Raise Impact Calculator

Your Raise Is Smaller Than You Think

A 10,000 gross raise rarely means 10,000 more in a bank account. Income tax takes a share, and so in most systems do social or payroll contributions, any regional or local tax, and any income-tested credit or allowance that tapers away as earnings rise. What survives depends on the marginal rate applying to that slice of income rather than on the average rate across the whole salary. The arithmetic is direct: at a 25% marginal rate three quarters of a raise survives, and at 40% only three fifths does. This calculator applies whatever rate is entered and reports the result as a monthly figure.

What People Often Overlook

Negotiations usually run on the gross number, because that is what appears on the offer. The figure that lands each month is a different quantity, and the gap between them is not obvious from the gross alone. The tool's loaded example makes the size of it concrete: moving from 65,000 to 72,000 is a 7,000 raise, worth 5,460 a year after a 22% marginal rate, which arrives as 455 a month. A raise described as seven thousand shows up on a payslip as a few hundred, and both descriptions are accurate.

How Your Marginal Rate Fits In

A marginal rate is the rate applied to the last slice of income rather than to all of it. That distinction is what makes a raise calculation different from a salary calculation: the increase stacks on top of existing earnings, so it is taxed at the rate covering that band and above, not at the average across the whole salary. Where a system has progressive bands the average rate sits below the marginal one, because it includes the lower-taxed portions already used up. Entering an average rate here therefore overstates what a raise delivers, and the gap widens the further up the scale the raise lands.

A worked example

With the defaults, a current salary of 65,000 rising to 72,000 at a 22% marginal rate gives a raise of 7,000 a year, a net annual increase of 5,460, and a headline figure of 455 a month. The raise is 10.77% of the current salary. Change only the tax rate and the spread is wide: the same 7,000 raise is worth 583.33 a month at 0%, 455.00 at 22%, 350.00 at 40% and 233.33 at 60%. The monthly figure is the annual net divided by twelve, so it carries no weighting for when in the year the increase takes effect.

What moves the number most

Only the gap between the two salaries drives the headline figure, not their levels. A rise from 65,000 to 72,000 and a rise from 165,000 to 172,000 both produce 455.00 a month at the same rate, because both are 7,000 raises. Where the levels do matter is the Raise Percentage row, which divides the increase by the current salary: 10.77% in the first case and 4.24% in the second. The tax rate is the other half of it, and it moves the result proportionally to what is left after tax rather than to the rate itself: going from 22% to 40% is an 18-point rise in the rate but a 23% fall in the result, from 455.00 to 350.00, because the share kept drops from 78% to 60%.

The formula behind this

The annual gross raise is the new salary less the current one. The annual net increase applies the marginal rate to that difference. The headline figure divides the net annual increase by twelve to give a monthly amount, which is the number the tool reports. Entering a new salary below the current one produces a negative result rather than an error, which is how a reduction reads through the same arithmetic. The percentage row is measured against the current salary in both directions, so a 7,000 fall from 72,000 registers as 9.72% rather than the 10.77% a 7,000 rise from 65,000 registers.

What the headline number hides

Gross pay, net pay and the figure that reaches an account can differ substantially once pension or retirement contributions, employee benefit costs, income-contingent loan repayments and any income-tested allowance are counted, and several of those scale with salary rather than staying flat. This tool isolates one component: the tax applied to the increase itself. A full payroll calculation covers the rest, and the difference between the two figures is usually the sum of those deductions rather than an error in this arithmetic. Comparative wage statistics are reported gross for the same reason, which is why a headline pay figure and a take-home figure are rarely the same number.