🏠 Mortgage Calculator for First-Time Buyers
Calculate your monthly repayment, total interest, and full amortisation schedule for any home loan.
First-time buyer (FTB) schemes vary by country. UK FTBs use the Lifetime ISA, Mortgage Guarantee Scheme, Shared Ownership, and FTB Stamp Duty relief. US FTBs use FHA (3.5% down), VA (0% for veterans), USDA rural loans, and state-level Down Payment Assistance. South Africa offers the FLISP subsidy.
First-time buyers in 2026 face the most challenging affordability environment in 30+ years on both sides of the Atlantic. UK house-price-to-income ratios are at 8-10x in London and 5-6x nationally; US home prices have risen 45%+ since 2020 against mortgage rates near 6-7%. This calculator models the FTB-specific schemes that actually move the affordability needle. UK first-time buyers wanting the true monthly cost figure — P&I plus SDLT (with FTB relief applied), council tax, and buildings insurance — should also run our mortgage calculator with tax and insurance. First-time buyers whose credit profile carries CCJs, defaults, or missed payments should model the rate uplift specialist lenders charge on our UK bad-credit mortgage calculator before applying.
UK first-time buyer toolkit: - Lifetime ISA (LISA): contribute up to £4,000/year between ages 18-50, receive a 25% government bonus (maximum £1,000/year), usable for a first home up to £450,000 or for retirement at 60 - FTB Stamp Duty relief (England/NI): no SDLT up to £300,000; 5% on the portion £300,001-£500,000; no FTB relief on properties above £500,000 (the temporary 2022-2025 £425k/£625k thresholds reverted on 1 April 2025). Scotland (LBTT) and Wales (LTT) have separate FTB structures - Shared Ownership: buy 25-75% of a property, pay rent on the rest, staircase ownership up over time - Mortgage Guarantee Scheme: government guarantees the 91-95% LTV slice to encourage 5% deposit lending. Authoritative source: gov.uk Help to Buy and Lifetime ISA pages, plus HMRC SDLT guidance
US first-time buyer toolkit: - FHA Loan: 3.5% down with 580+ FICO; 10% down with 500-579 FICO. Mortgage insurance for the life of the loan if down payment is under 10% - VA Loan: 0% down for eligible veterans/active duty/spouses, no PMI, capped funding fee - USDA Rural Development: 0% down in designated rural areas, income limits apply - State and local DPA: most states offer 3-5% down payment assistance grants or forgivable second loans - HomeReady (Fannie) / Home Possible (Freddie): 3% down conventional with reduced PMI for lower-income borrowers - Authoritative sources: HUD homebuyer resources and the CFPB's loan-program comparison guides
South Africa first-time buyer toolkit: - Finance Linked Individual Subsidy Programme (FLISP): government subsidy for qualifying first-time buyers earning R3,501-R22,000/month, paid as either a deposit contribution or a loan reduction - No transfer duty on properties below R1.1M (current SARS threshold) - Authoritative source: Department of Human Settlements FLISP guidance
The calculator models each regime in parallel, surfacing total cost of borrowing across the holding period rather than headline monthly payment alone — because FHA's life-of-loan MIP and LISA's compounded bonus play out over decades, not months.
Calculate your monthly repayment, total interest, and full amortisation schedule for any home loan.
How is a mortgage payment calculated?
A standard fixed-rate mortgage uses the amortising annuity formula: M = P × r(1+r)n / ((1+r)n−1), where P is the loan amount, r is the monthly interest rate (annual ÷ 12), and n is the total number of monthly payments. Most of each early payment goes to interest; the principal share grows over time.
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How to use this calculator
Takes about 3 minutes.
- Enter the home price and your down payment
- Set the annual interest rate and the loan term in years
- Optionally add monthly property tax and home insurance to get a full PITI figure
- Click Calculate to see your monthly payment, total interest, and full amortisation schedule
- Adjust the down payment or term and recalculate to compare scenarios
- Compare a 5% vs 10% vs 15% deposit on the same property to surface the LTV-tier rate trade-off
Try these scenarios
Tap a scenario to load it into the calculator above.
Methodology & Sources
This calculator implements the standard mortgage amortisation formula: M = P × [r(1+r)^n] / [(1+r)^n − 1]. Region-specific tax and rate defaults are sourced directly from each country's primary government source and reviewed against the publication date below.
- USA: IRS — federal income tax brackets and contribution limits.
- UK: GOV.UK — HMRC personal allowance, National Insurance, and dividend rates.
