Net Income Calculator

Two different things answer to this name

Worth clearing up first, because the phrase is used for two unrelated figures and you may have arrived looking for the other one.

In company accounts, net income means the bottom line of an income statement. Revenue minus every cost, including interest and corporation tax. If that is what you want, the net profit margin calculator works with it.

In personal finance, net income means take-home pay. What lands in your account after tax and deductions.

This tool does the second one. Gross salary, bonuses, tax and the things your employer takes off before paying you.

Six inputs, and a full breakdown showing where each piece went. The arithmetic is simple addition and subtraction. The care is in the order it happens, which is the subject of the two central sections here and which decides whether the answer matches your payslip.

Six fields

1. Gross Salary. Your pay before anything comes off.
2. Tax Rate. The percentage of income tax you expect to pay.
3. Other Deductions. Anything not covered by the specific boxes: union dues, a season ticket loan, a salary advance.
4. Bonuses. Additional pay for the same period.
5. Health Insurance. Your contribution to cover.
6. Retirement Contributions. What goes into a pension or provident fund from your pay.

Press Calculate and you get every line itemised: gross, bonuses, taxable income, tax, each deduction, the total of them, and the net income at the bottom.

Use one consistent period throughout. Annual figures in all six boxes, or monthly in all six. A yearly salary with a monthly pension contribution produces a number that describes nothing.

The order the tool works in

Four steps, and step one is where everything hinges.

1. Taxable income = gross salary + bonuses − health insurance − retirement.
2. Tax = taxable income × tax rate.
3. Total deductions = tax + other deductions + health insurance + retirement.
4. Net income = gross salary + bonuses − total deductions.

Read step one carefully. Your health insurance premium and your retirement contribution come off before the tax is worked out, so the tax is charged on a smaller figure than your gross pay.

That is how most payroll actually works. An occupational pension and an employer health plan are usually taken from pay before income tax, which is why they cost you less than their face value. The box marked other deductions is treated the opposite way, as something taken from pay that has already been taxed.

Those two treatments produce different take-home pay from identical inputs, and the difference is real money. The next section is entirely about it.

A hundred thousand with a bonus

Gross salary 100,000, bonus 10,000, tax rate 25 percent, other deductions 1,000, health insurance 3,000, retirement 8,000.

Notice the third line. Taxable income is 99,000, not the 110,000 you were paid, because the 3,000 of health insurance and the 8,000 of retirement came off first. The tax is charged on the smaller figure.

So 110,000 of pay produces 73,250 in the account. That is 66.59 percent of what you earned, on a headline tax rate of 25 percent.

The gap between those two numbers is the point of doing this at all. People think in terms of their tax rate and are then surprised by their payslip, because tax is only one of four things coming off.

Of the 36,750 that disappeared, 24,750 was tax and 12,000 was everything else. Nearly a third of the total, and none of it appears in a conversation about tax rates.

The one question that changes your answer

Ask your payroll department this: are my pension and health insurance contributions taken before tax or after?

It is worth asking because the two treatments produce different take-home pay from identical inputs.

Pre-tax deductions reduce your taxable income first, so you pay tax on a smaller figure. Occupational pension schemes in many countries work this way, and so do a good number of employer health arrangements. This is what the tool models for the health insurance and retirement boxes.

Post-tax deductions come out of money that has already been taxed. That is how the tool treats the other deductions box, which is where union dues, a season ticket loan or a salary advance belong.

Same numbers as above, under the two treatments:

2,750 of difference, and it has a precise explanation: it is the tax rate applied to the 11,000 of pre-tax deductions. Twenty five percent of 11,000 is 2,750, exactly.

Which gives you a simple adjustment if your scheme runs the other way. If your pension and health contributions are actually taken after tax, work out your own figure by multiplying those contributions by your tax rate and subtracting the result from what this tool gives you.

And it scales with your tax rate, so it matters most to the people paying most:

There is a second reason to know the answer, beyond the arithmetic. A pre-tax pension contribution costs you less than its face value, because part of it is money you would have handed over in tax anyway. On a 40 percent rate, putting 1,000 into a pension reduces your take-home by 600. That changes how the decision to contribute more should feel.

The tax rate box wants one number, and your tax bill is not one number

Almost every income tax system is progressive. Slices of your income fall into bands, each taxed at its own rate, and the rate on the last pound you earned is higher than the rate on the whole.

Those two figures have names and they are easy to confuse.

Your marginal rate is what applies to your next unit of income. It is the number people quote when they say what tax bracket they are in.

