Tax Bracket Calculator

The single most misunderstood feature of income tax is that falling into a higher bracket does not mean your whole income is taxed at that rate. Only the income within each band is taxed at that band's rate.

On $60,000 of taxable income, the amount above $47,150 is $12,850 - and only that slice is taxed at 22%. The first $11,600 was never taxed above 10%. The tax on the whole is the sum of each band's slice, not 22% of $60,000.

Note. Earning one dollar more can never reduce your after-tax income. You may cross into a higher band, but only the dollars above the threshold are taxed at the higher rate.

Your marginal rate is what matters for decisions about earning more. Your effective rate is what matters for comparing yourself to headline figures, and for checking a tax estimate against your actual liability.

Quoting the marginal rate as "the tax I pay" overstates the burden substantially - in this example by nearly double.

Brackets apply to taxable income, not gross income. Several layers sit between the two.

1. Gross income - everything you are paid.
2. Adjustments - certain retirement contributions, student loan interest, some business expenses. These reduce income before the next step.
3. Standard or itemised deduction - a flat amount or the total of itemised expenses, subtracted to reach taxable income. Itemising is worthwhile only if it exceeds the standard amount.
4. Taxable income - the figure the brackets actually apply to.
5. Credits - applied after the tax is calculated, and they reduce the bill dollar for dollar rather than reducing income. A $1,000 credit saves $1,000; a $1,000 deduction saves only the marginal rate times $1,000.

Note. Credits are more valuable than deductions of the same size. This is why the headline rate and the bracket boundaries explain only part of what anyone actually pays.

When thresholds are not indexed to inflation, wage rises that merely keep pace with prices push income into higher bands - a real increase in tax without any increase in purchasing power.

• Bracket creep - nominal income rises, thresholds stay, effective rate climbs.
• Fixed-rate savings and wage agreements are eroded the same way.
• Interaction with other thresholds - some credits, allowances and deductions phase out at fixed income levels, creating effective marginal rates well above the headline band, sometimes exceeding 50% in narrow ranges.
• Cliff edges - where a benefit is withdrawn entirely at a threshold rather than tapered, earning slightly more can genuinely reduce total income. These are rarer than people believe but they do exist.

1. Applying one rate to the whole income. This overstates the tax, often heavily, and is the most frequent error.
2. Forgetting the deduction layer. Brackets apply to taxable income after deductions, not to gross pay.
3. Confusing credits with deductions. They operate at different stages and are not interchangeable.
4. Treating last year's rates as current. Bands and thresholds change - confirm the year you are calculating.
5. Ignoring filing status. Single, joint and head-of-household brackets differ, as do the thresholds at which they phase out.
6. Estimating from marginal rate alone. Useful for the next dollar, useless for predicting a total bill.

This calculator produces an estimate from the bands you supply. Verify against the official tables for your jurisdiction and tax year before relying on it for a filing or a large financial decision.