A useful UK rule of thumb is this: do not ask only “how many times my income can I borrow?” Ask whether the mortgage payment would still feel manageable after your normal bills, debts, childcare, travel, insurance, savings, buying costs and possible future changes.

Most lenders do not rely on one simple rule. They usually assess your income, regular commitments, deposit, credit history, property type, loan-to-value and whether the mortgage fits their affordability criteria.

Plain English: the mortgage you can afford is not always the biggest mortgage a lender might consider. It is the mortgage that fits your real budget and can be evidenced properly when you apply.

This guide is for general information only and is not personal mortgage advice. Your options depend on your circumstances and lender criteria at the time you apply.

How much mortgage can I afford in the UK?

There is no single UK mortgage affordability rule that applies to everyone.

A rough income multiple may help you set an early budget, but it is only a starting point. public guidance notes that the amount you can borrow is usually assessed using your income and spending, and its affordability calculator asks about income, expenses, repayments and money left over each month.

GOV.UK also explains that lenders check whether you can afford the mortgage as part of the home-buying process.

A more useful starting question is:

“What monthly mortgage payment could I comfortably maintain after my normal commitments and after keeping some money aside?”

That matters because two buyers with the same salary can get very different outcomes. One may have no debts and low fixed costs. Another may have car finance, childcare, credit card balances or maintenance payments, which can reduce affordability.

A practical way to start is:

If you want your figures sense-checked before making an application, you can make a finance enquiry or speak to a mortgage adviser.

How many times my salary can I borrow for a mortgage?

Many UK borrowers start by looking at income multiples. A common broad range is around four to five times income, although some lenders may consider more or less depending on the case.

That does not mean you can rely on a fixed multiple.

The amount you may be able to borrow can change because of:

• your income type;
• whether you apply alone or jointly;
• debts and credit commitments;
• childcare or maintenance costs;
• deposit size and loan-to-value;
• credit history;
• mortgage term;
• property type;
• lender criteria;
• current mortgage pricing and affordability assumptions.

For example, a borrower with a high income but large car finance and childcare costs may be able to borrow less than someone with a lower income but very few commitments.

Use salary multiples as a rough filter only. Before viewing properties or making offers, it is usually better to check affordability using current lender criteria.

Is a £30,000 salary enough to buy a house?

It can be, but it depends heavily on the property price, deposit, location, debts and monthly budget.

A £30,000 salary does not automatically rule someone in or out. The key questions are:

• How much deposit do you have after keeping money aside for fees and moving costs?
• Are you buying alone or with another applicant?
• Do you have loans, car finance, credit cards, childcare or maintenance payments?
• Is your credit history clean enough for the lenders you are considering?
• Are you looking in an area where suitable properties fit your budget?
• Would the monthly payment still feel manageable alongside bills and other costs?

For a sole buyer on £30,000, affordability may be more constrained in higher-priced areas. A larger deposit, lower debts, a longer mortgage term or buying with another applicant may change the picture, but none of those guarantee a mortgage.

If your income is around this level, it is sensible to work backwards from your monthly budget rather than starting with the maximum property price.

What salary do I need for a £300,000 mortgage?

There is no universal salary requirement for a £300,000 mortgage.

A simple income multiple might suggest that a £300,000 mortgage could require a household income somewhere around the mid-to-higher five figures, depending on the multiple used. But that is only a rough illustration, not a lender decision.

A lender would usually also consider:

• whether the income is employed, self-employed or variable;
• how much of any bonus, overtime or commission it will accept;
• monthly commitments;
• dependants and childcare costs;
• deposit size and property value;
• credit conduct;
• mortgage term;
• whether the property is acceptable security.

For example, two households both earning £70,000 could receive different affordability outcomes if one has no debts and the other has car finance, loans and childcare costs.

If you are targeting a £300,000 mortgage, do not rely only on a salary calculation. Check the monthly payment, the deposit, the wider buying costs and the lender route before committing to a property.

Is the 28/36 rule useful in the UK?

The 28/36 rule is a budgeting rule sometimes used to compare housing costs and debt payments with income. It can be useful as a personal sense-check, but it is not a UK mortgage approval rule.

A better public UK reference point is public guidance’s affordability calculator because it asks about income, expenses, repayments and money left over each month. public guidance also makes clear that calculator results are estimates and that lenders have their own criteria.

