FairShare
Salary Proportion Calculator
Welcome to FairShare
Build a fair financial foundation for your home.
Establish proportionate bill splitting based on your relative incomes in just 4 simple steps.
This guide automates your household budgeting. By establishing a contribution ratio, you'll ensure both partners retain a fair share of disposable income, removing financial friction before it starts.
Rapid Overview:
- Set your income-based contribution ratio.
- Estimate property value and regional running costs.
- Review your detailed proportionate split report.
You & Your Finances
Establish your contribution ratio and everyday shared costs.
First, work out your fair income-based split. Then set up your shared lifestyle costs, like groceries and childcare, using the same ratio (or split them equally).
Your Income
Calculate your contribution ratio based on earnings.
Your combined income determines your individual percentage of the household bills. This ensures shared costs are split fairly relative to each partner's earning power.
Enter your total yearly income before any deductions.
Enter your partner's total yearly income before any deductions.
Committed & Lifestyle Costs
Define your shared living and personal costs.
Establish split rules for groceries and other lifestyle commitments. These are typically more flexible than core utilities but still benefit from a clear agreement.
Food, household supplies, and shared toiletries.
Nursery, childminders, or other regular care costs.
Combined life, health, or pet insurance payments.
Your Home
Define your property, mortgage, and running costs.
Expand each section below to enter your property details, mortgage terms, and monthly utility costs. We've provided regional estimates to help speed things up.
Property Details
Define your home to estimate running costs.
We use your postcode and property size to estimate regional costs for Council Tax and utilities. You can manually override these estimates later.
The estimated market value of the property you're buying or already own.
Used to estimate regional utility and energy costs.
Used for regional water bill estimates.
Mortgage & Equity
Define your financing and upfront costs.
Enter your deposit and mortgage details to calculate monthly repayments. We've also included space for one-off purchase costs to help you plan your initial cash requirements.
You: 50% / Partner: 50%
The annual interest rate for your mortgage.
The number of years you'll take to pay off the mortgage.
Estimated Purchase Costs
Standard residential rate estimate for your region.
Includes conveyancing, searches, and bank fees.
Any arrangement or booking fees paid at completion.
Mortgage Summary
Principal plus total interest over the full term.
Monthly Utilities
Establish rules for baseline running costs.
We've provided regional estimates for your essential bills. Adjust these figures to match your actual commitments, and choose a split rule for each item.
Estimated monthly council tax based on your selected tax band.
Estimated monthly utility cost for gas and electricity.
Average regional monthly water cost based on property size.
Internet, cable, and streaming subscriptions.
Detailed Analysis
This report provides a clear roadmap for your joint finances. Use these figures to plan your property purchase and set up joint account payments with confidence.
1. Initial Upfront Costs
The total cash required to complete the purchase, split by your chosen rule.
Est. Stamp Duty (SDLT): £0
Legal Fees: £0
Mortgage Product Fees: £0
Est. Total Upfront Cash: £0
SDLT (Stamp Duty Land Tax) is a tax paid to HMRC when buying property in England or Northern Ireland. Wales uses LTT (Land Transaction Tax) and Scotland uses LBTT (Land and Buildings Transaction Tax) — both apply different rates to the same purchase.
| Upfront Cost | Total | You | Partner |
|---|---|---|---|
| Cash Deposit | £0 | £0 | £0 |
| Stamp Duty (SDLT) | £0 | £0 | £0 |
| Legal Fees | £0 | £0 | £0 |
| Mortgage Fees | £0 | £0 | £0 |
| Total Upfront | £0 | £0 | £0 |
2. Ongoing Monthly Shares
Ratio is 50 percent You and 50 percent Your Partner.
Total Shared Monthly Budget: £0
Calculation Details
Income & Ratio Workings
£0 + £0 = £0
- You: 0% share
- Your Partner: 0% share
Mortgage & Terms
Property Value: £0
- Deposit: 0% (£0) split by Income Ratio
- Mortgage Required: £0
- Terms: 0% over 0 years
- Purchase Type: Sole Property
- Buyer Status: Standard
- Upfront Fees: £0
- Monthly Repayment: £0
- Total Repayment: £0
Calculation Logic
Each monthly line item was split using either your Income Ratio or 50/50 based on your specific rule choices throughout the form. The mortgage payment is always split by your Income Ratio to ensure long-term fairness.
FairShare — Monthly Cost Breakdown
Prepared for: You & Your Partner
Generated:
Full Cost Breakdown
| Expense | Total | You | Your Partner |
|---|---|---|---|
| Mortgage | £0 | £0 | £0 |
| Council Tax Income Ratio | £0 | £0 | £0 |
| Energy Income Ratio | £0 | £0 | £0 |
| Water Income Ratio | £0 | £0 | £0 |
| Broadband & TV Income Ratio | £0 | £0 | £0 |
| Groceries Income Ratio | £0 | £0 | £0 |
| Childcare Income Ratio | £0 | £0 | £0 |
| Insurance Income Ratio | £0 | £0 | £0 |
| Other Shared Costs Income Ratio | £0 | £0 | £0 |
| Total | £0 | £0 | £0 |
Estimates based on the latest supported UK tax, National Insurance, and student loan rules. For guidance only — consult a financial advisor for personalized advice.