Austin Friars Financial Services
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Interactive Financial Tools

Planning Ahead & Finding The Right Mortgage

Model your borrowing capacity, Stamp Duty Land Tax liability, and monthly loan repayments prior to consulting with our CeMAP advisers. Accurate modeling provides clarity before committing to property searches.

Current HMRC SDLT Bands
MMR Affordability Logic
Real-Time Amortisation
Interior architectural design of a contemporary London residence
Instant Financial Models Affordability, Stamp Duty & Monthly Quotes
Client Tool Suite

Select a Financial Calculator

Switch between our three financial tools below to evaluate your borrowing power, calculate Stamp Duty liability, or model monthly repayments.

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Estimated Borrowing Capacity

Calculated using UK lending income multiple standards

Standard Borrowing Capacity
£311,750
Max Potential Borrowing (4.85x) £336,762
Estimated Loan-to-Value (LTV) 80%
Estimated Maximum Property Purchase Price £416,762
Lenders stress-test your commitments against regulatory interest thresholds (e.g. 6.5%+). A formal Agreement in Principle from Austin Friars provides verified underwriting assurance.
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HMRC Statutory Thresholds:
  • First-Time Buyers: 0% on first £425,000; 5% on £425,001 to £625,000.
  • Home Movers: 0% up to £250,000; 5% on £250,001 to £925,000; 10% on £925,001 to £1.5m; 12% over £1.5m.
  • Additional / BTL: Standard residential rates plus statutory 3% surcharge across all bands.

Stamp Duty Land Tax (SDLT)

Current statutory rate bands for England & Northern Ireland

Total Stamp Duty Payable
£10,000
Effective Tax Rate 2.22%
Purchase Price £450,000
Tier-by-Tier Breakdown
Up to £250,000 (0%) £0
£250,001 to £450,000 (5%) £10,000
Calculations reflect HMRC residential land rates. Non-UK residents may be subject to an additional 2% SDLT surcharge.
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Monthly Repayment Summary

Capital & Interest Amortisation Schedule

Monthly Repayment
£1,515.22
Total Interest Charged £174,566
Total Repayment Amount £455,565
Austin Friars secures access to exclusive broker-only fixed and tracker rate discounts not visible on public aggregator websites.
Underwriting Guidance

Beyond the Online Calculator: What Lenders Really Look At

While calculators provide an essential preliminary benchmark, modern automated underwriting assesses complex risk factors.

Expenditure & ONS Auditing

Under FCA Mortgage Market Review (MMR) rules, lenders audit three to six months of bank statements. They scrutinize committed expenditure (loans, childcare, student loans) and basic living costs against Office for National Statistics (ONS) statistical benchmarks.

Stress-Testing Margins

Even if your mortgage is on a 4.2% five-year fixed rate, lenders test whether your household budget could sustain mortgage payments if interest rates rose to 6.5% or 7.5% in the future, safeguarding against unexpected defaults.

Credit Profiling & Scoring

Lenders use credit reference agency algorithms (Experian, Equifax, TransUnion) to evaluate your conduct. Electoral roll registration, low credit utilization, and zero missed payments significantly enhance borrowing capacity.

Calculator FAQs

Questions About Calculators & Affordability

UK mortgage affordability relies on the FCA Mortgage Market Review regulations. Lenders evaluate baseline earned income (typically using 4x to 4.85x multipliers), credit commitments, and living expenditure audits, then apply an interest rate 'stress test' (often testing repayment ability at 6% to 7%) to ensure sustainability against future rate spikes.
In England and Northern Ireland, first-time buyers pay 0% Stamp Duty on properties up to £425,000, and 5% on the portion between £425,001 and £625,000. If the purchase price exceeds £625,000, no first-time buyer relief is available, and standard residential rates apply to the entire value.
Adding the arrangement fee (£999–£1,999) to the mortgage prevents upfront cash drain on completion day. However, doing so means you will pay interest on that fee across the entire 25- or 30-year mortgage term, increasing its true cost. Our advisers help you calculate whether paying upfront or rolling it in makes greater financial sense.