhancement; or
- stop when a placement or assignment ends.
A lender may therefore want to know:
- how long you have received the income;
- how regularly it is paid;
- whether it is contractual or voluntary;
- whether the amount changes significantly;
- whether there have been gaps between assignments; and
- whether it is reasonable to expect the income to continue.
Every lender has its own criteria. This means the same income can be assessed differently by different lenders.
What is manual underwriting?
Many lenders use automated systems for parts of the mortgage process. These systems may carry out credit scoring, affordability calculations and initial eligibility checks.
Manual underwriting means a human underwriter reviews the application in more detail.
The underwriter can examine the documents provided and consider the circumstances behind the figures.
For a doctor, this might involve looking at:
- how basic pay and additional pay are shown on the payslips;
- whether overtime has been received consistently;
- how locum work is arranged and paid;
- whether a recent employer change forms part of an ongoing training programme;
- whether staff bank work is likely to continue; and
- whether changes in pay can be explained by a rotation or career progression.
This does not mean the lender will overlook its normal rules.
The lender will still apply its criteria for income, affordability, credit history, deposit and the property.
Manual underwriting also does not guarantee that an application will be accepted or that a particular amount will be offered.
It simply gives the underwriter more opportunity to understand a case that may not fit neatly into an automated assessment.
Our guide to how manual underwriting can help new limited company business owners explains the process in more detail.
How might lenders assess different types of income?
The way your income is paid can be just as important as the amount you earn.
The following examples provide a general overview. The exact calculation and evidence required will depend on the lender.
Overtime, extra shifts and allowances paid through NHS payroll
Additional hours, enhancements and allowances paid through NHS payroll will usually appear on your payslips and P60.
Depending on the lender, it may:
- use all regular variable income;
- use a proportion of it;
- calculate an average over several months; or
- exclude payments that do not appear regular or sustainable.
A lender may treat contractual payments differently from voluntary overtime.
For example, additional rostered hours or a regular on call allowance may be assessed differently from occasional extra shifts.
The lender may ask for several recent payslips so that it can see how the payments change from month to month.
NHS staff bank work
NHS staff bank income may be paid through NHS payroll, sometimes on a separate payslip from your substantive position.
A lender may treat this income as:
- overtime;
- a second income; or
- your main income if staff bank work is your primary source of earnings.
The lender may consider how long you have completed staff bank work, how frequently you accept shifts and whether the income appears likely to continue.
It may ask for bank payslips, a P60 and personal bank statements showing the payments received.
Agency locum work paid through payroll
If a locum agency pays you through its payroll, you will usually receive payslips showing deductions for Income Tax and National Insurance.
Agency payments may be weekly, monthly or irregular. There may also be gaps between assignments.
A lender may average the income over a set period and ask for evidence that the work has been reasonably continuous.
Documents could include:
- agency payslips;
- personal bank statements;
- current and previous contracts;
- confirmation of assignments; and
- evidence of your work history.
Locum work through an umbrella company
In most cases, an umbrella company employs the worker and pays wages through PAYE. The agency normally finds the assignments.
The amount paid to the umbrella company is not necessarily the same as the gross income shown on your payslip.
Costs such as the umbrella company’s margin, employer National Insurance, pension contributions and holiday pay may be deducted before your gross pay is calculated.
You may receive a reconciliation statement explaining how the payment has been calculated.
Depending on the lender, the income may be assessed as employed income or under its contractor criteria.
The lender may ask for:
- payslips;
- reconciliation statements;
- contracts;
- assignment schedules; and
- personal bank statements.
Locum work through your own limited company
Some doctors provide locum services through their own limited company.
Where services are provided to a public sector organisation, such as an NHS trust, the off payroll working rules may affect how the engagement is taxed.
These rules are commonly known as IR35.
In most cases involving a public sector client, the client is responsible for deciding the doctor’s employment status for tax purposes. If the engagement falls within the rules, Income Tax and employee National Insurance are deducted from the relevant payment.
For mortgage purposes, many lenders assess limited company business owners using salary and dividends.
Some lenders may instead consider salary and the applicant’s share of company profit.
Company profit for a particular accounting period is not the same as retained profit accumulated over several years. Retained profit is not automatically treated as personal income.
Setting up or changing a limited company can have tax and accounting implications. Speak to your accountant before making decisions about your business structure or the way you are paid.
Locum work as a sole trader
Some doctors, including many locum GPs, work as sole traders.
Lenders will commonly assess this income using the net profit shown on HMRC tax calculations and tax year overviews.
The lender may ask for one or two years of finalised figures, although requirements vary.
Some lenders have criteria specifically for medical locum income. These lenders may consider more recent evidence, such as invoices, payment summaries, remittance statements and bank statements.
It is important to check the lender’s definition of locum income because it may not assess every working arrangement in the same way.
Income types at a glance
Overtime and allowances through NHS payroll
A lender may use all the regular income, a proportion of it or an average.
You may need to provide recent payslips, a P60 and bank statements.
NHS staff bank work
This may be assessed as overtime, a second income or your main income.
You may need to provide staff bank payslips, a P60 and evidence of your work history.
Agency locum work paid through payroll
The lender may average the income and consider any gaps between assignments.
You may need to provide payslips, contracts, bank statements and agency confirmation.
Umbrella company income
This may be assessed as employed income or under contractor criteria.
You may need to provide payslips, reconciliation statements, contracts and assignment details.
Income through your own limited company
This is commonly assessed using salary and dividends, although some lenders may consider salary and a share of company profit.
