Mortgage Application Checklist
When you apply for a mortgage, lenders ask for documents covering your identity, income, address, and deposit. Exact requirements vary slightly by employment type and lender. Preparing these in advance, ideally months before applying, speeds up approval and helps our Slough team submit your application faster.
This mortgage application checklist, put together by our Slough mortgage brokers, covers what first-time buyers need to prepare, organised by timeline, from months before applying through to final submission.
The Full Checklist at a Glance
Everything below is covered in more detail further down the page. Use this as your working list; tick items off as you complete them.
Months before applying
Three months before applying
One month before applying
Document checklist (all applicants)
If employed
If self-employed
Who This Checklist Is For
This checklist is for first-time buyers in Slough and the surrounding area preparing for a mortgage application, whether employed or self-employed. If you’re refinancing an existing mortgage rather than buying your first home, the document requirements differ.
Months Before You Apply: What to Prepare Early
The two priorities that take longest to improve are your deposit and your credit report, so both are worth starting on months before you plan to apply.
Saving Your Deposit
Most lenders require a minimum deposit of 5% of the property price, though 10% or more typically opens up a wider range of products and better rates. If you’re saving specifically for a first home, a Lifetime ISA (LISA) lets you save up to £4,000 a year with a 25% government bonus added on top, up to £1,000 a year, provided the property costs £450,000 or less. It’s one of the more underused tools available to first-time buyers, since the bonus is effectively free money toward your deposit. For a full breakdown of deposit sizes and how they affect your mortgage options, see our Deposit Guide.
Checking and Improving Your Credit Report
Three credit reference agencies hold your credit data in the UK: Experian, Equifax, and TransUnion, confirmed by MoneyHelper, the UK government-backed money guidance service. Lenders don’t all check the same agency, and your file can look different at each one, so checking your report early gives you time to fix issues before a lender sees them.
Concrete steps that improve your credit position before applying:
- Register on the electoral roll at your current address, since lenders use this to confirm your identity and address history.
- Pay down unsecured debt where you can, particularly credit card balances, since these reduce the income a lender treats as available for a mortgage.
- Make sure household bills are paid on time and your address information is consistent across your accounts, since discrepancies here are a common cause of delay.
- Review unused credit accounts and discuss any planned changes with your broker, since the right move depends on your overall credit profile rather than a single rule.
For a full breakdown of how specific credit issues affect your mortgage options, see our Credit Score Guide.
Why this matters more than people expect: a missed phone contract payment from three years ago, a joint account with an ex-partner you forgot to close, or simply never having registered on the electoral roll at your current address can each show up as a red flag at exactly the point a lender is deciding how much to offer, or whether to offer at all. None of these are usually deal-breakers on their own, but finding them the week you apply, rather than months earlier, leaves no time to fix them before a lender sees your file.
Three Months Before You Apply
By three months out, focus on practical checks: identification documents valid and in date, bank accounts tidied, and online or app banking set up.
One Month Before You Apply
One month out is when to speak to a Slough-based broker, confirm your budget for fees, including Stamp Duty if applicable, and decide between a fixed-rate or tracker mortgage.
This is also the point to firm up your numbers: what your solicitor and survey will cost, what mortgage arrangement fees apply to the products you’re considering, and whether Stamp Duty affects your purchase. See our Stamp Duty Guide and Mortgage Fees guide for the specifics, or speak with our First-Time Buyer Mortgages Slough team to go through your own figures.
What Documents Do You Need for a Mortgage Application?
Lenders generally ask for five categories of document: proof of identity, proof of address, proof of income, bank statements, and proof of deposit.
Proof of Identity
Proof of Address
Proof of Deposit
Existing Financial Commitments
What Documents Do You Need If You’re Employed?
Most lenders ask for your last 3 payslips and your latest P60, plus employer details covering the last 3 years.
What Documents Do You Need If You’re Self-Employed?
Most lenders ask for the last 2 years of accounts or SA302 tax calculations, accompanied by HMRC Tax Year Overviews.
For the full breakdown of documents and evidence self-employed borrowers need, see our Self-Employed Borrowers guide.
What Slough First-Time Buyers Should Budget For in 2026
According to the Office for National Statistics and HM Land Registry, first-time buyers in Slough paid an average of £299,000 in May 2026 (provisional), against a South East average of £477,000. That figure sits just under the £300,000 Stamp Duty nil-rate threshold for first-time buyers, so a typical Slough first-time buyer purchase currently attracts little or no Stamp Duty, though this changes quickly for anything priced above that line; see our Stamp Duty Guide for the exact rates.
Property type affects this significantly. The same ONS data shows flats in Slough averaged £214,000, against £657,000 for detached houses, so the realistic document and deposit planning for a first flat looks very different from planning for a first house locally. A buyer targeting a flat at the lower end of that range needs proportionately less deposit and less proof-of-deposit paperwork than a buyer stretching toward a detached home, even though the document types required are the same.