Your effective rate is your total tax divided by your total income. It is always lower, because the earlier slices were taxed more gently.

This box wants your effective rate, because it applies whatever you type to your whole income.

Enter your marginal rate and you will overstate the tax and understate your pay, sometimes by a lot. Someone in a 40 percent band might have an effective rate closer to 28 percent once the lower bands and any allowance are accounted for.

The reliable way to get it: take your total tax from last year's payslips or tax return, divide by your total income for the same period, and multiply by a hundred. That number describes you rather than describing a bracket.

One consequence for the bonus box. In a progressive system a bonus is frequently taxed at your marginal rate rather than your average one, because it sits on top of everything else. So a large bonus entered here, at your effective rate, will be treated more gently than reality. For a bonus that pushes you into a higher band, the honest approach is to model the salary and the bonus separately at their own rates.

What is not in the six boxes

The tool has one tax field. Most payslips have several deductions that are not income tax and not in this list.

Social security and payroll contributions. National Insurance in the UK, Social Security and Medicare in the US, provident fund and ESI contributions in India, and their equivalents elsewhere. These are separate from income tax, often several percent of pay, and they are usually the largest thing missing. If they apply to you, put them in the Other Deductions box.

Local and regional taxes. State, provincial or municipal income taxes, where they exist, sit on top of the national rate. Either fold them into the tax rate or add the amount to Other Deductions.

Employer contributions. Anything your employer pays on top of your salary, into a pension or towards insurance, is not deducted from you and does not belong in these boxes. It is real value and it is not part of this calculation.

Non-cash benefits. A company car, subsidised housing, insurance provided in kind. In several countries these are taxable, which raises your tax without raising your pay.

The practical test: hold a real payslip next to the result. Every line on the payslip should be findable in one of the six boxes. Anything that is not, add to Other Deductions, and if the totals then agree, your model is describing your actual pay.

This is an estimate for planning rather than a payroll calculation, and nothing here is tax advice.

Questions people ask

Is this for a company's net income or my take-home pay?

Take-home pay. For a company's bottom line after all costs, interest and tax, the net profit margin calculator works with that figure.

How is it calculated?

Tax is applied to gross salary plus bonuses. Then tax and all the other deductions are subtracted from gross plus bonuses to give net income.

Are my pension contributions treated as pre-tax?

Yes. The health insurance and retirement boxes come off your pay before the tax is worked out, which is how most occupational schemes operate. If your own scheme is taken after tax instead, your real take-home is lower by your tax rate multiplied by the contribution. On 11,000 of contributions at 25 percent, that is 2,750.

Which tax rate should I enter?

Your effective rate, meaning total tax divided by total income, not the rate of the band you are in. Using a marginal rate overstates the tax on your whole income.

Where do social security contributions go?

In the Other Deductions box, since there is no separate field for them. They are separate from income tax and are often the largest deduction after it.

Is my bonus taxed the same as my salary?

Frequently not. A bonus sits on top of your other income, so in a progressive system it is often taxed at your marginal rate rather than your average one. Model a large bonus separately if it pushes you into a higher band.

Should I use annual or monthly figures?

Either, as long as all six boxes use the same period. Mixing an annual salary with a monthly deduction gives a meaningless answer.

Why does this not match my payslip exactly?

Usually social security contributions, local taxes, or pre-tax treatment of pension and health deductions. Hold a real payslip alongside the result and account for every line, adding anything missing to Other Deductions.

References

The treatment of wages, supplemental wages such as bonuses, and the deductions an employer withholds from pay follows the Internal Revenue Service's employer guidance, which sets out how income tax withholding is figured and how supplemental wages may be treated differently from regular wages. The distinction between a marginal rate applying to the next unit of income and an effective rate applying to total income, and the treatment of pre-tax contributions reducing taxable wages, follow the same guidance. The corporate meaning of net income, as the bottom line after all costs, interest and income tax expense, is prescribed for the income statements of registrants by Regulation S-X, Rule 5-03.

1. Internal Revenue Service, Publication 15 (Circular E), Employer's Tax Guide. https://www.irs.gov/publications/p15
2. Internal Revenue Service, Publication 15-A, Employer's Supplemental Tax Guide. https://www.irs.gov/publications/p15a
3. United States Securities and Exchange Commission, Regulation S-X, Rule 5-03: Statements of Comprehensive Income (17 CFR 210.5-03). Text quoted in SEC staff correspondence at https://www.sec.gov/Archives/edgar/data/0001019361/000101936112000010/filename1.txt