The total bonus amount if you worked the entire period.
Number of days you were employed during the bonus cycle.
Usually 365 days (or 366 for leap years).
Your Estimated Pro Rata Bonus:
How to Calculate a Pro Rata Bonus
A pro rata bonus is a performance or holiday payment that is adjusted to reflect the actual proportion of the bonus period an employee worked. This is most common when an employee starts a new job mid-year, leaves a company before the cycle ends, or moves from full-time to part-time status.
The Pro Rata Bonus Formula
The calculation is relatively straightforward. It involves dividing the time worked by the total time in the period, then multiplying by the target bonus amount:
Pro Rata Bonus = (Full Annual Bonus / Total Days in Year) × Actual Days Worked
Common Scenarios for Pro Rating
New Hires: If a company pays bonuses on a calendar year basis and you join on July 1st, you are typically eligible for 50% of the annual bonus.
Resignations/Terminations: If your contract allows for it, you may receive a portion of your bonus based on how many months you completed before departing.
Unpaid Leave: If you took extended unpaid leave, your employer might deduct those days from your total "eligible" time.
Step-by-Step Example
Imagine you have a target bonus of $10,000. You joined the company on October 1st, and the bonus cycle ends on December 31st.
Identify Total Days Worked: From Oct 1 to Dec 31 is 92 days.
Identify Total Cycle Days: 365 days.
Divide Time: 92 / 365 = 0.252 (approx 25.2%).
Calculate Final Amount: $10,000 × 0.252 = $2,520.55.
Important Considerations
Always check your employment contract. Some companies use a monthly pro rata calculation (e.g., 3/12 months) rather than a daily one. Additionally, some "discretionary" bonuses may not be legally required to be pro-rated unless specifically stated in your offer letter.
function calculateProRataBonus() {
var fullBonus = parseFloat(document.getElementById('fullBonusAmount').value);
var daysWorked = parseFloat(document.getElementById('daysWorked').value);
var totalDays = parseFloat(document.getElementById('totalDaysInYear').value);
var resultBox = document.getElementById('prb-result-box');
var output = document.getElementById('prb-output');
var explanation = document.getElementById('prb-explanation');
if (isNaN(fullBonus) || isNaN(daysWorked) || isNaN(totalDays) || totalDays === 0) {
alert("Please enter valid numerical values for all fields.");
return;
}
if (daysWorked > totalDays) {
alert("Days worked cannot exceed the total days in the cycle.");
return;
}
var proRataAmount = (fullBonus / totalDays) * daysWorked;
var percentage = (daysWorked / totalDays) * 100;
output.innerHTML = "$" + proRataAmount.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
explanation.innerHTML = "This represents " + percentage.toFixed(2) + "% of your full annual target based on working " + daysWorked + " out of " + totalDays + " days.";
resultBox.style.display = 'block';
}