The useful way to use any rule is:

1. Use it to avoid an obviously stretched budget.
2. Compare it with your real monthly spending.
3. Include debts, childcare, maintenance, student loans and credit commitments.
4. Keep cash aside for buying costs, repairs and emergencies.
5. Check the lender route before making decisions.

In plain English: the maximum mortgage and the sensible mortgage are not always the same number.

Want personalised mortgage advice? Call 0333 335 6595 or send an enquiry if you want your income, commitments and deposit sense-checked before relying on an affordability figure.

Who should use this affordability guide?

This guide is relevant if you are:

• buying your first home;
• moving home;
• comparing property budgets;
• trying to understand whether your deposit is enough;
• worried about how debts or commitments affect affordability;
• self-employed or using variable income;
• deciding whether to use an online calculator or speak to a broker;
• considering whether to buy now, wait, remortgage or move.

It is especially useful at the early budgeting stage. At this point, you may not need a full mortgage application, but you do need a realistic view of what could be affordable.

Online calculators can be helpful, but they can make affordability look simpler than it is. They often cannot reflect how a specific lender will treat income type, regular commitments, dependants, credit history or the property.

James Blackler, our mortgage broker at The Mortgage Blog, usually recommends starting with the real-life budget first. That means checking what you can afford each month before chasing the largest possible borrowing figure.

What actually affects how much mortgage you can afford?

The amount you can afford usually depends on three connected numbers:

1. The property price
2. The deposit and buying costs you have available
3. The monthly payment you can comfortably maintain

Many people start with the property price. That is understandable, but it can lead to frustration if the mortgage or monthly payment does not fit.

A better approach is often to work backwards:

• How much deposit do I have after legal fees, survey costs, removals and any tax?
• What monthly payment would fit my budget without leaving me exposed?
• Which debts or commitments will a lender include?
• Is my income straightforward and easy to evidence?
• Would the mortgage still feel manageable if costs changed?
• Is the property likely to meet lender criteria?

public guidance’s home-buying guidance encourages borrowers to think about deposits, repayments and budgeting. GOV.UK also highlights that buying a home involves costs beyond the purchase price.

This is where many borrowers discover a gap between what they could theoretically borrow and what they would feel comfortable paying.

That gap is important. A mortgage that passes a lender’s affordability assessment may still feel tight if your work pattern, family costs or household bills change.

Example scenario: the income multiple looks fine, but the monthly budget does not

A couple moving from a rented flat to their first house may look comfortable on a simple salary multiple. Suppose one applicant has a stable employed salary and the other has a basic salary plus regular overtime. They have saved a deposit and an online calculator suggests a property budget that feels within reach.

The problem appears when the full budget is checked. They have car finance with two years remaining, nursery fees due to start shortly after the move, a credit card balance they planned to clear “after completion”, and they have not allowed enough for legal fees, removals, buildings insurance, furnishings and a basic emergency fund.

A broker would not only ask, “What can you borrow?” The better questions are:

The practical lesson is that affordability is not just a borrowing ceiling. It is a combination of lender criteria, document evidence and household cash flow. In this type of situation, a slightly lower property budget, clearing a commitment before application, or choosing a lender that treats variable income appropriately may be more sensible than chasing the largest possible mortgage.

How might lenders assess affordability?

Each lender has its own criteria, but affordability assessments commonly include the following areas.

Income

Lenders usually need evidence of your income. Depending on your situation, this may include payslips, bank statements, accounts, tax calculations, employment contracts or other documents.

Income can be straightforward or complex. A permanent salary is often easier to evidence than income made up of overtime, bonus, commission, dividends, retained profits or self-employed earnings.

That does not mean complex income cannot be used. It means the lender will decide how much of it it is prepared to include.

Expenditure and commitments

Lenders usually look at committed spending, which may include:

• personal loans;
• car finance;
• credit cards;
• student loan deductions where relevant;
• childcare costs;
• maintenance payments;
• existing mortgage or rent commitments;
• regular financial obligations.

They may also use household expenditure assumptions as part of their affordability model.

Student loans are a good example. A student loan is not usually assessed in the same way as a normal personal loan, but repayments can still affect monthly income. GOV.UK explains how student loan repayments work, and lenders may factor the deduction into affordability.

Deposit and loan-to-value

Your deposit affects the loan-to-value, often shortened to LTV. This is the mortgage as a percentage of the property value.

For example, if you buy a property for £300,000 and need a £240,000 mortgage, the LTV is 80%.