You may need to provide company accounts, tax calculations, tax year overviews, contracts and business bank statements.
Sole trader income
This is commonly based on the net profit shown on your tax documents.
Some lenders may consider recent locum evidence instead, depending on their criteria.
How much income history might you need?
There is no single rule that applies to every lender or every type of income.
Some lenders may consider a relatively short period of regular locum or overtime income. Others may want a longer and more established history.
The evidence required will depend on:
- how the income is paid;
- whether it is contractual or voluntary;
- whether you have another substantive position;
- how long you have worked in the medical profession;
- whether the income has been consistent;
- whether there have been gaps between assignments; and
- the lender’s individual criteria.
If you work as a sole trader or through your own limited company, lenders commonly ask for one or two years of finalised figures.
Some lenders may consider a shorter trading history where the wider circumstances support the application.
If your additional income is paid directly through payroll, the lender may ask for several recent payslips. Other lenders may want to see a longer pattern together with a P60.
A longer and more consistent income history can give an underwriter more evidence to consider. It does not guarantee that the income will be accepted.
Rotations, fixed term contracts and changing employers
Resident doctors in training commonly move between posts.
This can result in a new employer, a new contract or changes to the income shown on a payslip.
In some areas, a lead employer arrangement means that the same organisation remains the employer throughout several rotations. This can make the employment and payslip history easier to follow.
A lender may ask:
- how much time remains on the current contract;
- whether the next placement has been confirmed;
- whether the training programme is continuing;
- whether the employer will change;
- whether the salary will remain the same; and
- whether any regular allowances will continue.
Similar questions can arise when moving into a consultant or GP role, returning from leave or changing to less than full time working.
A lender that understands medical career progression may be better placed to assess the wider circumstances, although its normal criteria will still apply.
What can make an application more complicated?
The following situations do not necessarily prevent you from obtaining a mortgage, but they may require more evidence or explanation:
- income that changes significantly from month to month;
- gaps between assignments;
- a recent change in employer or agency;
- a recent move from payroll income to a limited company;
- several income sources paid at different times;
- payslips containing numerous allowances or adjustments;
- umbrella company statements that are difficult to interpret;
- a reduction in working hours;
- a return from maternity, parental or other extended leave;
- student loan repayments and other financial commitments;
- several mortgage applications or credit searches within a short period; and
- changes to your working arrangements made solely to support a mortgage application.
Clear documents and a sensible explanation can help the lender understand what has changed and why.
How Sarah Grace Mortgages can help
We understand that a doctor’s income does not always fit neatly into one box.
We will review how your income is made up and identify the documents available to support it.
We can then compare lenders whose criteria may suit your circumstances and explain how they are likely to assess each part of your income.
Where appropriate, we can present the income clearly to the lender and explain matters such as rotations, staff bank work, locum assignments or changes in the way you are paid.
We will also set realistic expectations before an application is submitted.
If you work as a sole trader or through your own limited company, we can liaise with your accountant with your permission.
You can read more about our specialist mortgage services or browse our frequently asked questions.
Frequently asked questions
Can overtime be used in a mortgage application for a doctor?
It may be possible.
Some lenders accept all regular overtime. Others use a proportion or calculate an average over several months.
The lender may consider how long you have received the overtime, whether it is regular and whether it appears likely to continue.
Do mortgage lenders accept locum income?
Some lenders can consider locum income.
The way it is assessed will depend on how you are paid, how long you have completed locum work and whether there have been any significant gaps.
Some lenders have criteria written specifically for medical locums.
Does manual underwriting mean my application is more likely to be approved?
No.
Manual underwriting means the application is reviewed in more detail by a human underwriter.
The lender will still apply its normal rules for income, affordability, credit history, deposit and the property.
Manual underwriting does not guarantee acceptance or a particular loan amount.
I have recently started locum work. Can I still apply for a mortgage?
Possibly.
Lenders ask for different lengths of income history. Some may also consider your previous experience in the same profession.
The options will depend on how the work is arranged, how you are paid and what evidence is available.
Will moving to a new rotation affect my mortgage application?
It may.
A new rotation could involve a new employer, contract, salary or set of allowances.
The lender may ask about your current contract, your next placement and the continuation of your training programme.
Can NHS staff bank income be included?
It may be possible if the income is regular and can be supported by payslips and bank statements.
The lender may assess it as overtime, a second income or your main income, depending on your circumstances.
Should I set up a limited company before applying for a mortgage?
This is a decision to discuss with your accountant.
Using a limited company can have tax, accounting and legal implications. It will also change the documents and income history available to a mortgage lender.
Do not change your business structure solely for a mortgage application without appropriate professional advice.
Speak to Sarah Grace Mortgages
If you would like to understand how a lender may assess your locum, overtime or staff bank income, our team is here to help.
Call us on 0203 6333 888 or contact us to arrange an initial conversation.
We advise clients across England, Wales and Scotland.
Important information
Your home may be repossessed if you do not keep up repayments on your mortgage.
Sarah Grace Mortgages Limited is authorised and regulated by the Financial Conduct Authority.
This article provides general information and does not constitute personalised mortgage, tax, legal or accounting advice.
Mortgage availability and the amount you can borrow will depend on your individual circumstances, income, expenditure, credit profile, proposed mortgage term, property, valuation, lender criteria and full underwriting.
NHS pay arrangements, tax rules and lender criteria can change. This article reflects our understanding as of October 2026.
