Combine up to four income sources into one total monthly and annual figure.

A 3,500 salary, 800 of freelance work, 300 dividends, and 400 from rentals sums to 5,000 a month or 60,000 a year. The salary at 70% is the dominant source — losing the job still leaves 1,500 a month from other streams, but the household budget would need serious cuts.

What the result means

Primary is monthly total. Secondary rows break down annual total, largest source percentage, and concentration status. If one source is 70%+ of total, you're mostly relying on one income — same resilience as a single-source household.

Why diversification matters

Single-source households are one redundancy away from a cash crunch. Multiple streams, even small ones, reduce that risk — and some (dividends, rental) continue during a job search. The goal isn't equal splits; it's enough backup income to cover essentials if the main source pauses.

Quick example

With source a monthly of 3,500 and source b monthly of 800 (plus source c monthly of 300 and source d monthly of 400), the result is 5,000.00. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.

Which inputs matter most

You enter Source A Monthly, Source B Monthly, Source C Monthly, and Source D Monthly. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.

What's happening under the hood

Sum of all source incomes. Each source's share is computed as source divided by total. Concentration flagged when any single source exceeds 70% of total — a rule-of-thumb threshold indicating single-source dependency risk. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.

Why small rate shifts add up

A 3% pay rise looks modest. Apply it over a 30-year career with modest promotions and the lifetime difference runs to six figures. This calculator makes that invisible compounding visible in a way spreadsheets usually don't.

What this doesn't capture

Tax bands, pension contributions, student-loan deductions, and benefits-in-kind sit outside this calculation. The figure is the headline; your actual position depends on local tax rules and personal circumstances. Pair with a dedicated take-home calculator for the full picture.