The size of your deposit can affect which products may be available, although this depends on lender criteria and market conditions. A larger deposit can reduce the mortgage needed and may improve the range of possible options.

Credit history

Lenders usually review your credit profile. They may look at payment history, current borrowing, recent applications, defaults, county court judgments, missed payments and overall conduct.

A credit issue does not always mean you cannot get a mortgage, but it can narrow the choice of lenders and affect how the case is assessed.

The details matter: when the issue happened, how much it was for, whether it has been satisfied and what the rest of the application looks like.

Property type

The property itself also matters. Some homes are more complex for lenders, such as certain flats, unusual construction types, properties with short leases or homes with significant defects.

A borrower may look affordable on paper, but the property still needs to meet lender requirements and valuation standards.

Interest rate environment

The Bank of England Bank Rate influences the wider interest rate environment. Mortgage rates are not the same as Bank Rate, but changes in the rate environment can affect borrowing costs and lender pricing.

That is why affordability should be reviewed close to the time you apply. Old estimates may not reflect current pricing, lender criteria or your latest circumstances.

What can make affordability harder?

Do not assume every lender works the same way. Choosing the wrong route can waste time or create an avoidable decline.

You may need tailored mortgage advice if:

• you are self-employed;
• you receive dividends, retained profits, bonus, overtime or commission;
• you have recent credit issues;
• you have a small deposit;
• you are buying a non-standard property;
• you have multiple income sources;
• you are using gifted deposit funds;
• you are buying with another person who has different income or credit circumstances;
• you already own property;
• you are considering buy-to-let rather than a residential mortgage;
• your income is due to change soon;
• you have significant childcare, loan or maintenance commitments.

A decision in principle can help, but it is not a guaranteed mortgage offer. Lenders may still need to verify documents, review the property and complete underwriting.

You may also need separate legal, tax or financial advice depending on the transaction. Stamp duty land tax, ownership structure, gifted deposits, protection planning and tax treatment can all have consequences beyond the mortgage itself.

What do affordability calculators usually miss?

Affordability calculators are useful for a first estimate, but they cannot always reflect lender-specific details.

A calculator can be a useful first step. It should not be treated as a lender decision.

Which mistakes make mortgage affordability harder?

The biggest mistake is treating a rule of thumb as if it were a mortgage offer.

Focusing only on income multiples

Income is important, but it is not the full affordability test. Lenders also consider commitments, dependants, credit conduct, deposit, property details and their own criteria.

If you only use a multiple of income, you may overestimate or underestimate what is realistic.

Forgetting buying costs

Your deposit is not the only cash you need. GOV.UK’s home-buying guidance highlights that buying a home involves costs beyond the purchase price.

Depending on the transaction, you may need to budget for:

• conveyancing or legal fees;
• valuation or survey costs;
• mortgage product or arrangement fees;
• broker fees, if applicable;
• removals;
• buildings insurance;
• stamp duty land tax where applicable;
• initial repairs, furnishings or moving costs.

If you use all your savings as deposit, you may leave yourself with too little cash for the transaction and early ownership costs.

Ignoring debts before applying

Loans, car finance and credit card balances can reduce affordability. Paying down debt may help in some cases, but it depends on the figures and timing.

Do not assume closing or clearing a commitment will automatically produce the result you want. It is worth checking before making changes, especially if you are close to applying.

Assuming all lenders assess income the same way

They do not. This is particularly important if you have:

• bonus income;
• overtime;
• commission;
• zero-hours or variable hours;
• agency work;
• self-employed income;
• dividends;
• multiple jobs;
• future pay rises;
• maternity, paternity or adoption leave circumstances.

Some lenders may be more flexible than others, but criteria change and the details matter.

Getting a decision in principle with the wrong lender

A decision in principle can be helpful, but it is not a final mortgage offer. It may also involve a credit check, depending on the lender and process.

The risk is not just being declined. It is applying in the wrong place first and creating avoidable stress.

For complex cases, the value of advice is often in knowing where not to apply as much as where to apply.

Stretching the budget too far

A lender may assess affordability one way, but you still need to live with the payment.

Think about:

• future childcare costs;
• commuting changes;
• energy bills;
• insurance;
• repairs and maintenance;
• changes in income;
• emergency savings;
• future remortgage risk.

A mortgage should not leave you permanently relying on perfect conditions.

What could mortgage affordability look like in practice?

These examples are illustrative only. They are not lender decisions.

