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Calcimator

Bonus Allocation Planner

Optimally split your bonus across emergency savings, debt payoff, retirement, and fun money. See the financial impact of each allocation choice.

About this calculator

This planner takes a bonus, withholds it at your supplemental-income tax rate, sets aside a fun-money slice off the top, and then allocates whatever's left through a fixed priority order: emergency fund gap first, then high-interest debt paydown, then retirement contribution room, each capped at what you said you actually need or owe. Because it fills each bucket completely before moving to the next, a large emergency fund gap or debt balance can consume the entire remaining bonus, leaving nothing for retirement even if you'd rather split it — the priority order is fixed logic, not something you can reweight. The debt interest saved figure is a first-year-only estimate: it multiplies the dollars applied to debt by your stated interest rate, which is a fair proxy for a single billing cycle but doesn't compound the way real revolving debt does over multiple years.

The retirement growth projection is a simplification in a different way — the code always assumes an unadjustable 7% average annual return compounded flatly over exactly 10 years, regardless of your actual investment mix or the number in the retirement gap field, so use it as a directional "is this worth doing" signal rather than a real portfolio projection. The tax withholding percentage should reflect what your employer actually withholds on bonuses (the U.S. federal supplemental flat rate is commonly 22%, but your paycheck may show more once state and FICA are layered on), so treat the after-tax bonus number as an estimate until you see your actual bonus check.

Inputs

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$
$
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Results

After-Tax Bonus

$3,900.00

≈ 4 smartphones

To Emergency Fund$3,000.00
To Debt Payoff$510.00
To Retirement$0.00
To Fun Money$390.00
Debt Interest Saved (Year 1)$112.20
Retirement Growth (10yr)$0.00
How to Use This Calculator
  1. Enter your gross bonus amount and the tax withholding percentage your employer applies.
  2. Input your current emergency fund gap — the calculator prioritizes topping that up first.
  3. Add your high-interest debt balance and rate so the tool can calculate interest saved by paying it down.
  4. Set a retirement contribution gap and the percentage of after-tax bonus you want for discretionary spending.
  5. Review the allocation breakdown to see how much flows to emergency fund, debt, retirement, and fun money.

How the result changes with Bonus Amount

Bonus AmountAfter-Tax Bonus
$2,500.00$1,950.00
$3,750.00$2,925.00
$7,500.00$5,850.00
$12,500.00$9,750.00

What each input means

Bonus Amount
Pre-tax bonus amount you are receiving.
Tax Withholding
Supplemental income withholding rate (federal default is 22%).
Emergency Fund Gap
How much more you need in your emergency fund.
High-Interest Debt Balance
Outstanding balance on high-interest debt (credit cards, etc.).
Debt Interest Rate
Annual interest rate on your high-interest debt.
Retirement Contribution Gap
Room left in your annual retirement contribution limit.
Fun Money Percentage
Percentage of after-tax bonus to set aside for guilt-free spending.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Bonus Amount = 5000, Tax Withholding = 22, Emergency Fund Gap = 3000, High-Interest Debt Balance = 5000 = 7 input(s) provided
  2. Calculate After-Tax Bonus
    After-Tax Bonus
    3900 = $3,900
  3. Calculate To Emergency Fund
    To Emergency Fund
    3000 = $3,000
  4. Calculate To Debt Payoff
    To Debt Payoff
    510 = $510

Engine last updated . Checked against 1 independently-derived test — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.

Frequently Asked Questions

Why might my retirement bucket end up at $0 even though I set a retirement gap?

The engine fills each priority bucket completely before moving to the next: emergency fund first, then high-interest debt, then retirement, in that fixed order. If your emergency fund gap and debt balance together exceed your after-tax bonus (minus the fun-money slice), there's nothing left by the time the retirement step runs, regardless of how large you set the retirement gap field.

How is "Debt Interest Saved (Year 1)" calculated, and why does it say "Year 1"?

It multiplies the dollar amount routed to debt payoff by your entered interest rate as a single year's simple interest — a first-year approximation, not a multi-year compounding projection. Real revolving debt paid down early saves more than this over subsequent years as the balance you'd otherwise still be paying interest on keeps shrinking, but the calculator only estimates the immediate first-year effect.

Does the 7% retirement growth assumption change if I adjust the investment inputs?

No — the code hardcodes a 7% average annual return compounded flatly over exactly 10 years for the "Retirement Growth (10yr)" figure, regardless of your actual investment mix, the size of your retirement gap, or any other input. Treat it as a rough directional signal for whether contributing is worth it, not a personalized portfolio projection.

Why do I need to enter a tax withholding percentage if bonuses are usually taxed automatically?

The calculator only knows your gross bonus amount, so it needs an explicit rate to multiply the bonus by one minus your entered withholding percentage and estimate the after-tax amount that then gets allocated. The U.S. federal supplemental flat rate is commonly 22%, but your actual paycheck may withhold more once state tax and FICA are layered on, so the after-tax figure here is only as accurate as the rate you supply.

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