- SA: SARS — personal income tax brackets and tax rebates.
Last verified: May 2026.
Key concepts
Principal vs. interest. Every mortgage payment is split between principal (reducing what you owe) and interest (the lender's fee). Early in a 30-year loan, most of each payment is interest; only after 15+ years does principal start dominating — this is the amortisation curve.
LTV (loan-to-value). Your loan divided by the home's price. A 20% deposit gives an 80% LTV. In the US, an LTV above 80% triggers Private Mortgage Insurance (PMI); in the UK, lower LTV typically unlocks better rates (FCA rules).
Fixed vs. variable rate. A fixed rate locks your payment for the fix period (typically 2, 5, or 10 years in the UK; whole-term in the US). A variable rate moves with central-bank policy — cheaper when rates fall, painful when they rise.
PITI and escrow. In the US, lenders often bundle property tax and homeowner's insurance into your monthly payment via an escrow account — Principal, Interest, Taxes, Insurance. The calculator's optional fields add these for a true monthly housing cost.
Total interest paid. Over a 30-year, $400k loan at 7%, you may pay more in interest than the home cost. Shortening to 15 years roughly halves total interest at the cost of a higher monthly payment.
UK first-time buyer schemes in 2026 — what's actually open
The UK first-time buyer scheme landscape changed materially between 2023 and 2026 and most online guidance hasn't caught up. Here's the current state in 2026 of every government-backed FTB scheme, in order of borrower relevance.
Help to Buy Equity Loan — closed. The scheme ran in England from 2013, lent first-time buyers up to 20% (40% in London) of the purchase price of a new-build interest-free for the first five years, and closed to new applications on 31 October 2022 with completions ending in March 2023. The Welsh equivalent (Help to Buy Wales) closed in March 2025. There is no government-backed equity-loan replacement on offer in 2026 for FTBs in England — the policy gap is filled by Shared Ownership and the Mortgage Guarantee Scheme, both described below.
Mortgage Guarantee Scheme — extended through June 2025, then made permanent in spring 2025. The Mortgage Guarantee Scheme was launched in April 2021 as a Covid-recovery measure to encourage lenders back into the 95% LTV market after the Covid-era credit retrenchment. The Treasury guarantees the 91-95% LTV slice of the loan against borrower default for seven years, which removes the lender's tail-risk exposure on high-LTV lending and allows mainstream banks to offer 95% products at competitive pricing. The scheme was due to close in June 2025, was extended in the March 2025 Budget, and was made a permanent fixture of the UK mortgage market under a Treasury announcement in spring 2025. In practice this means UK FTBs in 2026 can access 95% LTV products from the major high-street lenders (Halifax, Nationwide, Santander, Lloyds, NatWest, Barclays) at rates typically 50-100 basis points above the equivalent 75% LTV product.
Shared Ownership — the 2021 model. Shared Ownership has run since the late 1970s but the relevant policy framework is the 'New Model Shared Ownership' that became the default for new builds funded through Homes England's 2021-26 Affordable Homes Programme. Under the new model, FTBs can buy a 10-75% share of a property and pay rent on the remainder, with the rent capped at 2.75% of the unsold equity per year. Two material 2021 changes vs the older scheme: (1) initial share minimum is 10% (down from 25%), making the cash-at-completion step achievable on smaller deposits; (2) staircasing — buying additional shares from the housing association — can be done in 1% tranches in the first 15 years of ownership (down from 10% minimum tranches), so the borrower can buy out the housing association gradually rather than in large chunks.
First Homes Scheme. First Homes is an England-only scheme that requires participating local authorities to offer 30-50% discounts off market value on a fraction of new-build housing reserved for local first-time buyers, key workers, and households below £80,000/year (£90,000/year in London). The discount is preserved on resale — every subsequent buyer also gets the same percentage discount off the then-market value. The scheme is administratively patchy because it depends on each local authority allocating Section 106 contributions to First Homes; coverage is strongest in areas with active new-build pipelines and weakest in established town centres. Check your target local authority's housing strategy document before assuming First Homes is available in your area.
Deposit Unlock. Deposit Unlock is a private-sector insurance scheme for new-build properties, launched in 2021 by the Home Builders Federation in partnership with selected lenders. It works similarly to the Mortgage Guarantee Scheme but is funded by the housebuilders' insurance contributions rather than the Treasury, and is available to existing homeowners as well as first-time buyers. Around 30 lenders participate in 2026, mostly the medium-sized building societies (Nationwide, Skipton, Newcastle, Hinckley & Rugby, Bath, others). Most useful for FTBs buying a new-build at 90-95% LTV where the developer offers it as part of the package.
