These guides explain common salary-planning questions in plain English. They are written to support the calculator, not to replace qualified advice.
Why gross salary and take-home pay feel different
A pay rise is usually agreed as a gross annual salary, but the bank-account change depends on income tax, employee National Insurance, pension deductions, student loan repayments and salary sacrifice. That is why the calculator separates total gross income, taxable pay, normal monthly take-home and bonus-month take-home.
The most useful comparison is often the change in normal monthly net pay, with any bonus treated separately. This avoids making a bonus look like it arrives evenly every month when it may actually be paid once a year.
The £100k adjusted net income trap
Adjusted net income matters because the UK personal allowance is gradually withdrawn once income exceeds £100,000. This can create a high effective deduction rate on part of a pay rise. Pension contributions and some salary sacrifice arrangements may reduce adjusted net income, but the right answer depends on personal circumstances.
The advanced scenario page highlights where a target salary may move into this area so users can understand the estimate before making decisions.
Child Benefit and Tax-Free Childcare thresholds
Some family-related thresholds depend on income measures rather than just headline salary. A pay rise, bonus or company benefit can affect eligibility or create a charge. The calculator includes optional family-context warnings so users can spot when a salary scenario may need closer checking.
Salary sacrifice is not automatically a saving
Salary sacrifice can reduce taxable pay and National Insurance, but the benefit type matters. Pension salary sacrifice, cycle to work and EV company car schemes are treated differently. EV schemes can still create Benefit-in-Kind tax, and salary sacrifice must not reduce pay below minimum wage.
Employer pension match can be worth more than cash
Employer pension contributions can materially change the value of a package. A salary offer with a stronger employer match may be more valuable than salary alone suggests, although pension money is not the same as take-home pay today. The calculator includes employer pension contribution fields to make this trade-off more visible.
Bonus month needs a separate view
A bonus paid in one month can make that payslip look very different from a normal month. Showing an average monthly take-home can be misleading, so Help With Salary presents normal month and bonus month estimates separately when a bonus is entered.