Donation Deduction Calculator

Work out donation deduction instantly with clear inputs, formula shown and shareable results.

About Donation Deduction Calculator

Charitable relief usually applies a percentage — often 50% or 100% — to a donation that itself cannot exceed a share of adjusted income. Two limits therefore apply in sequence, and the net cost of giving is the donation less the tax saved.

Formula

Donation relief

Qualifying = min(donation, 10% of adjusted income); deduction = qualifying × allowed rate

Worked example

With the default values below, Donation Deduction Calculator returns Deduction Allowed of $50,000.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Donation Mademinimum 0: 100,000
Deduction Rate Allowedone of 50% of donation, 100% of donation: 50% of donation
Adjusted Gross Total Incomeminimum 0: 1,200,000
Marginal Tax Rateaccepts 0–60 %: 30 %

Results

Deduction Allowed: $50,000.00
Qualifying Donation After The Income Cap: $100,000.00
Tax Saved: $15,000.00
Net Cost Of Giving: $85,000.00

Step by step

1Values used
2Donation relief
3Deduction Allowed= 50,000.00
4Qualifying Donation After The Income Cap= 100,000.00
5Tax Saved= 15,000.00
6Net Cost Of Giving= 85,000.00

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Tax figures are estimates based on the rates, caps and thresholds you enter. Real rules differ by jurisdiction and change every year, and personal circumstances alter the outcome. This is not tax or financial advice — confirm with a qualified adviser.
This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Tax figures are estimates based on the rates, caps and thresholds you enter. Real rules differ by jurisdiction and change every year, and personal circumstances alter the outcome. This is not tax or financial advice — confirm with a qualified adviser.

Frequently Asked Questions

Why is there an income-based cap?

To stop deductions being used to eliminate a tax liability entirely through giving.

Are cash donations allowed?

Above a small threshold cash donations are generally disallowed; use a traceable payment method.