Lifetime ISA, Right to Buy, and Help to Buy ISA legacy holders. Lifetime ISA (covered above) remains the most cash-impactful saving scheme for under-40 FTBs. Right to Buy applies only to council tenants buying their existing rented property and is unrelated to FTB schemes. Help to Buy ISA (the older saving scheme that pre-dated LISA) closed to new accounts on 30 November 2019, but existing holders can continue to contribute until November 2029 and claim the 25% bonus on first-home purchases up to £250,000 (or £450,000 in London). If you hold both a Help to Buy ISA and a LISA, you can only claim the government bonus from one — most holders close the H2B ISA in favour of LISA's higher annual cap.
Affordability maths — beyond the 4.5x rule of thumb
The headline 'how much can I borrow' figure is set by two regulatory layers: the FCA's principles-based affordability rules under the Mortgage Conduct of Business (MCOB) sourcebook, and the Bank of England's Prudential Regulation Authority (PRA) flow limit on loans at or above 4.5x income. These two interact in ways most online affordability calculators get wrong.
The 4.5x flow limit. The PRA's 2014 financial-stability rule does NOT cap individual mortgages at 4.5x income. It caps the FLOW of high-LTI lending — lenders are restricted to writing no more than 15% of their new lending book at 4.5x income or above. In practice, every mainstream lender stays well within the 15% threshold by treating 4.5x as their default cap for the median borrower and reserving the over-4.5x capacity for either higher earners (typically £75k+ sole or £100k+ joint) or for the FCA-permitted enhanced affordability cases. For most FTBs at median income, 4.5x is the binding constraint. A £40,000 joint income produces a 4.5x cap of £180,000.
The FCA stress test. Under MCOB the lender must assess affordability under both the product rate and a stress rate that reflects the rate the borrower would face if they failed to remortgage at the end of the initial fixed period. The Bank of England's previous prescriptive 'SVR + 3%' floor was withdrawn in August 2022; lenders now apply principles-based stress assumptions, typically the product rate + 1 to + 3 percentage points. For a £40,000 joint income with a £180,000 borrow at a 4.5% product, the lender stress-tests at 7.5-8.5%, which produces a stressed monthly principal-and-interest payment of around £1,449 vs the product-rate payment of £1,001. The stressed payment as a share of gross monthly income (£3,333) is 43.5% — well above the 35-40% lender comfort threshold, which is why a £40k joint income typically borrows below the 4.5x cap once stress is applied.
MMR — what lenders actually look at beyond income. The Mortgage Market Review took effect in April 2014 and replaced the old self-certification 'income multiple' approach with a forensic affordability assessment. Lenders now look at gross income, but apply a series of deductions to arrive at residual income (the cash that's actually available to service a mortgage payment): existing credit commitments (credit cards, personal loans, car PCP), childcare costs, regular monthly outgoings (utilities, broadband, gym, subscriptions), council tax, insurances, and any committed expenditure visible on the last 3-6 months of bank statements. A common surprise for FTBs is how much PCP car finance compresses borrowing capacity. A £400/month PCP on the household balance reduces a £40k joint borrower's affordability by approximately £21,600 — a serious enough hit that many brokers advise FTBs to settle the PCP balance before the mortgage application if cash allows.
Joint Borrower Sole Proprietor (JBSP) — the parent-income trick. JBSP is a niche but increasingly common FTB structure where one or two parents are added to the mortgage agreement (their income counts toward affordability) but only the child holds the property's legal title at the Land Registry. Two reasons this matters. First, the parent does not become a 'second-home owner' for SDLT purposes — there's no 5pp second-home surcharge to pay, because the parent has no beneficial interest in the property. Second, when the parent's situation changes (retirement, divorce, death) the property doesn't form part of any inheritance dispute because legally it's only ever been the child's. The 2026 JBSP market is offered by around 15 specialist and mid-tier lenders (Skipton, Hinckley & Rugby, Vernon, Tipton, Penrith, and several smaller building societies); rates typically sit 10-30 basis points above the headline 90% LTV product, and lenders cap the parent's age at retirement (usually 75-80) to ensure the income is reliable for the loan duration. JBSP is most useful when the child has saved a 5-10% deposit but their solo income falls just below the lender's stress test — parental income brings the affordability over the threshold without the legal complexity of joint tenancy.