If Shared Ownership or First Homes is part of your plan, availability in Slough changes month to month as developments sell out; see our Local Schemes in Slough guide for what’s genuinely open right now rather than relying on national scheme pages that don’t reflect local stock.
Situations That May Require Extra Documents
Certain circumstances lead lenders to ask for evidence beyond the standard list, so it’s worth knowing in advance if any of these apply to you.
- Recently changed jobs. Lenders typically want to see your new contract or an employer’s reference, and some prefer to see you past any probation period before lending, so a recent job change can affect timing as well as documentation.
- Bonus, overtime, or commission income. Usually evidenced with additional payslips or a letter from your employer confirming the payment is regular rather than one-off, since lenders discount income they can’t confirm is consistent.
- Newly self-employed. With less than 2 full years of accounts, lenders vary considerably in what they’ll accept, from one year of accounts through to requiring an accountant’s reference alongside your figures; this is one of the areas where comparing across the market matters most.
- Gifted deposit. Requires the signed gifted deposit letter covered above, and some lenders also ask for evidence of where the gifting party’s own funds came from.
- Recent arrival in the UK. Lenders typically want to see your visa or right-to-reside status, and some require a minimum UK residency or credit history period before lending; this varies significantly by lender.
- Adverse credit. Missed payments, defaults, or a County Court Judgment (CCJ) usually need a written explanation, and depending on severity and recency, may narrow your choice of lender rather than rule out a mortgage entirely.
- Benefits income. Some lenders count certain benefits (such as Working Tax Credit or Disability Living Allowance) toward affordability, others don’t; evidence usually means recent award letters or bank statements showing the payments.
- Joint application. Each applicant supplies the full document set individually (ID, address history, income evidence), not a combined or shared set, so joint applications generally mean twice the paperwork rather than a shorter combined list.
If any of these apply to you, it’s worth flagging early rather than discovering the extra requirement partway through your application. A broker reviewing your circumstances upfront can tell you what to gather before you start, rather than after a lender asks for it.
How Many Bank Statements Do You Need for a Mortgage in the UK?
Most UK lenders request the last 3 months of bank statements, though this can extend to 6 months depending on the lender and your circumstances, such as the source of your deposit or self-employment.
Example: a straightforward, employed applicant with a consistent monthly salary deposit and no unexplained large payments would typically be asked for 3 months of statements, covering both their current account and any savings account holding the deposit.
What Do Mortgage Lenders Look for on Bank Statements?
Lenders check for regular income deposits, spending patterns, existing debt repayments, gambling transactions, and any large unexplained deposits that need further explanation.
Regular salary or income deposits confirm your stated income matches what’s actually landing in your account. Spending patterns and existing debt repayments feed into the affordability assessment alongside the figures you’ve declared. Gambling transactions, even modest and infrequent ones, are something underwriters are trained to flag, and frequent or large transactions can affect the outcome. Any large deposit that isn’t clearly your salary, such as a one-off transfer, typically needs a short written explanation and, if it’s part of your deposit, the paperwork to match.
What Are the UK Mortgage Requirements for First-Time Buyers?
A minimum deposit of typically 5%, evidence of stable income, a satisfactory credit history, and confirmation of first-time buyer status where scheme eligibility depends on it.
These four requirements sit underneath everything else in this checklist. The specific documents above exist to prove each one to a lender’s satisfaction, which is why gathering them in the right order, starting with the slow-moving ones like your deposit and credit history, matters more than rushing the paperwork at the last minute.
Meeting the minimum on all four doesn’t guarantee approval at every lender, since each one weighs the same evidence differently. An applicant with a thin credit history but a large deposit might be turned down by one lender’s standard criteria and accepted by another that’s more flexible on credit history for lower loan-to-value applications. This is one of the clearest examples of why comparing across the market, rather than assuming a single lender’s decision reflects your overall eligibility, changes real outcomes for first-time buyers.
What Additional Costs Should Be Budgeted For?
Beyond the deposit itself, budget for:
- Stamp Duty, where applicable, depending on the property price. See our Stamp Duty Guide for current thresholds.
- Solicitor and conveyancing fees, covering the legal work of transferring ownership.
- Survey costs, for an independent assessment of the property’s condition.
- Mortgage arrangement fees, which vary by product. See our Mortgage Fees guide for the breakdown.
- Moving costs, including removals and any immediate repairs.
How Can a Slough Mortgage Broker Help You Prepare?
A Slough-based broker reviews your documents before submission, matches you to lenders whose criteria you’re actually likely to meet, and reduces the risk of a declined application. Because document requirements vary meaningfully by lender, working with a broker also helps you avoid gathering the wrong paperwork twice, submitting a self-employed applicant’s accounts in a format one lender wants only to find a better-suited lender needed something different.
If you want your documents reviewed before you apply, speak with our First-Time Buyer Mortgages Slough team.
