Donors need an account on mytax.illinois. Gov before applying for a tax credit.Fill in the certificate number, donation amount, contribution due date (expiration date), and region found on your CAC. Invest in Kids offers approved Illinois individual and business taxpayers income tax credits in the amount of 75 percent of their total qualified contributions. 1 Enter the amount you wish to donate to each of the following voluntary charitable donation funds. You may contribute any whole-dollar. When you fill out your tax return this year, you can include all contributions you make to these schools as a deductible charitable contribution. If you have not activated an account with the Illinois Department of. Revenue, you need to request a Letter ID. Step 1. The Tax Credit Scholarship Program (TCS) will help low income students receive a quality.