The deposit-vs-rate trade-off — how much extra deposit is worth saving
UK lenders price LTV bands in discrete tiers, with rate uplifts concentrated at the 75% / 85% / 90% / 95% boundaries. Saving an extra 5% deposit is therefore worth significantly more than its proportional effect on loan principal would suggest, because crossing an LTV boundary unlocks a better rate tier. In 2026, the typical rate uplifts for a mainstream UK 5-year fixed (with a 5.0% reference rate at 85% LTV) are roughly:
- 60% LTV: reference − 0.6 percentage points (best buys)
- 75% LTV: reference − 0.3 pp
- 85% LTV: reference (5.0% baseline)
- 90% LTV: reference + 0.2 pp
- 95% LTV: reference + 0.5 pp
For a £200,000 property over 25 years, the full LTV-tier ladder produces these outcomes:
- 95% LTV (5% deposit £10,000), loan £190,000 at 5.5%: monthly £1,166.77, total 25-year cost £350,030
- 90% LTV (10% deposit £20,000), loan £180,000 at 5.2%: monthly £1,073.34, total 25-year cost £322,003
- 85% LTV (15% deposit £30,000), loan £170,000 at 5.0%: monthly £993.80, total 25-year cost £298,141
- 75% LTV (25% deposit £50,000), loan £150,000 at 4.7%: monthly £850.87, total 25-year cost £255,260
- 60% LTV (40% deposit £80,000), loan £120,000 at 4.4%: monthly £660.21, total 25-year cost £198,062
The 95%→90% step alone — saving an extra £10,000 of deposit — drops the monthly payment by £93 and saves £28,027 of interest over the full 25-year term. Stretching from 95% to 85% — an extra £20,000 of deposit — drops the monthly payment by £172.97 and saves £51,889 over the term. For an FTB sitting at 7-8% LTV, the marginal £2,000-£3,000 of deposit that crosses the 95% threshold and lands in the 90% product is the highest-return savings target before completion. Beyond 75% LTV the marginal rate reduction per additional 5% of deposit is smaller (10-20 basis points) and the trade-off shifts toward keeping the cash in an emergency fund rather than the deposit.
The calculator's deposit input lets you sweep across these scenarios. Run it once at your target deposit, then again at the next LTV boundary, and compare both the monthly payment and the total-cost-of-loan delta over 25 years before deciding how much to save.
What FTBs actually spend at completion — beyond deposit and SDLT
The deposit and SDLT are the headline cash items at completion, but the additional 'frictional' costs of buying a UK home routinely run £2,000-£8,000 and are the most under-budgeted line on the FTB cash plan. The 2026 going rates:
- Conveyancing (solicitor fees): £800-£1,500 for a typical freehold purchase, £1,200-£2,000 for leasehold (more documents to review). Search fees (local authority, drainage, environmental, chancel) add £200-£400. Bank transfer and registration fees add £100-£200.
- Survey: RICS HomeBuyer Report £400-£800; full Building Survey (recommended for pre-1900 or non-standard construction) £500-£1,200; basic Mortgage Valuation £200-£400 (lender-required, not buyer-protective, often free on a product offer).
- Mortgage broker fee: £0 (lender-paid via procuration fee only) to £1,500 (typical for adverse-credit or complex cases). Most mainstream FTB cases run £300-£999.
- Mortgage product / arrangement fee: £0-£2,000. The lender presents this as a choice — pay the fee for a lower rate or take the no-fee product at a higher rate. Whether to pay depends on loan size; the broker should run the maths both ways.
- Removals: £400-£1,500 depending on volume and distance. Many FTBs DIY a van hire for £100-£200, which is reasonable for a flat or 1-bed move.
Cumulative frictional costs land at £1,600 on the absolute floor (no-broker-fee, lender-paid valuation, modest removal, basic HomeBuyer Report) and £7,700 at the top of the range (full Building Survey, paid-product-fee mortgage, broker fee, professional removal). Most FTB budgets land in the £3,500-£5,500 mid-range. Budget for this separately from the deposit + SDLT line, and keep it in cash — these costs are paid on completion day, not financed into the mortgage.
For underlying rules and current rates, HMRC's SDLT guidance on gov.uk, the FCA's MCOB handbook, the Bank of England's Money and Credit statistical release, and the Homes England Shared Ownership and First Homes pages on gov.uk are the authoritative public references.
Frequently Asked Questions
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