FreeByte

Windfall planning calculator

Tax then allocate a lump sum.

Built and reviewed by Dovanic, Founder and editor, FreeByteLast reviewed: 2026-08-18
$
24%
$
6%

After tax

$91,200

Invested grows to

$151,462

With these inputs, after tax comes to $91,200 over 15 years. Invested grows to works out to $151,462. The result assumes tax rate stays at 24%.

Tax due
$28,800
Left after clearing debt
$63,200

Over time · by years

What moves the number · After tax

Input−10%Now+10%
Windfall$82,080$91,200$100,320
Tax rate$94,080$91,200$88,320

Solve for an input

Whatmakesequal

Compare scenarios

Save this set of inputs, change something, then save again to compare the outcomes side by side.

Tax then allocate a lump sum.

A worked example

Starting figures

Windfall
$120,000
Tax rate
24%
Debt to clear
$28,000
Return on the rest
6%
Years
15

What it returns

After tax
$91,200
Invested grows to
$151,462
Tax due
$28,800
Left after clearing debt
$63,200

How to read the results

With the defaults above, after tax works out at $91,200.

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