What documents make affordability easier to assess?

Having documents ready does not guarantee approval, but it can make the advice and application process clearer.

Useful documents often include:

• proof of ID;
• proof of address;
• recent payslips if employed;
• recent bank statements;
• employment contract if income has recently changed;
• latest P60 where useful;
• details of bonus, overtime or commission;
• SA302s or tax calculations if self-employed;
• tax year overviews where relevant;
• company accounts if applicable;
• proof of deposit;
• gifted deposit letter and evidence where relevant;
• details of loans, car finance and credit cards;
• student loan deduction information where relevant;
• evidence of maintenance income or payments where relevant;
• property details if you have found a home.

Self-employed borrowers should also make sure tax returns and income evidence are consistent. GOV.UK’s Self Assessment guidance explains the tax return process, but mortgage lenders will still apply their own rules when deciding what income they can use.

What should you check before deciding your budget?

Before deciding what mortgage you can afford, check:

• your maximum comfortable monthly payment;
• whether that payment includes insurance and household bills;
• your deposit after buying costs;
• whether you need to keep an emergency fund;
• how long you plan to live in the property;
• whether your income is likely to change;
• whether your debts are temporary or ongoing;
• whether your credit file is accurate;
• whether the property type is straightforward;
• what happens if rates or costs change before you complete.

This is the difference between “Can I get a mortgage?” and “Can I live comfortably with this mortgage?”

When should you speak to a broker?

It is sensible to speak to a mortgage adviser before applying if:

• you are unsure how much you can borrow;
• your income is variable or self-employed;
• you have debts or childcare costs;
• your credit history is not perfect;
• your deposit is gifted or coming from several sources;
• you are buying an unusual property;
• you need to move quickly;
• you have had a mortgage declined;
• you are comparing whether to move, remortgage or wait.

A broker can help you understand what may be realistic, what documents are likely to be needed and which lender criteria may fit your circumstances. That does not guarantee a lender will approve the case, but it can reduce the risk of applying in the wrong place.

Before choosing an adviser, check:

• whether the adviser is tied, restricted or whole-of-market;
• what fees apply and when they are payable;
• which lenders or products may be excluded;
• whether your income, deposit and property type fit the suggested route;
• what happens if the first lender does not accept the case.

Make an enquiry if you would like us to look at your situation. We cannot promise a lender will approve the case, but we can help you understand the likely options and next steps.

Useful related guides:

• specialist lending options
• speak to a mortgage adviser
• is buying investment property as your first home feasible
• how do mortgages work
• mortgage deals for first time buyers
• does student loan affect mortgage
• new build mortgages

What should you read next?

• Nationwide Helping Hand mortgage
• Joint borrower sole proprietor mortgage
• UK swap rates and mortgages

FAQs

How much mortgage can I afford?

There is no single answer. It depends on your income, deposit, debts, credit history, property, mortgage term and lender criteria. A calculator can give a rough estimate, but it is not the same as a lender decision.

What mortgage can I get approved for?

Approval depends on full underwriting, document checks, credit assessment and the property valuation. A decision in principle may help you understand possible borrowing, but it is not a guaranteed mortgage offer.

How can I afford a mortgage more comfortably?

You may be able to improve the position by increasing your deposit, reducing committed debts, choosing a cheaper property, extending the term where suitable, buying with another applicant or waiting until income is more stable. These options are not right for everyone, so check the wider consequences before acting.

Does a student loan affect mortgage affordability?

It can. A student loan is not usually treated like a normal personal loan, but repayments can reduce monthly income. Lenders may take the deduction into account when assessing affordability. You can read more in our guide: does student loan affect mortgage.

Should I borrow the maximum a lender offers?

Not necessarily. The maximum mortgage and the comfortable mortgage can be different. Consider bills, insurance, travel, childcare, savings, repairs and future rate changes before deciding.

Can I get a mortgage if I am self-employed?

Many self-employed people get mortgages, but lenders will need suitable evidence of income and will apply their own criteria. Accounts, tax calculations, tax year overviews, bank statements and business structure can all matter.

Can debts stop me getting a mortgage?

Debts do not always stop a mortgage, but they can reduce affordability. The amount, monthly payment, type of debt and how it has been managed can all affect the assessment.

Is an affordability calculator accurate?

It can be useful for an estimate, but it cannot fully reflect lender criteria, underwriting, credit history, property risk or document issues. Treat it as a starting point, not a mortgage offer.