How much mortgage can we get on 100k joint income?

On a combined income of £100,000, most lenders will offer between £400,000 and £450,000 using a 4-4.5x combined income multiple. With a 10% deposit, you could buy a property worth £444,000-£500,000. Some lenders offer up to 5-5.5x combined (£500,000-£550,000) for professional couples.

Can we buy a house in London on 100k joint?

Yes — on £100k combined, you can afford a 2-bed flat in most London zones or a small house in zones 4-6. With a 10% deposit, your budget of £450,000-£500,000 opens up options in Croydon, Barking, Walthamstow, and other zone 3-5 areas. For a 3-bed London house, you'd typically need either a larger deposit or one earner above £70k.

What are the monthly payments on 100k joint mortgage?

On a £450,000 mortgage at 4.5% over 30 years, monthly payments would be about £2,280. Combined take-home on £100k (two earners on £50k each) is roughly £6,152/month, so payments are about 37% — very comfortable.

Is it worth buying separately to avoid the tax trap?

The £100k personal allowance taper applies per person, not per couple. So two earners on £50k each avoid it entirely. It only becomes relevant if one partner earns over £100k individually. For stamp duty, only the second property surcharge matters — if either partner already owns property, the 5% surcharge may apply.

How Much Mortgage on a £100k Joint Income — UK Borrowing Guide | PocketWise

How Much Mortgage on a £100k Joint Income — UK Borrowing Guide

How much mortgage can you get on a combined household income of £100,000? Borrowing limits, property options, tax considerations, and strategies for dual-income professional couples.

By PocketWise · 8 April 2026 · 3 min read

A combined household income of £100,000 puts you in the top tier of UK home buyers. With a budget of £450,000-£550,000+, you can buy a family home in almost any region. Here’s the full picture.

How Much Can You Borrow?

Lender Type	Income Multiple	Maximum Mortgage
Most high-street lenders	4-4.5× combined	£400,000-£450,000
Building societies	Up to 5× combined	£500,000
Professional/private bank	5.5× combined	£550,000

With a Deposit

Deposit %	Deposit on £500k Property	Mortgage Needed	Max Purchase
5%	£25,000	£475,000	£421,000-£500,000
10%	£50,000	£450,000	£500,000
15%	£75,000	£425,000	£500,000-£529,000
20%	£100,000	£400,000	£500,000-£563,000

Monthly Payments

Mortgage Amount	Rate	Term	Monthly Payment	% of Combined Take-Home (~£6,152)
£400,000	4.5%	25 years	£2,224	36%
£400,000	4.5%	30 years	£2,027	33%
£450,000	4.5%	25 years	£2,501	41%
£450,000	4.5%	30 years	£2,280	37%
£500,000	4.5%	30 years	£2,534	41%

What Can You Buy on £100k Joint?

Region	Budget (10% deposit)	What You Can Buy
North of England	£450,000-£500,000	Executive detached, premium locations
Midlands	£450,000-£500,000	Large detached, best suburbs
Wales	£450,000-£500,000	Premium detached, Cardiff/Coast
Scotland	£450,000-£500,000	4 bed, central Edinburgh/Stockbridge
Northern Ireland	£450,000-£500,000	Top-end property, any area
South West	£450,000-£500,000	4 bed, Bath/Bristol good areas
South East	£450,000-£500,000	3-4 bed, commuter belt
London (zones 4-6)	£450,000-£500,000	2-3 bed flat or small house
London (zones 2-3)	£450,000-£500,000	2 bed flat

Take-Home at Different Splits

Split	Combined Monthly Take-Home	Notes
£50k + £50k	~£6,152	Both higher-rate, optimal
£60k + £40k	~£6,168	Very similar
£70k + £30k	~£6,227	Slightly more due to second earner’s lower rate
£80k + £20k	~£6,260	More in lower bracket
£100k + £0	~£5,553	Single earner loses out significantly

Two earners take home £600-£700/month more than a single earner at £100k.

Family Budget Breakdown

Monthly Budget (couple, £50k each)	Amount
Combined take-home	£6,152
Mortgage (£450k, 30yr, 4.5%)	-£2,280
Council tax	-£200
Utilities	-£190
Food (family)	-£450
Transport (both)	-£250
Insurance	-£140
Phone / broadband	-£90
Remaining	~£2,552

With Childcare

Scenario	Monthly Childcare	Remaining
No children	£0	£2,552
1 child (nursery)	£1,000-£1,400	£1,152-£1,552
2 children (nursery)	£2,000-£2,800	-£248 to £552
1 school age + 1 nursery	£1,200-£1,700	£852-£1,352

Even on £100k combined, two children in nursery puts pressure on the budget. Many couples at this income level time their property purchase around childcare phases.

Stamp Duty at This Budget

Property Price	Stamp Duty (non-FTB)	Stamp Duty (FTB)
£425,000	£8,750	£0
£450,000	£10,000	£1,250
£475,000	£11,250	£2,500
£500,000	£12,500	£3,750

If either partner already owns a property (even if rented out), the 5% second home surcharge applies on the full price — adding £22,500-£25,000 on a £450,000-£500,000 purchase.

Wealth-Building Strategies at £100k Joint

Overpayment Impact

Monthly Overpayment	Term Cut (£450k, 4.5%)	Interest Saved
£300/month	~5 years	~£72,000
£500/month	~8 years	~£108,000
£750/month	~10 years	~£135,000

Pension Optimisation

Both earners should maximise pension contributions — especially if either earns over £50,270 (higher rate):

£100 contributed via salary sacrifice costs just £58 after higher-rate relief + NI saving
Employer pension matching is effectively free money

ISA Strategy

Combined ISA allowance of £40,000/year (£20k each). After mortgage and pension commitments, use ISAs for medium-term savings.