PRORATED BONUS

Prorated Bonus Calculator

Work out a full-year bonus scaled to the part of the year you actually worked — whether you joined partway through or left mid-year. Calculate the quick way by months, or day-accurate by dates, and see the exact formula with your own numbers.

Prorate a bonus Sample values shown — edit any field to calculate instantly.

Pick Months worked for a quick months ÷ 12 split; pick Exact dates to count day by day for a mid-month start or a leaver date.

Start from a common case:

Prorated bonus

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Enter the bonus and the time you worked to calculate instantly.

This is the gross prorated bonus. Tax withholding on a bonus is separate and is not calculated here.

Calculation method See the exact formula with your numbers

The steps fill in with your own numbers as soon as you enter the bonus and the time worked. Figures shown are illustrative.

Plain language

Your employer's split vs the proportional one

A prorated bonus is the full-year figure scaled to the share of the period you worked — nothing more. If your employer's number looks off, it's usually because they counted whole months while you started mid-month, or used a different bonus period. Switch to Exact dates above to count day by day and compare. For a salary rather than a bonus, use the prorated salary calculator.

▲ Months ÷ 12 vs day-accurate

Months ÷ 12 is the quick split most offer letters describe. Exact dates count the real days worked over the real days in the period, so a start on the 15th or a leaver date lands precisely. The two agree when you worked whole calendar months — they diverge when you didn't.

How it's calculated

In proportion to the time worked

prorated bonus = full bonus × (period worked ÷ full period)

The period worked is months ÷ 12, or — under Exact dates — your days worked over the total days in the bonus period. This is the same proportional split the generic pro rata calculator applies to any partial period; this page just frames it for a bonus.

A worked example

Suppose your full-year target bonus is $10,000 and you started on April 1. By the months method, April through December is 9 of 12 months, so 9 ÷ 12 = 0.75 and the prorated figure is $10,000 × 0.75 = $7,500. Switch to Exact dates and the day count is more precise — April 1 to December 31 is 275 of 365 days, about 0.753, which lands a little higher at roughly $7,534. The two agree closely here because you worked whole months; they diverge most when you join or leave partway through a month. Either way the result is the gross proportional amount — whether it is actually paid still depends on your plan's payout-date and eligibility rules, which the math can't decide for you.

Step by step

How to use the prorated bonus calculator

Start by entering the full-year bonus — the amount for a full year worked, before tax. Then choose how to measure your time: pick Months worked for a quick months ÷ 12 split, or Exact dates to count day by day for a mid-month start or a leaver date. The prorated bonus calculator applies the proportion the moment you type and shows the gross figure with the formula spelled out beneath it.

Use Months worked when your offer letter states the bonus in whole months and you joined or left on a month boundary. Switch to Exact dates whenever a start or last day lands mid-month — the day count is more precise, and the two methods diverge the most when you didn't work whole calendar months. Enter both a period start and end so the calculator knows the full window it is scaling against.

One thing the prorated bonus calculator can't decide for you is whether the bonus is actually owed. It returns the gross amount earned for the time worked; whether that amount is paid still depends on your plan's payout-date and eligibility rules, which are set by employer policy, not by the math. Treat the result as the proportional figure to check against your offer letter or plan document, not as a guarantee of payment.

Questions

Frequently asked

How is a bonus prorated for a partial year?

Multiply the full-year bonus by the share of the period you worked: prorated bonus = full bonus × (period worked ÷ full period). Use months ÷ 12 for a quick figure, or exact dates for a day-accurate split — both are shown with the formula above.

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

Often no. Many US bonus plans require you to be employed on the pay date, which is separate from the days you worked. Commission or contractual plans can differ — check your offer letter or plan document. This shows the time-worked fraction; eligibility is set by employer policy, not the math.

Months or exact dates — which should I use?

Months ÷ 12 is the quick way and matches how many employers state it. Exact dates count day by day, so a mid-month start or a leaver date lands precisely. The two agree when you worked whole months.

Does calendar days vs workdays change my prorated bonus?

Slightly — dividing by roughly 365 vs 260 shifts the result, and there is no universal standard, so the plan decides. Switch between months and exact dates above to see how the basis moves the figure.

Is a prorated bonus taxed differently?

Proration only changes the gross amount, not the tax rule. A bonus is treated as supplemental wages, which are commonly withheld at a flat federal rate or rolled into your regular withholding — but that is withholding, not your final tax. This tool does not calculate tax.

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