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Prorated Bonus Calculator

Work out a prorated annual bonus for a partial year: target bonus from salary and bonus %, the share of the bonus period you were eligible (days or full months) and a performance multiplier.

Annual base salary

Target bonus

Bonus period start

Bonus period end

Eligible from (start date)

Performance / company multiplier

Proration by

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How it works

target bonus = base salary × target % · proration factor = days eligible ÷ days in the bonus period (or full months eligible ÷ months in the period) · prorated bonus = target × proration factor × performance multiplier

Annual bonus plans usually pay new hires (and sometimes leavers or people back from unpaid leave) only for the part of the bonus year they were employed. The target bonus — a percentage of base salary — is scaled by the share of the period worked, then by any individual or company performance multiplier. Plans differ on whether they count calendar days or only full months, and on cut-off dates (some exclude people hired in the last quarter), so check your plan document.

Worked example

A $80,000 salary with a 10% target bonus gives an $8,000 full-year target. Starting April 1, 2026 in a calendar-year plan you are eligible for 275 of 365 days, a factor of 75.34%, so the prorated bonus at 100% performance is $6,027.40. Counting full months instead (9 of 12) gives $6,000.00.

Frequently asked questions

How is a prorated bonus calculated?

Multiply the full-year target bonus by the fraction of the bonus period you were eligible, then by the performance multiplier. Joining on April 1 of a calendar-year plan gives about 75% of the target.

Days or months — which proration is used?

Both are common. Day-based proration is the most precise; month-based plans often count only full calendar months, so a start date after the 1st may not count that month. Your bonus plan rules decide.

Do I get a bonus if I leave before the payout date?

Often not: many plans require you to be employed on the payment date, even if you worked most of the year. Some contracts or local laws give a pro rata entitlement — check the plan and your jurisdiction.

What is the performance multiplier?

A factor applied to the target, typically 0–200%, based on your rating and/or company results. 100% pays exactly the prorated target; 120% pays 20% more.

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