Fair mortgage and bills split for couples with different incomes

See a clear monthly total, choose a fair split, and stress test whether it still works if rates rise or one income drops.

UK-focusedNo signupPrivate — no data stored
Inputs
Quick, UK-focused budgeting guidance. No signup.
UK-focusedNo signupPrivate — no data stored
Income
£

Take-home monthly (after tax).

£

Take-home monthly (after tax).

Property & mortgage
£

Deposit % (10 = ten percent). Calculates to £67,500.

Shared costs
£
Included

£

Does your savings rate survive after shared costs?

How it works
Summary
Clear totals, then fairness and resilience.
Mortgage
Mortgage payment
£1,810
Loan amount
£382,500
Deposit
£67,500 (15%)
Total monthly shared cost
Household total
£2,010
Housing (excl. groceries): £2,010 · Groceries included
Stamp Duty (SDLT)
Estimated SDLT
£12,500
Effective rate
2.78%

Splits
Split suggestions: proportional, 50/50, or custom.
Proportional
A £1,173 · B £838
50/50
A £1,005 · B £1,005
Custom
A £1,005 · B £1,005
You pay
£1,173
You have £2,327 left
Partner pays
£838
Partner has £1,662 left
No savings goal set — thresholds use a default buffer (editable in config).
Household leftover
£3,990
Does your savings rate survive? Comfortable
Comfortable ≥ £1,300 · Tight ≥ £650
Stress tests
Works if one income drops or rates rise?
Mortgage / month at +1%
£2,054
Total shared / month
£2,254
Disclaimer
This is budgeting guidance, not financial advice.
Results
£2,010 / month
Comfortable

How it works

A calm, three-step flow designed for confidence — not overwhelm.

1) Enter the numbers
Take-home pay, property price, deposit, mortgage term/rate, and shared costs.
2) Choose a split
Compare proportional, 50/50, or custom (e.g. 66/33) without judgement.
3) Stress test it
See rate rises and one-income scenarios to check resilience.

Why couples use this

Built to reduce anxiety with clear, transparent outputs.

Fairness
“Who pays what?” made explicit — with leftovers shown for both people.
Resilience
“Works if one income drops?” and “what if rates rise?” in one place.
Shared understanding
Share a link to discuss options together, without spreadsheets.

FAQ

Quick answers. Deeper explanations on the FAQ page.

Popular guides to explore next
Mortgage & bills split calculator
Run your numbers live and share a scenario link.
50/50 vs proportional vs custom splits
Choose a split that feels fair and stays sustainable.
Split the mortgage by income (UK)
Proportional splits explained with worked examples.
Proportional bills split calculator guide
Turn take-home pay into a clean monthly split.
66/33 vs 50/50 split for couples
When a custom split beats proportional (and when it doesn’t).
Stamp Duty (SDLT) calculator for couples
Standard vs first-time buyer relief + surcharges.
60/40 bills split guide
A simple compromise between 50/50 and proportional.
70/30 bills split guide
When a fixed split makes sense (and how to validate it).
75/25 bills split guide
For very different incomes: keep leftovers and resilience in view.
Should we split the mortgage 50/50?
A simple decision framework using leftovers and stress tests.
Tip: open a guide in one tab and the calculator in another to compare options quickly.
Fair mortgage and bills split calculator