Retention Bonus Value Calculator
Annualised value of a retention bonus.
Convert a lump-sum retention bonus into an annual value to compare it fairly against a salary raise or alternative offer.
What this tool does
A retention bonus paid to keep you at a company for a fixed period is worth less than the same amount as a permanent salary rise. Enter the retention bonus, the lock-in period, and your marginal tax rate. The tool shows the net annualised value.
Enter Values
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
A 30,000 retention bonus locked in for two years at a 40% marginal rate is worth 9,000 a year net — roughly equivalent to a one-time 9,000 rise in net pay, but only for those two years. Compare that to a permanent 5,000 raise, which keeps on giving long after the lock-in ends.
What the result means
Net bonus is what arrives after tax. Annualised value is that figure divided by the lock-in years. Use the annualised number to compare against a salary raise or a competing offer with a different structure.
Retention bonuses usually require you to stay the full period or repay pro-rata. If there is a meaningful chance you'll leave early, apply a probability adjustment to the expected value.
Quick example
With gross retention bonus of 30,000 and lock-in period of 2 (plus marginal tax rate of 40%), the result is 9,000.00. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
Which inputs matter most
You enter Gross Retention Bonus, Lock-In Period, and Marginal Tax Rate. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.
What's happening under the hood
Net bonus equals gross times one minus the marginal rate. Annualised value divides net by the lock-in years, giving a like-for-like annual figure to compare with salary raises or other offers. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
Why small rate shifts add up
A 3% pay rise looks modest. Apply it over a 30-year career with modest promotions and the lifetime difference runs to six figures. This calculator makes that invisible compounding visible in a way spreadsheets usually don't.
What this doesn't capture
Tax bands, pension contributions, student-loan deductions, and benefits-in-kind sit outside this calculation. The figure is the headline; your actual position depends on local tax rules and personal circumstances. Pair with a dedicated take-home calculator for the full picture.
Annualised net value of this retention bonus is the figure shown above.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
Net bonus equals gross times one minus the marginal rate. Annualised value divides net by the lock-in years, giving a like-for-like annual figure to compare with salary raises or other offers.
References
Frequently Asked Questions
Retention vs signing bonus?
Is it always better than a raise?
What if I quit early?
Lump sum vs tranches?
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